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Title:
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Simulating PV-thermal collectors in large solar systems in TRNSYS
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Author(s):
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Published by:
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Publication date:
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ECN
Energy in the Built Environment
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1-12-2004
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ECN report number:
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Document type:
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ECN-RX--04-028
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Conference Paper
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Number of pages:
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Full text:
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14
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Download PDF
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Presented at: TRNSYS User day, Stuttgart, Germany, 26 maart 2004.
Abstract:
PVT panels generate electric power and heat simultaneously. PVT panelscan be used par excellence on places where there is a lack of available
roof area, for example on high-rise buildings. A study [1] of 3 high-rise
buildings in the Netherlands provided with a solar system for space
heating and domestic hot water shows that with PVT panels the annual
saved prime energy quantity will be 0.45 GJ/m2 more than in the case
with solar collectors only. A separate system of solar collectors and
PV requires 38 % more roof area than a PVT system with the same amount
of annual electricity and heat production.
The whole system is simulated with standard types (and equations) in
TRNSYS 15. The simulation of the control system requires a lot of work.
Shading of the PVT collectors itself (because they are mounted in rows
behind each other) has an influence on the annual energy production.
The influence of shading on the electric energy production is bigger
than on the thermal energy production. The shading effects of the PVT
collector fields are calculated with equations in TRNSYS. There is no
special type available and this would be very helpful.
One of the objectives of this study was to find a solar collector area
with a determined amount of energy production. In this study, this was
done by simulating the system a lot of times with different solar collector
areas just as long as the energy production complies with that amount
of energy. A kind of optimisation toolbox would be helpful for this,
but so far this is not included in TRNSYS.
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