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Solar-Assisted Heat Pump Systems for Heating and Cooling

A special issue of Energies (ISSN 1996-1073).

Deadline for manuscript submissions: closed (18 September 2017) | Viewed by 12620

Special Issue Editors

Mälardalen University, School of Business, Society and Engineering, Box 883, 721 23 Västerås, Sweden
Interests: energy efficient buildings; solar energy; heat pumps; energy quality; calculation of primary energy
Mälardalen University, School of Business, Society and Engineering, Box 883, 721 23 Västerås, Sweden
Interests: building energy systems simulations; solar energy systems; heat pump systems; storage systems; energy efficiency; renewable energy

Special Issue Information

Dear Colleagues,

We are honored to invite you to publish in this Special Issue of the open access journals Energies.

In this Special Issue we have a special focus on solar assisted heat pump systems for heating and cooling of buildings. The solar system can be electrical or thermal, or a combination of both. The main focus is on novel system design and its performance in different building types with different electrical and thermal load pattern. The influence of the control strategies on the self-consumption of PV-electricity is an important research task. It is interesting to analyze how these systems interact with the national and international energy grids with regard to both electricity generation and heat production. Articles with a focus on how these systems are affected by, and fulfill, the different national regulations for energy use in buildings is also of interest for this Special Issue.

Prof. Dr. Björn Karlsson
Dr. Richard Thygesen
Guest Editors

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

  • solar assisted cooling
  • solar assisted heating
  • heat pumps
  • solar thermal systems
  • PV-systems
  • PV/T-systems
  • dynamic simulations
  • analysis of experimental data

Published Papers (2 papers)

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Research

5909 KiB  
Article
Comprehensive Parametric Study of a Solar Absorption Refrigeration System to Lower Its Cut In/Off Temperature
by Osman Wageiallah Mohammed and Guo Yanling
Energies 2017, 10(11), 1746; https://doi.org/10.3390/en10111746 - 31 Oct 2017
Cited by 9 | Viewed by 7366
Abstract
Solar-driven ammonia-water absorption refrigeration system (AARS) has been considered as an alternative for the conventional refrigeration and air-conditioning systems. However, its high initial cost seems to be the main problem that postpones its wide spread use. In the present study, a single-stage NH [...] Read more.
Solar-driven ammonia-water absorption refrigeration system (AARS) has been considered as an alternative for the conventional refrigeration and air-conditioning systems. However, its high initial cost seems to be the main problem that postpones its wide spread use. In the present study, a single-stage NH3/H2O ARS is analyzed in depth on the basis of energetic and exergetic coefficients of performance (COP and ECOP, respectively) to decrease its cut in/off temperature. This study was carried out to lower the required heat source temperature, so that a less-expensive solar collector could be used. Effects of all parameters that could influence the system’s performance and cut in/off temperature were investigated in detail. Presence of water in the refrigerant and evaporator temperature glide was considered. Results revealed that appropriate selection of system’s working condition can effectively reduce the driving temperature. Besides, the cut in/off temperature can be significantly decreased by inserting an effective solution heat exchanger (SHX). Required driving temperature can be lowered by up to 10 °C using SHX with 0.80 effectiveness. The results also showed that effects of water content in the refrigerant could not be neglected in studying NH3/H2O ARS because it affects both COP and ECOP. Additionally, a large temperature glide in the evaporator can substantially decrease the ECOP. Full article
(This article belongs to the Special Issue Solar-Assisted Heat Pump Systems for Heating and Cooling)
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3959 KiB  
Article
An Analysis of Different Solar-Assisted Heating Systems and Their Effect on the Energy Performance of Multifamily Buildings—A Swedish Case
by Richard Thygesen
Energies 2017, 10(1), 88; https://doi.org/10.3390/en10010088 - 12 Jan 2017
Cited by 17 | Viewed by 4458
Abstract
Today, the household sector in the European Union and in Sweden accounts for approximately 25% and 22% of the final energy demand, respectively, and the sector will continue to grow in the next decades. To limit the impact on the energy demand of [...] Read more.
Today, the household sector in the European Union and in Sweden accounts for approximately 25% and 22% of the final energy demand, respectively, and the sector will continue to grow in the next decades. To limit the impact on the energy demand of buildings, the European Union has introduced the Energy Performance of Building Directive. In Sweden, a proposal for building regulations adapted to the Energy Performance of Buildings Directive has been released, but no decision on implementation of it has been made. In this article, a real building is simulated to evaluate how different combinations of heating and decentralized energy generation systems are affecting the specific energy demand of the building. Also, an analysis on how the Swedish incentive schemes affect the choice of decentralized energy generation systems is conducted. Furthermore, it is investigated if it is necessary to adopt the incentive schemes to steer towards systems that reduce the specific energy demand of the building. The conclusion in this article is that the current incentive system is ineffective in terms of specific energy demand reduction of buildings. It needs to be adapted so it steers towards a reduction of the specific energy demand of buildings. Full article
(This article belongs to the Special Issue Solar-Assisted Heat Pump Systems for Heating and Cooling)
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