Fig nbsp xA Exergetic efficiency and
Fig. 7(c) shows the total thermal conductance in the evaporator ((KA)total) with the evaporating temperature (Teva) for different GWITs (Tgw,in). Apparently, as shown in the figure, (KA)total exhibits the similar variation trend with (KA)con, i.e., (KA)total decreases with Teva, but the change rate (∂((KA)con)/∂Teva) at different evaporating temperature are different. The rate ∂((KA)total)/∂Teva can be approximately regarded as constant for Teva ≤ Teva,opt and Teva ≥ Teva,opt, coincidently, ∂((KA)total)/∂Teva for Tgw,in investigated in this GDC-0449 paper are almost the same. Moreover, ∂((KA)total)/∂Teva for Teva ≤ Teva,opt is higher than that for Teva ≥ Teva,opt. From Eq. (36), (KA)total is determined by (KA)con and (KA)eva. It can be evidently seen from Fig. 7(a) and (b) that (KA)con is much higher than (KA)eva due to the pretty smaller temperature difference in the condenser. So (KA)total is dependent on (KA)con, and dictyosomes is the reason why (KA)total and (KA)con presented the similar variation rules. For Teva ≥ Teva,opt, compared with ΔTcon and ΔTeva, Qc and Qc are both sharply declined due to the increasing of Tgw,out, i.e., the evident decrease in the thermal load is a main contributor the (KA)total. (KA)total ranges from 900.8 for Tgw,in = 90 °C to 2114.8 (kW/°C) for Tgw,in = 120 °C. An increase of 5 K in Tgw,in results in an increase of 202.3 (kW/°C) in (KA)total.