The water pump of the chiller is selected according to the demand for the selection of the pump caliber and flow rate of other no specific to go.
Chillers, in the industry is divided into air-cooled chiller and water-cooled chiller two kinds of chiller in the temperature control is divided into low-temperature chiller and room temperature chiller, room temperature temperature is generally controlled in the range of 0 degrees -35 degrees. Low-temperature machine temperature control is generally in the range of 0 degrees - minus 100 degrees or so.
You are talking about the chiller in the cooling water return loop system in the pump calculation?
Selection of the pump is generally centrifugal, so it is a matter of determining its flow and head.
Determination of pump flow:
We can take the chiller as a system for energy balance calculations, the heat into the system: cooling capacity plus motor power, move out of the system heat cooling water with the heat and heat emitted in the environment, skimming the heat to the environment, according to the process requirements (inlet temperature and outlet temperature) can be found back to the circle of the water flow rate, the need for a centrifugal chiller with a cooling water return loop. If there is a centrifugal refrigeration machine and a screw-type refrigerator with a combined maximum cooling capacity of 2637 + 1231 = 3947KW, its motor power: 467 + 256 = 723KW, *** need to move away from the heat generated by the 4670KW (cold), such as the design requirements of the cooling water through the cooling tower from 37 ° C to 32 ° C, then the amount of water to bring out the amount of heat should be: 4670 ÷ 1.163 × 1000 ÷ (37-32) = 803.1m3 / h , (1.163 for the kilowatts and KCal conversion factor), so that should be determined by the flow of water pumps, generally can be considered two pumps to perform, a pump standby mode to facilitate the implementation of the high-temperature period in the not.
The second is the pump head, which should be based on the flow rate of water in the pipeline (pipeline size to determine) and the length of the pipeline, regional resistance (chiller in the condenser (can be found in the manual), the control pieces to calculate the loss of resistance, due to the cooling water is the loop back system, may not consider the high level difference, only need to be added to the cooling tower of the high level difference can be. Pipeline flow rate can generally be taken about 1m/s, you can press: (pressure drop per meter of pipeline MPa/m) i = 0.0000107 × V × V ÷ d ^ 1.3 formula for calculation, where V is the average flow rate (m / s), so that the head of the pump is also determined.
How to choose a computer water-cooled water pumpFirst of all, the optimal temperature of the water cooling is not the lower the better, and secondly, in the whole set of water-cooled system to determine the effectiveness of three important conditions: the thermal conductivity of the thermal conductivity of the material (by the cold head cold row of components such as the material to determine); the thermal conductivity of the surface contact area (by the cold head of the waterway and the thickness of the cold row of the number of decisions); the difference between the temperatures (mainly by the room temperature, the cold row of the number of pumps flow rate to determine). The temperature difference (mainly determined by the room temperature, the number of cold rows, the pump flow). The product of these three conditions is the heat dissipation per unit time of the whole water-cooled system. It can be seen that the size of the pump flow only involves the temperature difference, but the temperature difference is not only determined by the pump flow, in the water-cooled system, your optimal temperature difference that is the temperature difference between the core temperature and the room temperature, in order to achieve this difference, increase the flow of the pump will indeed have a certain amount of enhancement, but for the performance of the whole system is negligible. And in the computer system under the maximum supply voltage of 12V D5DDC has been the best pump, not only quiet, 5M or even 7M head in the flow is also the king of that power. High-power pumps first of all, you have to adjust your supply voltage, and secondly, the increase in flow will lead to an increase in the inner wall pressure of the whole system to reduce the service life and increase the risk of implementation. So high power pumps are not necessary.
