Water Chiller knowledge

冷水机相关知识

The Guide to Choose the Right Aquarium Chiller 2021

In the production work of various industries, the commonly used chillers are air-cooled chillers or water-cooled chillers. These two types of chillers are the most common in the market.

To learn more about how chillers work and If you’re interested in our chiller, request a quote, 

pls sent  your E-mail to info@topwaterchiller.com, or call +(86) 139 2883 9015 .

The 4 Main Components of Water Chillers 2021

In the production work of various industries, the commonly used chillers are air-cooled chillers or water-cooled chillers. These two types of chillers are the most common in the market.

Air-cooled and water-cooled industrial-grade chillers are critical for industrial processes, such as plastics, pharmaceuticals, commercial printing, and transportation manufacturing. Our clients also rely on them for brewing processes, dairy farm operations, and medical equipment processing. 

Both air-cooled and water-cooled chillers work by removing the heat from your processes so that your equipment stays cool, so they can keep running strong. In this post, we’re providing an insider look at the main components of a process chiller and the importance of each one.

If you’ve ever wondered what’s inside a chiller, here are the four main components of both air-cooled and water-cooled process chillers to know about the 4main components of chillers and basic working principles of a water chiller.

1.The First Important Part is Compressor of chiller.

The main engine of chiller cold compressor is screw and centrifugal compressor, and the commercial engine is scroll compressor.

In the refrigeration industry, common compressors can be divided into the following categories.

1)Rotary Compressor

Rotor compressor is a positive-displacement rotary gas compressor. The compression volume is defined by the trochoidally rotating rotor mounted on an eccentric drive shaft with a typical 80 to 85% adiabatic efficiency.

2)Piston Compressor

Piston Compressor is a positive-displacement compressor that uses pistons driven by a crankshaft to deliver gases at high pressure.

3)Screw Compressor

Screw compressor is a type of gas compressor, such as an air compressor, that uses a rotary-type positive-displacement mechanism. These compressors are common in industrial applications and replace more traditional piston compressors where larger volumes of compressed gas are needed, e.g. for large refrigeration cycles such as chillers, or for compressed air systems to operate air-driven tools such as jackhammers and impact wrenches.

4)Magnetic Suspension Centrifugal Compressor

Magnetic suspension centrifugal compressor is discharged from the air conditioner compressor through high temperature and high pressure freon, enters the condenser, releases heat to the copper tube cooling water, condenses into medium temperature and high pressure Freon liquid, and then depressurizes to low temperature and low pressure liquid through the shut-off valve, enters the evaporator, absorbs heat from the frozen water flowing through the copper tube in the evaporator shell, gasifies into low temperature and low pressure gas, and then inhales into the compressor, which is used in the compressor Through this cycle, the purpose of cooling is achieved.

2.The Second Important part is the Evaporator.

Evaporator of industrial chiller

Ordinary, there are 3 kinds of Evaporator we would use: Dry Evaporator / Full liquid Evaporator / Fall Film Evaporator

1)Dry evaporator 

The working principle is the refrigerant flows in the tube and the water flows outside the tube cluster. Generally, the problem of oil accumulation does not exist when the lubricating oil from the shell enters the compressor with the refrigerant.

The dry evaporator is mainly composed of heat transfer tube, stripper, water discharge tube, refrigerant inlet tube, refrigerant outlet tube, refrigerant water inlet tube, refrigerant water outlet tube, left and right end caps and shell.

the Characteristic of dry Evaporator:

1.The heat transfer coefficient is high and the temperature difference is small;

2.The amount of refrigerant filled is less, generally only about 1 / 3 of that of full liquid type;

3.When the temperature is near 0 ℃, the water will not freeze, the heat transfer coefficient is 4.low and the temperature difference at the end is large;

5.Scale is easy to pay on the surface of evaporator copper tube, and is not easy to clean;

2)Full liquid evaporator

The refrigerant flows outside the pipe and the water flows inside the pipe. It is composed of shell, evaporation tube (high efficiency tube), tube sheet, support plate, etc.

