Simulation study of solar-source heat pump system with sensible energy storage
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Simulation study of solar‑source heat pump system with sensible energy storage Kadir Bakirci1 · Bedri Yuksel2 Received: 14 March 2020 / Accepted: 16 July 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract A simulation study of the solar-source heat pump (SSHP) system that consists of solar collector group, heat exchanger (waterto-water), energy storage tank, heat pump with vapor compression and circulating pumps is carried out. The performance of the designed system is investigated both experimentally and theoretically. The performance of coefficient of the heat pump in the refrigerant circuit (COP) and whole system (COPS) is computed in the range of 3.1–4.2 and 2.3–3.3, respectively. The sensible energy stored system used of the water as storage matter is theoretically tested for the first time in the cold climate conditions. A simulation model of the energy stored SSHP is also performed, and the simulation results are compared with the experimental conclusion. In average, the differences between the theoretical and experimental values of the COP and COPS are about 8 and 5%, respectively. It is found that the developed model corresponds well with the experimental data. Keywords Solar energy · Heat pump · Energy storage · Solar-source heat pump · Sensible energy storage List of symbols A Area (m2) C Specific heat (kJ kg−1 K−1) I Instantaneous solar radiation (W m−2) ṁ Mass flow (kg s−1) Q̇ Heat load (rate) (kW) T Temperature (°C) V Volume (m3) Ẇ Power (kW) x Vapor quality Greeks Δ Difference η Efficiency υ Specific volume (m3 kg−1) Subscripts amb Ambient aw 50% antifreeze–water mixture c Condenser cd Condensation * Kadir Bakirci [email protected] 1
Department of Mechanical Engineering, Atatürk University, 25240 Erzurum, Turkey
Department of Mechatronics Engineering, Istanbul Gelişim University, 34315 Istanbul, Turkey
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cl Collector cp Compressor cwo Water outlet from condenser e Evaporator ev Evaporation ewi Water inlet from exchanger i Inclined plane l Liquid p Pump pe Plate heat exchanger r Refrigerant s Swept sat Saturate sh Superheating sc Subcooling t Tank w Water v Vapor Abbreviations COP Coefficient of performance for heat pump COPS Coefficient of performance for whole system EST Energy storage tank SSHP Solar-source heat pump
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Introduction The solar-source heat pump systems ensure a clean and new way in the heating sector. These systems present important environmental protection and energy saving when compared with the conventional systems. They are rising with the appearances of the energy crisis in the world and the increasing environmental problems. As regards global environmental problems, the emissions of world’s carbon dioxide have increased with its energy consumption. Turkey is excessively addicted on external energy resources that influence the economy, and harmful emissions in environmental are becoming an important problem in the country. Heat pumps supply heating with renewable energy from the natural sour
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