engleski

IMPACT OF REAL WORKING MEDIA PROPERTIES ON THE ENERGY CHARACTERISTICS OF A COMPRESSION HEAT PUMP

The aim of the work is to examine the possibility of applying spreadsheet calculator to a real thermodynamic process using the REFPROP base of thermodynamic properties for real fluids. The heating process of a real soil- to-water heat pump has been analysed. Thermodynamic process is shown in the respective comparative thermodynamic diagrams in order to clearly present the different properties of refrigerants and their impact on the energy characteristics of the heat pump. In the heating mode there is analysed how the changes in evaporation temperature of refrigerant at constant condensation temperature (and pressure) influence the unit workloads, cooling capacity, heat of condensation, temperature after compression, and the heating coefficient of a heat pump. Also, the energy characteristics of a heat pump using different refrigerants for the same temperature conditions are analysed. There are included the following refrigerants: propane, isobutane, rejected R12 and its environmentally friendly and widely accepted replacement R-134a, and for comparison ammonia as the most commonly used refrigerant. Results of the analysis are displayed in diagrams and tables and accompanied by necessary comments.

Heat pumps ; Thermodynamic process and diagrams ; REFPROP ; real refrigerants ; energy characteristics

nije evidentirano