the Characteristic of Full Liquid Evaporator:

1.The heat transfer coefficient is high and the temperature difference is small;

2.The water goes through the pipe and is easy to clean;

3.The refrigerant liquid basically fills the tube bundle, and the charge quantity is large;

4.The return oil of full liquid evaporator is difficult and unstable;

5.When the evaporation temperature of refrigeration system is lower than 0 ℃;

6.The water in the tube is easy to freeze and destroy the evaporation tube;

7.The static liquid column of the liquid in the full liquid evaporator increases the saturated evaporation temperature at the bottom.

3)Falling film evaporator

The refrigerant is evenly separated from the distributor, forms a liquid film on the surface of the heat exchange tube, absorbs the heat in the tube and evaporates, and water flows in the tube, which is composed of distributor, shell, evaporation tube (high efficiency tube), tube sheet, support plate, etc.

the Characteristic of Falling Film Evaporator:

1.High heat transfer coefficient and small end temperature difference (better than full liquid, better than dry type);

2.The lubricating oil accumulates at the bottom of the container and is easy to return due to its high concentration;

3.Avoid the liquid column in the full liquid evaporator to increase the saturated evaporation temperature at the bottom;

4.The main pipe phenomenon of falling film is avoided, the heat transfer is more uniform and the efficiency is higher;

5.The water goes through the pipe and is easy to clean;

6.When the evaporation temperature of refrigeration system is lower than 0 ℃, the water in the tube is easy to freeze and destroy the evaporation tube.

3.The Third Main part is Condenser of chiller

It is a part of refrigeration system, belonging to a kind of heat exchanger, which can convert gas or steam into liquid and transfer the heat in the pipe to the air near the pipe in a very fast way. The condenser is a heat releasing device, which transfers the heat absorbed in the evaporator together with the heat converted by the compressor work to the cooling medium. The working process of condenser is an exothermic process, so the temperature of condenser is higher.

It is composed of built-in separator, shell, evaporation tube (high efficiency tube), tube sheet, support plate, subcooler, etc.

According to the different cooling medium, condensers can be divided into three types: water cooling type, air cooling type and evaporation type.

1)Water cooled condenser

Water cooled condenser takes water as cooling medium and takes away condensation heat by the temperature rise of water. The cooling water is generally recycled, but the cooling tower or cool pool should be set in the system. According to its structure, water-cooled condenser can be divided into shell and tube condenser and tube and tube condenser.

a.Vertical shell and tube condenser

The main features are as follows:

1) Because of the large cooling flow and high flow rate, the heat transfer coefficient is high.

2) Vertical installation covers a small area and can be installed outdoors.

3) The cooling water flows directly and the flow rate is large, so the requirement of water quality is not high. Generally, the common water can be used as cooling water.

4) The scale in the pipe is easy to clean, and it is not necessary to stop the refrigeration system.

5) The temperature rise of the cooling water in the vertical condenser is generally only 2-4 ℃, and the logarithmic average temperature difference is generally about 5-6 ℃, so the water consumption is large. And because the equipment is placed in the air, the pipe is easy to be corroded, and the leakage is easy to be found.

b.Horizontal shell and tube condenser

It has the similar shell structure with the vertical condenser, the main difference lies in the horizontal placement of the shell and the multi-channel flow of water. 

Horizontal condenser is widely used in refrigeration system and freon refrigeration system, but its structure is slightly different. According to the horizontal condenser, the cooling tube is smooth seamless tube, while the cooling tube of Freon horizontal condenser is generally low rib copper tube. 

This is due to the low exothermic coefficient of Freon. It is worth noting that some freon refrigeration units generally do not have liquid storage tanks. But only use a few rows of tubes at the bottom of the condenser, which is also used as a liquid storage tank.

c.Tubular condenser

The vapor of the refrigerant enters the cavity between the inner and outer tubes from above, condenses on the outer surface of the inner tube, and the liquid flows down at the bottom of the outer tube in turn, and flows into the liquid reservoir from the lower end. 

