Energy consumption of water supply system’s utilities in building

Abstract

Authors have continued the study of the energy consumption in the building by various engineering systems in this work. The energy consumption of new engineering system, which was previously not taken into account in the total energy consumption of the building, is investigated. There is discusses the consumption of both electric and thermal energy by the building’s cold water supply system. The share of the cold water supply system in the specific thermal and electrical characteristics of the general water supply system (hot and cold parts of the water supply) of the building has been determined. Also, there is a special attention to the passive consumption of thermal energy by the cold water supply system, which was not previously carried out due to its small share in the total heat consumption of the building in this article. In this case, the “active heat energy” is used by the hot water supply system, which, despite the cold, must be forcedly heated in a special installation. Also, there is in this technique, takes into account seasonal fluctuations in the temperature of cold water by dividing the consumption of thermal energy into winter and summer periods of the year. It is also possible to do the full analyse the work of the frequency regulators widely used for the building’s water supply system, but it should also be taken into account that the regulators have additional energy costs which is depending on various operating modes (standby mode, regulation mode, etc.) . In this paper, authors consider only in systems where is only booster pumps, mechanical flow meters, and non-automated valves are installed. The objects in which this study was conducted are: a residential building and a low-capacity pumping station (up to 2000 m3 / h).