Theoretical energy and exergy analyses of solar assisted heat pump space heating system

Abstract

Due to use of alternative energy sources and energy efficient operation, heat pumps come into prominence in recent years. Especially in solar-assisted heat pumps, sizing the required system is difficult and arduous task in order to provide optimum working conditions. Therefore, in this study solar assisted indirect expanded heat pump space heating system is simulated and the results of the simulation are compared with available experimental data in the literature in order to present reliability of the model. Solar radiation values in the selected region are estimated with the simulation. The case study is applied and simulation results are given for Antalya, Turkey. Collector type and storage tank capacity effects on the consumed power of the compressor, COP of the heat pump and the overall system are estimated with the simulation, depending on the radiation data, collector surface area and the heating capacity of the space. Exergy analysis is also performed with the simulation and irreversibility, improvement potentials and exergy efficiencies of the heat pump and system components are estimated.

Fault diagnosis for a solar assisted heat pump system under incomplete data and expert knowledge

“…On the condenser, the working fluid releases heat to the space heating water, which is ready for the users. Finally, the refrigerant enters into the expansion valve and transported to the evaporator afterward [43]. [7,10].…”

The logging waste as inexhaustible resource for alternative energy

“…In recent year prescribed cut on the average on North-West region is used by about 43% and in the Leningrad Region by 50%. This volume of harvesting residuals content energy comparable with energy from other alternative sources -wind, hydro, and solar [5,6].…”

Mathematical Thermal Modelling of a Direct-Expansion Solar-Assisted Heat Pump Using Multi-Objective Optimization Based on the Energy Demand

“…Following his work, several studies have been conducted, such as the ones by Mehdaoui [21], Bridgeman [22], DeGrove [23], Khalaf [24], Fu [25], Kamel [26] and Youssef [27]. Alternatively, several authors developed and proposed mathematical models of the system employing a more robust approach where every process of the heat pump cycle was modelled separately and then connected to simulate and quantify the performance of the HP in terms of COP and collector efficiency such as Sterling et al [28], Li et al [29], Çaglar et al [30], Kokila et al [31] and Gorozabel-Chata et al [32], in terms of exergy destruction and second law of thermodynamics, by Atmaca et al [33] and Torres-Reyes et al [34] respectively, and based on worktime and flow resistance in the collectors such as the one proposed by Chyng et al [35]. One particular study is the one published by Chow et al [36] where they set out a comprehensive model centered on the effect the atmospheric conditions have on the yearly performance of the heat pump, employing a 25 years period database of the typical meteorological months.…”

“…The thermal capacity, Equation (33), establishes the ratio between the capability the heat pump has to transfer energy to a given volume of product and the minimal thermal energy said volume requires to reach and maintain the desired outlet temperature. A minimum thermal capacity of 1 is desired under any circumstance throughout the selected time lapse, as it asserts that the heat pump will work with a satisfactory performance, absorbing more heat from the environment than the required by the water, even on days with disadvantageous conditions such as low ambient temperature or low normal radiation.…”