The cooling water enters from the lower part of the condenser and flows out from the upper part of the condenser through the inner tubes of each row in turn. This kind of condenser has the advantages of simple structure, easy manufacture, and good heat transfer effect because of single tube condensation and opposite medium flow direction. 

Its disadvantage is that the metal consumption is large, and when the number of longitudinal tubes is large, the lower tube is filled with more liquid, so that the heat transfer area can not be fully utilized. 

In addition, the compactness is poor, the cleaning is difficult, and a large number of connecting elbows are needed. Therefore, this kind of condenser has been rarely used in refrigeration device. Casing condenser is still widely used in small Freon air conditioning units.

d. Air cooled condenser

Air cooled condenser takes air as cooling medium and takes away condensation heat by air temperature rise. This kind of condenser is suitable for the situation of extreme lack of water or water supply, and is commonly used in small freon refrigeration units. According to the different ways of air flow, it can be divided into natural convection and forced convection.

e. Evaporative condenser

The heat transfer of evaporative condenser mainly depends on the evaporation of cooling water in the air to absorb the latent heat of gasification. According to the way of air flow, it can be divided into suction type and pressure type.

The evaporative condenser is composed of cooling pipe group, water supply equipment, fan, water baffle and box. The cooling pipe group is a snake coil group made of seamless pipe bending, which is installed in a rectangular box made of thin steel plate. The two sides or top of the box body are provided with ventilators, and the bottom of the box body is also used as a cooling water circulating pool.

Parallel connection of evaporative condenser and shell and tube condenser:

4.The Forth Important part is Throttling Device

Throttling device of chiller

The main function is to throttle and depressurize, control and regulate the refrigerant flow and superheat.

Double orifice plate: slow adjustment response; almost no adjustment ability; small energy adjustment range; low cost.

Electronic expansion valve: simple structure, small resistance, wide energy regulation, rapid response to energy efficiency regulation, high cost.

Pro tip:  For low-temperature requirements, ask about electronic expansion valves (EEVs) to give you tight superheat control. They work by using a stepper motor that precisely regulates the valve’s position.

Each of these components of industrial-grade process chillers serves a vital role in cooling your equipment. 

To learn more about how chillers work and If you’re interested in our chiller, request a quote, 

pls sent  your E-mail to [email protected], or call +(86) 134 3313 1656 .

plastic injection molding-plastic bottle

Why need a water chiller for injection molding?

Why need to use injection molding chiller to cool the Injection molding machine?

The main applications of molding temperature control machine and water chiller are warm the mold and cold the mold.

Warm the mold-Mold Temperature Controller

Before injection, the mold should be heated to a certain temperature. Then the plastic is not easy to solidify when it is integrated into the mold cavity in the injection molding process.

The problems like insufficient physical strength, delamination, incomplete injection and blocked flow channel are all related to the weakness of warm mold, which is the significance of warm mold.

Cold the mold-Injection Molding Chiller

During injection molding, the mold needs to be cooled after the whole cavity is filled with plastic. The plastic in molten state is rapidly cooled and solidified.

This is the normal definition of plastic molding chilling. But few people know the effect of cooling rate on the physical strength and internal stress of the final product.

In principle, for different injection parts, the injection mold can be cooled via a water chiller in the fastest way. The injection molding machine produced under this way will reach the best state in terms of physical strength and internal stress.

If the cooling time is too long, the physical strength of the injection molded parts will be weakened and the internal stress will be increased. It will lead to deformation of products. The most common problems are injection molded parts with thin thickness and large size such as automobile dashboard, which will cause great trouble to automobile manufacturers.

Set the same amount of raw materials for each injection molding machine. But when the product design requirements are different, the mold temperature control requirements are also different. Some special products have great requirements on internal stress and physical strength. Different mold sections require different temperature curves, which requires multiple mold temperature controller and injection molding chiller.

1HP air-cooled chiller

Why does Laser Equipment need a chiller?Because it need to cool down!

