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ECN publication
Simulating PV-thermal collectors in large solar systems in TRNSYS
Published by: Publication date:
ECN Energy in the Built Environment 1-12-2004
ECN report number: Document type:
ECN-RX--04-028 Conference Paper
Number of pages: Full text:
14 Download PDF  

Presented at: TRNSYS User day, Stuttgart, Germany, 26 maart 2004.

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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