摘要:

An analytical model of a new-conception of solid sorption solar cooling system and its numerical simulation are presented. This model combines instantaneous heat and mass transfers in each component of the machine, during a whole characteristic average day of each month. The innovation of the machine consists in the use of a polycarbonate honeycomb Transparent Insulation Material [TIM] cover for the solar collector and multitubular configurations for the reactor and the evaporator. The performance of the machine is evaluated utilising meteorological data for one region of Brazil close to the equator, for the hottest six months. The results are compared with those obtained by modeling the system with a single cover solar collector and those from an experimental study of a prototype with usual components realised in Tunisia. The average net solar Coefficient of Performance [COP] for the six months was 0.13 for the TIM cover system, corresponding to an ice production going from up to 7 to 10 kg per day per square metre of collector surface, respectively for March and December, with solar irradiations of 20 to 23 MJ/m2.

ISSN:0143-0750    

DOI:10.1080/01430750.1998.9675295

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

This paper reviews a previous analysis on the shading of buildings [1] and applies the same principles to applications in agriculture, e.g. the shading of rows of plants. The new model is applicable to vertical parallel rows of plants, such as the cordon-trained grapevine, aligned in any direction and on either horizontal or inclined slopes. At any particular plantation, information for optimal planting procedures could be determined. The plants could make a much greater use of solar energy compared with conventional procedures, with enhanced quality and quantity.

ISSN:0143-0750    

DOI:10.1080/01430750.1998.9675296

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Energy is a vital component in rural industries such as the Agro processing industries and the brick and tile industries. In rural areas, population pressure and low agricultural productivity are among factors forcing people into marginal and ecologically fragile lands. Forests are being logged to meet the energy demand of a region in addition to clearing forests for agricultural purposes to meet the demand of food. Soil erosion, siltation and floods are a consequence of the destruction of forests. The low productivity in agricultural lands and the lack of alternative employment opportunities in rural areas has resulted in large scale migration to urban areas in search of jobs. In this context, industries in rural areas would help in arresting rural migration to urban areas and help to improve the economic status of local people in the region. For the sustainable development of a region, industrialisation is to be supplemented with integrated energy planning approaches. It is therefore necessary to look for alternative sources of energy which are renewable in nature and which could be harnessed in a decentralised way. The energy efficiencies of end use devices could be improved and numerous opportunities exist for the development of industrial process with greater efficiencies.

ISSN:0143-0750    

DOI:10.1080/01430750.1998.9675297

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

The performance of a heat-pipe heat recovery unit was tested in a two-zone chamber with a horizontal partition. Air velocity was found to have a significant effect on the effectiveness of heat recovery. The effectiveness decreased with increasing air velocity.

ISSN:0143-0750    

DOI:10.1080/01430750.1998.9675298

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

This paper discusses the feasibility of reducing heat transferred into houses (insulation effect) and inducing natural ventilation by using a modified Trombe wall (MTW) under ambient conditions in Bangkok. It consists of a masonry wall, air gap and a gypsum wall which are common construction materials. It was found that the MTW with 2 m2of surface area, 14 cm air gap and dark in colour induced the highest natural ventilation rate, about 20–90 m3.h−1. The light colour of the wall induced the lowest rate, but was still significant for the ventilation of houses. With such air flow rates, there is little potential to induce sufficient ventilation to achieve thermal comfort of the house, however, the proposed configuration of the MTW should be recommended for constructing new houses, mainly, because of its high insulation effect.

ISSN:0143-0750    

DOI:10.1080/01430750.1998.9675299

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

ISSN:0143-0750    

DOI:10.1080/01430750.1998.9675300

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

ISSN:0143-0750    

DOI:10.1080/01430750.1998.9675301

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

ISSN:0143-0750    

DOI:10.1080/01430750.1998.9675294

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor