Heat transfer measurement in a three-phase spray column direct contact heat exchanger for utilisation in energy recovery from low-grade sources

Baqir, Ali Sh.; Mahood, Hameed B.; Hameed, Mudher S.; Campbell, Alasdair N.

doi:10.1016/j.enconman.2016.08.013

Cited by 24 publications

(8 citation statements)

References 30 publications

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“…For the purpose of verifying and validating the CFD model, it was decided to rely on the experimental results published in Baqir et al (Baqir, Mahood, Hameed, & Campbell, 2016). In this section, an overview of the experimental setup is provided.…”

Section: Methodsmentioning

confidence: 99%

“…In this section, an overview of the experimental setup is provided. For further details, see (Baqir, Mahood, Hameed, & Campbell, 2016) and (Baqir A. M., 2016).…”

Section: Methodsmentioning

confidence: 99%

“…The computer-aided design (CAD) geometry of the experimental setup had to be created from scratch through identifying relevant geometrical details from Baqir et al (Baqir, Mahood, Hameed, & Campbell, 2016). It was determined that modeling a quarter of the full geometry was sufficient to capture the physics using symmetry planes to support our verification and validation objectives.…”

Section: Geometry and Computer-aided Design (Cad) Modelmentioning

confidence: 99%

See 2 more Smart Citations

High-Performance Computing to Enable Next-Generation Low-Temperature Waste Heat Recovery

Delchini¹,

Rao²,

Ahmad³

et al. 2021

Preprint

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Section: Methodsmentioning

confidence: 99%

“…In this section, an overview of the experimental setup is provided. For further details, see (Baqir, Mahood, Hameed, & Campbell, 2016) and (Baqir A. M., 2016).…”

Section: Methodsmentioning

confidence: 99%

Section: Geometry and Computer-aided Design (Cad) Modelmentioning

confidence: 99%

See 1 more Smart Citation

High-Performance Computing to Enable Next-Generation Low-Temperature Waste Heat Recovery

Delchini¹,

Rao²,

Ahmad³

et al. 2021

Preprint

View full text Add to dashboard Cite

“…Considering the main purpose of HEF is to enhance the in-cylinder heat transfer, HEF with high thermal diffusion and heat capacity, while having low toxicity, is desirable for the application. Liquid-gas direct-contact heat and mass transfer processes can be found in numerous industrial applications such as water desalination by freezing, geothermal power energy production, crystallisation, waste heat recovery, energy storage systems, solar power energy and emergency cooling of chemical and nuclear reactors [14][15][16][17][18]. Due to vastly different geometries and potentially highly turbulent flow fields (as in the LN 2 engine), numerical models of direct contact heat exchangers in the literature [19][20][21][22] were applicable only to simplified conditions, and very limited quantitative experimental results were available for their validation [20].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Heat Exchange Fluid Composition on the Performance of a Liquid Nitrogen Engine System

et al. 2021

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It has been proven that performance gains in liquid nitrogen (LN2) engine systems, generating simultaneous cooling and auxiliary power, can be achieved through integration of a dedicated heat exchange fluid (HEF) circuit. The novel, HEF enhanced LN2 engine system can be utilised as an optimised hybrid solution for commercial refrigeration trucks. Although the benefits arising from HEF addition have been researched, there are no articles investigating the effect of changing the HEF composition on engine performance. This article reports a detailed experimental investigation on the performance of a novel, HEF enhanced LN2 engine system. The key contribution of the current study is the knowledge generated from investigating the impact of different HEF compositions on the engine performance under different HEF temperatures, N2 inlet conditions and engine speeds. The HEF composition was varied through changing the water content in the mixture. A thermodynamic model based on an idealised cycle was used to assist interpretation of the experimental results and assess the potential of the proposed engine architecture. The experimental study demonstrated up to 42.5% brake thermal efficiency, up to 2.67 kW of brake power and up to 174 kJ/kg specific energy, which were higher than previously published figures for LN2 engine systems. A reduction in the HEF water content was found to generally increase the engine power output at a HEF temperature of 30 °C. However, at a HEF temperature of 60 °C, the impact of HEF composition was found to be minor and nonmonotonic. The thermodynamic model predicted the upper and lower limits of the measured indicated power and indicated thermal efficiency with acceptable accuracy.

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“…It has been reported that the DCHE-based ORC system allows better exploitation of low-grade heat than existing ORC systems. 19,20 The thermodynamic performance of the DCHE-based ORC system is strongly relied on the bubbles mixing and heat transfer processes. However, a greatly coupled association with each other exists in the two physical processes.…”

Section: Introductionmentioning

confidence: 99%

Interplay of fluids mixing and heat transfer in a dual-loop ORC direct contact heat exchanger used for waste heat utilization

Xiao

Luo

Huang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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By bringing two immiscible fluids at different temperatures into a direct contact heat exchanger (DCHE), bubble swarms are produced in the dual-loop ORC direct contact boiling heat transfer process. The aim of this paper is to make effort to explore the interplay between mixing state quality and heat transfer performance of fluids in the DCHE. Through flow visualization of this mixing process, a simple image analysis technique is introduced to represent the formation and evolution of vapor around the injected coolant droplets. Description of the boiling heat transfer process is here achieved by average volumetric heat transfer coefficient (VHTC). Experimental results attest that the proposed mixing index is powerful and sufficient compared with the Betti numbers method for the mixing quality quantification of bubbles inside DCHE. The synergistic association between the fluids mixing process and the heat transfer process is investigated by statistical regression model of new mixing index and VHTC. The contributions, including the data from monitoring practice in ORC heat transfer system and the proposed way, are presented to delve into the transient behaviors comparison of various fluids mixing and heat transfer processes conveniently.

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Heat transfer measurement in a three-phase spray column direct contact heat exchanger for utilisation in energy recovery from low-grade sources

Cited by 24 publications

References 30 publications

High-Performance Computing to Enable Next-Generation Low-Temperature Waste Heat Recovery

High-Performance Computing to Enable Next-Generation Low-Temperature Waste Heat Recovery

The Effect of Heat Exchange Fluid Composition on the Performance of a Liquid Nitrogen Engine System

Interplay of fluids mixing and heat transfer in a dual-loop ORC direct contact heat exchanger used for waste heat utilization

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