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Membrane and Desalination Technologies - TCE Moodle Website

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416 K.C. Ng et al.<br />

CV2<br />

Condenser pressure<br />

Cooling<br />

water out<br />

Q latent<br />

ads ¼ msilica gel<br />

2. For the adsorbent bed in desorption operation<br />

3. For the condenser<br />

Hot<br />

water out<br />

Heat input Qdes Evaporator pressure<br />

CV1<br />

bed<br />

dqdes<br />

msilica gel ΔHads dt<br />

Hot<br />

water in<br />

Potable water (output)<br />

Chilled<br />

water out<br />

dq bed<br />

ads<br />

dt DHads: (16Þ<br />

Qdes ¼ _mcp des Thw;in Thw;o ; (17Þ<br />

Q latent<br />

des ¼ msilica gel<br />

Heat rejection<br />

Qcond bed<br />

dq<br />

m ads<br />

silica gel h fg<br />

dt<br />

Condenser<br />

Heat<br />

rejection<br />

Qads bed<br />

dq<br />

m ads<br />

silica gel ΔHads dt<br />

Evaporator<br />

Q chill<br />

Sea water feed<br />

Chilled<br />

water in<br />

Cooling<br />

water out<br />

Cooling<br />

water in<br />

Cooling<br />

water in<br />

Liquid<br />

refrigerant<br />

dqbed<br />

ads<br />

msilica gel h fg<br />

dt<br />

Fig. 9.14. Energy balance of AD system (Adapted from Saha et al. (42) <strong>and</strong> El-Sharkawy (25)).<br />

dq bed<br />

des<br />

dt DHads: (18Þ<br />

Qcond ¼ _mcp cond Tcw;o Tcw;in ; (19Þ

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