The Effect of Evaporator Pressure Behavior at Start-Up Conditions of Air Conditioning Systems to Energy Consumption and Heat Transfer

The energy issue is necessary today due to the decrease in fossil energy and its impacts on the environment. It is important to use energy effectively. In the air conditioning sector, the energy consumption of air conditioners is the top energy user in buildings. The air conditioner user needs to find the best way to operate the air conditioner. In the present research, the effect of pressure behavior at start-up conditions on the energy consumption and heat transfer process is analyzed. The result shows that the pressure behavior affects the evaporator temperature, specific heat, and thermal conductivity in liquid and vapor conditions. In the first 20-second AC operation, the energy consumption of the AC compressor increases significantly before the compressor work slowly decreases at 40-second operation and remains constant at steady conditions. The negligible heat transfer at the first 20-second AC operation increases steeply for 40 seconds. The heat transfer is steady at 60 seconds of operation and above.