Research On Condensation Heat Transfer Characteristics Of HCFC123 Outside Horizontal Tubes In High-Temperature Conditions

Now, energy resource and environment are the great social problems that every country especially our country is faced with. Our country is being lack of energy, energy inefficient, high energy consumption and has the larger discharge of CO2 and SO2. With quickening of cities and economy development speed, China will face great pressure of energy resource supply and environment protection for a long time. Heat pump has been an important technology measure to reduce energy consumption of the fossil energy resource and environment pollution. Alternation and rebuilding of civil and industry boilers with cost, gas and oil demand higher efficiency heating source and high-temperature heat pump (HTHP) is feasible alternate one both in technology and economy. By using the municipal sewage and industrial waste warm water as lower quality heat source, the HTHP has been a sort of very commercioganic heating source and attached importance by government and users. The HTHP, which low quality heat source is waste water including oil, is also an ideal heating source to use in civil central heating system and oil transportation system in oil field.The performance of HTHP is depended on the heat transfer capability of shell-tube condenser, which is an important part of HTHP. The usage of three-dimensional (3D) enhanced tube increases greatly the heat transfer ability of shell-tube heat transferr and improves the operational efficiency of heat pump, achieving better economical effectiveness and prominent effects such as energy conservation, material-saving, weight reduction and compactness. Accordingly, the condensation heat transfer test-board for high-temperature refrigerant is established in the thesis, and the condensation heat transfer performance of HCFC123 outside kinds of tubes is researched under high-temperature condition, which providing a theoretic basis for optimization of shell-tube condenser and the development of HTHP. This thesis is divided into six chapters; the detailed content is given as following.1,The high-temperature refrigerant condensation heat transfer test-board is set up. The experiment goal is determined through the characteristics analysis of refrigerant condensation outside tubes. The structure of test-board and its main...