DETERMINATION OF THE PARAMETERS OF THE MATHEMATICAL MODEL OF THE WATER SUPPLY SYSTEM OF A HIGH-STORY BUILDING UNDER CHANGES IN THE INLET PRESSURE

Abstract

Prospects for improving the energy and resource efficiency of water supply systems have been studied. The peculiarities of the operation of the water supply system of a multi-story residential building under conditions of increased pressure at the entrance of the water supply system are analyzed.Mathematical and software tools have been developed for the formation of recommendations for the implementation of energy- and resource-saving approaches in the design of water supply systems of multi-story buildings. In order to develop a refined mathematical support for the development of recommendations for improving the energy efficiency of water supply systems, the water consumption calculations of a multi-story building were refined, and the expressions for the distribution of water consumption values by floor were obtained. The use of an indicator of the operating mode of the system is proposed and justified: consumer needs for water as the amount of water consumption at a minimum sufficient input pressure. According to the cyclogram of water consumption by users of the building, the need for water, which is the same for all floors, is determined. A methodology for calculating water consumption by each individual floor based on the experimental results of changes in water consumption of the building with changes in inlet pressure has been developed. The influence of the amount of excess pressure at the entrance of the house on the amount of water consumption by its residents was studied. It has been established that due to excess pressure in the system, for a seven-story building, for same resident's need for water, the difference in consumption between the first floor and the seventh floor can be 9%. The results of flow calculations for zero excess pressure at the water supply system inlet were obtained; the results of flow calculations for excess pressures corresponding to 1, 2, 3 and 4 atm were obtained. For the studied example of a seven-story building, the probable annual increase in water consumption for each of the above-mentioned excess pressures, which are 4718, 9400, 14070 and 18696 m3, respectively, was calculated.