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Exergy transfer effectiveness on heat exchanger for finite pressure drop

Wu, Shuang-Ying; Yuan, Xiao-Feng; Li, You-Rong; Xiao, Lan - In: Energy 32 (2007) 11, pp. 2110-2120

In this paper, exergy transfer effectiveness is defined to describe the performance of heat exchangers operating above … transfer units number, the ratio of the heat capacity of cold fluids to that of hot fluids and flow patterns on exergy transfer … effectiveness of heat exchangers. Furthermore, the results of exergy transfer effectiveness with a finite pressure drop are compared …

Persistent link: https://www.econbiz.de/10010808678

Thermo-mechanical life prediction for material lifetime improvement of an internal cooling system in a combustion liner

Kim, Kyung Min; Jeon, Yun Heung; Yun, Namgeon; Lee, … - In: Energy 36 (2011) 2, pp. 942-949

This paper is concerned with heat transfer analysis and life prediction in the after shell section of a gas turbine combustion liner with internal cooling passage. The method in the present study is the process to design cooling systems which enhance the material lifetime as well as the cooling...

Persistent link: https://www.econbiz.de/10010808791

Using nanofluids in enhancing the performance of a novel two-layer solar pond

Al-Nimr, Moh'd A.; Al-Dafaie, Ameer Mohammed Abbas - In: Energy 68 (2014) C, pp. 318-326

A novel two-layer nanofluid solar pond is introduced. A mathematical model that describes the thermal performance of the pond has been developed and solved. The upper layer of the pond is made of mineral oil and the lower layer is made of nanofluid. Nanofluid is known to be an excellent solar...

Persistent link: https://www.econbiz.de/10010809035

Targeting and design of CWNs (cooling water networks)

Shenoy, Akshay U.; Shenoy, Uday V. - In: Energy 55 (2013) C, pp. 1033-1043

CWNs (cooling water networks) are targeted and designed in this work by an analytical approach requiring no graphical procedures. The key basis for the approach is the conversion of the cooling duties to equivalent inlet–outlet (demand–source) pairs. The UTA (Unified Targeting Algorithm) is...

Persistent link: https://www.econbiz.de/10010809073

Variational principles in terms of entransy for heat transfer

Xu, Mingtian - In: Energy 44 (2012) 1, pp. 973-977

A variational principle for heat conduction is formulated which results in the steady state heat conduction equation established from the Fourier law. Furthermore based on the thermodynamics in terms of entransy a more general functional is defined for incompressible fluids. We show that...

Persistent link: https://www.econbiz.de/10010809304

Heat transfer in a twin-screw multiphase pump: Thermal modeling and one application in the petroleum industry

Nakashima, Celso Y.; de Oliveira, Silvio; Caetano, E.F. - In: Energy 31 (2006) 15, pp. 3415-3425

This paper presents a model of the heat transfer processes in the casing and rotors of a twin-screw multiphase pump. The model was developed to study the influence of temperature rise in the subsea multiphase pumping system-500 (SMPS), being developed by Petrobras, that operates with a...

Persistent link: https://www.econbiz.de/10010809796

The flow and heat transfer characteristics of supercritical CO2 leakage from a pipeline

Li, Kang; Zhou, Xuejin; Tu, Ran; Xie, Qiyuan; Jiang, Xi - In: Energy 71 (2014) C, pp. 665-672

The pipeline leakage process of supercritical CO2 involves complex phenomena because of the high inner pressure and the multiphase choked flow near the leakage point. In this work, an experimental facility was developed to investigate the thermodynamic and fluid dynamic behaviour in pressurized...

Persistent link: https://www.econbiz.de/10010809945

Entropy generation analysis of heat and mass transfer in mixed electrokinetically and pressure driven flow through a slit microchannel

Matin, Meisam Habibi; Khan, Waqar Ahmed - In: Energy 56 (2013) C, pp. 207-217

The entropy generation analysis of heat and mass transfer in a slit microchannel is performed in this study. The flow is assumed to be due to a combination of the electroosmotic body force and the pressure gradient. A fully developed flow with uniform flux at the surface is considered in the...

Persistent link: https://www.econbiz.de/10010810009

Effects of operating variables on heat transfer and energy consumption of a household refrigerator-freezer during closed door operation

Hasanuzzaman, M.; Saidur, R.; Masjuki, H.H. - In: Energy 34 (2009) 2, pp. 196-198

Refrigerator-freezers play an important role in the preservation of perishable food in warm and humid climates. Experiments were conducted in a controlled chamber to investigate the effects of the ambient temperature, cabinet load, thermostat setting and an open surface water pan on the heat...

Persistent link: https://www.econbiz.de/10010810238

A global optimization method for evaporative cooling systems based on the entransy theory

Yuan, Fang; Chen, Qun - In: Energy 42 (2012) 1, pp. 181-191

Evaporative cooling technique, one of the most widely used methods, is essential to both energy conservation and environment protection. This contribution introduces a global optimization method for indirect evaporative cooling systems with coupled heat and mass transfer processes based on the...

Persistent link: https://www.econbiz.de/10010810338