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Chiller System Parameters and Analysis

Feb. 26, 2021

Chiller is a kind of water cooling equipment, chiller is a kind of cooling water equipment that can provide constant temperature, constant flow and constant pressure. The chiller works by first injecting a certain amount of water into the machine's tank, cooling the water through the chiller's refrigeration system, and then sending the low-temperature cooling water to the equipment to be cooled by the pump. The chilled water from the chiller takes the heat away and then the temperature rises and flows back into the tank to achieve the effect of cooling. The next chiller supplier will introduce you to the chiller system parameters and analysis.

Condensing pressure and condensing temperature

The cooling medium used by the condenser has an important impact on the condensing temperature and condensing pressure of the chiller. The condensing temperature of the chiller unit varies with the temperature of the cooling medium. The condensing temperature of the water-cooled unit is generally higher than the cooling water outlet temperature of 4℃~8℃, and if it is higher than 8℃, the copper tube inside the condenser should be checked to see if it needs to be cleaned for scale; the condensing temperature of the air-cooled unit is generally higher than the outlet air temperature of 5℃~10℃.

 Water Cooled Scroll Chiller

When the condensing temperature rises, the power consumption increases. Conversely, the condensing temperature decreases and the power consumption decreases. When air is present in the condenser, the temperature difference between the condensing temperature and the cooling water outlet increases, while the temperature difference between the inlet and outlet of the cooling water decreases instead, when the heat transfer effect of the condenser is not good and the condenser shell feels hot.

 

In addition to this, the influence of scale and sludge on the water side of the condenser tubes on heat transfer also plays a considerable role. Therefore, when the chiller unit is in operation, attention should be paid to ensuring that the cooling water temperature, water quantity and water quality indicators are within the qualified range.

Pressure and temperature of cooling water

The chiller unit operates under nominal working conditions, with its condenser inlet water temperature of 32℃ and outlet water temperature of 37℃, with a temperature difference of 5℃. Under nominal operating conditions, the pressure drop of the inlet and outlet water of the condenser is generally about 0.07MPa. Pressure drop adjustment method is also taken to adjust the cooling water pump outlet valve opening and condenser inlet and outlet water pipe valve opening method.

The principles followed are also two: one is that the condenser outlet water should have sufficient pressure to overcome the resistance in the cooling water pipeline; the second is that when the chiller unit is operating under the design load, the temperature difference between the inlet and outlet condenser cooling water is 5°C.

It should also be noted that the practice of arbitrarily over-opening the cooling water valve and increasing the cooling water volume to lower the condensing pressure in an attempt to reduce energy consumption can only be contrary to what is desired and counter-productive.

Water Cooled Scroll Chiller

Water cooled scroll chiller cooling capacity from 9KW to 120KW. This series units integrates the characteristics of many other products, using imported full-closed scroll compressors, supplemented by high-efficiency heat exchangers and adopts microcomputer controllers, which makes the unit compact, reasonable layout, convenient to use and maintain. It is automatically adjusted according to load changes and is more energy efficient.

 


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