Chiller chiller pump overcuts
Euclid refrigeration is pleased to answer your question. Pump overload is generally due to the following reasons: 1, the supply voltage is too high or too low will produce the working condition is not smooth overload. 2, it is possible that the water source is not clean, there are foreign objects stuck pump impeller, resulting in the implementation of the current is too large, triggering the pump protection device, which shows the overload. 3, the pump itself, the reason for the implementation of the time is too long insulated coil heating resistance is too large or decline resulting in poor feedback. 4, the electronic control box inside the AC contactor poor contact or burned. 4, the electrical control box inside the poor contact or burnt out AC contactor, is the pump lack of phase condition implementation. 5, the water pump ratio is not appropriate water pipe too thick or too thin, condenser or evaporator refrigerant tube is too little and too much too thick and too thin and so on will make the pump to perform pressure is too large leading to the implementation of the obstruction and thus triggering the protection device alarm. The above problems can be found one by one checking the results.
How to choose a chillerShenzhen Kaideli cold machine device Co., Ltd. production: chiller (air-cooled chiller, water-cooled chiller), low-temperature freezers, screw chiller units, ring chiller, cooler, mold temperature machine, glass fiber reinforced plastic cooling towers, pipeline away from the pumps, such as the loop water cooling device. Widely used in: plastic machinery, beverage machinery, rubber and plastic, sonic, chemical biology, medical, food, electronics and other related industries.
Introduction to the chiller:
Industrial chiller is widely used in plastics, electronics manufacturing, electroplating, medicine and chemical industry, ultrasonic cooling, printing and other industrial production, which accurately control the temperature required by the modern industrial mechanized production, which greatly improves production efficiency and product quality. Industrial chiller easy to operate, reasonable design, excellent quality, its specifications have hundreds of kinds, is the modern industrial production indispensable companion.
Chiller unit features
1, the unit selected imported brand-name compressor, built-in safety protection, low noise, power saving and durable.
2, imported water pump, large flow, high efficiency, durable.
3, equipped with imported precision digital display temperature controller, can accurately control the water temperature ± 1 ℃, set the temperature range of 5 ℃ -50 ℃.
4, all stainless steel thick water tank, coil evaporator, built-in water replenishment and other devices, easy to clean and maintain.
5, water-cooled unit condenser for the shell and tube type, tube threaded copper tube, reasonable design, good heat transfer effect.
6, the unit is beautiful and generous appearance, the exterior panel adopts quick disassembly form, easy to use and maintenance.
The operation process of the chiller:
1. First of all, the power will be turned on ON position.
2. Turn on the cooling switch, at this time, please note that the cooling water inlet and outlet valves must be opened; (Note that air-cooled without water tower).
3. Then turn on the chilled water pump switch, Jing note that the frozen water inlet and outlet valves must be opened, after a delay switch compressor will be automatically executed, please check and adjust the required temperature.
4. When shutting down the machine, please operate the machine in the reverse order.
Matters that should be noted during operation of the chiller
1. chilled water pump can not be run without water in the tank;
2. operation switch to avoid continuous switching;
3. frozen water temperature reaches the set temperature, the compressor will automatically stop the implementation of the phenomenon is normal;
4. temperature switch should be avoided to set the temperature below 5 ℃ to prevent evaporator icing; (to prevent evaporator icing). Prevent the evaporator icing; (except for low-temperature freezers).
5. In order to ensure that the chiller refrigeration effect, to maintain the best state, please regularly clean the condenser and evaporator and water filter.
The composition of the chiller:
The chiller unit is mainly composed of a hermetic compressor, condenser, thermal expansion valve, filter drier, evaporator, gas-liquid separator, and protection devices.
Chiller working principle
Refrigeration, the refrigeration compressor will be a water heat exchanger within the low-pressure, low-temperature refrigeration gas (R22) suction and cylinder, after the compressor to do the work, so that it does not pressure and temperature of the gas is high, into the condenser, high temperature and high pressure of the refrigerant gas and the cooling medium of the water for the exchange of heat, the heat transfer to the water, while the refrigerant gas condensed into a high-pressure liquid. High-pressure liquid by throttling pressure into the evaporator. In the evaporator, low-pressure liquid refrigerant vaporization, absorb the heat of the surrounding attack medium (refrigerant water), so that the refrigerant water cooling cooling, become the required low-temperature water. Water heat exchanger after the vaporization of low-temperature refrigerant gas and compressor inhalation compression, so that week after week, and constantly back to the circle, the side of the continuous production of cold water.
