Abstract
The potential of a cogeneration system combined with a small combustion furnace was investigated in this study. The heat transfer between the exhaust gas and working fluid flowing in a spiral tube heat exchanger was estimated numerically and the amount of vapor generated was predicted. The combustion chamber had a 0.49 m3 inside volume with a chimney height of 2.5 m and an inner diameter of 0.28 m. A uniform gas side temperature condition that was referenced from the results of a preliminary experiment and a computational fluid dynamics simulation were adopted to simplify calculations and clarify the effects of working fluids. The amounts of heat recovery when utilizing water and other types of working fluids (Pentane, Butane) were compared. The most effective tube length considering pressure drop and phase change was also predicted. Isentropic theoretical thermal efficiency and T-s diagrams are analyzed to evaluate the vapor-power conversion rate using waste heat. As a result, a potential the heat recovery rate of approximately 100 kW at a 150 kg/h mass flow rate is expected.
Highlights
The practical use of cogeneration systems supplying both electric power and hot waste have been gradually increasing, especially in large-scale combustion facilities [1]
Previous studies regarding heat recovery can be classified into three major categories: those focused on heat exchangers [4,5,6,7,8], working fluids [9], and system performance [10,11]
This paper presents the results of numerical estimation on heat transfer between the working fluid flowing inside a spiral tube with a pressure drop and the uniform gas side temperature
Summary
The practical use of cogeneration systems supplying both electric power and hot waste have been gradually increasing, especially in large-scale combustion facilities [1]. In recent year, the high temperature type incinerator having several forced combustion burners have been developed, and these are expected to be make practical use as a heat recovery system so called "micro-cogeneration". The studies dealing with two-phase flow model and numerical simulation inside porous media are presented [12,13,14,15]. These studies help to understand heat transfer enhancement process and give the methodology for the development of latent heat recovery system with phase change process
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