1. When selecting chillers, priority should be given to those with higher performance coefficient. According to the data statistics, the operation time of general water chillers under 100% load in the whole year accounts for less than 1/4 of the total operation time. The proportion of 100%, 75%, 50% and 25% load operation time in the total operation time is about 2.3%, 41.5%, 46.1% and 10.1%. Therefore, when selecting chillers, priority should be given to models with flat efficiency curves. The regulating range of chiller load shall be considered during design and selection. Multi head screw chiller has excellent partial load performance, which can be selected according to the actual situation.
2. The selection of chiller shall be considered according to the cooling load and purpose. For the refrigeration system with long operation time under low load, it is better to select multi head piston compressor unit or screw compressor unit for easy adjustment and energy saving.
3. During design and selection, attention shall be paid to that: under the nominal flow condition, the outlet temperature of cold water shall not exceed 15 ℃, and the outdoor dry bulb temperature of air cooling unit shall not exceed 43 ℃. If it is necessary to exceed the above range, it is necessary to know whether the use range of the compressor is allowed and whether the power of the equipped main motor is sufficient.
4. When selecting the chiller, pay attention to the normal working range of this type of chiller, mainly because the current limit of the main motor is the current value of the shaft power under the nominal working condition.
5. When selecting water chillers, pay attention to the conditions of nominal working conditions. The actual cooling capacity of the chiller is related to the following factors:
(a) Cold water outlet temperature and flow;
(b) Inlet water temperature, flow rate and fouling coefficient of cooling water.
You are welcome to pay attention to the official website of Amy High Refrigeration (www.szamigo. cn), which will continuously update you with some knowledge about the chiller industry.
