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No assumptions regarding the compressor could be made for R450A and R513A, because of the limited access to data. For this reason, the analysis of these two refrigerants is left for the future steps of the work. Concerning the volumetric efficiency of the compressor (ηs), another correlation was elaborated. The value for the swept volume (𝑉̇ ) was available for the specific compressor at the given operating 𝑠𝑤𝑒𝑝𝑡 conditions (50 Hz or 3000 rpm) on the Emerson online software (Emerson climate technologies, 2015) and equals to 6.93 m3/h (0.001925 m3/s). The relation between the mass flow of the refrigerant and the volumetric efficiency is given by equation (3.19) (Ekroth, 2011): ̇ 𝑚̇ =𝜌∗𝑉 ∗𝜂 𝑟𝑒𝑓 2 𝑠𝑤𝑒𝑝𝑡 𝑠 (3.19) Where 𝑚̇ 𝑟𝑒𝑓 is the mass flow of refrigerant in kg/s, 𝜌2 the density of the refrigerant in point 2 of the cycle in kg/m3, 𝑉̇ the swept volume in m3/s and 𝜂 the volumetric efficiency of the compressor. 𝑠𝑤𝑒𝑝𝑡 𝑠 With the other data (𝑚̇ 𝑟𝑒𝑓 and 𝜌2) issued from the model, 𝜂𝑠 could be calculated for each point, and related to the corresponding pressure ratio, thus obtaining the correlation seen in (3.20). 3.1.4. Condenser The condenser used is the H62L-CX, micro-plate heat exchanger. The typical temperature profile in a condenser is observed in Figure 3.5. Figure 3.5. Temperature profiles of water and refrigerant in the condenser On the water side the water comes in at TW,in and leaves at TW,out. Two other main temperatures are identified, TW’’ corresponding to the crossing of saturated vapour line on the refrigerant side at the 𝜂 =0.0015∗𝑃 2 −0.0356∗𝑃 +1.0583 𝑠 𝑟𝑎𝑡𝑖𝑜 𝑟𝑎𝑡𝑖𝑜 (3.20) -27-PDF Image | Next generation of refrigerants for residential heat pump systems
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