This is an open access article distributed under the CC BY-NC-ND 4.0 terms and conditions.
Volume 14 article 383 pages: 296-305
In this research,
optimum design of a 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 1.5 ̊C 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 economical issues.
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