ISSN:0142-5919    

DOI:10.1080/01425918708914415

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The effect of the tilt angle on design aspects and performance characteristics of a photovoltaic (PV) array is examined. It is shown that a load dependent seasonal variation of the tilt angle results in a substantial increase in the generated energy, as well as a more economical design of stand-alone PV systems. The proposed algorithms for estimating the optimum tilt angle, under a variety of conditions, are general in their applicability, simple in their implementation and computationally efficient while keeping the input data requirements to a minimum. It is assumed that the array modules are facing true south.

ISSN:0142-5919    

DOI:10.1080/01425918708914416

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The present paper investigates a simple correlation for the computation of monthly global solar irradiation on tilted south-facing surfaces. Original data used for this study are those of the Solar Radiation European Atlas, computed for tilted planes by Pr. Page's method. The conversion factor, R, from monthly irradiation on a horizontal plane to irradiation on the inclined surface, is a linear function of the monthly clearness index, K,. Practical coefficients of this correlation are function of geographical latitude, tilt angle and month. They are given for three tilt angle values: 30°, 60° and 90°. A simple polynomial interpolation vs tilt angle is also proposed. Simple conversion charts are given. For most of the months, the standard-deviation of relative differences (between computed and reference values) is smaller than 2%, being larger only during the winter period from November to February (2 to 5%, according to tilt angle).

ISSN:0142-5919    

DOI:10.1080/01425918708914417

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

ISSN:0142-5919    

DOI:10.1080/01425918708914418

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

A novel concept for a passive solar greenhouse for regions with mild winter climates is described. The concept was tested with a 66-m2prototype greenhouse. The roof of the greenhouse was made of modular double-layered transparent panels filled with a latent heat-storage material. During both night and day, the thermal performance of the test building was significantly better than that of the control glass house. The main drawback of the proposed method is that the light intensity is low in the morning until the solid Latent Heat Storage Material (LHSM) is completely melted. Therefore, practical application of this method is restricted to specific crops and climate regions.

ISSN:0142-5919    

DOI:10.1080/01425918708914419

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor