Working principle of chiller unit

Working principle of chiller unit

The refrigeration system of a chiller unit consists of four basic parts: a compressor, a condenser, a restrictor, and an evaporator. Connect the four major components into a closed system in a certain order using copper pipes, and fill the system with a certain amount of refrigerant.

The compressor sucks in low temperature and low pressure Freon gas from the evaporator, compresses it into high temperature and high pressure Freon gas, and then flows through a thermal expansion valve (capillary), throttling it into a low temperature and low pressure Freon liquid two-phase object. Then, the low temperature and low pressure Freon liquid absorbs heat from the indoor air in the evaporator, compressing - condensing - throttling - evaporating repeatedly.

1, Chiller unit

This is the "cooling source" and "heart" of the central air conditioning system. The circulating water to each room is exchanged internally by the chiller unit, which cools down to "cooling water".

2, External heat exchange system

Chilled water circulation system: composed of a chilled pump and chilled water pipeline. The chilled water flowing out of the chiller unit is pressurized by a refrigeration pump and sent to the chilled water pipeline for heat exchange in the room, taking away the heat inside and causing a decrease in temperature inside the room.

Cooling water circulation system: composed of cooling pump, cooling water pipeline, and cooling tower. The chiller unit conducts heat exchange, cooling the water temperature while releasing a large amount of heat. The heat is absorbed by the cooling water, causing the temperature of the cooling water to rise. The cooling pump will feed the heated cooling water pressure into the cooling tower, allowing it to exchange heat with the atmosphere in the cooling tower. Then, the cooled water will be sent back to the chiller unit.

3, Cooling fan

Indoor fan: installed in the room where cooling is required, used to blow air cooled by chilled water into the room and accelerate heat exchange within the room.

Cooling tower fan: used to reduce the water temperature of the cooling tower and accelerate the heat brought back by the "return water" to dissipate into the atmosphere.

4, Startup and operation of chiller units

Check the oil level and temperature of each compressor: the oil level is between 1/3 and 2/3; The oil temperature is between 50 ℃ and 60 ℃, and touching the heater with your hand will make it hot.

Check the main power supply voltage and current: the power supply voltage is within the range of 340V to 440V; The three-phase voltage imbalance value is less than 2% (>2% must not be turned on); The three-phase current imbalance value is less than 10%.

Chilled water pump and cooling water pump: after the circulation of the two water systems is established, adjust the opening of the inlet and outlet valves of the evaporator and condenser.

Check the temperature of the chilled water supply: whether the set value is appropriate, if not, it can be changed.

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