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

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

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