Category Polymeric Materials for Solar Thermal Applications

Christoph Zauner and Philippe Papillon

18.3.1

Description of the Specific Test and Test Procedure

The exposure test and the high-temperature resistance test provide a reliability test, indicating operating conditions that are likely to occur during real service. In addition, the exposition test allows the collector components to “steady down.” To assess whether a collector can withstand high irradiance levels as the high-temper­ature test is being carried out. This gives an indication of resistance of glass breakage, collapse ofplastic cover, melting ofplastic absorber, or significant depositions on the collector components from outgassing of collector material.

At both tests the collector shall be mounted outdoors, but not filled with fluid...

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Why this is a Problem for Polymeric Collectors or Why this Test Does not Reflect the Requirements for Polymeric Collectors

There is no specific problem for polymeric collectors. However, it is difficult to keep the test pressure constant during 1 h due to very small expansion of the polymer during the test under high temperature. Notably, absorbers based on metallic material can be pressure tested at ambient conditions.

18.2.3

Possible Alternative Procedure

The method for assessing the extent to which the absorber can withstand pressures at elevated temperature can be considered as adequate. However, compared to the absorber pressure test of metal based absorbers the costs are higher due to the additional requirements related to the higher temperatures. Thus a method should be found that would allow a test under ambient temperature.

18.3

High-Temperature Resistance and Exposure Tests

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Internal Absorber Pressure Test

Stephan Fischer

18.2.1

Description of the Specific Test and Test Procedure

The internal absorber pressure test is intended to assess the extent to which the absorber can withstand the pressures it might meet in service while operating at elevated temperature. This is done by means of applying 1.5 times the maximum operation pressure at a temperature the absorber would reach when exposed to an irradiance of 1000 W m~2 at 30 °C ambient temperature. For metal based absorbers this test is conducted with an absorber having ambient temperature.

When the test temperature exceeds 90 °C, the absorber may be connected to a hot oil circuit. The absorber and the hot oil circuit are then pressurized. The absorber may

Polymeric Materials for Solar Thermal Applications, First Edition. M. Kohl, M. G...

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Social housing in Paris, France

17 social housing units with solar collectors nicely integrated into the facade PROJECT

In Paris, opposite the metro station Barbes, the agency Philippon-Kalt Architects has delivered the first building of social housing with a facade made out of solar panels. The building consists of seventeen housing units. The solar panel facade traps solar energy to produce enough power to meet 40% of the domestic hot water needs.

The double skin facade offers not only complete privacy from the passengers commuting by the Skytrain, but it also restricts the noise flow from the Boulevard de la Chapelle.

References [17] 2

processes of cultural modification. PhD thesis, Department of Social Anthropology, Stockholm University, Sweden.

3 Christina, M. and Probst, M...

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Bjoernveien 119, Oslo, Norway

Multi-family house with solar collectors integrated into the facade PROJECT

Multi-family house, 8 flats (130-170 m[16]) in two and three stories – total area 1868 m2.

In the housings at Bjoernveien 119 in Oslo, the use of solar energy has been an important issue of the design. 100 square meters of solar collectors have been incorporated into the southern facade. In this project the produced energy will be stored and used to heat water that will flow into the water based floor heating system.

The dark, reflecting surfaces are attractive building elements, producing energy and acting as a sound barrier for road traffic.

Figure 17.4 Bjoernveien 119, Oslo, Norway (collector producer: Aventa).

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Penthouse Vienna, Austria

Austria Penthouse WEG with solar collectors used as sun shades

PROJECT

Penthouse Weg is a modern 2 flat penthouse, located in Vienna. Solar collectors are installed at the roof terrace providing domestic hot water for both flats.

The design of the vacuum tube collector fits very well to the modern roof landscape. Besides being energy deliverers, the collectors serve as sunshades.

“Home for Life” Concept House, Aarhus, Denmark Single-family house with roof integrated solar collectors PROJECT

The principal architectural idea in Home for Life is to unite single-family house requirements and experience, functionality and energy consumption in an inte­grated design.

VKR Holding, which is the mother company ofVELUX and VELFAC, has initiated the construction of eight demonstration houses in ...

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Examples

Figures 17.1-17.5 give showcase examples of the systems discussed in this chapter.

I-Box concept, Storelva/Tromsoe, Norway

7 dwellings in a row house with solar collectors integrated into the facade PROJECT

Multi-family house with passive house standard and solar heated tap water. The project is designed according to the I-Box concept from Steinsvik Architects. The 7 dwellings at Storelva was completed in 2008.

I-Box was the first passive house concept in Norway, and was awarded with the “Nordnorsk Arkitekturpris” in 2007...

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Web Database

As a contribution from IEA-SHC Task 39 to the challenge of making solar thermal systems more desirable a database consisting of showcases where solar thermal energy systems have been successfully integrated into the architecture has been established (http://www. iea-shc. org/task39/projects/). The idea is to make solar thermal more desirable by showing visually appealing solar systems – something people really would want to put on their houses and something architects would want to implement in their design of new buildings. It presents a broad range of projects where not only function but also aesthetics and architectural integration have been in focus when designing and installing solar thermal systems.

The technical and economical key data are only briefly listed in the database, while ...

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