Integrated Absorption Refrigeration Systems by Ibrahim Dincer & Tahir Abdul Hussain Ratlamwala

Author:Ibrahim Dincer & Tahir Abdul Hussain Ratlamwala
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Fig. 5.5Effects of strong solution concentration on energy and exergy COPs

Effects of ambient temperature

The variation in ambient temperature plays a significant role in the performance determination of systems relying extensively on heat transfer. The impact of the increase in ambient in temperature on the energy and exergy COPs of the TEARS is presented in Fig. 5.6. The energy COP is observed to remain constant at 1.458 and exergy COP is noted to increase from 0.40 to 0.84 with increase in ambient temperature from 280 to 300 K. The constant behavior of energetic COP reflects the importance of performing exergy analysis, because it is logical that the systems that rely on temperature difference are easily affected by any difference change in. The increasing behavior of exergetic COP with the increase in ambient temperature is because the increase in ambient temperature helps in decreasing the overall temperature difference from the system to the surrounding. As this overall temperature decreases, the thermal exergy loss from the system to the surrounding decreases and as a consequence of this phenomenon, the exergetic COP increases. Figure 5.7 displays the effects of the rise in ambient temperature on the exergoenvironmental impact factor and the exergoenvironmental impact coefficient. The exergoenvironmental impact factor and the exergoenvironmental impact coefficient are observed to decrease from 0.5 to 0.13 and 2.49 to 1.18, respectively, with an increase in ambient temperature from 280 to 300 K. The optimal value for the exergoenvironmental impact factor is zero which indicates that the system is completely environmentally neutral.

Fig. 5.6Effects of ambient temperature on energy and exergy COPs

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