Heat exchange system and heat exchange method

Abstract

The disclosure relates to the technical field of refrigeration, in particular to a heat exchange system and a heat exchange method. The heat exchange system can increase the suction/discharge superheat of a refrigerant and decrease the temperature of lubricating oil, thus improving the viscosity and lubrication performance of the lubricating oil; and the heat exchange system has a low cost, a simple structure and a small size and is suitable for different types of refrigeration systems. The heat exchange system comprises a compressor, an evaporator, a heat exchanger, an inlet line, a first regulating device and an outlet line. A heat exchange line is arranged in the heat exchanger, the inlet line is connected to the evaporator and the heat exchange line, the first regulating device is arranged on the inlet line and the outlet line is connected to a suction inlet of the compressor and the heat exchange line.

1 . A heat exchange system, comprising:
 a compressor;   an evaporator, in which a refrigerant circulates;   a heat exchanger, in which a heat exchange line is arranged;   an inlet line, connected to the evaporator and the heat exchange line;   a first regulating device, arranged on the inlet line and used for pumping the refrigerant from the evaporator into the heat exchange line; and   an outlet line, connected to a suction inlet of the compressor and the heat exchange line.   
     
     
         2 . The heat exchange system according to  claim 1 , further comprising a second regulating device arranged on the outlet line. 
     
     
         3 . The heat exchange system according to  claim 2 , wherein the heat exchange line comprises a primary-side line and a secondary-side line;
 the heat exchange system further comprises an oil separator, and an oil and refrigerant mixture from the oil separator flows through the primary-side line;   the refrigerant from the inlet line flows through the secondary-side line.   
     
     
         4 . The heat exchange system according to  claim 3 , wherein a temperature difference between the refrigerant in the inlet line and the refrigerant in the outlet line is within 20-40° C., and a temperature difference of the oil and refrigerant mixture before and after flowing through the heat exchange line is within 20-50° C. 
     
     
         5 . The heat exchange system according to  claim 4 , wherein the first regulating device and/or the second regulating device is configured as an air pump or a flow control valve. 
     
     
         6 . A heat exchange method, being applied to the heat exchange system according to  claim 5 , and comprising:
 a step of heat exchange: pumping the refrigerant from the inlet line into the heat exchange line to exchange heat with the oil and refrigerant mixture in the heat exchange line; and   a step of discharging: discharging the refrigerant subjected to heat exchange to the suction inlet of the compressor by means of the outlet line.   
     
     
         7 . The heat exchange method according to  claim 6 , further comprising a step of regulation: regulating a pressure of the refrigerant or a flow rate of the refrigerant in the inlet line and/or in the outlet line respectively by means of the first regulating device arranged on the inlet line and/or the second regulating device arranged on the outlet line. 
     
     
         8 . The heat exchange method according to  claim 7 , wherein a temperature of the refrigerant in the outlet line is increased by 20° C.-40° C., compared with a temperature of the refrigerant in the inlet line. 
     
     
         9 . The heat exchange method according to  claim 7 , wherein a temperature difference of the oil and refrigerant mixture before and after flowing through the heat exchange line is within 20-50° C.