Experimental study on variable working conditions of quasi-secondary compressed air source heat pump system Hu Hong 1 Huang Hu 1 Zhang Zhongbin 1 Yuan Dongxue 1 Gong Jinzhu 2 Chen Zemin 3 (1 Nanjing Normal University, Nanjing 210042 2 Dalian Development Zone Planning and Architectural Design Institute, Dalian 116200 3 Jiangsu Danyang Suike Air Energy Research Center Co., Ltd., Danyang 212300) carried out a large-scale variable working condition test and obtained the changes of input power, heating capacity and COP exhaust temperature of the unit under various working conditions. Through the variable working condition experiment, considering the heating capacity, COP and unit working stability, the optimal intermediate air pressure of the quasi-secondary compression heat pump system is 1200 kPa~ 1400 kPa. The research results can be provided for the design and application of the quasi-secondary compression system. The mass content is in the range of 7%~13% overlapping, and the WR1 is in the range of 82~89, and the corresponding WO relative error range is 25%. 4 Conclusion (1) The condensation heat transfer coefficient is obtained. The relationship with the sensible heat transfer of the mixed gas. Within a certain range of mass flow rate of the mixture, the condensation heat transfer coefficient increases monotonically with the increase of sensible heat transfer of the mixed gas. The relationship between the condensation heat transfer coefficient and the mass content of non-condensable gas is obtained. When the air quality content is less than 4%, the heat transfer coefficient decreases greatly. When the air quality content increases from 2% to 4%, the condensation heat transfer coefficient decreases by about 46%, and the increase of air quality content is greatly reduced. Heat exchange capacity. When the air content is further increased, the heat transfer coefficient also tends to decrease monotonously, but the degree of decline is slow. (3) Comparing the condensation criterion equation obtained in this experiment with the obtained condensation criterion equation, and obtaining the correlation formula of the condensation standard in the horizontal round tube under the small air mass content range, Sheet metal fabrication processing is formed by laser cutting or stamping process, shear and bending, bending, bending, welding, riveting. The Sheet metal fabrication used are cold-rolled plate (SPCC), hot-rolled plate, galvanized plate (SHCC) (SECC, SGCC), copper (CU) brass, copper, beryllium copper, aluminum (5052), stainless steel. Sheet metal fabrication processing steps: according to the parts drawing (3D) expanded into a plan (2D), laser cutting or die stamping shape, CNC punching each bending part, should pay attention to the direction of the burr of the workpiece. Then the students are welded or riveted (some). Surface treatment after processing: electroplating, passivation, sand blasting (powder), anode treatment. Products are generally made for the connection and the outer cover. Applications in robotics, drone, communications, medical devices, industrial automation equipment. Sheet Metal Fabrication,Oem Sheet Metal Fabrication,Sheet Metal Forming,Sheet Metal Bending Hong Kong RYH CO., LTD , https://www.szcncmachining.com