| In winter heating period than refrigeration period long summer in northwest China,building the heating load is greater than the air conditioning load for the whole year. Ifonly using soil source heat pump system, remove heat from the soil is more than wintersummer heat released into the soil, system running all the year round to cause a declinein the underground soil temperature year after year, and hard to restore the transitionseason, so that the heat pump running performance degradation.SGSHP system is acombination of a new type of energy-saving, environmental protection system, thesystem with solar energy as the main heat source, soil heat as auxiliary heat source,summer with soil source heat pump for cooling room, at the same time to the soil heatremoval; Fall use of solar energy heating system on soil heat storage; Winter use of soilsource heat pump to the accumulation of heat in the soil and solar heating systemcombined heating, effectively achieve the heat season use. Solar-key equipment sizeoptimization matching in soil source heat pump can improve the system efficiency,energy saving, and can keep the soil thermal balance throughout the year.This article embarks from the system design, this paper introduces the SGSHPsystem composition, operation principle and operation mode, and the operation modecontrol transition conditions; Through the analysis of the theory of the system, usingTrnsys software SGSHP system model is established, and through temperaturecontroller parameters and time control of each part rev. Stop, the system runningsimulation results and the selection of experimental data were compared. The temperature of the selected representative concrete analysis, validate the rationality ofthe model.In this paper, we study on system energy saving, efficiency and soil heat balancethroughout the year for the principle, the optimizing selection of scale heat pump unitsand the collector area method; In northwest typical regions different situation ofbuilding cooling and heat load, analyzes the key equipment of the optimal selection inSGSHP systems; Be applicable to the SGSHP system heat pump units in the scale andthe collector area of the matching results. For different cold and hot load thanconstruction, the optimized SGSHP system optimal formula of heat pump (heat) ratingscale range of26w/m2~67w/m2, the best proportion of collector area of the range of0.14~0.25; Before and more optimized, the optimized SGSHP system heat pumpsmaller rate was5%~12%, the collector area reduction rate was11%~28%.Buildings in lanzhou area of cold and hot load ratio of1:1.2,1:1.4,1:1.6, forexample, to simulate the optimized system run throughout the year, respectively, havedifferent situation of building cooling and heat load of system operating characteristicsthroughout the year. To illustrate the advantages of the optimized system, from energysaving, efficiency, heat balance of soil for the Angle of three systems run results beforeand after optimization were analyzed: the optimized system run throughout the yearaverage COP increased0.16,0.22,0.27, respectively; System cost change valuedecreased by15.24%,12.62%,12.03%respectively; Soil temperature recovery rate forthe whole year closer to100%, and the optimized system is a cycle of soil temperatureis0.24℃, which is feasible in engineering. This shows that the optimized system moreenergy efficient, economic and environmental protection. Conclude that the fivenorthwestern provinces of typical city than construction corresponding to different coldand hot load SGSHP system collector area and the ratio of heat pump size optimizationscheme, so as to provide reference for engineering practice. |
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