Determinação da altura manométrica em instalações de bombeamento operando com diferentes fluidos de trabalho e temperaturas variáveis

Abstract

Electropumps are widely used in industrial and commercial installations. In the industry they are used to serve refrigeration, lubrication, process fluid transport and hydraulic systems. In the commercial sector they are mainly used in heating and air conditioning systems, in addition to being used in transportation systems and water treatment and sanitary sewage. These equipments represent a good part of the electric energy consumption in the systems in which they are used, often due to oversizing due to the lack of reliable information to evaluate the load losses in pipelines. Due to this, a spreadsheet was developed, bringing together data of physical properties of several experimentally determined fluids, as well as more reliable methods for determining the pressure loss in pipe fittings to perform the lifting of the manometric height in a pumping system in a more close to the real one still in the project phase. The spreadsheet was applied to determine the manometric height of a pump used in an oil pump system of a margarine plant and the results were compared to the calculations performed at the time of the design of the system in 2014. By analyzing these values, a reduction of 34% in the calculated value for the system's loss of load. It is concluded that the use of experimentally determined methods and data results in smaller values ​​compared to theoretical methods, which contributes to the design and selection of non-oversized equipment, favoring system operation and reducing energy, maintenance and acquisition costs.