A greenhouse heating simulation in the cold climate with a water source heat pump assisted with solar energy

In this thesis, a solar assisted and water source heat pump (SAHP) system has been designed for heating two greenhouses with different set point temperatures in Van climate conditions. These greenhouses were called as cold and warm greenhouses according to their set point temperatures. The setpoint temperatures of the cold and warm greenhouse are 6 ° C and 17 ° C, respectively. Both greenhouses were simulated with the TRNSYS (transient system simulation tool) program and the performance and annual energy consumption of the system were examined. In two greenhouse systems, glass and double-layer polyethylene (DPE) greenhouse cover materials were used and annual heating energy requirements were compared. The nominal heating capacity and heat pump power consumption values of the heat pump of the cold greenhouse system are 8.33 kW and 1.66 kW, respectively. It is 17.85 kW and 4.96 kW in the warm greenhouse, respectively. The effects of different types of solar collectors, tank volumes and collector areas on total annual energy consumption were investigated for these two SAHP systems under the Van climate conditions. According to the results obtained in this study, the use of DPE greenhouse cover instead of glass greenhouse cover in cold and warm greenhouses saves 55 % and 44 % energy annually respectively. The calculated solar fraction (SF) is 27.7% and 24.2% for cold greenhouse and warm greenhouse systems, respectively, as a result of the use of 20 m² surface area of flat plate collector (FPC). For the cold greenhouse system, simulations made with the same collector areas (20 m²) and different types of solar collectors (flat plate collector (FPC), evacuated tube solar collector (ETSC), and parabolic solar collector (PSC)) result in the lowest total annual energy consumption of the SAHP system for the as a result of the use PSC. And this enegy comsumption value is 3145.7 kWh / year, the result of the use of PSC.