Five important points for attention when selecting piston chillers

Five important points for attention when selecting piston chillers

The main control parameters of piston chillers are energy efficiency ratio, rated cooling capacity, input power, refrigerant type, power supply voltage, etc. Below, the editor of okmarts.com introduces the selection points of piston chillers in detail.

　　 1. When selecting a chiller, pay attention to the normal operating range of this type of unit, mainly because the current limit of the main motor is the current value of the shaft power under the nominal operating conditions.

　　2. The selection of chillers should be considered based on cooling load and usage. For refrigeration systems that operate under low load conditions for a long time, multi-head piston compressor units or screw compressor units should be selected for easy adjustment and energy saving.

　　3. When selecting chillers, give priority to units with higher coefficient of performance. According to statistics, the average operating time of chillers at 100% load throughout the year accounts for less than 1/4 of the total operating time. The proportions of 100%, 75%, 50%, and 25% load operating time of the total operating time are roughly 2.3%, 41.5%, 46.1%, and 10.1%. Therefore, when selecting chillers, priority should be given to models with a relatively flat efficiency curve. At the same time, the load adjustment range of the chiller should be considered when designing and selecting. Under nominal conditions, the adjustment range of the piston compressor is roughly 25%, 50%, 75%, and 100%.

　　 4. When selecting a chiller, pay attention to the conditions of the nominal working condition. The actual cold output of the chiller is related to the following factors: a) the temperature and flow of the cold water outlet; b) the inlet temperature, flow and fouling coefficient of the cooling water.

　　 5. Attention should be paid in design and selection: under the nominal working condition flow, the outlet temperature of the cold water should not exceed 15℃, and the outdoor dry bulb temperature of the air-cooled unit should not exceed 43℃. If it is necessary to exceed the above range, it should be understood whether the compressor is allowed to use and whether the power of the main motor is sufficient.