A Combined Organic Rankine Cycle-Heat Pump System for Domestic Hot Water Application

Collings, P., Al-Tameemi, M. and Yu, Z. (2016) A Combined Organic Rankine Cycle-Heat Pump System for Domestic Hot Water Application. In: 12th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Malaga, Spain, 11 - 13 Jul 2016, ISBN 9781775921240

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Abstract

This paper investigates a novel system to improve the efficiency of using natural gas for domestic heating. The exhaust from a gas burner powers a small-scale Organic Rankine Cycle (ORC) system using hexane as the working fluid, which is used to directly drive the compressor of a heat pump, using R134a as the working fluid. Water is heated from ambient by passing it through three heat exchangers, the condenser of the Heat Pump, the condenser of the ORC, and the secondary heat exchanger that is heated by the hot flue gas from the burner after it transfers the heat to the evaporator of the ORC subsystem. By using the heat generated from the burning of gas in a burner in this way, a fuel-to-usable-heat efficiency of up to 160% is projected, outperforming the other technologies discussed, giving it the potential to significantly reduce energy demand and carbon emissions. This paper investigates the effect of varying ambient conditions upon the cycle, namely the temperature of ambient air, which has a strong effect on the performance of the heat pump.

Item Type:Conference Proceedings
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Collings, Mr Peter and Al-Tameemi, Mr Mohammed and Yu, Professor Zhibin
Authors: Collings, P., Al-Tameemi, M., and Yu, Z.
Subjects:T Technology > TJ Mechanical engineering and machinery
College/School:College of Science and Engineering > School of Engineering
College of Science and Engineering > School of Engineering > Systems Power and Energy
Research Group:System Power and Energy
ISBN:9781775921240
Copyright Holders:Copyright © 2016 The Authors
First Published:First published in 12th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics Proceedings 2016
Publisher Policy:Reproduced with the permission of the Editor
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
642241Investigating zeotropic mixtures as working fluids for high efficiency Organic Rankine Cycle (ORC) power plantsZhibin YuRoyal Society (ROYSOC)RG130051ENG - ENGINEERING SYSTEMS POWER & ENERGY
684301Dynamic Organic Rankine Cycle for Recovering Industrial Waste HeatZhibin YuEngineering & Physical Sciences Research Council (EPSRC)EP/N005228/1ENG - ENGINEERING SYSTEMS POWER & ENERGY