A competitive study of a geothermal heat pump equiped with an intermediate economizer for R134a and R513A working fluids

Abstract

At temperatures below 60?C, the best way to use geothermal sources for heating is to use heat pumps. A heat pump can provide air conditioning for a residential, commercial, etc., all year round by heating in winter and cooling in summer using a low-temperature source. Also, a heat pump can be used for water distillation through evaporation. The ground source heat pump with a high COP and low-temperature thermal energy sources is one of the best technologies for using renewable energy sources. In the present study, the effects of changing ambient temperature and soil temperature on a heat pump's overall COP and energy efficiency are investigated using a simulated geothermal heat pump with an economizer. The system's thermodynamic simulation is first performed in the EES software for R134a and R513A working fluids. The exergy destruction of different components for both working fluids was calculated and displayed as a figure. COP of the heat pump for R134a working fluid is equal to 3.916, equal to 3.729 for R513A working fluid, which indicates that R134a fluid has about 5% better performance. COP of the system for R134a working fluid is equal to 3.662, which is equal to 3.504 for R513A working fluid, which indicates that R134a fluid has about 4.5% better performance.

Analysis of an earth‐to‐air heat exchanger for enhanced residential thermal comfort

“…Aryanfar et al 18 and Aryanfar and Alcaraz 19 examined how varying ambient temperature and soil temperature impacted the Coefficient of Performance (COP) and energy efficiency of a geothermal heat pump equipped with an economizer for winter heating. They noted that the COP and energy efficiency of the geothermal heat pump were not influenced by changes in the ambient temperature.…”