Unitization of refrigeration system is the development direction of modern refrigeration equipment. The chiller is a refrigeration unit that assembles all or part of the refrigeration equipment into a whole and directly supplies the required refrigerant water to the user.

There are many types of chillers, and the applicable environments and uses of different chillers are also different. The following are our six suggestions for chiller selection:

1. Refrigeration system load = indoor load + reheat load + fresh air load. If the total load of the air-conditioning system is calculated from the estimated index of the air-conditioning load, then the load of the refrigeration system = the total load of the air-conditioning system.   
2. When selecting an electric-driven chiller, when the cooling capacity of a single air conditioner is Q>1163kw, a centrifugal chiller should be selected: when Q=580-1163kw, a centrifugal or screw chiller should be selected: when Q<580kw , Piston chillers should be used. When the average outdoor temperature in winter is higher than -10°C, the heat pump chiller can be used.   
3. The COP of the refrigeration system of the electric-driven refrigerator is about three times higher than that of the thermal system of the absorption refrigerator. The order of consumption from low to high is: centrifugal type, screw type, piston type, absorption type. Therefore, only when there is a suitable heat source, especially in places where waste heat or waste heat can be used, or in places where electricity is lacking, should the absorption chiller be selected.   
4. It is generally advisable to choose 2-4 chillers, 2 sets for small and medium scale, 3 sets for larger scale, and 4 sets for extra large scale. The possibility of mutual backup and alternate use should be considered among the units. In the chiller machine room, a combined scheme of unit deployment with different capacities can be adopted to save energy consumption.   
5. Environmental pollution should be considered when selecting chillers: first, noise and vibration, to meet the requirements of the surrounding environment; second, the degree of harm of refrigerants to the atmospheric ozone layer and the size of the greenhouse effect.   
6. Regarding the selection of the number of chillers, try to avoid the selection of a single chiller. If conditions permit, two or more chillers can be selected. In this way, the standby chiller can be ignored, and the load changes.