K.A. Antonopoulos

TL;DR: In this paper, correlations of the solar radiation for the Athens area are provided, based on hourly measurements over the period 1955-1980, and correlations are of two kinds: the first, which provides the average total radiation incident on a horizontal surface in terms of hour, day, and month of the typical year, is suitable for solar energy collection applications, and the second kind provides the maximum radiation and are suitable for use in the design of airconditioning installations or other applications requiring knowledge of maximum values.

TL;DR: In this paper, the same measurements are employed in conjunction with appropriate models for analysing total radiation in direct and diffuse components and for estimating the energy incident on tilted surfaces, which are presented in the form of algebraic correlations having as independent variable time (hour, day, month), surface azimuth and angle of inclination to the horizontal plane.

TL;DR: In this paper, the performance of NH3/H2O absorption units, operating in conjunction with high and intermediate temperature solar collectors in Athens, is predicted along the typical year, in the cases (a) of absorption refrigeration units working as refrigerators, and (b) of reversed absorption devices working as heat transformers.

TL;DR: In this article, simple correlations and corresponding nomographs are presented, which express the maximum useful heat received from salt-gradient solar ponds throughout the year or during a specified season of the year, and the corresponding optimum depth of the nonconvective zone in terms of the thickness of the upper convective zone and the temperature under which the maximum usable heat is received.

TL;DR: In this paper, a new solar-driven, NH 3 H 2 O absorption-refrigeration system is proposed, which may refrigeration temperatures as low as −60°C.