摘要:

Based upon the heat transfer analysis of the performance of the heat pipe flat plate collector, some experimental studies were carried out on the heat transfer characteristics of a closed thermosiphon (gravity-assisted) heat pipe under the heat flux conditions occurring in flat plate solar collectors. An outdoor performance test of a heat pipe solar collector and a conventional one which has the same structure and size was undertaken. The experimental research indicates that little thermal performance improvement will be obtained in a heat pipe solar collector; however, with a view to solving the freezing and corrosion problems of solar collectors, it is worthwhile to do further R&D on the use of heat pipe technology in flat plate solar collectors

ISSN:0142-5919    

DOI:10.1080/01425918408914378

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

Radiative heat transfer in SiO2aerogel is determined from the spectral infrared extinction (absorption) E(λ). From E( λ) we derive a temperature dependent Rosse-land mean Ē(T) for extinction. A suitable diffusion model for the infrared radiation allows to calculate the temperature dependent radiative loss coefficient kraa(T). For a 1 cm thick aerogel board and a mean temperature within the insulation of T = 280 K, a value as low as krad,≃ 0.16W/m2K results. Between T = 250 and 450K a good approximation israd∞Tα, with α = 5.6.

ISSN:0142-5919    

DOI:10.1080/01425918408914379

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

In this note, an analysis of winter greenhouse has been presented. Effect of various parameters viz. ventillation/infiltration, relative humidity, movable insulation etc. have been incorporated in the analysis and their effect on the performance of greenhouse has also been studied. On the basis of numerical calculations, some interesting conclusions have been made

ISSN:0142-5919    

DOI:10.1080/01425918408914380

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

The mislocation of solar energy production facilities and points of demand and the temporal mismatch of solar energy availability and energy demand make transport and storage of solar energy essential. Research at the Solar Energy Research Institute has focused on high-temperature, diurnal storage because of the frequency of use and the potential for conservation of premium fossil fuels. Also, high-temperature thermal energy storage can reduce the cost of hydrogen production, electricity and heat produced by cogeneration, and methane reforming. SERI research is concentrating on containment techniques (including materials corrosion, internal insulation, and storage medium for high-temperature molten salts) and direct-contact heat exchange (including cost-effective heat exchanger design and heat transfer of various materials). After initial screening tests we selected carbonates for further study. We are now constructing test equipment that will allow heat transfer experiments with molten carbonate to 700°C

ISSN:0142-5919    

DOI:10.1080/01425918408914381

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

ISSN:0142-5919    

DOI:10.1080/01425918408914382

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor