Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
Performance analysis of double cascade heat pump for industrial steam generation
Submission Author:
Lorena Guimarães , PE
Co-Authors:
Lorena Guimarães, Emmanuel Dutra, Luis Arturo Gómez Malagón
Presenter: Lorena Guimarães
doi://10.26678/ABCM.ENCIT2022.CIT22-0661
Abstract
The industrial sector is characterized by being the main consumer of thermal energy to meet the demands of process heat tied to its productive activities. Saturated water vapor is the most widespread working fluid to obtain these demands, given its high ability to transport large amounts of energy over long distances to a certain point of application. Conventionally, the industrial steam production process comes from wood-fired boilers or heaters using Liquefied Petroleum Gas. However, these devices generate amounts of waste heat, the energy waste of which not only increases production costs, but also contributes to the emission of gases and particles harmful to the environment. Thus, there is a need for innovation in the process, in order to develop the insertion of auxiliary devices that allow an improvement in the quality and productivity of steam generation in the sector. Heat pumps are electromechanical devices that are intended to transfer heat from a cold source to a hot source. Such devices can be used to meet both heating and cooling processes, which operate according to thermodynamic cycles of mechanical vapor compression. The main benefit of the application of pumps stems from the fact that established the thermal load, the mechanical energy supply represents only a fraction of the thermal load generated, which gives the process a high efficiency of operation in a single pass when compared with conventionally applied generation processes. Therefore, the objective of this work is to perform the thermal modeling of a system of double cascade heat pumps to perform steam generation. Thus, the proposed system requires the modeling of the coupling between the mechanical subsystems derived from this cascading arrangement, through energy balance techniques, in order to establish the thermodynamic characteristics, identifying and classifying their aspects of operation, in order to evaluate their efficiency. The modeling of the pump will be performed in Python in conjunction with the CoolProp tool, in order to obtain the thermophysical properties of the refrigerants. The technical analysis will start from the modeling of the proposed system operating under reversible conditions, analyzing the behavior of the system varying the refrigerant and operating conditions in order to establish the conditions limits of operation of the components related to their subsystems. Thus, it is expected to simulate the steam generation process with the aid of double cascade heat pumps aiming at the best energy use in the industrial sector.
Keywords
heat pump, steam generation, industrial processes
