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Energies 2019, 12, 479 12 of 17 Table 5. Comparison of COP values between the R410A-based and the TC HPWHs. Simulations were carried out for a constant ∆TPP = 5 ◦C. HPWH Daikin (R410A) Sanyo (CO2) Daikin (R410A) Sanyo (CO2) Daikin (R410A) Sanyo (CO2) Daikin (R410A) Sanyo (CO2) T0 (◦ C) 24 24 24 24 27 27 27 27 Tw,in Tw,out (◦ C) (◦ C) 20 55 20 55 35 55 35 55 20 55 20 55 35 55 35 55 COP wel (kWh/kg) 4.4168 9.2061 × 10−3 4.7445 8.5702 × 10−3 4.0106 5.7929 × 10−3 3.7502 6.1951 × 10−3 4.8006 8.4701 × 10−3 5.0607 8.0348 × 10−3 4.3485 5.3427 × 10−3 3.9593 5.8679 × 10−3 The equal performance inlet temperature (EPIT) mentioned earlier could be observed in the more detailed breakdown of the dependence of the COP and specific electric consumption with water inlet temperature, as shown in Figures 8 and 9. In Figure 8, it can be noticed that the average slope of the decrease of the COP with the water inlet temperature was higher for the TC-HPWH than for the R410A-based HPWH. Consequently, there is a particular water inlet temperature for which the specific electric consumption is the same for both systems (EPIT). For water inlet temperatures above this point, the R410A-based HPWH has a better COP and a lower specific consumption, and, for lower water inlet temperatures, the TC-HPWH has the better performance. The EPIT will depend on ambient temperature, because T0 will determine the heat absorption pressure and, thus, the compression ratio. For the case of T0 = 24 ◦C, the EPIT is Tw,in = 29 ◦C, and, forthecaseofT0 =27◦C,itisTw,in =27◦C. Figure 8. HPWHs COP dependence on water inlet temperature Tw,in. Series obtained for constant Tw,out =55◦Cand∆TPP =5◦C.PDF Image | Comparison of Transcritical CO2 and Conventional Refrigerant Heat Pump
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