摘要:

Design issues for compound parabolic concentrators for rural applications are addressed. Novel uses of asymmetric inverted absorber compound parabolic concentrators in air heating, water heating, distillation and cooking are described.

ISSN:0143-0750    

DOI:10.1080/01430750.1997.9675269

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

A box-type solar cooker is a simple device for harnessing solar energy for cooking. The large scale utilisation of solar cookers would depend on its financial performancevis-a-visother resource-technology combinations for cooking. To facilitate comparison of the financial attractiveness of a solar cooker with other alternatives for domestic cooking, the cost incurred on cooking a given meal and the cost per unit of useful energy delivered by various resource-technology combinations have been estimated in the present work. The sensitivity of these figures of merit with respect to the possible uncertainties in the values of input parameters has also been studied.

ISSN:0143-0750    

DOI:10.1080/01430750.1997.9675270

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

Influence of internal heat leak on the optimal performance of a heat pump is examined in this paper. This is done by adding a heat leak term into an endoreversible heat pump. The relation between optimal heating load and coefficients of performance (COP) for a steady-state irreversible heat pump is derived. The performance characteristics of the irreversible heat pump is found to be deeply affected by the rate of heat leak. This model allows a more reasonable prediction in the performance of an actual heat pump.

ISSN:0143-0750    

DOI:10.1080/01430750.1997.9675271

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

A brief description of the operation and analysis of a solar water pump is given. The performance of the pump is studied for various solar radiation intensities and ambient temperatures, so that a clear picture on the year-round performance of the pump emerges. The prediction reveals that the number of cycles and the overall efficiency increases with an increase in solar radiation intensity, whereas, with the increase in ambient temperature, the number of cycles initially increases with the temperature up to 30°C and decreases thereafter.

ISSN:0143-0750    

DOI:10.1080/01430750.1997.9675272

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

The roof as a major heat gain source has been analysed. A cavity roof system has been proposed to reduce the heat gain through the roof and a time dependent analysis carried out to model a non air-conditioned room with such a roof. Parametric studies on the effect of the depth of the cavity from the roof-top surface and the thickness of the air cavity have been carried out. The results presented are found to be valuable aids for passive roof design.

ISSN:0143-0750    

DOI:10.1080/01430750.1997.9675273

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

Sustainable Energy Development Planning has been the thrust area in developing countries like India. An Optimal Renewable Energy Model (OREM) with Reliability constraint which minimises the cost/efficiency ratio has been developed. The other constraints included in the model are social acceptance, resource limitation, demand and reliability factors. Thirty eight different renewable energy options are considered in the model. The OREM gives the allocation of renewable energy sources for lighting, cooking, pumping, heating, cooling and transportation end-uses for the year 2020–21 in India. For sustainable energy, the reliability of renewable energy systems have to be considered. In this paper, a detailed study has been made to analyse the reliability of a 15 kW solar photovoltaic system, which will be used in one of the constraint equations of the model. Reliability analysis reveals that there were no technical failures in the photovoltaic devices. But the power conversion accessories, such as the inverter and output contactor experienced failure rates of 1.48 × 10−4/hour and 1.67 × 10−4/hour respectively, resulting in poor reliability of the system. The reliability factor of the photovoltaic system is found to be 0.2 at 5000 hours. The fault analysis by Pareto diagram reveals that by eliminating the system component failures, the reliability factor can be improved to the factor of 0.67. As far as the solar PV is concerned, the model (OREM) selects solar PV for lighting to an extent of 0.5198 × 1015kJ and for pumping 1.2084 × 1015kJ.

ISSN:0143-0750    

DOI:10.1080/01430750.1997.9675274

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

ISSN:0143-0750    

DOI:10.1080/01430750.1997.9675275

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

ISSN:0143-0750    

DOI:10.1080/01430750.1997.9675276

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

ISSN:0143-0750    

DOI:10.1080/01430750.1997.9675268

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor