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Processes
Special Issues
Application of Refrigeration and Heat Pump Technology
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Application of Refrigeration and Heat Pump Technology

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Energy Systems".

Deadline for manuscript submissions: 30 June 2025 | Viewed by 3522

Special Issue Editor

Dr. Alireza Zendehboudi

E-Mail Website
Guest Editor
Department of HVAC Engineering, Aibel AS, Hagaløkkveien 28, 1383 Asker, Norway
Interests: modeling and analysis of thermal systems; heat pumping, air conditioning and refrigeration technologies; refrigerant and working fluids

Special Issue Information

Dear Colleagues,

Developing eco-friendly alternative systems and refrigerants, while also enhancing the energy efficiency of HVAC&R systems, is imperative for addressing climate change and reducing energy consumption. With this in mind, this Special Issue on the "Application of Refrigeration and Heat Pump Technology" seeks to delve into and present the latest research on energy-saving and eco-friendly heating and cooling technologies. The Guest Editor invites contributions from academics, researchers, and professional engineers working on various aspects related to the design, development, implementation, and optimization of heating and cooling systems.

The focus of this Special Issue is the increasing demand for energy-efficient solutions to meet heating and cooling needs, considering the challenges posed by climate change and the necessity of reducing greenhouse gas emissions. The Guest Editor welcomes the submission of original research articles and critical review articles encompassing a wide range of topics, including, but not limited to, the following:

  • Progress in heat pump and refrigeration configurations and components.
  • Working fluids for heat pump and refrigeration systems.
  • District cooling and heating, supermarket refrigeration, space- and hot-water heat pump heaters, and other areas.
  • The development of high-temperature and industrial heat pump technologies.
  • The incorporation of energy storage solutions in HVAC&R.
  • The use of renewable energy sources and energy recovery methods with innovative HVAC&R technologies.

Dr. Alireza Zendehboudi
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. Processes is an international peer-reviewed open access monthly 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 2400 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

  • heat pump
  • refrigeration
  • air conditioning
  • environmentally friendly refrigerants
  • heat exchanger design
  • energy storage
  • waste heat recovery
  • integrated system design and application of renewable energy in HVAC&R

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  • Greater discoverability: Special Issues support the reach and impact of scientific research. Articles in Special Issues are more discoverable and cited more frequently.
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Further information on MDPI's Special Issue policies can be found here.

Published Papers (4 papers)

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Research

19 pages, 8687 KiB  
Article
Research on the Effect of Damping Grooves on the Pressure and Cavitation Characteristics of Axial Piston Pumps
by Ruichuan Li, Dongrun Li, Zhengyu Li, Tong Wu and Jikang Xu
Processes 2025, 13(5), 1274; https://doi.org/10.3390/pr13051274 - 22 Apr 2025
Viewed by 144
Abstract
The damping groove structure of the port plate plays a crucial role in the pulsation suppression, vibration reduction, and noise optimization of the piston pump. Different damping groove structures have a significant impact on the flow distribution process during the normal operation of [...] Read more.
The damping groove structure of the port plate plays a crucial role in the pulsation suppression, vibration reduction, and noise optimization of the piston pump. Different damping groove structures have a significant impact on the flow distribution process during the normal operation of the port plate, affecting the pump outlet flow and pressure pulsations, which in turn influence the noise level of the piston pump. Therefore, the damping groove in the piston pump is one of the key structures influencing the pump’s pressure and cavitation behavior. To address the pressure shocks and oscillations caused by the distribution process in the piston pump, this study proposes a novel damping groove and performs CFD simulations on the non-damped groove. The analysis focuses on the pressure pulsation characteristics in the plunger chamber and the cavitation behavior of the pump. Additionally, an optimization analysis of the structural parameters of the new damping groove is conducted, which effectively reduces pressure shocks and cavitation in the swash plate axial piston pump. This study provides a theoretical foundation for improving the performance and lifespan of piston pumps. Full article
(This article belongs to the Special Issue Application of Refrigeration and Heat Pump Technology)
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21 pages, 3371 KiB  
Article
Modeling of a Novel Cascade Cycle for the Simultaneous Production of Desalinated Water and Cooling Using Various Refrigerants
by Javier Delgado-Gonzaga, Wilfrido Rivera, José Camilo Jiménez-García, Alejandro Pacheco-Reyes and David Juárez-Romero
Processes 2025, 13(1), 166; https://doi.org/10.3390/pr13010166 - 9 Jan 2025
Viewed by 617
Abstract
This study proposes a cogeneration system for the simultaneous production of cooling and freshwater. A double-stage cascade compression cooling system consists of two interconnected vapor compression cycles. The proposed system integrates a double-stage cascade compression cooling system with a water desalination unit, which [...] Read more.
This study proposes a cogeneration system for the simultaneous production of cooling and freshwater. A double-stage cascade compression cooling system consists of two interconnected vapor compression cycles. The proposed system integrates a double-stage cascade compression cooling system with a water desalination unit, which takes advantage of the heat released by the cascade system. The system performance was evaluated using various refrigerants selected based on their energy efficiency, environmental impact, and widespread use. Multiple combinations of the fluids were used in the high-temperature cycle (HTC) and low-temperature cycle (LTC) to analyze their impact on system performance. A parametric analysis was conducted by developing a mathematical model in MATLAB. The model’s input parameters were the evaporation temperature and the temperature difference between the inlet and discharge of both compressors (ΔLTC and ΔHTC). System performance was assessed from a first-law point of view through the coefficient of performance (COP), the energy utilization factor (EUF), and the gain output ratio (GOR). The results revealed that the maximum (105 °C) and minimum (−13 °C) temperatures, essential for desalination and cooling, respectively, were achieved using R134a in the LTC and R123 in the HTC, with ΔLTC = 65 °C and ΔHTC = 70 °C. However, the best performance was observed with R123 in both cycles, with ΔLTC = 45 °C and ΔHTC = 70 °C. This configuration achieved a COP of 1.06, a GOR of 1.61, and an EUF of 2.74. Full article
(This article belongs to the Special Issue Application of Refrigeration and Heat Pump Technology)
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14 pages, 3633 KiB  
Article
Determination of Pressure Jump Dependence and Time Constants of Hydraulic Pumps with Constant Pressure and Variable Flow
by Maja Anđelković, Radovan Petrović, Ivana Ilić, Vladan Pantović and Jelena Grujić
Processes 2024, 12(12), 2761; https://doi.org/10.3390/pr12122761 - 4 Dec 2024
Viewed by 906
Abstract
Simulations of the pump response time refer to the determination of the time constant of the transient process when the flow and pressure change. The changes mentioned in the standards are precisely defined and prescribed by the “MIL-P-19692E” norms. The simulation showed that [...] Read more.
Simulations of the pump response time refer to the determination of the time constant of the transient process when the flow and pressure change. The changes mentioned in the standards are precisely defined and prescribed by the “MIL-P-19692E” norms. The simulation showed that the time constants are within the permissible limits prescribed by these norms. The diagram shows the responses for the considered pump and for the case when the flow changes from Qn to Qmin and changes from Qmin to Qn. The time constants t1 and t2 are defined on the diagrams, with the parameters that the pump has. In addition, the standards define the pressure jump that occurs during the transient process as well as time constants. From the flow change diagram, it can be seen that the flow change is also very fast and takes place in time intervals shorter than 0.1 s. By evaluating the size of the time constants, t1 and t2, it can be concluded that they have a value below 0.05 s, which meets the regulations in that area. Also, the size of the jump pressure meets the regulations because it is only 1.2 M Pa above the nominal pressure. Full article
(This article belongs to the Special Issue Application of Refrigeration and Heat Pump Technology)
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25 pages, 8850 KiB  
Article
Air Conditioning System Integrated with Thermal Energy Storage for Buildings in Tropical Climates
by Alex Santos, Willian Duarte, Paulo Barbieri, Luiz Machado, Tianhao Xu and Tiago Paulino
Processes 2024, 12(11), 2388; https://doi.org/10.3390/pr12112388 - 30 Oct 2024
Viewed by 980
Abstract
Thermal energy storage (TES) is an innovative technology that can help mitigate environmental problems and make energy consumption in air conditioning systems more efficient. TES also helps to decouple the production and use of cooling. In this work, a mathematical model was used [...] Read more.
Thermal energy storage (TES) is an innovative technology that can help mitigate environmental problems and make energy consumption in air conditioning systems more efficient. TES also helps to decouple the production and use of cooling. In this work, a mathematical model was used to obtain the thermal loads of the environment based on Brazilian standards and to simulate the operation of an air conditioning system integrated with TES. A refrigeration system capable of providing cooling capacity for the selected environment was used. It simulated the operation of refrigeration systems to evaluate the coefficient of performance of the refrigeration cycle and the refrigeration system, including the TES, for the city of Teresina, in the northeast region of Brazil. On each day, the efficiency of the air-cooled chiller coupled with a TES that used paraffin with phase change material was verified. Based on the data obtained from the mathematical model, the reduction in energy consumption achieved by coupling TES with the air conditioning system varied between 10.6% and 1.3%. Full article
(This article belongs to the Special Issue Application of Refrigeration and Heat Pump Technology)
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