Abstract
Heat recovering from biogas waste energy requires robust heat exchanger design. This paper presents the design of fuel gas-air heat exchanger (FGAHE) for recovering waste heat from biogas burning to regenerate desiccant material. Mathematical model was built to design the FGAHE based on logarithmic mean temperature difference (LMTD) and staggered tube bank heat transfer correlations. MATLAB code was developed to solve the algorithm based on overall heat transfer coefficient iteration technique. The effect on tube diameter on design and thermal characteristics of FGAHE is investigated. The results revealed that the smaller tube diameter leads to smaller heat transfer area and tube. On the other hand, the overall heat transfer coefficient and Nusselt numbers have larger rates at smaller tube diameter. In conclusion, the nominated tube diameter for FGAHE is the smaller diameter of 0.0127 m due to the high thermal performance.
Highlights
Efficient and economic thermal energy gained from the biomass waste, for drying application, requires specific thermal backup unit (TBU) and robust design of heat exchanger [1,2,3]
The design parameters of flue gas-air heat exchanger (FGAHE) is represented by the heat transfer area, copper tube length and number of tubes while the performance parameters involve overall heat transfer coefficient and heat exchanger effectiveness
The outer diameter of copper tubes which configures the tube bank of FGAHE is an important input parameter that required to be investigated from different design aspects
Summary
Efficient and economic thermal energy gained from the biomass waste, for drying application, requires specific thermal backup unit (TBU) and robust design of heat exchanger [1,2,3]. The challenge of designing appropriate flue gas-air heat exchanger (FGAHE) for recovering waste biomass energy used to regenerate desiccant material is still under investigation and development. Many previous researches had presented different designs of heat exchanger for different applications such as reactivation the silica gel by solar energy [4, 5]. Solar energy was used to regenerate the silica gel through a heat exchanger during the day time and after the sun hour using the flue gas from the thermal back up unit by using gas to gas heat exchanger [3, 9,10,11,12]
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