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Wu J.,Xi'an Jiaotong University | Li Y.,Xi'an Jiaotong University | Li Y.,Guangzhou Quality Supervision and Testing Institute | Wang G.,Xi'an Jiaotong University | And 3 more authors.
Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | Year: 2014

The measurement of the internal dynamic pressure and performance test of a hermetic rolling piston compressor with R22 and R290 as refrigerant respectively were conducted under the high efficiency condition to investigate the effects of thermophysical properties of propane (R290) on the internal thermodynamic process and thermodynamic loss distribution of the compressor. A new method to analyze the indicated diagram of a rolling piston compressor was proposed. The re-expansion loss of high pressure gas in clearance volume is divided into the supercharging loss and the backflow loss, and thus the indicated diagram can be divided into seven parts by the method. The test results show that with R290 as the substitute of R22, the cooling capacity, indicated power and input electric power decrease, and the volumetric efficiency drops slightly. The indicated efficiency and COP rise slightly, and the high frequency pressure fluctuation during the compression and discharge processes does not exist. In addition, the discharge pressure loss decreases, and the heat losses in the suction and compression processes increase and the clearance loss is almost the same.

Wu J.,Xi'an Jiaotong University | Hu J.,Xi'an Jiaotong University | Chen A.,Xi'an Jiaotong University | Mei P.,Guangdong Midea Electrical Holdings Co. | And 2 more authors.
Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | Year: 2015

The heat conduction and convection between components, refrigerant and lubricant oil in R32 rolling piston compressor are numerically simulated. The interactive fluid area and solid parts are totally evaluated by fluid-solid coupled heat transfer analysis. And the temperatures of cylinder, oil, motor and refrigerant vapor inside the compressor are measured experimentally under GX, ARI and ASHRAE/T1 conditions for a compressor used for room air conditioner. The theoretical predictions well coincide with the experimental data. The oil temperature on side of pump drops quickly and the temperature distribution in the bottom of pump is relatively uniform; the temperature on inner cylinder surface increases gradually from the suction port to exhaust side, and the winding temperature of motor is higher than core temperature; the temperatures at the top of stator winding are 94.0℃, 119.2℃, 136.9℃, respectively, under the above three conditions; the stator winding temperature under ASHRAE/T1 condition is more than 130℃ beyond common B insulation level, thus it is necessary to reduce discharge temperature of compressor. ©, 2015, Xi'an Jiaotong University. All right reserved.

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