摘要:

AbstractDaily values of solar and wind energy have been used (i) to study renewable energy availability at various times of year, (ii) to test the level of persistence for inferences about the practicality of energy storage and (iii) to examine the complementary behaviour of these two daily time series on both seasonal and daily bases. Results for the station studied (central Iowa) show a bimodal distribution for winter solar energy, whereas non‐winter solar and wind (all seasons) show unimodal distributions. Wind and solar energy were observed to be highly complementary on an annual basis, but only slightly complementary on a daily basi

ISSN:0363-907X    

DOI:10.1002/er.4440030202

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

年代:1979

数据来源: WILEY

摘要:

AbstractA simulation analysis is presented of domestic heating by a wind power system including storage at a location 54°39′ N, 6°13′ W (Aldergrove, Northern Ireland). A simple theoretical model is constructed comprising a house of specified dimensions and heat loss characteristics, an aerogenerator and a thermal store. the data base used is a magnetic tape of hourly wind speed and air temperature readings taken at Aldergrove meteorological station during 1949–75. the results suggest a measure of optimization between store capacity and generator rating based on technical considerations alone, and a simple economic optimization is also pr

ISSN:0363-907X    

DOI:10.1002/er.4440030203

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

年代:1979

数据来源: WILEY

摘要:

AbstractA prototype ammonia dissociator has been constructed and operated over a wide variety of conditions, and its performance has been examined in relation to solar thermochemical absorber operation. High values of energy storage efficiency approaching unity are obtained for high values of reaction extent, corresponding to the use of high activity ammonia dissociation catalysts. There is a need for further development of such catalysts designed specifically for solar absorber operating conditions. It is shown that in order to make optimum use of the available catalyst volume, the power density profile and specific absorber design should be matched to give an essentially isothermal temperature profile along the catalyst chamber length. There is potential for a solar thermochemical absorber based on ammonia dissociation to be constructed using simple tube technology and thus within the severe cost constraints associated with solar absorber design.

ISSN:0363-907X    

DOI:10.1002/er.4440030204

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

年代:1979

数据来源: WILEY

摘要:

AbstractIsolation of the hydrogen and oxygen plants from the rest of the liquefaction complex, combined with appropriate transfer costs for all utilities and raw materials has been used to estimate the value of hydrogen. For the five alternatives, minimum cost hydrogen is produced by gasification of coal at 1000 psia. 500 psia gasification of coal yielded slightly more expensive hydrogen; however, on an equivalent mole basis of hydrogen, they were virtually the same. As would be expected, the cost of coal, discount cash flow rate and method of costing supplemental fuel needs were the primary variables affecting the cost of hydrogen. Hydrogen cost ranged from $0·847/1000 standard cubic feet to $2·986/1000 standard cubic fee

ISSN:0363-907X    

DOI:10.1002/er.4440030205

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

年代:1979

数据来源: WILEY

摘要:

AbstractA new form of wave‐power convertor is described which operates entirely beneath the water surface. Its operating principles are derived from theories relating to immersed cylinders which predict that a substantial proportion of incident wave‐power can be absorbed by such bodies if they are constrained to respond to the waves in a prescribed way. Here, a series of discrete pulsating sources distributed around the surface of a stationary cylindrical body are used to approximate the necessary bodily motion.A one‐hundredth scale model has been built and tested in a wave‐tank, and the results of these experiments are presented. They indicate that under optimum operating conditions most of the incident wave‐power is absorbed by the device. However, little of this power appears as useful work owing to the frictional losses inherent in such a small‐scale model. Further analysis of the data estimates the extent of the losses, and after taking these into account figures are arrived at for the optimal operation of the model in loss‐less condition. This paper concludes with a discussion of the prospects for furthe

ISSN:0363-907X    

DOI:10.1002/er.4440030206

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

年代:1979

数据来源: WILEY

摘要:

AbstractThe program described in this paper computes the heat loss by convection and radiation from one or two pane windows, glazed with plastic or glass, coated with infra‐red reflecting layers, bloomed to reduce reflection of visible radiation, and whose interpane space is filled with various gases. Comprehensive weather measurements from Kew (London) for the years 1959–1969 are read in for each hour. Energy losses at each glazing element are calculated using data concerning the behaviour of the various coatings and glazing materials towards visible and infra‐red radiation. the advantages of coated windows for passive solar heating are disc

ISSN:0363-907X    

DOI:10.1002/er.4440030207

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

年代:1979

数据来源: WILEY

摘要:

AbstractIt is desirable to test heat pumps over the whole range of conditions under which they will be used. A test facility built at BRE is described in which these conditions may be readily adjusted in a controlled manner, the test procedure for a heat pump unit being carried out in a relatively short time. the heat pump itself is utilized to attain conditions of lower temperature and humidity than ambient.The problems of measuring heat transport in air streams are outlined and ways of overcoming them are given. Particular attention should be given to mixing the air streams.Various aspects of instrumentation of such a test facility are discussed.

ISSN:0363-907X    

DOI:10.1002/er.4440030208

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

年代:1979

数据来源: WILEY

摘要:

AbstractIn this analysis, the velocity and the current distributions and the efficiency of the MHD generator in the inlet region of the duct are analysed for the case when the conducting fluid enters the duct with a uniform velocity. It is found that the Hall and the ionslip currents produce fluctuations in the current components. Transverse current, surprisingly, does not show any fluctuations for the parameters used in this analysis. the efficiency at any point in the developing flow region is more comparable with that in the fully developed region. the variation of axial current, transverse current and the efficiency for various parameters in the developing region are shown graphically.

ISSN:0363-907X    

DOI:10.1002/er.4440030209

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

年代:1979

数据来源: WILEY

ISSN:0363-907X    

DOI:10.1002/er.4440030210

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

年代:1979

数据来源: WILEY

ISSN:0363-907X    

DOI:10.1002/er.4440030201

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

年代:1979

数据来源: WILEY