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Refrigeration system ( 2)

2020/09/20
Inspiratory pressure affect the refrigeration system is refrigeration system is running,
the suction pressure and the evaporation temperature and the refrigerant flow rate has a close relationship. For system expansion valve, suction pressure and expansion valve opening, refrigerant filling amount, the cold efficiency of the compressor, and the size of the load. With the capillary system, suction pressure and condensing pressure, refrigerating capacity, compressor refrigeration efficiency, as well as the size of the load. Therefore when check the refrigeration system, should according to the pressure gauge in the suction pipe. Testing inspiratory pressure has important effect to failure analysis.
( 1) Inspiratory pressure factors of low suction pressure below normal, no enough known as refrigerating capacity, cold load is small, small expansion valve opening, low condensing pressure ( ) by means of a capillary system , and the filter is not clear.
( 2) Inspiratory pressure high suction pressure is higher than normal, from known as refrigerant, cooling load too much big, expansion valve opening degree, high condensing pressure ( Capillary system) Poor and compressor efficiency. Exhaust ( Condensation) Pressure change on the influence of the refrigeration system
refrigeration system is running, the exhaust pressure and condensation temperature, condensation temperature and the cooling medium flow rate and temperature, the refrigerant flow, cold load and so on. When check the refrigeration system, should be in an exhaust pressure gauge is installed in place of the exhaust pipe, exhaust pressure, as the data analysis.
( 1) High exhaust pressure factors when the exhaust pressure is higher than normal, usually with the flow of cooling medium small or cooling medium temperature is high, the industrial ice machine filling quantity too much, cooling load and the expansion to open big, etc.
the above factors will cause the system of circulation flow rate increases, the condensation heat load also increases accordingly. Due to the heat is not all out in time, cause condensation temperature rise, and can detect exhaust ( Condensation) Pressure rise. In the cooling medium flow rate under the condition of low or high coolant temperature, condenser cooling efficiency lower and make the condensation temperature rise. In the cooling medium flow rate under the condition of low or high coolant temperature, condenser cooling efficiency lower and make the condensation temperature rise. For the refrigerant filling quantity too much reason, redundant refrigerant liquid occupies part of condenser pipe, reduce condensation area, causing condensation temperature rise.
( 2) Exhaust pressure factors of low exhaust pressure below normal, no enough known as the low efficiency of the compressor, refrigeration dose, small cooling load, the openness of the expansion valve, filter does not open, including the expansion valve filter and low temperature of cooling medium.
the above several factors can cause the system flow of cooling down, the cooling load is small, the condensing temperature drop.
from the suction pressure and exhaust pressure with the exhaust pressure change, both have close relationship. In general, inspiratory pressure, exhaust pressure also rise accordingly; Suction pressure drop, exhaust pressure is also reduced. Can also be from the change of inspiratory pressure gauge has estimated that a general idea of the exhaust pressure.
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