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As for the buildings that employs ground source heat pump (GSHP) systems for heating and cooling, the heat load is obviously higher than the cooling load, which can cause the temperature of underground medium to decrease gradually and therefore affect the heating performance of the system. This paper proposes a dualsource system in which an air source heat pump (ASHP) and a ground source heat pump (GSHP) jointly bear the heat load in winter, and proposes a novel load ratio control strategy that is better than the existing ones, and the strategy can be employed to overcome the drawbacks of single GSHP system effectively Take an office building as the research object, the TRNSYS simulation platform was used to complete the simulation calculation of building load, the mathematical models of both GSHP and ASHP units were established, and then the system modules of dual source system were established based on the simulation platform.With the objective of slowing down the temperature reduction of the subsurface medium, three strategies were designed around the dualsource system: time control, dry bulb temperature difference control and rated maximum load ratio control, and the parameters were output time by time. A comparative analysis of both a single GSHP system and a composite system showed that the composite system with a rated maximum load ratio of 70% control had the lowest soil temperature fluctuations over 10 years of operation. The research results of this paper can provide theoretical basis and technical guidance for the project of hrbrid GSHP system, and promote the popularization and application of geothermal energy technology.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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