An experimental investigation of a heat pump operating in the cooling mode for different refrigerants

In this study, the heat pump operating in the cooling mode were experimentally investigated at the outdoor temperatures between 25°C and 30°C for the refrigerating such as R134A, R404A, R407C and R410A. The experiments were performed in a laboratory with the dimensions of 6x4x3,8m. The experimental set-up consists of a semi-hermetic compressor, outdoor unit (condenser), indoor unit (evaporator), capillary-type expansion valve and four-way valve. The measuring instruments include data logger, thermocouples, manometers, energy meter and humidity meter. In order to maintain the desired indoor conditions, a humidification unit and heater are also used in the experiments. The experiments that were carried out with respect to the parameters such as refrigerant and outdoor air temperature were repeated three times in the controlled ambient conditions. By applying the first and second law of thermodynamics to the system, an energy and exergy analyses of the system were carried out by a computer code developed base on Engineering Equation Solver (EES-V9.172-3D)