Integrated Research And Engineering Application Of Water Source Heat Pump System

As a technology of energy efficiency and environment protection, Water Source Heat Pump(WSHP) had been applied to the field of heating, ventilating and air conditioning widely in developed countries. At present, because the core of some necessary subassemblies can't be produced in China, some remarkable technology gap in the field of research and application between China and the developed countries has been brought on. To reduce this gap, with the help of the social and natural fund of Beijing education committee and some institutes of Beijing, Shandong, Harbin, integrated research of WSHP has been made deeply.According to the theory of thermodynamics and mathematics, this paper analyzes the principle of energy efficiency, provides the mathematical expression about energy-efficiency ratio(EER) and water source(WS). Then the technical and economical characteristic of WSHP is studied. Calculating results of example projects show that the WSHP is superior to the traditional air conditioning system in the technical and economical respects.Based on the advanced technology of some developed countries, by theory analyses, a new style of WSHP composed of four scroll compressors parallel connection is developed. The latest DANFOSS series of scroll compressors made in France are used in this WSHP. It resolved the problem of the power of a single scroll compressor on the small side successfully. The coefficient of performance (COP) of this system is 1:4.2, checked by China institute of metrology, proved lead in China. Thorough analysis and calculation of various subassemblies about optimizing design of WSHP is made in this paper, supplying a reliable basis for safe, economical, convenient design and construction of the WSHP system.To analyze and calculate the performance of the compressor, a series of equations about condensation temperature, evaporation temperature, refrigeration power, power output by a curve simulation method based on the practice data can be gained. Comparing these equations,some significative conclusions have been get.A series of control systems are designed in this WSHP, which ensure the heat pump circulate efficiently and determine which compressors start or stop automatically according to energy requirement. Then multipurpose function is designed to protect the compressors and the whole system.All the researches mentioned in this paper have been applied to engineering practice. Analyzing the water delivery of the well source, a new method, called single well source technique, is presented to solve the problem of water output and input. It has been proved that the research results have much promotion in the field of energy-efficiency and environment protection.According to three kinds of WSHP we designed, some design methods of WSHP have been put forward. All of the methods and new types of WSHP have made remarkable benefits.