Load Adapted Solar Thermal Combisystems - Optical Analysis and Systems Optimization

Document identifier: oai:dalea.du.se:1020
Keyword: Solar Combisystems Concentrating Collector Optimization Incidence Angle Optical Efficiency Simulation TRNSYS Stagnation
Publication year: 2004
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Abstract:

In a northern European climate a typical solar combisystem for a single family house normally saves between 10 and 30 % of the auxiliary energy needed for space heating and domestic water heating. It is considered uneconomical to dimension systems for higher energy savings. Overheating problems may also occur. One way of avoiding these problems is to use a collector that is designed so that it has a low optical efficiency in summer, when the solar elevation is high and the load is small, and a high optical efficiency in early spring and late fall when the solar elevation is low and the load is large.The study investigates the possibilities to design the system and, in particular, the collector optics, in order to match the system performance with the yearly variations of the heating load and the solar irradiation. It seems possible to design practically viable load adapted collectors, and to use them for whole roofs ( 40 m2) without causing more overheating stress on the system than with a standard 10 m2 system. The load adapted collectors collect roughly as much energy per unit area as flat plate collectors, but they may be produced at a lower cost due to lower material costs. There is an additional potential for a cost reduction since it is possible to design the load adapted collector for low stagnation temperatures making it possible to use less expensive materials. One and the same collector design is suitable for a wide range of system sizes and roof inclinations. The report contains descriptions of optimized collector designs, properties of realistic collectors, and results of calculations of system output, stagnation performance and cost performance. Appropriate computer tools for optical analysis, optimization of collectors in systems and a very fast simulation model have been developed.

Authors

Svante Nordlander

Högskolan Dalarna; Miljöteknik
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    header: 
        identifier: oai:dalea.du.se:1020
        datestamp: 2021-04-15T12:18:17Z
        setSpec: SwePub-du
    metadata: 
        mods: 
            @attributes: 
                version: 3.7
            recordInfo: 
                recordContentSource: du
                recordCreationDate: 2005-04-28
            identifier: http://urn.kb.se/resolve?urn=urn:nbn:se:du-1020
            titleInfo: 
                @attributes: 
                    lang: eng
                title: Load Adapted Solar Thermal Combisystems - Optical Analysis and Systems Optimization
            abstract: 
In a northern European climate a typical solar combisystem for a single family house normally saves between 10 and 30 % of the auxiliary energy needed for space heating and domestic water heating. It is considered uneconomical to dimension systems for higher energy savings. Overheating problems may also occur. One way of avoiding these problems is to use a collector that is designed so that it has a low optical efficiency in summer when the solar elevation is high and the load is small and a high optical efficiency in early spring and late fall when the solar elevation is low and the load is large.The study investigates the possibilities to design the system and in particular the collector optics in order to match the system performance with the yearly variations of the heating load and the solar irradiation. It seems possible to design practically viable load adapted collectors and to use them for whole roofs ( 40 m2) without causing more overheating stress on the system than with a standard 10 m2 system. The load adapted collectors collect roughly as much energy per unit area as flat plate collectors but they may be produced at a lower cost due to lower material costs. There is an additional potential for a cost reduction since it is possible to design the load adapted collector for low stagnation temperatures making it possible to use less expensive materials. One and the same collector design is suitable for a wide range of system sizes and roof inclinations. The report contains descriptions of optimized collector designs properties of realistic collectors and results of calculations of system output stagnation performance and cost performance. Appropriate computer tools for optical analysis optimization of collectors in systems and a very fast simulation model have been developed.

            subject: 
                @attributes: 
                    lang: eng
                topic: Solar Combisystems Concentrating Collector Optimization Incidence Angle Optical Efficiency Simulation TRNSYS Stagnation
            language: 
                languageTerm: eng
            genre: 
                publication/licentiate-thesis
                vet
            note: 
                Published
                1
            name: 
                @attributes: 
                    type: personal
                namePart: 
                    Nordlander
                    Svante
                role: 
                    roleTerm: aut
                affiliation: 
                    Högskolan Dalarna
                    Miljöteknik
            originInfo: 
                dateIssued: 2004
                publisher: Uppsala Universitet
                place: 
                    placeTerm: Uppsala
            location: 
                url: http://du.diva-portal.org/smash/get/diva2:522555/FULLTEXT01.pdf
            accessCondition: gratis
            physicalDescription: 
                form: electronic
            typeOfResource: text