摘要:

AbstractThis paper illustrates an analysis of the performance of a solar wall as a collector storage system. the south facing wall consists of a mass of concrete/brick whose one surface is blackened and glazed, and a network of pipes (metallic or plastic) is laid in a plane from which heat can be extracted by flow of fluid in such a manner that the temperature of the plane of heat retrieval keeps constant. the collection efficiency of the system is found to be 80·0 and 60·7 per cent for collection temperatures 20 and 25°C respectively on the surface; the maxima/minima of the rate of heat retrieval (Q(t)) occurs about 12 h after the maxima/minima of solar temperature at a depth of the plane of heat retrieval = π/α1, with a maximum efficiency of 2

ISSN:0363-907X    

DOI:10.1002/er.4440040402

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1980

数据来源: WILEY

摘要:

AbstractSelective black nickel coatings with solar absorptance (αs = 0·94) and thermal emittance (ε = 0.08) at 100°C have been developed on galvanized steel using electroplating and chemical conversion techniques. Thermal performance tests have been conducted on selective and non‐selective collectors with single glass cover. A suitable collector test assembly has been constructed for thermal performance study. Measurements have been made under clear sky conditions over a wide range of inlet temperatures. For comparison, measurements have been carried out on an identical collector painted black. Thermal efficiencies of about 28 per cent at an operating water temperature =100°C ambient temperature =35°C and incident insolation =1000 W/m2 have been o

ISSN:0363-907X    

DOI:10.1002/er.4440040403

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1980

数据来源: WILEY

摘要:

AbstractThis communication presents a theoretical analysis of a shallow solar pond water heater, which is in good agreement with the experiments of Kudish and Wolf (1979) and the authors. the heater consists of an insulated metallic rectangular tank with black bottom and sides and a transparent cover at the top. After the collection of solar energy during sunshine hours the heater stores a substantial amount of heat because the top glass cover is covered by an adequate insulation in the night. Analytical expressions for the transient rise of temperature of water in the tank have been derived taking into account the appropriate heat transfer processes during day and night. These experimental results as well as those of Kudish and Wolf (1979) have been found to be in good agreement with the theory presented in this paper. the effects of one more glass cover on the top, and of the thickness of the bottom and side insulation and tank depth on the water temperature have also been studied.

ISSN:0363-907X    

DOI:10.1002/er.4440040404

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1980

数据来源: WILEY

摘要:

AbstractThe photogalvanic cell making use of the photoreduction of riboflavin with ethylenediaminetetraacetic acid has been examined. Appreciable photoinduced voltage has been observed. the photoinduced current is, however, low. the estimated sunlight engineering efficiency has been estimated to be ∼0.018 per cen

ISSN:0363-907X    

DOI:10.1002/er.4440040405

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1980

数据来源: WILEY

摘要:

AbstractThe paper presents a theoretical discussion and some basic ideas for the actual design of an engine, which can directly convert Concentration Difference Energy into mechanical work. the engine would work between tow concentrations of a solution. Unlike conventional heat engines, it would work at a single temperature, without violating any law of thermodynamics.It has been shown that a large amount of energy due to the salinity gradient at the interface of river‐water and sea‐water can be tapped through this engine. Also the energy of the atmosphere can be tapped.The engine would work without pollution of any k

ISSN:0363-907X    

DOI:10.1002/er.4440040406

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1980

数据来源: WILEY

摘要:

AbstractA small through‐the‐wall heat pump unit has been developed and tested to provide information on the problems associated with such machines. It is an air‐to‐air heat pump based on refrigeration components and is designed to supply sufficient heat for one room of a dwelling. the evaluation has been carried out in an experimental test facility built specifically to handle air source hea

ISSN:0363-907X    

DOI:10.1002/er.4440040407

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1980

数据来源: WILEY

摘要:

AbstractA model which simulates residential energy use in New Zealand until the year 2000 has been developed. This paper describes some of the energy conservation possibilities and their effect on energy use for space and water heating. an engineering analysis made to determine the effect of various factors on energy use for space heating is first described. the information gained from many computer simulations is used to develop a quantitative relationship between space heating energy and major determinants—climatic location, building type and intensity of use. Results from an engineering analysis of a water heating unit are used to establish the energy savings due to improved cylinder insulation and lower storage temperature. A solar space and water heating system is analysed to determine the fraction of total heating load that can be met by harnessing solar energy. the analyses demonstrate that the potential of conservation measures to reduce energy use can be substantial—by raising the insulation level on the building and on the water heating cylinder, by lowering the water storage temperature, and by installing an optimized solar heating system, the energy requirement can be reduced to 0·37 times what it is today for a typical uninsulated

ISSN:0363-907X    

DOI:10.1002/er.4440040408

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1980

数据来源: WILEY

摘要:

AbstractThe paper describes energy use in a particular heavy engineering workshop and investigates the consequences of possible improvements to lighting, to the thermal performance of the building and to the means of distribution of power. Comparisons are made with previous work done on other factories engaged in engineering. A method of describing the economic potential of energy conservation as an element of energy strategy is proposed.

ISSN:0363-907X    

DOI:10.1002/er.4440040409

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1980

数据来源: WILEY

摘要:

AbstractDistrict heating projects are planned with the help of a standard heat load duration curve, being the representation of the most likely load pattern the system will have to meet.A systematic procedure to estimate the standard curve is set up: the daily average outside temperature density function is transformed with a relationship between this temperature and the daily average heat load, resulting in a density over the heat loads. the cumulative distribution of the latter is the day load duration curve.Because the result has to be used for capacity planning, the unitary time interval has to be small, e.g. 1 hour. Therefore, the day curve is refined by incorporating the fluctuations over the day.The hour load duration pattern is approximated analytically using the collocation polynomial technique of Lagrange.Results are in agreement with the postulated standard patterns of the literature. the paper adds to the state of the art primarily by presenting a systematic procedure to derive the curve and by expressing the curve analytically. the systematic approach allows a clear interpretation and an extension of the varous steps of the load analysis.

ISSN:0363-907X    

DOI:10.1002/er.4440040410

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1980

数据来源: WILEY

ISSN:0363-907X    

DOI:10.1002/er.4440040401

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1980

数据来源: WILEY