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Title: A variable-capacity heat pump for renewable energy recovery
Author: Low, Robert E.
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1991
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This thesis describes research carried out by the author between 1986 and 1990 at the Department of Chemical Engineering, University of Edinburgh, under the supervision of Dr Colin Pritchard. The aim of the research was to devise and evaluate a novel compression heat pump cycle as a potential technology for the utilisation of work and heat from environmental sources in industrial applications. The principal requirement of such a heat pump is that it can accept time-varying inputs of work and heat whilst supplying a controlled heat load at constant delivery temperature to an external load. This requires a cycle with the ability to 'self-regulate' its capacity to match external variations in either energy input or energy takeoff. The use of a nonazeotropic mixture as working fluid offers the potential to vary the composition of circulating fluid in a heat pump cycle, thereby varying the capacity, and this was chosen as the basis for research. The prediction of thermodynamic properties of halogenated hydrocarbon refrigerants is reviewed with special emphasis on: acquisition of sufficient data for preliminary plant design from minimum information, and on the prediction of binary vapour-liquidequilibrium data (VLE) in the absence of experimental measurement. The Cubic Chain-Of-Rotators (CCOR) equation of state is assessed as a route to these properties; it is shown that this equation offers improved liquid-phase property prediction compared to other cubic equations of state. The CCOR equation is also shown (by comparison with experimental measurements from the literature) to predict binary VLE to the same degree of accuracy as the Redlick-Kwong-Soave, Lee-Kesler and Carnahan-Starling-DeSantis equations in the absence of any parameter optimisation. Procedures are described for the optimisation of the CCOR equations's performance as a predictor of both pure-fluid and mixture properties by the fitting of empirical parameters to experimental data. It is demonstrated that this optimisation procedure allows quantitative description of the liquid phase of pure fluids and of mixtures.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available