# How to judge whether the operating parameters of the chiller are normal?

1. The temperature difference of the evaporator is used to evaluate the heat exchange efficiency of the evaporator of the unit, and the normal value is between 1°C and 3°C

-Temperature difference of evaporator = chilled water outlet temperature – saturation temperature corresponding to evaporating pressure

The unit of saturation temperature corresponding to chilled water outlet temperature and evaporation pressure is Celsius (°C);

1. The temperature difference of the condenser is used to evaluate the heat exchange efficiency of the condenser of the unit, and the normal value is between 1°C and 3°C.

Condenser temperature difference = saturation temperature corresponding to condensing pressure – cooling water outlet temperature

The unit of saturation temperature corresponding to condensing pressure is Celsius (°C)

Cooling water outlet temperature unit is Celsius (°C)

3 Suction superheat is used to evaluate parameters such as refrigerant charge, liquid supply valve adjustment, evaporator heat transfer effect, etc. The normal value of flooded evaporator is between 1°C and 1.5°C;

The normal value of the dry evaporator is between 8°C and 12°C.

Suction superheat = compressor suction temperature – saturation temperature corresponding to suction pressure

Compressor suction temperature unit is Celsius (°C)

The saturation temperature corresponding to the suction pressure is in degrees Celsius (°C)

1. Exhaust superheat is used to evaluate parameters such as refrigerant charge and compressor operating status. The normal value of R-22 refrigerant is between 14°C and 19°C; the normal value of R-134a refrigerant is between 7°C and 10°C. between ℃.

Discharge superheat = compressor discharge temperature – saturation temperature corresponding to discharge pressure

Compressor discharge temperature unit is Celsius (°C)

The saturation temperature corresponding to the exhaust pressure is in degrees Celsius (°C)

1. The degree of subcooling is used to evaluate parameters such as refrigerant charge, liquid supply valve adjustment, and condenser liquid level control. A normal value for a water-cooled condenser with a subcooler is around 5°C.

Subcooling degree = saturation temperature corresponding to condensing pressure – condenser liquid temperature

The unit of saturation temperature corresponding to condensing pressure is Celsius (°C)

Condenser liquid temperature unit is Celsius (°C)

1. Existence of non-condensable gas The existence of non-condensable gas in the system can be known, and the normal value should be less than 3°C.

Existence of non-condensable gas = condensing pressure corresponding to saturation temperature – condenser liquid temperature

The unit of saturation temperature corresponding to condensing pressure is Celsius (°C)

Condenser liquid temperature unit is Celsius (°C)

1. Chilled water flow evaluation The cooling water flow status of the system can be measured by pressure gauges and design (selection) parameter tables.

Cooling water flow and design flow unit should be unified (GPM or M3/hr)

The actual/design flow units of inflow and outflow water should be unified (Psid )

1. Unit input power

The input power of the unit is used to evaluate the energy consumption of the system

Unit input power=input voltage*input current*1.732*power factor/1000

The unit of input power is kilowatt (kW);

The unit of input voltage is volts (V);

The input current unit is ampere (A);

The power factor is usually taken as 0.9;

1. Unit operating efficiency The operating efficiency of the unit is used to evaluate the operating efficiency of the unit.

kW/Ton = input power/cooling capacity of the unit

The unit of input power is kilowatt (kW);

The unit of cooling capacity of the unit is refrigerated ton (RT);

COP = unit cooling capacity/input power;

The unit of unit cooling capacity and input power (kW or RT) COP X kW/refrigerant ton = 3.516

1. Calculation method of cooling capacity and condensation capacity

Cooling capacity = chilled water flow*temperature difference between inlet and outlet of chilled water / 24

– Chilled water flow in gallons per minute (GPM)

– The temperature difference between the inlet and outlet of chilled water is in Fahrenheit (℉)

Condensation = Cooling water flow*Cooling water inlet and outlet temperature difference / 24

– Cooling water flow in gallon per minute (GPM)

– The temperature difference between the inlet and outlet of cooling water is in Fahrenheit (℉)

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