An Expermental Study On A Direct-expansion Solar-assisted Heat Pump Without Water System In Lanzhou

In recent years, with environmental damage caused by the rapid growth of economy, solar energy, a source of pollution-free clean energy, more and more get people’s attention. Aiming at the problem of energy shortage and environmental pollution currently in China, this paper propose a new type of solar heat pump waterless system for the purpose of sustainable development. Other purpose of the system is energy-saving and emission-reduction. Based on the use of solar energy and heat pump system, the direct expansion solar heat pump system combined with floor heating system. The solar heat pump waterless system overcome shortcomings between floor heating system and solar system with high efficiency.Combining outdoor thermal environment in Lanzhou region, on the basis of the theory of solar-assisted without water heat pump system analysis, this paper carried out the design and selection of solar-assisted without water heat pump system experimental device, built a solar heat pump system laboratory, and research experimental and simulation. The main research harvests are as follows:This paper describes the basic principles of solar-assisted without water heat pump heating system, analyzes the system component, establish the experimental model of solar assisted heat pump heating system, research the feasibility of the system.Using experimental methods to research the solar collector/evaporator, the heat pump compressor, warm coil changes in various parameters typical outdoor thermal environment. This paper verify the feasibility of radiant floor pipe in practical applications.Experimental results show that the new solar-assisted heat pump heating system has greatly improved the efficiency of the use of solar heating, and better able to take advantage of this system in the small apartment.Based on DeST-h, this paper research the thermal environment of the lab room, verify the feasibility of the system by comparing the temperature of experimental and simulation. In addition, based on the annual cost method, this paper research the economical efficiency of the new system by comparing the investment of different systems, the results show that the system has moderate economic advantage and significant environmental benefits.This paper shows that this system has some advantages in energy conservation, environmental protection, and economical efficiency. This paper provides the basis for the application of solar energy in the cold area.