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M Pitarch-Mocholi, E Navarro-Peris, J Gonzalvez-Macia, JM Corberan / 12th IEA Heat Pump Conference (2017) O.1.9.3 Figure 2: Heat Pump subcooling controlled by a throttling valve a) Scheme, b) P-h diagram. 3. Numerical Model For the prediction of the heat pump performance, the commercial IMST-ART software were used [22]. It is a heat pump modelling software which main features are fast calculation and accurate evaluation of the refrigerant units. The model incorporates a number of sub-models representing the different parts of the heat pump: compressor, condenser, evaporator and expansion valve, the definition of these components are based on the geometric characteristics of them and for compressors the common information supplied by manufacturers. The calculations are based on steady state conditions. For more detailed description of the model see [23]. Table 1 shows the main components of both systems. The compressor is scroll type and it is modelled by the AHRI coefficients provided by the manufacturer. The heat exchangers (HXs) are modelled by introducing the type of HX (Plate), the size (height and width), the plate pitch, the number of plates, the HX material, etc. The expansion valve is modelled as an isenthalpic pressure drop in order to fulfil the desired superheat, in this case 10K. The throttling valve cannot be modelled, but the subcooling can be introduced as a parameter, so in practice the HP making subcooling in the condenser can be modelled with the IMST-ART software. Table1: Components of the HP system Component Compressor Condenser Subcooler Evaporator Liquid Receiver Expansion Valve Throttling Valve Type Scroll (2900 rpm) BPHE Counterflow BPHE Counterflow BPHE Counterflow - Electronic EV Electronic EV Size 29.6 m3h-1 3.5 m2 0.87 m2 6m2 7l 5–60kW 5–60kW The heating COP calculation does not take into account the consumption of the auxiliary components unless it is indicated. 5PDF Image | Comparative analysis of two subcritical heat pump boosters using subcooling
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