Is the refrigeration system working properly?

Detection of refrigeration system suction and discharge pressure is to get the purpose of the refrigeration system evaporating temperature and condensing temperature, so as to obtain the operating conditions of the refrigeration system.

(2) Temperature concept in refrigeration system

Temperature concept: the temperature of the refrigeration system involves a wide range of evaporating temperature te, suction temperature ts, condensing temperature, exhaust temperature, etc.; the operating conditions of the refrigeration system plays a decisive role in the evaporating temperature te and condensing temperature tc.

Evaporation temperature te: evaporation temperature te refers to the liquid refrigerant in the evaporator boiling gasification temperature.

For example, the air conditioning unit te. 5 ~ 7 ℃ as the best evaporation temperature of air conditioning unit, that is, air conditioning unit design te 5 ~ 7 ℃, when the overhaul of the air conditioning unit in the debugging, if te less than 5 ~ 7 ℃, should be adjusted to the expansion valve or refrigerant charge adjustment, testing the suction pressure of the compressor, the purpose of which is to understand the unit operation of the evaporation temperature, and te and Can not be directly detected, only through the detection of the corresponding evaporation pressure and get its evaporation temperature.

Condensation temperature tc: the condensation temperature tc is the temperature at which the superheated vapor of the refrigerant condenses to liquid after exothermic condensation in the condenser. Condensing temperature can not be directly detected, only through the detection of its corresponding condensing pressure, and then by consulting the refrigerant thermal properties of the table and get;

Condensing temperature is high, the condensing pressure is relatively high, they correspond to each other; condensing temperature is too high, the unit load is heavy, motor overload, in the operation of the unfavorable, the cooling capacity of the corresponding decline in power consumption, should be avoided as far as possible.

Exhaust temperature td: exhaust temperature td is the temperature of the compressor exhaust port, including the temperature of the exhaust port receiver.

Detecting the exhaust temperature must have a temperature measurement device, general small machine is not set up, temporary measurement of available semiconductor point thermometer detection, but the error is large.

Exhaust temperature is affected by the suction temperature and condensing temperature, suction temperature or condensing temperature rises, the exhaust temperature also rises accordingly, so to control the suction temperature and condensing temperature in order to stabilize the exhaust temperature.

Suction temperature ts: The suction temperature ts is the temperature of the gas in the suction connection tube of the compressor. Detection of suction temperature needs to have a temperature measurement device, generally small units are not set up temperature measurement device. Inspection and commissioning is generally estimated by hand touch, air conditioning unit suction temperature is generally required to control ts = 15 ℃ for about good. More than this value has a certain effect on the cooling effect.