Development of Nusselt correlation for heat transfer studies in vertical transport duct using limestone and chalcopyrite for waste heat recovery

2021 ◽  
Author(s):  
Ashok Kumar Popuri ◽  
Pramod Kaki ◽  
Venkata Swamy Nalajala ◽  
Subbaiah Tondepu
Keyword(s):  
Heat Transfer ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Vertical Transport

scholarly journals Suppressing sub-bandgap phonon-polariton heat transfer in near-field thermophotovoltaic devices for waste heat recovery

2015 ◽  
Vol 107 (9) ◽  
pp. 091106 ◽  
Author(s):  
Kaifeng Chen ◽  
Parthiban Santhanam ◽  
Shanhui Fan
Keyword(s):  
Heat Transfer ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Near Field

Heat Transfer and Pressure Drop Investigations of the Compact Exhaust Heat Exchanger With Twisted Tape Inserts for Automotive Waste Heat Utilization

2020 ◽  
Vol 13 (4) ◽  
Author(s):  
Dhruv Raj Karana ◽  
Rashmi Rekha Sahoo
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Internal Heat ◽  
Decisive Role ◽  
Twisted Tape ◽  
Twisted Tapes ◽  
Exhaust Heat

Abstract Thermoelectric-based waste heat recovery is a competent technique to reduce the exhaust emissions and fuel consumption of automobiles. Thermal and hydraulic characteristics of the exhaust heat exchanger plays a decisive role in the extent of waste heat recovery from the exhaust gas. In this study, the exhaust heat exchanger having twisted tape inserts is proposed to increase the internal heat transfer coefficient. The dimensionless Nusselt number and friction factor were evaluated experimentally for different designs of the twisted tapes. The experiments were performed for the Reynolds number in the range 2300–25000. The considered geometric parameters of the twisted rib explored were the pitch fraction, twist fraction, and slope. The obtained results were compared to reveal the best feasible design of the twisted tape. The maximum net thermohydraulic efficiency factor achieved for the system in the present analysis is 1.93. With the use of twisted tapes, the area of the exhaust heat exchanger can be greatly reduced for the same power output as flat geometry. This would help for the integration of the waste heat recovery with the engine, where the space available is very limited.

Oscillating Heat Pipes for Waste Heat Recovery in HVAC Systems

2015 ◽  
Author(s):  
Govinda Mahajan ◽  
Heejin Cho ◽  
Scott M. Thompson ◽  
Harrison Rupp ◽  
Kevin Muse
Keyword(s):  
Heat Transfer ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Heat Pipes ◽  
Hvac Systems ◽  
Operating Conditions ◽  
Working Fluid ◽  
Low Grade ◽  
Potential Cost

Oscillating heat pipes (OHPs) were experimentally assessed as a passive-type heat transfer device for air-to-air heat exchange in a typical Heating Ventilation & Air conditioning system (HVAC) with adjacent air streams at different temperatures. The objective is to utilize, otherwise wasted thermal energy to pre-heat or pre-cool air in order to reduce the payload on HVAC systems, thus reducing energy consumption. OHPs can achieve effective thermal conductivities on-the-order of 10,000 W/m-K via no internal wicking structure and hence can perform aforementioned heat transfer task while providing an aerodynamic form factor. A unique working fluid with limited research inside OHPs, but with properties desirable for low grade heat fluxes, i.e. n-pentane with 70 % fill ratio, was chosen as the working fluid to achieve maximum heat transfer. Aerodynamic performance, in terms of pressure drop, was evaluated and juxtaposed with heat transfer gain/loss. The OHP thermal performance and total heat transfer for hot-environment HVAC operation was benchmarked with an empty/evacuated OHP with same overall dimensions. Results indicate that the current, atypically-long OHP is fully-capable of operating in the air-to-air convection mode for waste heat recovery for typical HVAC operating conditions. Since the OHP is passive, cost effective, and relatively aerodynamic (no fins were used), the potential cost savings for its integration into HVAC systems can be significant.

scholarly journals Heat Transfer Characteristics of Calcined Petroleum Coke in Waste Heat Recovery Process

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Bin Zheng ◽  
Yongqi Liu ◽  
Lichen Zou ◽  
Ruiyang Li
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Petroleum Coke ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Recovery Process ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Calcined Petroleum Coke

This paper reports the results of heat transfer characteristics of calcined petroleum coke in waste heat recovery process. The model of heat exchanger was set up. The model has been used to investigate the effects of porosity (0.58 to 0.79), equivalent heat conductivity coefficient (0.9 to 1.1), and equivalent specific heat (0.9 to 1.1). The calculated values of calcined petroleum coke temperature showed good agreement with the corresponding available experimental data. The temperature distribution of calcined petroleum coke, the calcined petroleum coke temperature at heat exchanger outlet, the average heat transfer coefficient, and the heat recovery efficiency were studied. It can also be used in deriving much needed data for heat exchanger designs when employed in industry.

Heat transfer of calcined petroleum coke and heat exchange tube for calcined petroleum coke waste heat recovery

Energy ◽  
2018 ◽  
Vol 155 ◽  
pp. 56-65 ◽  
Author(s):  
Bin Zheng ◽  
Peng Sun ◽  
Yongqi Liu ◽  
Qiang Zhao
Keyword(s):  
Heat Transfer ◽  
Heat Exchange ◽  
Petroleum Coke ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Heat Exchange Tube ◽  
Calcined Petroleum Coke

Waste heat recovery & heat transfer experience in cement

2016 ◽  
Author(s):  
Dan Ramshaw ◽  
Giovanni Caniato ◽  
Giorgio Carboni ◽  
Charles Leivo
Keyword(s):  
Heat Transfer ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat

Efficient waste heat recovery system for high-temperature solid particles based on heat transfer enhancement

2019 ◽  
Vol 155 ◽  
pp. 166-174 ◽  
Author(s):  
Binfan Jiang ◽  
Dehong Xia ◽  
Hao Guo ◽  
Linshu Xiao ◽  
Hengyu Qu ◽  
...  
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Solid Particles ◽  
Transfer Enhancement ◽  
Waste Heat Recovery System ◽  
Recovery System ◽  
Heat Recovery System
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