Selection and purchase of Kadeli chiller should pay attention to the following issues:
1, the cooling capacity is based on the standard:
Temperature conditions
Refrigerated water return temperature of 20 ℃
Refrigerated water temperature 15 ℃
Cooling water inlet temperature of 30 ℃
Cooling water outlet temperature of 35 ℃
Condensing air temperature 35℃
2, the choice of power supply
Main power (three-phase) control power (single-phase)
380V50HZ/220V50HZ
3, the working range
Cooling water outlet temperature 220 ℃ to 37 ℃
Cooling water water temperature difference 3.5 ℃ to 6.5 ℃
Chilled water outlet temperature 5℃ to 20℃
Chilled water in and out of the temperature difference value 2.2℃ to 7℃
4, ordering instructions
a, explain the evaporator is a tank type or shell and tube type
b, whether to build a pump, pump flow and pressure requirements must be specified when ordering
c, the chilled water outlet inlet has special requirements, please specify when ordering
c, chilled water outlet inlet has special requirements, please specify when ordering
d, chilled water outlet inlet has special requirements. requirements, please specify when ordering in addition to the tabulated product model.
How to choose a chillerWe are glad that Kadeli chiller for you to answer:
The market is a mixed bag of chiller, how to choose
Chiller as a refrigeration device industry's most attention, different brands of water chillers, in the evaluation of the various buyers is not the same. Chinese people like this Yang, the product is not used to comment, which is completely inconsistent with the market implementation regulations.
Just in the Guangdong area, there are dozens of chiller manufacturers, customers in the choice of chiller purely from the price of choice, and then get into a bad situation, so why is this situation?
1. Discussed from the price, people buy things first from the price to consider, why the same number of water chillers, the price difference of hundreds of thousands of different; did not consider from the quality of some manufacturers from the accessories on the kung-fu, often assembled with poor-quality parts, the last time we encountered a customer to complain to us in Shenzhen XX bought water chillers with less than a month on the bad, and manufacturers do not provide warranty, so, buy! Chiller or to regular manufacturers to buy (the best site visits); both from the quality, or after-sales service is much better.
2. There is also a situation that the buyers themselves do not follow their own working conditions, the cooling unit needs to be how much refrigeration, such as injection molding with water-cooled water chillers in general, the buyers used an air-cooled effect will be much worse. This situation can be avoided, that is, before purchasing contact factory engineers to see what kind of chiller used to cool the machine is better.
How to buy a chiller.We are very happy to Kadeli chiller factory for you to answer
1, chiller used in that type of device, according to the actual situation to choose
2, chiller according to its own way of heat dissipation is divided into air-cooled or water-cooled, the same unit in the small, air-cooled energy efficiency than water-cooled type 1.2 times worse
3, chiller host compressor structure is divided into, scroll, piston type, Screw, centrifugal, full-liquid type, etc.
4, chiller host evaporator structure is divided into: disk tank type, shell and tube, plate type
5, chiller whether the water tank, water pump structure, generally small units built in, large devices external
6, screw-type chiller is generally the lowest minimum of 90KW minimum, we recommend that the general more than 180KW suitable for screw-type chiller. Our company suggests that more than 180KW is suitable for screw chiller.
7, chiller host shell-and-tube evaporator material, generally copper, alloy copper, stainless steel 304, stainless steel 316, which executes the chiller solution is corrosive, according to the PH value of the solution does not choose the corresponding material, in order to cause unnecessary losses!
How to choose the brand of chillerHuizhou City, Bo Yue refrigeration unit is what we have been using.