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Heat Pumps Using Low-GWP Refrigerants 2022

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "J: Thermal Management".

Deadline for manuscript submissions: closed (30 June 2023) | Viewed by 2629

Special Issue Editors


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Guest Editor
Buildings and Transportation Science Division, Oak Ridge National Laboratory, 1 Bethel Valley Rd, Oak Ridge, TN 37830, USA
Interests: developing sustainable technologies for heating, cooling, refrigeration, water heating, and atmospheric water harvesting; application of classical and statistical thermodynamics to understand and describe separation and material extraction processes
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E-Mail Website
Guest Editor
Buildings and Transportation Science Division, Oak Ridge National Laboratory, 1 Bethel Valley Rd, Oak Ridge, TN 37830, USA
Interests: refrigeration; low global warming potential refrigerants; transport properties of refrigerants

Special Issue Information

Dear Colleagues,

Heat pumps play a vital role in providing space conditioning and water heating while utilizing the energy of the environment. Since heat pumps use renewable thermal energy from the environs to provide the desired utility, they contribute to the portfolio of technologies that mitigate the carbon footprint. An air source heat pump utilizes the air as a medium of energy exchange. A ground source heat pump utilizes the ground as a reservoir for thermal exchange, and similarly, a water source heat pump uses a body of water as the source or sink of energy. The heat pump may be considered a truly renewable technology if the electricity it uses comes entirely from a renewable source. More accurately, a heat pump is a “low carbon technology”. These perspectives make a heat pump an indispensable option for the future to reduce the debilitating human impact on the environment. More efficient heat pumping technologies are being developed for the residential, commercial, industrial, and medical sectors of the economy. Another research and development thrust are heat pumps for cold climates. Hardware components, use of low-global warming potential (GWP) refrigerants, and identification of systemic inefficiencies are active research areas.

This Special Issue invites high-quality research papers covering a wide range of topics related to multifunctional heat pumps, low-GWP and drop-in replacement refrigerants, applications to different climates and renewable energy sources, and systemic analysis. The articles are expected to inform on how to encourage development of sustainable technologies to mitigate climate change and help to meet or exceed the goals of the climate accords by providing practical solutions in the near term.

Dr. Moonis Raza Ally
Dr. Brian Fricke
Guest Editors

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Keywords

  • heat pumps
  • integrated heat pumps
  • low-gwp refrigerants
  • water heating
  • space conditioning
  • refrigeration
  • solar-assisted heat pumps
  • vapor compression systems
  • thermally driven heat pumps

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Published Papers (1 paper)

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Research

15 pages, 3678 KiB  
Article
CFD Analysis of Heat Transfer Enhancement in a Flat-Plate Solar Collector/Evaporator with Different Geometric Variations in the Cross Section
by William Quitiaquez, José Estupiñán-Campos, César Nieto-Londoño and Patricio Quitiaquez
Energies 2023, 16(15), 5755; https://doi.org/10.3390/en16155755 - 2 Aug 2023
Cited by 3 | Viewed by 1744
Abstract
There is a growing demand from the industrial sector and the population to cover the need for water temperature increases that can be covered with systems such as heat pumps. The present research aims to increase the heat transfer to the working fluid [...] Read more.
There is a growing demand from the industrial sector and the population to cover the need for water temperature increases that can be covered with systems such as heat pumps. The present research aims to increase the heat transfer to the working fluid in a collector/evaporator, part of a solar-assisted direct expansion heat pump. This research was developed using a numerical analysis and by applying computational fluid dynamics; different simulations were performed to compare the performances of collector/evaporators with models exhibiting variations in the cross-section profile under similar conditions. An average incident solar radiation of 464.1 W·m−2 was considered during the analysis. For the comparison, profiles with hexagon-, four-leaf clover-, and circular-shaped sections with floral shapes, among others, were analysed, resulting in a temperature increase at the outlet of the working fluid of 1.3 °C. In comparison, the collector/evaporator surface temperature varied between 4 and 13.8 °C, while the internal temperature of the fluid reached 11.21 °C. Finally, it is indicated that the best results were presented by analysing the profile corresponding to the circular section with the flower shape. Full article
(This article belongs to the Special Issue Heat Pumps Using Low-GWP Refrigerants 2022)
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