空气源热泵机组设计应用及案例分析（Design, application and case analysis of air source heat pump unit）.docVIP

空气源热泵机组设计应用及案例分析（Design, application and case analysis of air source heat pump unit） Air source heat pump (referred to as the pump) since 1940s to the present, the technology has been improving, widely used in office buildings, hotels, entertainment, residential buildings, and other industries in different scale project, market share has been high, the reason is because it has the following advantages: heat pump for summer cold, winter heating, without boiler; the host machine is installed on the roof, can save investment, frozen room boiler room construction investment and cooling system; high COP value, high degree of automation. I. types and characteristics of heat pump units: 1. scroll compressor heat pump unit: As a displacement compressor, scroll compressor has the advantages of stable operation, low vibration and low noise. It is often used in air to air heat pump units, and is suitable for medium and small projects. 2. piston compressor heat pump unit: The piston compressor is a displacement compressor, with complex structure, low speed, large vibration, large noise and small capacity. The multi head assembly can be assembled into a heat pump unit of 1 million kcal / h, COP=3.0 to 3.5; 3. screw compressor heat pump unit: Screw compressor for the compressor, simple structure, stable operation, small vibration, low noise, long service life, COP=3.5 ~ 4.5, suitable for medium and small projects, multi head heat pump could be used in large engineering. The single screw is balanced unidirectional operation with little wear and no axial thrust, and the exhaust efficiency is slightly lower than the twin screw. Two. Design of heat pump unit: 1. selection principle: Heat pump has advantages and disadvantages, compared with the same capacity of cooling water chiller, the electricity consumption is big, cost is high, the winter with the outdoor temperature decreased heat attenuation, serious frost is serious, therefore, when a project with a steam source, air condition