Why does Laser Equipment need a chiller?
Because it needs to cool down!

What would happen: Temperature will increase when the laser equipment working

In the process of laser equipment running for a long time, the laser generator will generate high temperature continuously. If the temperature is too high, it will affect the normal operation of the laser generator, which is easy to be damaged. 

For example, Laser cutting machines in the long-term production process, its laser generator carbon dioxide glass laser tube will gradually heat. This will result in poor cutting effect, seriously the tube will explosion.

How to fixed this high-temperature problem?-Using a water chiller right now

To prolong the service life of the laser, it is necessary to cool the laser exciter by water circulation to ensure its normal operation under constant temperature or set temperature.

How does the water chiller work with the laser equipment?

The water chiller is mainly used to cool the laser generator of the laser equipment. And control the temperature of the laser generator so that the laser generator can work normally for a long time.

The water chiller is a kind of water cooling equipment, which can provide constant temperature, constant current, and constant pressure. The principle of the water chiller is to inject a certain amount of water into the internal water tank of the machine, cool the water through the refrigeration system of the water chiller, and then the water pump inside the machine will inject the low-temperature frozen water into the equipment to be cooled. The frozen water will take away the heat inside the machine, and return the high-temperature hot water to the water tank again for cooling, to achieve the purpose of cooling the equipment Use.

APT Laser Air-cooled Industrial Unit

APT water chiller, which is widely used in laser cutting,laser Laser marking, laser engraving, laser welding, laser inkjet printing, laser etching, etc…

The APT chiller can set its working temperature according to the production requirements of laser equipment to ensure that the cooling circulating water of the laser tube is in controllable temperature. It also has the function of circulating water flow detection, over-temperature alarm, and automatic temperature control.

Apt laser chiller adopts imported compressor, which ensures the chiller to work stably and has good refrigeration effect. It can accurately control the water temperature within ± 0.2 ℃, and the temperature display accuracy is 0.1 ℃.

Apt laser water cooler adopts all stainless steel large flow water pump, stainless steel water tank evaporator, and all stainless steel pipes to eliminate the pollution of water sources. It can ensure the water purity of the laser equipment, which is beneficial to the control of the laser beam and the laser mode is better.

Operation Problems and Countermeasures of Refrigeration Equipment in Winter

Operation problems and Countermeasures of refrigeration equipment in winter

In Winter, when the outdoor temperature is wet and low, and the condensation pressure has a great influence on the performance of the refrigeration system.

When the condensation pressure (or condensation temperature) is high, the compression ratio increases.

photo-1543896870-78e77bd02034

 And the volumetric efficiency of the compressor decreases, resulting in the reduction of refrigeration capacity and the increase of power consumption. The higher the exhaust temperature and the higher the condensation pressure, the greater the adverse effect.

The phenomenon of high condensation pressure mainly occurs in Summer. At this time, the condensation pressure should be reduced as much as possible to ensure the economy and reliability of the system operation.

However, in winter, the condensation pressure of refrigeration equipment may be too low

When the condensing pressure is too low, the pressure difference between the front and back of the expansion valve is too small, and the capacity of the expansion valve is reduced, resulting in the insufficient liquid supply capacity of the system refrigerant, the lack of liquid in the evaporator, and the refrigeration capacity of the system is greatly reduced, and the unit is protected under low pressure. Therefore, it is necessary to control the condensing pressure in a reasonable range, otherwise the refrigeration device will have frequent low-pressure alarm or low suction pressure alarm.

In order to avoid the winter operation risk of the cooling water system, we can start from :the cooling tower equipment, cooling tower operation strategy and the end pipeline setting.

To avoid the winter operation risk through the equipment side anti freezing, cooling tower start-up and shutdown and pipeline optimization design.

1.There are TWO parts of antifreeze in the place of perennial operation or partial operation: 

Spray Water System and Internal Circulating Water System (softened water).

 For the anti freezing problem of spray water system, an electric heater is usually added in the water pan, which is generally started when the spray water is lower than 5 ℃ and stops when the spray water is above 8 ℃. 

