March 3, 2022
The company has developed a method for controlling the electronic expansion valve of the transcritical carbon dioxide heat pump system, which includes the following steps: step 1, collecting the exhaust pressure value; step 2, determining the water control parameters; step 3, confirming the optimal exhaust pressure of the transcritical carbon dioxide heat pump system ; Step 4, adjust the exhaust pressure; Step 5, calculate the COP when the system is in a steady state; Step 6, verify the optimal exhaust pressure through the particle swarm optimization algorithm (PSO). The invention adopts the coordination of electronic expansion valve opening adjustment and exhaust temperature change to realize the method of controlling exhaust pressure, has fast sampling speed, high precision, small time lag, has strong robustness, and overcomes the traditional The defect of the exhaust temperature control method is to avoid the hidden danger of liquid backflow due to the high exhaust temperature of the compressor. The invention controls the pressure of the transcritical carbon dioxide heat pump system, a refrigeration system with strong nonlinear characteristics, so that the transcritical carbon dioxide heat pump system has faster adjustment and control capability when it operates under different working conditions.
