Abstract
In this study, the performance of a geothermal heat pump used in heating mode with different refrigerants was theoretically analyzed. The geothermal heat pump used in the evaluations has a evaporator capacity of 12.1 kW. In addition, the performance of the geothermal heat pump was investigated by using different refrigerants at variable evaporator temperatures in the system. Thermodynamic analysis was applied to the system using the HFC refrigerant types R 134a, R 143a, R 404A, R 407A, R 407C, R 410A, R 507 and SES36 refrigerants for the determined operating conditions of the geothermal heat pump. Solway Solkane 8.0 calculation program was used in the analyses. As a result of the analyses, the lowest working loads and the highest heating effect coefficient values for the same operating conditions were obtained from the system used R 134a, R 407a, R 407C and SES36 coolant fluids, respectively. Besides, it was determined that the refrigerant giving the highest pressure ratio value is SES36.
Highlights
The negative climate changes brought by the developing technology and industrialization, the use of air conditioning and cooling systems have become indispensable
The search for alternative fluids has accelerated in place of fluids that are harmful to the environment with the increasing concern about global warming
Fluids that will be considered as alternative fluids will be fluids with low global warming potential (GWP) and low ozone depletion potential (ODP)
Summary
The negative climate changes brought by the developing technology and industrialization, the use of air conditioning and cooling systems have become indispensable. These systems constitute approximately 9% of the world energy consumption. Due to the increase of environmental problems such as global warming, the refrigerants used in these systems are inevitable to be environmentally friendly. Fluids that will be considered as alternative fluids will be fluids with low global warming potential (GWP) and low ozone depletion potential (ODP). CFC (Chlorofluorocarbons) and HCFC (Hydrochlorofluorocarbons), which have high GWP and ODP values, have become more and more limited to use since they damage the ozone layer. HFC (Hydrofluorocarbons) refrigerants have been developed as an alternative to these refrigerants [1,2]
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