| Considering the problem of energy shortage and rising price, solar energy as akind of persistent energy source is becoming highly valued. Especially in extremelycold areas, the amount of energy consumed on space heating is huge, and the airpollution is very serious. Solar heating has great benefits in both economy andenvironment. Solar assisted heat pumps(SAHPS) is one of the good choices. Thispaper based on the review of the present research foreign and domestic, the systemperformance can be greatly improved by means of optimizing the structureparameters, automatic control measures and operation strategy. Therefore, thispaper aimed to look for a optimization scheme of the SAHPS system for spaceheating in extremely cold area.In this paper, a solar assisted heat pump(SAHP) system has been proposed.Based on a system which has been built in Daqing, responsible of space heating for4000square meter, the design method and control strategy was introduced. Thesystem has many operating modes in different weather that shows good ability ofenergy conservation. Cooperated with effective control strategy, collected solarenergy is used at the maximum extent. All of the operational modes and conditionsof the mode transition were described in detail.This paper modeled the system respectively using TRNSYS. The rationality ofthe model is verified by comparing the simulation experimental data and themeasured data. Parameter of the solar assurance, solar collector temperature,collector efficiency, heat storage tank temperature, heat pump COP, the runningtime of each mode, etc, analyzing the system performance. Simulation data showthat the heat pump COP can reach5. Then, through changing system parameters,including the slope of collectors, the volume of heat storage tank and the capacity ofthe heat pump, dynamic simulations were made respectively. On the comparison ofthe simulation results, the optimization of the system could be obtained throughimproving the performances of components. Research results of this paper mayprovide some guidance for the design of the sequent indirect solar assist heat pumpsystem, and offer beneficial inspirations in further study of this system. This paper is a part of the12th Five-Year Plan National Science andtechnology support program The Key Technology Research and DemonstrationProject of Heating System Energy Saving in Cold Region. |
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