Thermal energy recovery of air conditioning system––heat recovery system calculation and phase change materials development

Gu, Zhaolin; Liu, Hongjuan; Li, Yun

doi:10.1016/j.applthermaleng.2004.03.017

Cited by 106 publications

(41 citation statements)

References 6 publications

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“…[73][74][75][76] In this study, a PCM is used to capture the waste heat ejected from the condenser of an air conditioning unit and heat incoming cold water. Analysis is focused on using the finned tube heat exchanger to capture the waste heat, with different variations.…”

Section: Reference Overview Results/conclusionmentioning

confidence: 99%

A Key Review of Non-Industrial Greywater Heat Harnessing

2018

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Abstract:The ever-growing concerns about making buildings more energy efficient and increasing the share of renewable energy used in them, has led to the development of ultra-low carbon buildings or passive houses. However, a huge potential still exists to lower the hot water energy demand, especially by harnessing heat from waste water exiting these buildings. Reusing this heat makes buildings more energy-efficient and this source is considered as a third-generation renewable energy technology, both factors conforming to energy policies throughout the world. Based on several theoretical and experimental studies, the potential to harness non-industrial waste water is quite high.As an estimate about 3.5 kWh of energy, per person per day could be harnessed and used directly, in many applications. A promising example of such an application, are low temperature fourth generation District Heating grids, with decentralized sources of heat. At the moment, heat exchangers and heat pumps are the only viable options to harness non-industrial waste heat. Both are used at different scales and levels of the waste-water treatment hierarchical pyramid. Apart from several unfavourable characteristics of these technologies, the associated exergetic efficiencies are low, in the range of 20-50%, even when cascaded combinations of both are used. To tackle these shortcomings, several promising trends and technologies are in the pipeline, to scavenge this small-scale source of heat to a large-scale benefit.

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Section: Reference Overview Results/conclusionmentioning

confidence: 99%

A Key Review of Non-Industrial Greywater Heat Harnessing

2018

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“…Se discuten también otros trabajos relacionados sobre el tema y la técnica de medida de las propiedades termofisicas de estos materiales, con cálculo de transmisión de calor empleando la analogía eléctrica resuelta con ordenador, optimización de grandes tanques de acumulación y utilización de microencapsaulados en circuitos de enfriamiento (Barragán et al, 2002;Domínguez et al, 2008). Finalmente se analizan trabajos recientes relacionados con sistemas de acumulación con estos materiales y métodos de cálculo de las instalaciones de climatización con estos materiales (Sharma et al, 2007;Gu et al, 2004), con optimización de su empleo en la construcción (Darkwa et al, 2006;Carbonari et al, 2006;Kuznik et al, 2008) y varias otras aplicaciones (Sarı y Karaipekli, 2008;Alkan et al, 2008).…”

Section: Introductionunclassified

Aprovechamiento de los Materiales de Cambio de Fase (PCM) en la Climatización

Domínguez

Garćıa

2009

Inf. tecnol.

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ResumenSe analizan las posibilidades que presentan los materiales de cambio de fase en la acumulación de grandes cantidades de calor en espacios reducidos en el campo de la climatización. Se describen diversas instalaciones de climatización en donde se han incorporado de forma satisfactoria los materiales de cambio de fase (PCM), y se estudian diversos tipos de instalaciones tanto con sistemas de producción de energía térmica, como las que aprovechan el frío gratis del aire de forma directa (free cooling) o indirecta mediante sistemas evaporativos, o los que aprovechan calores residuales o cogeneración. Considerando las múltiples posibilidades que presentan los PCM, se concluye que su empleo se generalizará en el futuro. Palabras clave: materiales de cambio de fase, PCM, acumulación de calor, climatización, frío gratis Utilization of the Phase Change Materials (PCM) in the Air Conditioning AbstractThe possibilities that present phase change materials in the heat storage of big quantities of heat in reduced spaces in the field of the air conditioning are analyzed. Several installations of climatization are described where phase change materials (PCM) have been satisfactorily incorporated and diverse types of installations including systems of thermal energy production as well as those that take advantage of free cooling in direct form, or indirect form by means of evaporative systems, or those that take advantage of residual heats or cogeneration. Considering the multiple advantages of the PCM it is concluded that they will be widely used in the future.

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“…The above mentioned literature shows the positive effect and profound significance of combining PCM and solar energy technology in buildings on the thermal conditions of the space. Gu et al [11] proposed a heat recovery system using PCMs to recover the rejected heat from air-conditioning systems to produce domestic hot water for washing and bathing. The thermodynamic calculation showed that the integrative energy efficiency ratio of the system can be improved effectively when all rejected sensible and latent heat from air-conditioning systems can be recovered.…”

Section: Introductionmentioning

confidence: 99%

Comparative Research on Solar Phase Change Material Storage Wall Systems under Different Summer Working Conditions

Luo

et al. 2017

Energies

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Abstract:To study and analyze the performance characteristics and the effectiveness of the system under practical application scenarios, the present work compares the performance of solar energy phase change material storage wall systems suitable for buildings in hot summer and cold winter regions under different summer working conditions. The experimental facility was installed on light-weight insulation wall and ordinary wall; ventilation conditions of shutting/opening doors and windows, respectively, were set. The experimental facility showed different thermal characteristics when it was installed on insulation wall and on solid wall whether it was vented or not; under vented working condition, the temperature of the external surface of the south-facing wall which attached to the solid wall experimental system was lower, demonstrating that under practical building scenarios the present technology could better reveal its capability of avoiding the overheating issue of the solar heating wall in summer.

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Thermal energy recovery of air conditioning system––heat recovery system calculation and phase change materials development

Cited by 106 publications

References 6 publications

A Key Review of Non-Industrial Greywater Heat Harnessing

A Key Review of Non-Industrial Greywater Heat Harnessing

Aprovechamiento de los Materiales de Cambio de Fase (PCM) en la Climatización

Comparative Research on Solar Phase Change Material Storage Wall Systems under Different Summer Working Conditions

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