Abstract
The problem of global warming and the reduction of energy consumption have led to an evolutionary progress of research directed towards finding as many solutions as possible to these environmental issues. Firstly, this paper presents the background information on the role of wastewater as a source of heat for the future. Next, the paper includes the analysis elements that define a system for recovering thermal energy from wastewater. The main objective was to identify the parameters that determine the heat transfer. It has started from a conceptual model of the technological system that involves inputs and outputs characterized by technological, physical-chemical, measurable or imposed properties. In the second part this paper presents a numerical model elaborated for the analysis and simulation of the main physical processes, the mass and heat transfer, which underlie the operation of the heat pipe heat exchangers (HPHE). The numerical simulation of heat and mass transfer in the HPHE is computed by using Delphi 7 solver program. This program contained a series of sub-programs for the meshing of the field occupied by the HPHE, another subprogram for solving the meshing equations and the third for post processing. The design of HPHE is the key to provide a heat exchanger system to work proficient as expected. Finally, the result is used to optimize and improving heat recovery systems of the increasing demand for energy efficiency in residential buildings or industry.
Highlights
One of the secondary energetic resources that on which a greater accent has been put worldwide are wastewaters
The current paper presents results of research obtained from simulation and numerical analysis of heat recovery from wastewater using a heat pipe heat exchangers (HPHE)
The program used in the heat and mass transfer simulation was done in the Delphi 7 programming language, which is a variant of the Turbo Pascal language
Summary
One of the secondary energetic resources that on which a greater accent has been put worldwide are wastewaters (liquid waste). The recovery of secondary energetic resources and of liquid waste with high energetic content led to the development and implementation of various types of heat exchangers and heat recuperators [4, 5]. Heat exchangers are widely used in the industry, transportation, constructions, thermal power plants, heating and air conditioning systems, electronic equipment In all these applications, improving the efficiency of heat recovery can lead to substantial reduction of costs of production and use. Worldwide there are a series of papers that deal with theoretical and experimental research of the physical processes associated with the various types of heat exchangers, and more recently a great emphasis is placed on the use of numerical models [10,11,12]. It is important to note that these numerical models are improved based on the results of experimental research [14,15,16,17]
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