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3. Analysis of the developed model The product considered in the scope of the testing is a commercial model available in the market as the representative of domestic heat pump installed in a Swedish single family house, with 10 kW heating capacity. The modelling of the said heat pump has been conducted in the EES software, an equation solver tool able to solve systems of thousands of non-linear equations. Its major feature and main reason for its choice is the fact that it contains all the thermodynamic properties of the major refrigerants and comprises an extensive library of correlations. In order to evaluate the indirect effect that has to be kept into account while calculating the TEWI, the SCOP is obtained from the model. 3.1. Heat pump model The components of the system are illustrated in Figure 3.1; the pumps for the secondary fluids are not considered. Expansion valve Condenser Evaporator Figure 3.1. Heat pump system Compressor The evaporator and the condenser are plate heat exchangers, the compressor is hermetic scroll type and the expansion valve is thermostatic. The secondary fluids are brine in the evaporator (mixture of water and ethyl alcohol at fixed concentration of 29%) and water in the condenser. In order to understand how some of the parameters that will be used in the comparative analysis between the alternative refrigerants are defined, an overview of their expression will be given hereby. In Figure 3.2 the basic vapour compression cycle – followed by the HP considered – is represented in the pressure-enthalpy (left) and temperature-entropy (right) diagrams. From 1 to 2 the evaporation of -21-PDF Image | Next generation of refrigerants for residential heat pump systems
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