The temperature probe transmits the signal to the control cabinet to automatically control the start and stop of the electric heater. The power selection of electric heater depends on circulating water volume and external air temperature.

2.Ethylene glycol solution or electric heating equipment can be added to prevent freezing of internal circulating water system. 

The freezing point temperature of glycol solution should be selected below the local historical minimum temperature. 

For the larger cooling system, we can consider digging a pool to put the spray water into it, which can save the power consumption due to electric heating operation.

Comparison Between Electronic Expansion Valve and Thermal Expansion Valve

Comparison Between Electronic Expansion Valve and Thermal Expansion Valve

Now more and more civil and commercial refrigeration equipment use electronic expansion valve to replace the original thermal expansion valve. The electronic expansion valve and the thermal expansion valve have the same basic use, but different in performance.

1. Adjustment range

At present, the regulating range of thermal expansion valve is generally narrow. The heat pump unit should not only refrigeration, but also heating, and the ambient temperature range of the suitable occasions is from – 15 ℃ to + 43 ℃, and the corresponding refrigerant evaporation temperature will work in the range of – 25 ℃ – 5 ℃. In addition, if there are multiple compressors in the refrigeration circuit, the number of compressors in operation will change accordingly with the change of user load, resulting in dramatic change of refrigerant flow.

Therefore, a single thermal expansion valve is far from competent for the operation of large heat pump units. At present, many large-scale heat pump products are designed with single loop and single compressor, and the expansion valve system with independent refrigeration mode and heating mode is adopted, which will increase the complexity and manufacturing cost of the system. The electronic expansion valve can be adjusted accurately in the range of 15% ~ 100%.

According to the current use effect, a single electronic expansion valve can meet the regulation of heat pump unit under the above conditions. The adjustable range can be set according to the characteristics of different products, which increases the flexibility.

2. Control of superheat

(1) Superheat control point: 

For the thermal expansion valve, generally only the superheat at the evaporator outlet can be controlled. In the semi closed and fully closed compressor system, the control point can be set not only at the evaporator outlet, but also at the compressor suction port, which can control the suction superheat of the compressor to ensure the efficiency of the compressor.

(2) Superheat setting value:

For thermal expansion valve, its superheat setting value is generally set by the manufacturer in the manufacturing process, usually 5 ℃, 6 ℃ or 8 ℃. The superheat degree of the electronic expansion valve can be set manually according to the different characteristics of the product. For example, the superheat of the evaporator outlet is set to 6 ℃, and the superheat of the compressor suction can be set to 15 ℃, which is very flexible.

(3) Stability of superheat control under non-standard operating conditions:

The superheat setting values of thermal expansion valve are all set under standard conditions. However, due to the characteristics of charging working fluid, when the system deviates from the standard working condition, the superheat will deviate from the set value with the change of condensation pressure, which will not only cause the decrease of system efficiency, but also cause the fluctuation of the system. The superheat degree of the electronic expansion valve is set by the controller artificially, and the actual superheat degree of the system is calculated by the parameters of the control point collected by the sensor, so there is no such problem.

(4) Intelligence of system regulation:

The superheat control of thermal expansion valve is based on the state of the current control point, which is determined by the characteristics of working fluid filled. It can not judge the change trend of the system. The control logic of the electronic expansion valve can adopt various intelligent control systems according to the design and manufacturing characteristics of different products. It can not only adjust the current state of the system, but also distinguish the characteristics of the system according to the change rate of superheat degree and other parameters. The corresponding control methods are adopted for different system change trends. Therefore, its response speed and pertinence to system changes are superior to thermal expansion valve.

3. Reaction rate

The thermal expansion valve is driven by taking advantage of the thermal characteristics of the filling working medium, so its opening and closing characteristics are as follows:

(1) The sensitivity of reaction and the speed of opening and closing are slow.

(2) Generally speaking, the opening and closing speed of thermal expansion valve is relatively consistent.

