摘要:

Eurostat official figures for 1991 show that renewable energy contribution to primary production in the European Union (12) was 7% and to gross consumption 3.7%. These figures were calculated by a methodology which takes into account the actual energy content of renewable electricity from water, wind and other sources in terms of oil equivalent as for nuclear energy, a 3 times higher value is calculated by applying a Carnot conversion efficiency of 33%.

ISSN:0142-5919    

DOI:10.1080/01425919508914290

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

This text is not about predicting the future, but rather aims at discussing a methodology for shaping a range of collaborating future societies through a conscious democratic process, instead of having more or less arbitrary events and interest groups determine the path of change. The underlying belief is, that mere exists infinitely many possible futures, and that we can decide which one we want to be headed towards, as the outcome of a democratic process that lets our individual value system and preferences come into full play.

ISSN:0142-5919    

DOI:10.1080/01425919508914291

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

There has been considerable effort as to the manner in which the productivity of solar stills is affected by many of the designs and operating variables. To assist in designing the stills of improved performance, design parameters involved in the operation of the system have been considered in this paper. Curves showing the magnitude of the effects of design changes on the productivity are presented. Numerical computations, which are based on energy balances of different components of this system, confirm the productivity improvement in between 23.6% to 51.2% depending on the water-flow-rate from the vertical water column on the multiwicks. This design incorporates a multiwick solar still and a conventional basin type solar still. Hot water at considerably higher than the ambient temperature may be obtained at different flow rate from this design as well.

ISSN:0142-5919    

DOI:10.1080/01425919508914292

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

Theoretical and experimental investigations have been carried out on a flat-plat collector using covers employing Transparent Insulation Material (TIM). It has been found that for a minimum front heat loss coefficient an air gap of 20 mm between the plate and the TIM and 15 mm between the TIM and the outer cover should be used. The collector performance indicates that there is no advantage in using a TIM for domestic hot water heating, but that it could usefully be employed for medium temperature applications, i. e. aboye 80°C. A value of U/rη0=3.53 W/m2K has been achieved for the flat-plate collector with 100 mm TIM encapsulated between two Teflon films and an outer Tedlar cover.

ISSN:0142-5919    

DOI:10.1080/01425919508914293

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

TRNSYS program was used to simulate the performance of a thermosyphon type domestic solar water heating system which is used in the West Bank. The system installation and operation parameters were optimized including collector tilt angle, the hot water storage tank volume and location relative to the collector, and the hot water consumption pattern and daily rate.

ISSN:0142-5919    

DOI:10.1080/01425919508914294

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

A wind wheel turbine designed for low wind speed applications has been analytically investigated. The turbine is simple constructed from a bladed-assembly rotor directly exposed to the free wind on the upper half and exposd to the wind through a multiple ducting system on the lower half.

ISSN:0142-5919    

DOI:10.1080/01425919508914295

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor