Solar collectors network map: shape and time dynamics of stored thermal energy for different user loads

¹ Department of Engineering Thermodynamics, Heat Engines, Thermal and Refrigeration Equipment, University Politehnica of Bucharest, 313 Spl Independentei, Bucharest, Romania
² Faculty of Engineering in Foreign Languages, Mechanical Engineering field, University Politehnica of Bucharest, 313 Spl Independentei, Bucharest, Romania

^* Corresponding author: dorin.stanciu@upb.ro

Abstract

Solar flat plate collectors are commonly used to transform solar energy into thermal one by heating a heat transfer fluid (HTF). The available thermal energy to the user is characterized by a certain thermal capacity and a certain temperature level. Comparing to the case of a single collector, when a higher thermal capacity is required in the user process, more collectors should be coupled in parallel, so that the HTF mass flow rate is increased, exiting the solar collector at the same temperature. Another case may be encountered when the user process requires the same mass flow rate of HTF, but at a higher temperature. In this last case, a series connection is considered. The aim of the present paper is to compare these cases and to build a solar panel map that could be used to choose the best arrangements for a specific user need. A study is performed regarding the map dynamics with respect to HTF consumption to the user for three storage tank capacities of 100L, 200L and 300L respectively. The results reveal a recommendation regarding collectors coupling function on user needs.