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Advances in High-Temperature Heat Pumps
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Advances in High-Temperature Heat Pumps

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

Deadline for manuscript submissions: closed (5 July 2023) | Viewed by 9237

Special Issue Editor

Dr. Jian Sun

E-Mail Website
Guest Editor
School of Energy Power and Engineering, North China Electric Power University, Beijing 102206, China
Interests: heat pump; heat recovery; industrial energy; building energy; multi-energy system; HVAC

Special Issue Information

Dear Colleagues,

Low-carbon energy-saving technology is a key research direction in the international energy field. Heat pump technology, as an energy-saving and emission-reducing measure, has been widely used in industrial and HVAC fields. Conventional heat pumps are limited by the thermodynamic cycle, circulating the working medium and the operating range of compressors, resulting in limited heating temperature, which cannot meet the demand for high-temperature heating in industrial and civil fields. High-temperature heat pump technology research has become the key direction of global research in related fields. High-temperature heat pumps can be applied to industrial steam and hot water supplies, efficient renewable energy consumption, energy storage coupling, and low-carbon heating. The Special Issue, named “Advances in High-Temperature Heat Pumps”, aims to publish research on new cycles, principles, refrigerants, and applications for industries and residents with high-temperature heat pumps.

Dr. Jian Sun
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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.

Keywords

  • absorption heat pump
  • compression heat pump
  • thermal cycles
  • principle methods
  • refrigerants
  • renewable energy utilization
  • energy storage
  • heat recovery
  • industrial applications
  • HVAC

Published Papers (3 papers)

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Research

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21 pages, 2941 KiB  
Article
Design for a Heat Pump with Sink Temperatures of 200 °C Using a Radial Compressor
by Julian Unterluggauer, Verena Sulzgruber, Clemens Kroiss, Johannes Riedl, Reinhard Jentsch and Reinhard Willinger
Energies 2023, 16(13), 4916; https://doi.org/10.3390/en16134916 - 24 Jun 2023
Cited by 1 | Viewed by 3550
Abstract
To reduce CO2 emissions in the industrial sector, high-temperature heat pumps are a key technology. This work presents an approach to design such an industrial heat pump system capable of supplying 200 °C sink temperature and a capacity of approximately 1 [...] Read more.
To reduce CO2 emissions in the industrial sector, high-temperature heat pumps are a key technology. This work presents an approach to design such an industrial heat pump system capable of supplying 200 °C sink temperature and a capacity of approximately 1 MW. Today’s market-available heat pumps using displacement compressors are not suitable for reaching that high sink temperatures as they need lubricating oil, which is not temperature resistant enough. As a consequence, in this study a transcritical heat pump cycle using a two-stage oil-free radial compressor is investigated. Based on preliminary studies, R1233zd(E) is chosen as a refrigerant. The procedure couples 1D thermodynamic cycle simulations with a radial compressor mean-line design model. A preliminary geometry for a compressor with and without inlet guide vanes is presented, and compressor maps including the compressors behaviour in off-design are calculated. The compressor design is then imported into a 1D simulation to analysis the performance of the heat pump in the whole operating range. In the analysis, the application of a fixed inlet is evaluated, and an improvement of approximately 21% and 16% of the isentropic efficiency is achieved. The thermodynamic simulations showed a maximum COP of approximately 2.8 and a possible operating range of 0.5 to 1.3 MW thermal power. Furthermore, a techno-economical analysis by means of a deep-fryer use case showed reasonable payback times of between 2 and 10 years, depending on the electricity to gas price ratio. Full article
(This article belongs to the Special Issue Advances in High-Temperature Heat Pumps)
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15 pages, 4582 KiB  
Article
Cycle Characteristics of a New High-Temperature Heat Pump Based on Absorption–Compression Revolution
by Jian Sun, Yu Qin, Ran Liu, Guoshun Wang, Dingqun Liu and Yongping Yang
Energies 2023, 16(11), 4267; https://doi.org/10.3390/en16114267 - 23 May 2023
Viewed by 1408
Abstract
A large amount of the waste heat generated during industrial production is not used, which leads to a low energy utilization rate. The recovery of industrial waste heat using heat pumps has the advantages of low energy consumption, high efficiency, safety, and environmental [...] Read more.
A large amount of the waste heat generated during industrial production is not used, which leads to a low energy utilization rate. The recovery of industrial waste heat using heat pumps has the advantages of low energy consumption, high efficiency, safety, and environmental protection. Industrial waste heat has a wide temperature distribution range. Traditional absorption and compression heat pumps can only work in a narrow temperature range due to the thermodynamic cycle, the thermal properties of the working medium, the temperature and pressure resistance of the compressor, and other factors; they cannot simultaneously meet the requirements of a “high heating temperature” and “wide temperature-range heat transfer”. To solve the above problems, this paper proposes a high-temperature heat pump unit based on a coupled cycle of absorption and compression, which can recover low-temperature steam and 50 °C waste heat and produce hot water at 110–130 °C. EES software is used for the mathematical modeling and simulation analysis of the heat pump unit. The results show that, when the driving steam temperature is 140 °C and the waste heat temperature is 50 °C, the heating temperature can reach 110~130 °C and the COP of the system can reach 4.22. Increasing the waste heat outlet temperature and the condensation temperature of the absorption cycle strengthens the COP of the coupled cycle; meanwhile, increasing the evaporation temperature and heating temperature of the absorption cycle reduces the COP of the coupled cycle. The results of this study significantly broaden the operating temperature range and heating temperature of electric heat pumps; our findings therefore have essential research significance for improving energy efficiency in industrial fields. Full article
(This article belongs to the Special Issue Advances in High-Temperature Heat Pumps)
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Review

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18 pages, 3152 KiB  
Review
A Review of Super-High-Temperature Heat Pumps over 100 °C
by Jian Sun, Yinwu Wang, Yu Qin, Guoshun Wang, Ran Liu and Yongping Yang
Energies 2023, 16(12), 4591; https://doi.org/10.3390/en16124591 - 8 Jun 2023
Cited by 3 | Viewed by 3792
Abstract
The high-temperature heat pump, as a low-carbonization technology, has broad application prospects in replacing boiler heating, reducing carbon dioxide emissions, and improving the energy utilization efficiency. In this paper, the working fluid, cycle process, key equipment (compressor), and application scenarios of high-temperature heat [...] Read more.
The high-temperature heat pump, as a low-carbonization technology, has broad application prospects in replacing boiler heating, reducing carbon dioxide emissions, and improving the energy utilization efficiency. In this paper, the working fluid, cycle process, key equipment (compressor), and application scenarios of high-temperature heat pumps are introduced in detail. Firstly, the research direction of the working fluid is introduced and the existing working fluid substitution is analyzed and summarized. Then, the characteristics of different heat pump cycles such as compression, absorption, and hybrid heat pumps are introduced. In the aspect of key equipment, the application range and research status of different types of compressors are emphatically introduced. Finally, the application scenario of high-temperature heat pumps is prospected. In addition to the application of industrial heating, it is often used for heat storage to improve the regulatory characteristics of the system. The new heat pump electricity storage system has great application potential in the field of renewable energy consumption. Based on the above analysis of high-temperature heat pumps, four development prospects are put forward: low-Global-Warming-Potential (GWP) working fluid; cycles of temperature lift greater than 80 °C; a compressor with better high-temperature performance; and circulation characteristics of heat pump electricity storage. Full article
(This article belongs to the Special Issue Advances in High-Temperature Heat Pumps)
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