CHEN 4501W Lecture Notes - Lecture 37: Sith, Bombardier Dash 8, European Route E20
28 Nov 2015
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Fcp = 5 kw/c negative means we"re taking heat out of the stream (cooling process) 70 c can make these 2 streams exchange heat capital costs on 1 exchanger, save on utilities, operating costs are none (free) consider exchanging heat between streams. 200 c, fcp = 5 heat exchanger additional cooling. We need to specify, t1, t2, size of h. e. (heat exchanger) and extra utilities. The best we could do is bring t1 to 100 (need to always keep driving force) on other side, it"s ok. For maximum heat exchange (keeping thot > tcold in he) => t_2=125 c with q = 500 kw transferred between streams need some additional heating and cooling on both sides really, t1 > 100 b/c will take infinite time to become same t as 100 c. 200 kw enthalpy is not absolutedepends on reference so this axis is arbitrary. Heat available in stream, h --> 1st law of thermodynamics.
