Design strategies and control methods for a thermally driven heat pump system based on combined cycles

Al-Tameemi, M. R. J., Laing, Y. and Yu, Z. (2019) Design strategies and control methods for a thermally driven heat pump system based on combined cycles. Frontiers in Energy Research, 7, 131. (doi: 10.3389/fenrg.2019.00131)

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Abstract

Heating sector is one of the key emitters of greenhouse gases, and thus innovations are needed to improve the energy efficiency of heating technologies. In this paper, a recently proposed gas powered heating system that integrates an Organic Rankine Cycle (ORC) with a heat pump has been further investigated. Two different designs of the combined system were modeled, and their performances were compared and analyzed. In the first design, the cold water is firstly heated in the heat pump condenser and then further heated in the ORC condenser to achieve the required final temperature. In the second design, the water is firstly heated in the ORC condenser and then further heated in the heat pump condenser. The results showed that the first design can achieve better overall fuel-to-heat efficiency. Using Aspen Plus, a dynamic model has then been developed to study the optimal control strategies for this design when ambient conditions change. The results revealed that, for the ambient temperature range of 7–15°C, increasing air mass flow rate is sufficient to maintain the overall system performance. While when ambient temperature is below 7°C, more heat is required from the gas burner that would reduce the fuel-to-heat efficiency.

Item Type:Articles
Additional Information:The author Mohammed Ridha Jawad Al-Tameemi acknowledges University of Diyala / Iraqi Ministry of Higher Education and Scientific Research sponsorship (No. 1214).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Al-Tameemi, Mr Mohammed and Yu, Professor Zhibin
Authors: Al-Tameemi, M. R. J., Laing, Y., and Yu, Z.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Frontiers in Energy Research
Publisher:Frontiers Media
ISSN:2296-598X
ISSN (Online):2296-598X
Copyright Holders:Copyright © 2019 The Authors
First Published:First published in Frontiers in Energy Research 7:131
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
172394Thermally Driven Heat Pump Based on an Integrated Thermodynamic Cycle for Low Carbon Domestic Heating (Therma-Pump)Zhibin YuEngineering and Physical Sciences Research Council (EPSRC)EP/N020472/1ENG - Systems Power & Energy
300273An ORC power plant integrated with thermal energy storage to utilise renewable heat sources for distributed H&PProject Number; 102883Zhibin YuEngineering and Physical Sciences Research Council (EPSRC)EP/R003122/1ENG - Systems Power & Energy
171763Dynamic Organic Rankine Cycle for Recovering Industrial Waste HeatZhibin YuEngineering and Physical Sciences Research Council (EPSRC)EP/N005228/1ENG - Systems Power & Energy