R. Kicsiny* and I. Farkas Szent Istvan University, Department of Physics and Process Control, Pater K. u. 1., Godollo, H-2103 Hungary Corresponding Author, Kicsiny. Richard@gek. szie. hu Abstract This paper introduces the realization and application of a block-oriented type physically-based model of solar heated thermal systems which is able to work with inputs from either […]

To describe the temperature field in a tube’s coating we choose a system of polar coordinates with O as the initial point and write Laplace’s equation in the polar coordinates assuming that the process is stationary [7]: (12)   (13) (14) (15) (16) (17)   d© 2jf>1,pP = Q (p <ф<п-ф1); dp d©2d(/?1,p) = 0 […]

The use of GIS in renewable energy that began in the 90s decade went through considerable progress and as a result various decision support tools were developed [1]. The GIS applications that were developed can be classified in three groups: GIS as a decision support tool for integration of renewable energies on a large scale […]

The time-use data is only available for one weekday and one weekend day per household, and therefore the model only generate average profiles for one day of each type, not depending on season or day of the week. To enable further model development the time dependent variations in load measured in the 24 apartments are […]

Even if many works [3] had analyzed the problem of the heat losses due to radiation and conduction, it is important to introduce a short summary. The first term to be evaluated is the net inward radiative heat flux defined as: (4) The irradiation, G, in general case can be written as: ■ ■ ■: […]

A more fair and uniform approach is being proposed by Horta et al.(2008 a, b), to be applied independently of the underlying optics. This approach allows using the test data currently collected on trials and is based on absorber irradiance values, Gabs = B cos 0 K(0) + Kd D + Kr D (where Kd […]

The Fourier amplitude sensitivity test (FAST) is a quantitative method [3]. It computes the contribution of each parameter to variations of the target function. It is called the “main effect” and defined as S, = varx.|£ (y|x >’ (2) j var(y) Variations in numerator and denominator of (2) are multidimensional integrals over appropriate spaces. Their […]

In this paragraph the main characteristics of the studied solar heating system and the elaborated physically-based model applied to the system are described in details. 1.1. Main characteristics of the solar heating system The monitored combined solar heating system installed at the campus of Szent Istvan University (SIU), Godollo, Hungary is sketched in Fig. 1. […]