摘要:

Precondition of the successful application of Solar drying is the economy mainly influenced by the savings and the costs. Components of savings and costs are related to the design of the solar dryer and the drying technology to be performed. Analysis of relations between the technical solutions and the economy is presented with regard to some often neglected or undervaluated effects, i.e. savings obtained by the absolute cleanness of solar energy, quality of the dried product and, the energy effectiveness of the drying process itself. Conclusions of- fer some contributions of principle to the selection of the system of solar dryer to be used, to design of solar dryers and, to direction of the drying technology 131.

ISSN:0737-3937    

DOI:10.1080/07373938608916347

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The main application for solar collectors in agriculture are drying of agricultural crops. Different types of active air type solar collectors have been examlned In small scale experiments and in full scale trials. This report deals with practical applications OF solar collectors for dryers. The investigations have shown that solar collectors can replace conventional heating units based on 011, electricity etc. for the heating. The most economical and practical solution is received lf the collector is integrated in the roof or a wall of a farm building. The report gives recommendations for the construction and For the choice of materials. Design dates and operation schedules are also presented.

ISSN:0737-3937    

DOI:10.1080/07373938608916348

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

A mathematical formulation of the physical process of solar drying based on conventional heat and mass transfer equations is presented. The model Includes: a a technique of estimating the solar radiation on a south-facing tilted panel using the meteorological and geographical parameters for a typical location; b the procedures for obtaining the thermal performance of a solar air-heater for a flat-plate flow-over-absorber design; c an analysis of the drying process based on the Lewis analogy and the Equilibrium Moisture Content concept. Results predicted by the simulation model are presented.

ISSN:0737-3937    

DOI:10.1080/07373938608916349

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The aim of this study is to show how a simple numerical model can improve the understanding of the thermal and hydrodynamic behaviour of a dryer working under natural conditions. This model is managed taking into account the real operating conditions of the dryer. The general procedure permits a hydrodynamic curve to be obtained and is validated by a comparison with experimental results.

ISSN:0737-3937    

DOI:10.1080/07373938608916350

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

A solar tunnel dryer with integrated collector was developed and tested. This low-cost system can be produced either by small scale industries or farmers themselves using simple tools and relatively cheap materials. Depending on weather conditions about 1000 kg grapes can be dried within 4 to 7 days. According to the drying capacity the solar drying system can be successfully applied to farms with an acreage of 0.5 to 1.0 hectare.

ISSN:0737-3937    

DOI:10.1080/07373938608916351

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The technical and economical feasibility of using solar energy for curing Virginia tobacco in the bulk barn is investigated. The results illustrate that the energy saving obtained by each type of the system studied is limited because of the nature of the tobacco curing energy requirement. From the technical point of view, the system using water as a heat transfer fluid with an evacuated solar collector shows the best performance. To be economically competitive, the systems need to be multi-purpose: for example, they can be used for space and water heating or for drying other crops during the off-season for tobacco.

ISSN:0737-3937    

DOI:10.1080/07373938608916352

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The drying of Sultana seedless grapes was investigated under intermittent and continuous operating conditions in a laboratory solar installation involving a thermal storage bed and an auxiliary heater. The effect of pretreatment, and of the a i r velocity on the drying rate of the grapes at constant temperature was also studied in relation t o the quality of the dried product.

ISSN:0737-3937    

DOI:10.1080/07373938608916353

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Developing countries with a timber resource that can be manufactured into finished products either for local use or export often lack the capital to build high-cost dry kilns. Many of these countries are in the tropics where solar radiation and ambient temperatures are high. The low-cost solar/wood energy lumber dry kiln described in this report was designed and tested for such countries where solar dry kilns can be built and operated at low cost.

ISSN:0737-3937    

DOI:10.1080/07373938608916354

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

ISSN:0737-3937    

DOI:10.1080/07373938608916346

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor