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Hybrid thermal seasonal storage and solar assisted geothermal heat pump systems for greenhouses
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  • Journal title : Advances in Energy Research
  • Volume 4, Issue 1,  2016, pp.87-106
  • Publisher : Techno-Press
  • DOI : 10.12989/eri.2016.4.1.087
 Title & Authors
Hybrid thermal seasonal storage and solar assisted geothermal heat pump systems for greenhouses
Ataei, Abtin; Hemmatabady, Hoofar; Nobakht, Seyed Yahya;
 Abstract
In this research, optimum design of the combined solar collector, geothermal heat pump and thermal seasonal storage system for heating and cooling a sample greenhouse is studied. In order to optimize the system from technical point of view some new control strategies and functions resulting from important TRNSYS output diagrams are presented. Temperatures of ground, rock bed storage, outlet ground heat exchanger fluid and entering fluid to the evaporator specify our strategies. Optimal heat storage is done with maximum efficiency and minimum loss. Mean seasonal heating and cooling COPs of 4.92 and 7.14 are achieved in series mode as there is no need to start the heat pump sometimes. Furthermore, optimal parallel operation of the storage and the heat pump is studied by applying the same control strategies. Although the aforementioned system has higher mean seasonal heating and cooling COPs (4.96 and 7.18 respectively) and lower initial cost, it requires higher amounts of auxiliary energy either. Soil temperature around ground heat exchanger will also increase up to after 2 years of operation as a result of seasonal storage. At the end, the optimum combined system is chosen by trade-off between technical and economic issues.
 Keywords
heating COP;cooling COP;thermal storage;TRNSYS;heat pump;control strategies;parallel;series;
 Language
English
 Cited by
1.
Performance analysis of a soil-based thermal energy storage system using solar-driven air-source heat pump for Danish buildings sector, Applied Thermal Engineering, 2017, 114, 360  crossref(new windwow)
2.
Impact of hybrid system in polyester production, Cogent Engineering, 2017, 4, 1  crossref(new windwow)
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