Precise evaluation of heat energy for hot water for energy efficiency calculations

Abstract

Energy efficiency in present days has become a very important subject. While prices of energy resources rise every day, the energy efficiency becomes even more important issue. It is not enough just to reduce energy consumption as much as possible – it is necessary to identify applied measures and to evaluate their impact on energy resources usage. Various measures are applied but it is difficult to separate the individual impact of them on final energy consumption. Without having a precise value of separate applied measure we are blind to apply them further. Since determination of precise values from a final energy consumption balance becomes very important, this article presents how to evaluate the heat energy for hot water circulation system and hot water preparation. Study shows that at present time all most frequently applied calculations can be raised to a new level taking into consideration ground and outside air temperatures as they influences temperature of cold water for hot water preparation and final energy balance. The study analyses more than few thousands of buildings and presents dependence of heat energy for hot water circulation on a ground temperature. The results, conclusions and developed methodologies of this study can be applied for one building or for huge group of buildings as well.