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5 – Experimental Results The relative heat loss for the compressor is defined as the ratio between the heat loss from the compressor shell and the compressor power input. Figure 5.44 displays the estimated relative heat loss as a function of the pressure ratio. The operating conditions were the same as in Figure 5.42, and the calculations were performed by using the previously described measuring values as well as the discharge gas temperatures. 30 25 20 15 10 ∆Q = 4.3976·π + 8.6592 2.5 2.7 2.9 3.1 3.3 3.5 Pressure Ratio, π [-] Figure 5.44 The estimated relative heat loss from the prototype com- pressor as a function of the pressure ratio at constant inlet conditions (approximately 3.046 MPa, -2.5oC). The relative heat loss, which ranged from about 17 to 24%, should only be regarded as a rough estimate due to the large uncertainty in the oil discharge rate. The lower solid-drawn line represents the estimated rela- tive heat loss at zero oil discharge rate. The relatively large heat loss was partly a result of the cooling effect of a small fan, which was installed in order to keep the shell temperature below the maximum allowable level. 5.1.3.7 Evaporator Performance Heat Transfer Efficiency The tube-in-tube evaporator was not instrumented for measuring the local heat transfer coefficient for the flow boiling CO2. However, by using the temperature and pressure measurements at the inlet and outlet of the evaporator as well as the measured mass flow rates of the CO2 and the brine, it was possible to estimate the inlet vapour fraction, the evaporator capacity, the LMTD and consequently the mean overall heat transfer coefficient (U-value) at varying operating conditions. With reference to 150 Relative Heat Loss, ∆Q [%]PDF Image | Residential CO2 Heat Pump System for Combined
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