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Experimental evaluation of a novel absorption heat pump module for solar cooling applications
Dalarna University, School of Technology and Business Studies, Energy Technology. Mälardalen University.
Dalarna University, School of Technology and Business Studies, Energy Technology.
2015 (English)In: Science and Technology for the Built Environment, ISSN 2374-4731, Vol. 21, no 3, 323-331 p.Article in journal (Refereed) Published
Abstract [en]

Given the environmental benefits of utilizing free thermal energy sources, such as waste heat and solar energy for cooling purposes, many developments have come about in thermally driven cooling. However, there are still some barriers to the general commercialization and market penetration of such technologies that are associated with system and installation costs, complexity, and maintenance. In efforts to overcome these limitations, a novel absorption heat pump module has been developed and tested. The module comprises a fully encapsulated sorption tube containing hygroscopic salt sorbent and water as a refrigerant, sealed under vacuum, and within which there are no moving parts. The absorption module consists of two main components, one that alternately functions as an absorber or generator and other that alternates between the roles of evaporator and condenser. The module therefore operates cyclically between a cooling delivery phase and a regeneration phase. Each module has a significant energy storage capacity with cooling delivery phases ranging from 6-10 h in length with temperature lifts between 16 degrees C and 25 degrees C. The modules are optimized for integration directly into a solar thermal collector, for roof or facade installation, for daytime regeneration and night-time cooling delivery. Collector integrated modules would be completely modular maintenance-free absorption heat pumps with similar installation requirements to standard solar thermal collectors. This article describes the test method and performance characteristics of the individual absorption modules.

Place, publisher, year, edition, pages
2015. Vol. 21, no 3, 323-331 p.
National Category
Energy Engineering
Research subject
Energy, Forests and Built Environments
Identifiers
URN: urn:nbn:se:du-19811DOI: 10.1080/10789669.2014.990336ISI: 000362067900010OAI: oai:DiVA.org:du-19811DiVA: diva2:862720
Available from: 2015-10-23 Created: 2015-10-23 Last updated: 2016-04-01Bibliographically approved
In thesis
1. Evaluation of a thermally driven heat pump for solar heating and cooling applications
Open this publication in new window or tab >>Evaluation of a thermally driven heat pump for solar heating and cooling applications
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Exploiting solar energy technology for both heating and cooling purposes has the potential of meeting an appreciable portion of the energy demand in buildings throughout the year. By developing an integrated, multi-purpose solar energy system, that can operate all twelve months of the year, a high utilisation factor can be achieved which translates to more economical systems. However, there are still some techno-economic barriers to the general commercialisation and market penetration of such technologies. These are associated with high system and installation costs, significant system complexity, and lack of knowledge of system implementation and expected performance. A sorption heat pump module that can be integrated directly into a solar thermal collector has thus been developed in order to tackle the aforementioned market barriers. This has been designed for the development of cost-effective pre-engineered solar energy system kits that can provide both heating and cooling.

This thesis summarises the characterisation studies of the operation of individual sorption modules, sorption module integrated solar collectors and a full solar heating and cooling system employing sorption module integrated collectors. Key performance indicators for the individual sorption modules showed cooling delivery for 6 hours at an average power of 40 W and a temperature lift of 21°C. Upon integration of the sorption modules into a solar collector, measured solar radiation energy to cooling energy conversion efficiencies (solar cooling COP) were between 0.10 and 0.25 with average cooling powers between 90 and 200 W/m2 collector aperture area. Further investigations of the sorption module integrated collectors implementation in a full solar heating and cooling system yielded electrical cooling COP ranging from 1.7 to 12.6 with an average of 10.6 for the test period.

Additionally, simulations were performed to determine system energy and cost saving potential for various system sizes over a full year of operation for a 140 m2 single-family dwelling located in Madrid, Spain. Simulations yielded an annual solar fraction of 42% and potential cost savings of €386 per annum for a solar heating and cooling installation employing 20m2 of sorption integrated collectors.

Place, publisher, year, edition, pages
Västerås: Mälardalens Högskola, 2015
Series
Mälardalen University Press Licentiate Theses, ISSN 1651-9256 ; 222
Keyword
solar energy; solar heating and cooling; sorption integrated
National Category
Energy Engineering
Research subject
Energy, Forests and Built Environments, Reesbe företagsforskarskola
Identifiers
urn:nbn:se:du-20321 (URN)9789174852400 (ISBN)
Presentation
2015-11-26, Paros, Mälardalens Högskola, Västerås, 10:00 (English)
Opponent
Supervisors
Available from: 2015-12-01 Created: 2015-11-30 Last updated: 2016-03-16Bibliographically approved

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Citation style
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