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Constant total pressure evaporation with heat reuse by a built‐in engine
Author(s) -
Cheng ChenYen,
Cheng SingWang
Publication year - 1967
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690130323
Subject(s) - evaporator , evaporation , boiling , condensation , thermodynamics , reuse , boiling point , chemistry , constant (computer programming) , waste management , engineering , heat exchanger , organic chemistry , computer science , physics , programming language
A new way of promoting a nonspontaneous process, namely, a built‐in engine, is introduced showing that a process with a large temperature coefficient of free energy change [that is, d (Δ G ) T , P / dT ] can be utilized to promote a nonspontaneous process which has a small temperature coefficient of free energy change. When such a built‐in engine is incorporated into an evaporating system, heat reuse in the system can be obtained under a constant total pressure condition. An auxiliary system consisting of two organic substances which are partially miscible in a certain temperature range and have a critical solution temperature can be used to serve as a built‐in engine. One substance is added to the boiling mass of an evaporator to lower its boiling temperature, and the other is added to the condensing side to raise the temperature of the condensing mass. Heat of condensation can be effectively utilized in evaporating the boiling mass. Regeneration of the auxiliary system is achieved by taking advantage of the solubility gap.