摘要:

AbstractThis paper presents the thermal performance, in the heating and cooling of a building, of a double hollow concrete slab, one of whose faces is exposed to solar radiation and ambient air while the other is in contact with room air at constant temperature. A blackwened network of pipes is laid on the top surface and glazed sutiably. the flow rate of water / air through pipes is kept constant. It is seen that there is a time difference of 10‐12 h between the maximum/ minimum of the thermal flux extering the room and the solair temperature for any flow rate. the heat flux inside the room is reduced appreciably for higher infiltration when there is no water flow to heat the building. the effect of a water film on the performance of the wall/roof has also been discussed and found to be more effective for the reduction of the heat flux coming into the buildin

ISSN:0363-907X    

DOI:10.1002/er.4440050302

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

年代:1981

数据来源: WILEY

摘要:

AbstractLocal similarity solutions of the forced and free convection flow past a semi‐infinite vertical porous plate have been obtained numerically. Velocity and temperature profiles are shown for air (Pr= 0.72) and for different values ofGr (Gr>0, cooling of the plate andGr0, suction, fw<0, injection). the effects of these parameters are discusse

ISSN:0363-907X    

DOI:10.1002/er.4440050303

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

年代:1981

数据来源: WILEY

摘要:

AbstractDecision making under risk offers promise of a new and valuable procedure for social decisions. In this paper the theory of risk perference is adopted and it is shown that the interesting type of risk attitude is constant risk aversion. the theory is applied to a nuclear power system consisting of PHWRs and PWRs integrated with LMFBRs. Nine development alternatives for the system which evolves over a time period of 40 years are considered. the fast reactor integration is accomplished beginning in year 15 with a variable time delay so that for every alternative, six final states are possible. an econometric model of the system offers the cost price of annual energy generated by the system at the end of a given time interval for every possible state of any aiternative. Further, every state of an alternative is associated with a known probability and the concept of lottery is introduced. Finally, it is shown how to quantify the attitude toward risk and how to select among lotteries. In this way it was possible to obtaine the optimal development alternatives of the nuclear system in three cases: risk‐perference, risk‐indifference and risk‐aversion. the solution in the last case is discussed in d

ISSN:0363-907X    

DOI:10.1002/er.4440050304

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

年代:1981

数据来源: WILEY

摘要:

AbstractThe transient heat transfer model of a solar air heater is developed and the resulting system is solved by using an explicit finite difference technique. the solar radiation data and the ambient temperature have been represented by a Fourier series in the numerical calculation. the effects of various design parameters of the heater on its performance are studied.

ISSN:0363-907X    

DOI:10.1002/er.4440050305

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

年代:1981

数据来源: WILEY

摘要:

AbstractDifficulties in the optimization of combustion processes are usually connected with errors in measurement. In this paper the method of co‐ordination of material balances is employed to reduce these errors. the measured and calculated results for the combustion of coal are presente

ISSN:0363-907X    

DOI:10.1002/er.4440050306

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

年代:1981

数据来源: WILEY

摘要:

AbstractIn addition to a primary emphasis as a near term, cost effective, clean boiler fuel, solid solvent refined coal (SRC‐I) has unique potential as an intermediate to produce products of vital importance to several of the basic industries in the U.S.A. These include the aluminium, steel, chemical, and petroleum industries, in addition to the electric utilities.Solid SRC can be hydrotreated catalytically to produce liquid fuels and aromatic chemicals using technology which is commercially proven on petroleum residuums. At comparable product cost, these liquids would be lower in sulphur and nitrogen than competitive one‐stage coal liquefaction processes. Thus, coal can be converted to products to serve the major uses of petroleum, i.e. transportation fuels and fuel oils which will facilitate displacing the imported petroleum currently serving these markets. Secondly, solid SRC can be coked and calcined to produce anode quality coke for the aluminium industry. Currently, carbon anodes, which are an essential component of the Hall smelting process, are being produced from petroleum based coke. Thirdly, metallurgical Formcoke used in steel industry blast furnaces can be produced by processing solid SRC with hydrocarbonized non‐metallurgical grade coals. the process using SRC as the binder is continuous, environmentally acceptable, and economic as compared to the batch coke over route using coking coals.Solid SRC, with its uniform properties relatively independent of feed coal, could solve many of the raw materials and fuel requirements of the aluminium, steel, and petroleum fuels indus

ISSN:0363-907X    

DOI:10.1002/er.4440050307

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

年代:1981

数据来源: WILEY

摘要:

AbstractThe geometrical behaviour of a focusing parabolic trough with a fin receiver has been studied in detail keeping in view the interesting application of this system for photovoltaic conversion of solar energy through double‐sided and multiple‐junction edge illuminated solar cells. Results regarding the influence of the pointing errors of the trough and alignment errors of the fin on the geometrical concentration rato of the system are presen

ISSN:0363-907X    

DOI:10.1002/er.4440050308

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

年代:1981

数据来源: WILEY

摘要:

AbstractIn this paper we have investigated the optimum distribution of concrete thickness (keeping the total thickness constant) in a double hollow concret slab for achieving the best load levelling of thermal flux; it is seen that for a given total thickness of concrete, this is achieved when the thicknesses of the outer and inner layers of the concrete are least (consistent with structural considerations).

ISSN:0363-907X    

DOI:10.1002/er.4440050309

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

年代:1981

数据来源: WILEY

摘要:

AbstractVarious algebraic formulas for representing solar radiation data are discussed and the results obtained are compared.

ISSN:0363-907X    

DOI:10.1002/er.4440050310

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

年代:1981

数据来源: WILEY

ISSN:0363-907X    

DOI:10.1002/er.4440050311

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

年代:1981

数据来源: WILEY