(3) In the process of unit start-up, there is static superheat. The superheat (SH) of thermal expansion valve is composed of static superheat (SS) and opening superheat (OS). Due to the existence of static superheat, there will be a tendency to delay the opening of thermal expansion valve during startup.

The driving mode of the electronic expansion valve is that the controller calculates the parameters collected by the sensor, sends the regulation command to the driving board, and the driving board outputs the electric signal to the electronic expansion valve to drive the action of the electronic expansion valve. It takes only a few seconds for the electronic expansion valve to change from fully closed to fully open. It has fast reaction and action speed, and there is no static superheat phenomenon. Moreover, the opening and closing characteristics and speed can be set manually, which is especially suitable for the use of heat pump units with severe fluctuation of working conditions.

4. Diversity of control functions

In order to prevent compressor overload caused by excessive refrigerant pressure and flow at evaporation side during the initial start-up of the unit, the thermal expansion valve is generally equipped with mop function, that is, the expansion valve can only be opened when the evaporation pressure is lower than the set value. However, compared with the electronic expansion valve, its function is still monotonous.

The structure of the electronic expansion valve can be regarded as the organic combination of throttle mechanism and solenoid valve, and it can be adjusted by the controller. Therefore, according to different product characteristics, it shows the diversity and superiority of its control function under the conditions of unit start-up, load change, defrosting, shutdown and fault protection. For example: the electronic expansion valve to regulate the refrigerant flow can not only control the evaporator, but also can be used to adjust the condenser.

When the evaporation condition allows, if the condensation pressure is too high, the expansion valve can be properly closed to reduce the refrigerant flow in the system and the condenser load, so as to reduce the condensation pressure and realize the efficient and reliable operation of the unit.

Operation Sequence of Water Chiller

Operation Sequence of Water Chiller

1.CHECK LIST BEFORE INPUT POWER

WHEN the power supply and water supply both meet the requirements,then can we input the power:FIRST, press the power button ON, and check :

① LIQUID LEVEL AND OPEN THE PUMP VALVE:

Whether the liquid level of the cold water tank meets the requirements and whether the front and rear valves of the cold water pump have been opened;

② OPEN THE WATER TOWER AND PUMP

Turn on the switch of cooling water tower and cooling water pump, and pay attention to the opening of inlet and outlet valves of cooling water. (Note: air cooled type does not need cooling water tower)

③CHECK THE TURNING DIRECTION

When all the above conditions are met, you can use the inching mode to test whether the direction of cooling water pump, cold water pump, cooling tower fan and condensing fan of air cooling unit is correct, and whether the water transmission and air suction and discharge are normal. If not, they must be eliminated first.

2. PRESS THE CHILLER OPEN BUTTON AND LET IT RUN

Turn on the running switch of the chiller again, and the chilled water pump starts to run. Please note that the inlet and outlet valves of the chilled water must be opened, and the compressor will run automatically after the delay switch. Please check and adjust the required temperature.

3. Startup sequence difference of water-cooled and air-cooled chiller:

① Water cooled chiller unit:

turn on the cooling tower fan and cooling water pump first, and then turn on the chiller

② Air cooled chiller unit:

can be started directly

4. Shutdown sequence:

① Water cooled unit:

turn off the chiller first, then turn off the cooling tower fan and cooling water pump

② Air cooled unit:

It can be shut down directly.

Industrial Water chiller installation

Installation requirements of industrial water chiller

Installation Requirements of Industrial Water Chiller

All the Installation requirements of industrial water chiller you should notice to make sure the chilling unit can run as long as it can.

Industrial chillers can be divided into two categories according to the heat dissipation mode: 1. Water cooling units; 2. Air cooling units.

The water-cooled unit must be connected with the cooling tower and the inlet and outlet pipes of cooling water and chilled water. The cooling tower and cooling pump should be selected according to the refrigeration capacity and compression power, with the inlet pressure ≥ 1.5bar, and the diameter of the inlet and outlet pipe should be consistent with the diameter of the cooling water inlet and outlet pipe.

