Residential solar air conditioning: Energy and exergy analyses of an ammonia–water absorption cooling system

Aman, Julia; Ting, David S.‐K.; Henshaw, Paul

doi:10.1016/j.applthermaleng.2013.10.006

Cited by 129 publications

(43 citation statements)

References 25 publications

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“…It uses an absorber and a generator instead of the compressor. Therefore, no electrical power is needed to pressurize the refrigerant (water or ammonia) [7]. In fact, the refrigerant is first absorbed in an absorbing material and then pressurized in the absorbed liquid phase.…”

Section: Solar Absorption Systemsmentioning

confidence: 99%

“…Thereby, absorption systems contribute to reducing the greenhouse gas emissions to the atmosphere and the energy costs. Nonetheless, they have a low coefficient of performance (COP) (between about 0.3 and 0.75 according to the cooling capacity) compared with the electrical vapor compression AC systems that their COP can reach up to 3 [7].…”

Section: Solar Absorption Systemsmentioning

confidence: 99%

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Solar Air-Conditioning Systems

Aridhi¹,

H'mida²,

Mami³

2018

Sustainable Air Conditioning Systems

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The chapter presents the recent studies focusing on optimizing the efficiency of air-conditioning (AC) systems using solar energy. For this purpose, several advanced AC plants (absorption, adsorption, and desiccant) are designed. Their technology and components are described in this chapter. It also discusses the energy intake of the solar energy use in airconditioning, especially in rural regions where the electricity shortage is frequent, as well as the reduction of the energy costs and the pollution rate. A comparison between solar AC systems and traditional AC systems at the level of the designs, costs, and effectiveness is made at the end of the chapter.

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Section: Solar Absorption Systemsmentioning

confidence: 99%

Section: Solar Absorption Systemsmentioning

confidence: 99%

Solar Air-Conditioning Systems

Aridhi¹,

H'mida²,

Mami³

2018

Sustainable Air Conditioning Systems

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“…The use of renewable and abundant solar radiation is proposed as a suitable alternative, particularly for remote areas or areas suffering from electricity shortage [3]. Another source of energy that could be considered is to reuse industrial waste heat to drive refrigeration cycles.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Compression-Absorption Chiller Driven by low Temperature Waste Heat: Modelling and Analysis

Loeb¹

2018

Int. J. Green Technol.

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Abstract:The aim of this study is to model and investigate the concept of a hybrid ammonia-water absorption chiller. Its particularity is having a compressor that creates an intermediate pressure at the desorber. This modification should increase the flexibility of the machine, allowing the recovery of lower temperature waste heat. A preliminary simulation was based on a single stage commercial 10 kW ammonia-water absorption chiller. An experimental study was completed to validate the numerical model of a traditional single stage absorption chiller. The comparative energy and exergy analysis of the hybrid and traditional absorption chillers was undertaken. Due to the reduction of the waste heat temperature for the hybrid chiller, the exergy efficiency increases by 34%. A 38% reduction of the UA coefficient (the product of overall heat transfer coefficient and heat exchanger area), for the same waste heat temperature and refrigeration power, is shown for the hybrid system compared with the traditional one. The theoretical lower bound of the waste heat temperature to be used to drive a hybrid cycle is 42 °C. An economic analysis shows that a hybrid cycle is initially more expensive but quickly becomes profitable compared to a gas-fired absorption machine.

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“…The developed model is based on energy, mass and species conservation equations. General forms of these equations are specified as [4,7]:…”

Section: System Modelingmentioning

confidence: 99%

“…Approximately 80% of the world's electricity is generated by using fossil fuels that significantly enhance CO 2 emissions, leading to augment the global warming [2]. Furthermore, many developing countries face a shortage of electricity supply [3], particularly during the summer when the need for refrigeration and air-conditioning is obviously increased [4]. On the other hand, many countries enjoy abundant amounts of solar energy, which is freely available throughout the year [5].…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Parametric Study of a Solar Absorption Refrigeration System to Lower Its Cut In/Off Temperature

Mohammed

Yanling

2017

Energies

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Solar-driven ammonia-water absorption refrigeration system (AARS) has been considered as an alternative for the conventional refrigeration and air-conditioning systems. However, its high initial cost seems to be the main problem that postpones its wide spread use. In the present study, a single-stage NH 3 /H 2 O ARS is analyzed in depth on the basis of energetic and exergetic coefficients of performance (COP and ECOP, respectively) to decrease its cut in/off temperature. This study was carried out to lower the required heat source temperature, so that a less-expensive solar collector could be used. Effects of all parameters that could influence the system's performance and cut in/off temperature were investigated in detail. Presence of water in the refrigerant and evaporator temperature glide was considered. Results revealed that appropriate selection of system's working condition can effectively reduce the driving temperature. Besides, the cut in/off temperature can be significantly decreased by inserting an effective solution heat exchanger (SHX). Required driving temperature can be lowered by up to 10 • C using SHX with 0.80 effectiveness. The results also showed that effects of water content in the refrigerant could not be neglected in studying NH 3 /H 2 O ARS because it affects both COP and ECOP. Additionally, a large temperature glide in the evaporator can substantially decrease the ECOP.

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Residential solar air conditioning: Energy and exergy analyses of an ammonia–water absorption cooling system

Cited by 129 publications

References 25 publications

Solar Air-Conditioning Systems

Solar Air-Conditioning Systems

Hybrid Compression-Absorption Chiller Driven by low Temperature Waste Heat: Modelling and Analysis

Comprehensive Parametric Study of a Solar Absorption Refrigeration System to Lower Its Cut In/Off Temperature

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