A Review of single-effect solar absorption chillers and its perspective on Lebanese case

Lahoud, Christy; Brouche, Marwan; Lahoud, Chawki; Hmadi, Mohamed

doi:10.1016/j.egyr.2021.09.052

Cited by 14 publications

(7 citation statements)

References 47 publications

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“…In the absorption chiller side, the hot HTF provides the necessary heat for driving the chiller generator and to maintain the stable operation of the solar air-conditioning system. The considered commercial water-lithium bromide (H 2 O-LiBr) absorption chiller type has a nominal cooling capacity of 160 kW and an average coefficient of performance (COP) of 1.3 [12]. It is interesting to note this double-effect absorption chiller is chosen due to its high COP compared to the single-effect absorption chiller and its ability to provide high cooling capacities [3,18].…”

Section: Charging and Cooling Periodmentioning

confidence: 99%

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Dynamic Investigation of a Coupled Parabolic Trough Collector–Phase Change Material Tank for Solar Cooling Process in Arid Climates

2023

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The use of solar energy for cooling processes is advantageous for reducing the energy consumption of conventional air-conditioning systems and protecting the environment. In the present work, a solar-powered cooling system with parabolic trough collectors (PTC) and a phase change material (PCM) tank is numerically investigated in the arid climates of Saudi Arabia. The system contains a 160-kW double-effect absorption chiller powered by solar-heated pressurized water as a heat transfer fluid (HTF) and a shell and tube PCM as a thermal battery. The novelty of this paper is to investigate the feasibility and the potential of using a PTC solar field coupled to a PCM tank for cooling purposes in arid climates. The numerical method is adopted in this work, and a dynamic model is developed based on the lumped approach; it is validated using data from the literature. The functioning of the coupled system is investigated in both sunshine hours (charging period) and off-sunshine hours (discharging period). The PTC area in this work varies from 200 m2 to 260 m2 and the cooling capacity of the chiller ranges from 120 kW to 200 kW. Obtained results showed that the 160-kW chiller is fully driven by the 240 m2-solar PTC during the charging period and about 23% of solar thermal energy is stored in the PCM tank. It was demonstrated that increasing the PTC area from 220 m2 to 260 m2 leads to a reduction in the PCM charging time by up to 45%. In addition, it was found that an increase in the cooling loads from 120 kW to 200 kW induces a decrease in the stored thermal energy in the PCM tank from 450 kWh to 45 kWh. During the discharging period, the PCM tank can continue the cooling process with a stable delivered cooling power of 160 kW and an HTF temperature between 118 °C and 150 °C. The PCM tank used in the studied absorption chiller leads to a reduction of up to 30% in cooling energy consumption during off-sunshine hours.

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Section: Charging and Cooling Periodmentioning

confidence: 99%

“…Ramadas et al [11] studied the use of a solar absorption chiller for student residential buildings in Australia. Lahoud et al [12] examined the use of a single-effect absorption chiller. Moreover, the authors carried out a thermo-economic feasibility analysis for a 700-kW sports stadium.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Investigation of a Coupled Parabolic Trough Collector–Phase Change Material Tank for Solar Cooling Process in Arid Climates

2023

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“…Ayou and Coronas have proposed a total investment cost of around 4200 Euros (without VAT) for an absorption chiller (type A25s and its annual maintenance cost is 20 Euros, which is equivalent to almost 1680 Euros/kW of cold production [ 31 ]. Due to the complicated nature of the technology and the requirement for a separate solar thermal system, solar-assisted absorption chillers often have a more significant capital cost than other renewable energy-based cooling systems [ 32 ]. The cycle is powered by solar energy, which lowers the costs and consumption of electricity.…”

Section: Solar Thermal Absorption Coolingmentioning

confidence: 99%

Resurrection of carbon dioxide as refrigerant in solar thermal absorption cooling systems

Dilshad

Abas

Hasan

2023

Heliyon

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“…However, the displayed studies should work based on certain and limited conditions such as the generator temperature and performance which are required to be improved. Now, the challenge is looking for ways to improve the performance of the single effect absorption chiller and if possible lowering its operating temperature to be valid to conjugate with waste heat sources such as solar energy [9][10][11][12]. In general, the operation temperature of the single effect absorption chiller is rounded between 80 and 100℃ [13,14] while its coefficient of performance is rounded between 0.5 and 0.7 [15].…”

Section: Introductionmentioning

confidence: 99%

“…He also could operate the system with a range of 90℃ -120℃ but the COP is still low (= 0.76). Single effect absorption chiller is the simplest in configuration among the other types of chillers and consists of the least number of connected devices, so that, it could be the cheapest chiller [28], its lower the operation temperature, therefore it could operate with low grade heat source such as solar energy [10,29]. For these reasons, a Single effect LiBr-H2O chiller will be adopted among the other types of chillers.…”

Section: Introductionmentioning

confidence: 99%

Compressor-Aid Absorption Chiller Working on Low Grade Temperature Heat Source: A Thermodynamic Analysis

Naji,

Altayee

2023

IJHT

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Searching for new technology to exploit the wasted heat is continuing. Using absorption chillers is a promising technology. Single-effect LiBr-H2O absorption chillers represent the simplest type. These chillers have low efficiency and use high operation temperatures. In this study, a new modification is suggested to improve the efficiency and lower the generator (inlet) temperature, so the developed machine can use the wasted heat to generate a cooling load. The suggested modification concludes by inserting a small compressor between the generator and the condenser, so that, the pressure will be reduced in the generator which reduces the temperature while increasing the condenser pressure will lead to increase the vapor condensation (increasing the chiller performance). The results of the modified model of the device showed that the operating temperature could be reduced from 100℃ to 90℃ while the performance increased from 0.721 to 0.803. Moreover, the cooling capacity could be increased from 10.575 kW to 15.278 kW. These results promote the possibility to operate the suggested form of absorption chillers with low-grade temperature heat sources such as solar energy or wasted heat from industries.

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A Review of single-effect solar absorption chillers and its perspective on Lebanese case

Cited by 14 publications

References 47 publications

Dynamic Investigation of a Coupled Parabolic Trough Collector–Phase Change Material Tank for Solar Cooling Process in Arid Climates

Dynamic Investigation of a Coupled Parabolic Trough Collector–Phase Change Material Tank for Solar Cooling Process in Arid Climates

Resurrection of carbon dioxide as refrigerant in solar thermal absorption cooling systems

Compressor-Aid Absorption Chiller Working on Low Grade Temperature Heat Source: A Thermodynamic Analysis

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