However, the air-cooled unit only needs to connect the chilled water inlet and outlet pipes and make-up water source. After the power supply is connected, the operation can be carried out. The ventilation should be smooth, and there should be no dust and debris around to avoid being inhaled into the unit.

1.The diameter of the water pipe

The diameter of the water pipe connection port reserved by the unit is standard size. When the remote transmission is adopted, a larger diameter water pipe must be used for connection. In any case, the diameter of the water pipe should not be smaller than the standard diameter of the connection port, otherwise, the pressure alarm will be given and the compressor and water pump will be damaged greatly.

2.Connecting The Water Pipe

When connecting the water pipe, the user should refer to the installation diagram to connect the pipeline, confirm the position of the inlet and outlet pipe, distinguish the cooling water pipe and the chilled water pipe.The wrong connection of the pipe will damage the unit.Only after ensuring the normal connection of the whole system can the system be started up and run.

3.With Connector or Flange

When the water pipe is connected to the unit, it must be connected with a connector or flange, so that it can be easily removed when necessary.

4.Connect a Hose

A section of hose is connected to the outlet and inlet of the water pipe to reduce vibration transmission.

5.Valves and Filter

If permitted, install valves on water pipes to effectively control water flow. It is suggested to install a filter at the water inlet to prevent sediment and debris.

6.Check Leakage Problem

Check the internal and external have leakage problem or not,when the water inlet/outlet  valve of evaporator and condenser is fully opened.

7.Wrap With Insulation Material

The water pipe should be wrapped with enough insulation cotton to protect it from frost on the surface and keep the chilling water temperature.

8.Winter Protection Measures

In winter, when the unit stops operation, the water in the water pump and water pipe may freeze, causing damage to the unit and water pipe. In order to prevent icing, when the unit stops, the water pump can be effectively started. If there is still possibility of icing, all water in the water pipe will be discharged. If drainage is difficult, an anti icing mixture such as ethylene glycol or propanol can be used.

9.By-pass Pipe

When installing the unit, please install the bypass pipe in the chilled water pipeline device. When the chilled water outlet valve is turned down, the bypass pipe valve can be adjusted to relieve the pump pressure and prevent the evaporator from freezing.

10.Check Before Running

When the air-cooled chiller is started up and running, please pay attention to whether the water pump and exhaust fan turn normally before starting up and running.

11.High/Low Pressure

When the unit is running, please pay attention to the pressure display content: water cooled high pressure is (1.2 ~ 1.8MPa), low pressure is (0.3 ~ 0.6MPa); air cooled high pressure is (1.2 ~ 1.9mpa), low pressure is (0.3 ~ 0.6MPa). If the value is too high or too low, it means that the fault is a precursor or improper use. Please check it in time or inform the manufacturer to deal with it. Maintenance in advance is better than repair afterwards.

12.Cooling Water and Scale

To ensure that the condenser is not easy to scale and can be used for a long time, please use softened water (or tap water) as cooling water. If a cooling tower is used, the cooling water should be replaced regularly.

13.Regular Cleanning

The condenser and evaporator of the chiller usually need to be cleaned after a period of use (the cleaning cycle depends on the surrounding environment and water quality).

14.Temperature Setting

It is better to control the outlet water temperature of the unit at 7 ~ 12 ℃. When adjusting the temperature controller, please note that low temperature will cause some protection devices of the unit to fail.

15.Electric Control Elements and Protection Devices

All electric control elements and protection devices of the unit have been strictly tested by the manufacturer. Users are not allowed to change or remove them during inspection and maintenance. Forced operation without protection will cause great damage to the unit.

Characteristics and advantages of different types of chillers

Characteristics and advantages of
different types Water Chillers

1.

Box type water cooling chiller:

 It has compact structure, with water tank and water pump inside. It is suitable for equipment with closed external pipeline. 

The water-cooled model needs to be equipped with cooling water pump and cooling tower before it can be put into use.

2.

Box type air-cooled chiller:

In addition to all the performance of box type, there is no need to add cooling water pump and cooling tower. 

