Determination of power and energy characteristics of variable speed pumps in water supply systems with hydraulic diaphragm tanks

Abstract

The purpose of the research is to determine the working areas of hydraulic diaphragm tanks, including high-capacity ones, regardless of the characteristics of pumping equipment and water consumption, including using a frequency converter. This article presents the test results of the water supply system separately from the tank and together with it at 100% pump speed and at lower frequencies up to 60%. Currently, hydraulic membrane tanks have become an effective analogue of water towers for small farms: private homes, schools, hospitals, etc. They allow you to properly control the operation of pumping equipment, regulating its flow rate and pressure, as well as reducing its wear. However, there is a problem with the correct selection and configuration of the tank, as many water consumers do not know what specific flow rate and pressure they need. Accordingly, the issue of energy efficiency arises – the wrong choice of tank can lead to significant energy costs, and hence to monetary losses. The article presents the test results of membrane tanks when working together without and with a frequency converter, provides formulas for calculating and predicting the areas of operation of such systems that are suitable for any tank and allow calculating the power and energy characteristics of water supply systems with pneumatic tanks and frequency converters.