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This literature review supported Optimizing limited solar roof access by exergy analysis of solar thermal, photovoltaic, and hybrid photovoltaic thermal systems - which resulted in the following publication:

Photovoltaic Thermal Hybrid[edit | edit source]

There is a renewed interest in photovoltaic solar thermal (PVT) hybrid systems, which harvest solar energy for heat and electricity. Typically, a main focus of a PVT system is to cool the photovoltaic (PV) cells to improve the electrical performance. This works well; however, this causes the thermal component to under-perform compared to a solar thermal collector. Recently there has been very promising work, which utilized the low temperature coefficients of amorphous silicon (a-Si:H) PV which allow the PV cells to be operated at high temperatures, creating a more symbiotic PVT system. See: M.J.M. Pathak, J.M. Pearce and, S.J. Harrison, "Effects on Amorphous Silicon Photovoltaic Performance from High-temperature Annealing Pulses in Photovoltaic Thermal Hybrid Devices" Solar Energy Materials and Solar Cells, 100, pp. 199-203 (2012). arXiv. The fundamental challenge of a-Si:H PV is light-induced degradation known as the Staebler–Wronski effect (SWE). Fortunately, SWE is reversible and the a-Si:H PV efficiency can be returned to its initial state if the cell is annealed. Thus an opportunity exists to deposit a-Si:H directly on the solar thermal absorber plate where the cells could reach the high temperatures required for annealing.

Related Appropedia articles[edit | edit source]

IEA TASK 35 PV/T[edit | edit source]

The IEA (International Energy Association) is almost finished their study on PV/T.

They had five subtasks:

  • Subtask A: Market and Commercialisation of PV/T
  • Subtask B: Energy Analysis and Modelling
  • Subtask C: Product and System Development, Tests and Evaluation
  • Subtask D: Demonstration Projects
  • Subtask E: Dissemination

They looked at 4 different types of PV/T set-ups in multiple countries.

  • PV/T liquid collector
  • PV/T air collector
  • PV/T concentrator
  • Ventilated PV with heat recovery

Canada is part of this TASK 35 and is studying Transpired Air PV/T collector at the National Solar Test Facility.

It started in 2005 and ended in 2008. Currently, they are reviewing the final draft. I have emailed the coordinators last week. See the following for contact information.

Everybody with the interest in PV/Thermal Solar Systems are invited to contact

Project Manager Jan Hansen, Esbensen Consulting Engineers A/S, j.hansen@esbensen.dk, +45 3326 7308

or

Operating Agent Henrik Sørensen, Esbensen Consulting Engineers A/S, h.soerensen@esbensen.dk, +45 3326 7304,

The website is http://pv-t.org/

The canadian group is: Leader for Subtask B is Michael Collins, University of Waterloo, Canada, funded by Natural Resources Canada.

Here is the annual report of SHC (solar heating and cooling program) SHC Annual Report 2008

Here is another report from IEA SHC overview of current tasks IEA SHC Current Tasks Report

5mjmp 19:12, 1 June 2009 (UTC)

Hybrid PV/Thermal Collectors 2000[edit | edit source]

Written: 2000

This paper talks about the current PV/T systems, the future systems and what needs to be done. Isreal (Cromagen) has PV/T's since 1991 and the use water as the cooling medium. Germany has two companies as well; SolarWerk and SolarWatt. "Both systems use plat plate solar heat collectors with PV cells integrated on the absorber." Canada (Conserval Engineering) uses air as its medium.

"PV/T-technology is still very new and there is a strong need for R&D and demonstration efforts in the following areas:

  • Maximization of heat transfer from the solar cell to the heat transfer medium and

maximization of the electrical yield from the solar cells for different temperaturelevels.

  • Durability testing of collectors and solar cells, especially for laminated solutions and

solutions where the solar cells operate at a high temperature.

  • A standardized method of assessing the energy performance of PV/T systems needs

to be defined and calculated, monitored and evaluated both for the commercial products and for the best solutions demonstrated as one-off systems in buildings."

09 05 23 Paper X Henrik Sorensen.pdf

5mjmp 19:41, 1 June 2009 (UTC)

H. SØRENSEN and D. MUNRO. Hybrid PV/Thermal Collectors. The 2nd World Solar Electric Buildings Conference: Sydney 8th-10th March 2000

Commerically Available PVT Products 2006[edit | edit source]

  • PVT air collectors
    • Aidt Miljo / Grammer Solar / Conserval Engineering
  • Ventilated PV with heat recovery
    • Secco Sistemi
  • PVT liquid collectors
    • PVTWINS / Millennium Electric
  • PVT concentrators
    • Arontis / HelioDynamics / Menova

09 05 23 4DA2-1 Commercially available PVT products v20070102.pdf

5mjmp 14:41, 3 June 2009 (UTC)

http://pv-t.org/ under documents

H.A. Zondag. Commerically Available PVT Products. Energy Research Center of the Netherlands. July 2006.

PVT - Untapped Energy 2007[edit | edit source]

The article talks about the potential of PVT's. This article specifically deals with Canada's involvement with Task 35 with PVT's using Air has its heat transfer medium. The testing was done at Canada's National Solar Test Facility (NSTF) indoors under the STC set by the IEA Task 35 group. Several companies supplied some of their PV panels which were then fitted to a thermal system. Test were done and efficiencies were calculated. The total efficiencies (thermal and electric) ranged from 21-56 %. It was found that thermal was 150-400% more efficient than electric for crystalline and up to 800% more efficient for amorphous. However, tests did show that cooling PV panels is more efficient and that it does cool the PV panels making them work better. Up to 0.5%/C better.

09 05 23 ASESPaper-PVThermalSystems-theUntappedEnergy175A3.pdf

5mjmp 14:12, 4 June 2009 (UTC)

J. Hollick and B. Barnes. PV Thermal Systems - Capturing the Untapped Energy. Conserval Engineering Inc. http://web.archive.org/web/20081120220702/http://solarwall.com/media/images-articles/ASESPaper-PVThermalSystems-theUntappedEnergy175A3.pdf