It is easy to install and operate. It is suitable for small flexible production equipment and workshop where cooling tower is installed unconditionally.

3.

Water cooled open type water chiller: 

It is not equipped with chilled water tank and water pump, but can be connected with water pump and water tank as required. 

The volume of water tank and pump head are not limited, which can better meet the needs of different industrial equipment. 

Open structure, easy to clean and maintain.

4.

Water cooled or air-cooled low-temperature chillers:

Antifreeze solution (ethylene glycol or low-temperature brine) should be used as the carrier refrigerant, and the outlet temperature can be below zero. 

It includes three series: high temperature (water outlet temperature: 3 ℃ – 5 ℃), medium temperature (water outlet temperature: – 5 ℃ – 10 ℃), and low temperature (water outlet temperature – 15 ℃), which can meet the low temperature requirements of various equipment and can also be customized according to the special requirements of customers.

5.

Water cooled screw type:

Adopted with shell and tube condenser and shell and tube condenser , which have the characteristics of simple structure, stable heat exchange, long-lasting efficiency and convenient maintenance. 

The unit has reliable safety protection devices, including: high and low voltage protector, exhaust overheat protector, compressor motor overheat protector, overload current protector, antifreeze temperature protector, water flow protector, emergency stop switch, temperature sensitive fusible bolt, safety valve, etc. 

It is recognized as the most ideal structure composition of central refrigeration host.

6.

Corrosion resistant titanium tube type:

Special titanium evaporator can avoid acid liquid corrosion, and can directly freeze electroplating, oxidation liquid, sea water, salt water and other corrosive liquids.

Preparation Before Installation a Water Chiller

Preparation before installation of chiller

Find it hard or complicate to install a water chiller? Don’t know how to pick up a right place to settle your new water chiller?

Actually , you just need to do below steps one by one.Then everything will become very simple.

Let’s do it!

1.
Check the components are complete

Before installation, check whether the components of the unit are complete.

2.
The Right Cooling water tower and Cooling water pump

Select the appropriate cooling tower (air cooling type does not need cooling tower), and the capacity of cooling water pump should match the model. Please install according to the size of the body pipe, do not reduce the size of the cooling pipe, in order to avoid causing high pressure overload, affecting the cooling effect and increasing power consumption.

3.
Correct handling methods

Correct handling method: use stacker, crane and drum. Do not drag the machine by force. Since the equipment has been debugged before leaving the factory, the system has pressure, so strong vibration is not allowed during loading and unloading, handling and installation. It is not allowed to invert, tilt or side set the unit during handling.

4.
The right installation location requested:

The water chiller is an indoor device. If the user needs to place the equipment outdoors, it should be well protected from rain and sun, and should not be directly exposed to the outside.

The installation location should be a place with stable foundation, open surroundings, ventilation, avoiding corrosion and pollution, and convenient for installation and maintenance.

Since the unit itself will generate heat, it is necessary to avoid high temperature area around the unit during installation to meet the effective heat dissipation of the equipment, especially to ensure that the condenser of air-cooled chiller is well ventilated.

Avoid placing high-power inverter, welding machine and other equipment with interference sources near the equipment, and the installation space of the unit shall not be less than the size shown in the figure below. The figure shows the minimum installation space of the unit (unit: mm).

Water-cooled water chiller (Box type or Open type)
Air-cooled water chiller

5.

The unit without caster at the bottom

The unit without caster at the bottom must be placed on the horizontal concrete base, and there must be no less than 3mm thick damping rubber pad between the unit and the concrete base

6.

It is better to install large air-cooled units in outdoor space.

On the other hand, it can reduce heat emission. When placing, please support the bottom of the unit with bracket to make it ventilate smoothly and prevent rusting.

 

 

Note: 

(1) the power load and grounding part shall be constructed in accordance with relevant laws and regulations

(2) The chilled water pipes of newly installed chillers must be covered with insulation layer.

want more details?

Fill in your details and we'll be in touch