Performance assessment of a solar-assisted absorption-compression system for both heating and cooling

Chen, Erjian; Xie, Mingxi; Jia, Ting; Zhao, Yao; Dai, Yanjun

doi:10.1016/j.apenergy.2022.120238

Cited by 11 publications

(4 citation statements)

References 34 publications

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“…There are several solar collector technologies applied in absorption air conditioning systems such as flat plate collector (FPC), Evacuated tube collector (ETC), and Parabolic Trough Collector (PTC) (Kim and Infante Ferreira 2008). In addition, several research have been carried out on solar collectors for heating and radiative cooling by applying selective materials on their surfaces (Chen et al 2022a;M. Hu et al 2018a;2018b;2016;Wang et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Reducing Cooling Water Consumption in a Solar Absorption Chiller for Mali Climates

Camara

Sulin

2023

Preprint

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Air conditioning systems based on solar energy can be considered today as an alternative to air conditioning systems with electrical mechanical compressions to reduce building energy consumption from fossil energy sources and achieve climate change goals. This paper proposes a new concept for the efficient use of an absorption cooling system with a wet cooling tower and a type of dual-acting combined collector for DSH and NRC in accordance with the climatic conditions of Bamako. The operation of a type of dual-acting combined collector and cooling tower was studied throughout the year. The solar energy generated by the dual-acting combined collector on the first day of operation heats the water in the storage tank 1 to 80 °C after 6 to 7 hours of operation, and on subsequent days this time is reduced by 3 to 4 hours depending on the weather conditions. Thus, a dual-acting combined collector allows the system to provide cooling for an average of 8 hours per day throughout the year. The water in the cold-water tank, cooled by night radiation into space, ensures operation without turning on the cooling tower for an average of 73 minutes per day. The wet cooling tower efficiency is about 0.86, and the annual water savings in cooling tower losses due to the night operation of the dual-acting combined collector is estimated at about 35 m3.

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Section: Introductionmentioning

confidence: 99%

Reducing Cooling Water Consumption in a Solar Absorption Chiller for Mali Climates

Camara

Sulin

2023

Preprint

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“…Considering infiltration, a value of 0.1 air change per hour was chosen. For the calculation of ventilation air, reference is made to UNI 10339 [28]. It is applied to aeraulic systems intended for the well-being of people that are installed in closed buildings.…”

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confidence: 99%

“…This, in turn, feeds an absorption machine that produces cold water that is sent to the system to cool the rooms. Within the system, there is also a cooling tower or, alternatively, a dry cooler, which can dissipate the excess heat produced by the solar panels [28]. The modeling of the case study in its current state provided a snapshot of the starting conditions.…”

mentioning

confidence: 99%

“…This, in turn, feeds an absorption machine that produces cold water that is sent to the system to cool the rooms. Within the system, there is also a cooling tower or, alternatively, a dry cooler, which can dissipate the excess heat produced by the solar panels [28]. The absorption machine used in the project is lithium bromide, which has water as the solute and lithium bromide as the solvent, so in this case, the refrigerant gas is water vapor.…”

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Energy Analyses and Optimization Proposals for Hotels in Sicily: A Case Study

Guercio,

Curto,

Franzitta

et al. 2023

Sustainability

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The recent post-pandemic period has economically affected many business sectors. One of these is the hotel industry. As a result of this economic crisis, it is necessary to act on the economic costs of running energy-intensive buildings such as a hotel. The thermal and electrical energy consumption of an accommodation facility weighs heavily on the economic balance. Governments around the globe have moved to help those activities in need. To improve the sustainability of the hospitality sector from an environmental and economic point of view, the introduction of energy retrofit solutions is mandatory. Following European sustainability laws, the impact and efficiency of the building were calculated using smart readiness indicators. The purpose of this paper is to present a case study of a 5-star hotel located in southern Italy characterized by high energy consumption. Precisely these consumptions are due to air conditioning, lighting, hot water, catering, and all other utilities. The entire building and the systems serving it were characterized by means of software that studies consumption with dynamic models, Trnsys. The same software made it possible to model the case study by replacing the existing air conditioning system with one supplied by renewable energies. Two energy retrofit hypotheses were chosen to obtain the best economic and environmental results. First, the choice was to install solar cooling powered by flat solar panels, and the second choice was solar cooling powered by evacuated tube collectors. This paper reports the technical and economic characteristics of both proposed solutions, quantifying the energy and economic savings to identify the best solution.

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Reducing cooling water consumption in a solar absorption chiller for Mali climates

Camara,

Sulin

2024

Energy Efficiency

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Performance assessment of a solar-assisted absorption-compression system for both heating and cooling

Cited by 11 publications

References 34 publications

Reducing Cooling Water Consumption in a Solar Absorption Chiller for Mali Climates

Reducing Cooling Water Consumption in a Solar Absorption Chiller for Mali Climates

Energy Analyses and Optimization Proposals for Hotels in Sicily: A Case Study

Reducing cooling water consumption in a solar absorption chiller for Mali climates

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