On-site real-time evaluation of an air-conditioning direct-fired double-effect absorption chiller

Torrella, E.; Sánchez, Daniel; Cabello, R.; Larumbe, J.A.

doi:10.1016/j.apenergy.2008.10.012

Cited by 23 publications

(3 citation statements)

References 11 publications

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“…The required energy is supplied by a heat source. Various heat sources can be used to activate the process as long as the temperature of the source is at least 80 • C. The heat from the direct combustion of natural gas [21], exhaust heat from a microturbine system which is also used to generate electricity [22], the heat from an internal combustion engine's jacket coolant loop [23] and the heat generated by operating a phosphoric acid fuel cell [24] have been reported to have been used for this purpose. In comparison to vapor-compression refrigeration systems, absorption refrigeration systems do not achieve high COP values and are limited to COP values of less than 1.5 in practice.…”

Section: Advances In Heat-activated Cooling Systemsmentioning

confidence: 99%

Advanced Active and Passive Methods in Residential Energy Efficiency

Taherian

Peters

2023

Energies

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Energy efficiency in buildings is very important since it contributes significantly to fossil fuel consumption and consequently climate change. Several approaches have been taken by researchers and the industry to address the issue. These approaches are classified as either passive or active approaches. The purpose of this review article is to summarize a number of the technologies that have been investigated and/or developed. In this technical review paper, the more commonly used active and passive building energy conservation techniques are described and discussed. The pros and cons of both the active and passive energy techniques are described with appropriate reference citations provided. This review article provides a description to give an understanding of building conservation approaches. In the active classification, several methods have been reviewed that include earth-to-air heat exchangers, ground-source and hybrid heat pumps, and the use of new refrigerants, among other methods. In the passive classification, methods such as vegetated roofs, solar chimneys, natural ventilation, and more are discussed. Often, in a building, multiple passive and active methods can be employed simultaneously.

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Section: Advances In Heat-activated Cooling Systemsmentioning

confidence: 99%

Advanced Active and Passive Methods in Residential Energy Efficiency

Taherian

Peters

2023

Energies

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“…An absorption chiller is also one of the heat recovery devices used to recover waste heat back to provide the cooling effect. In general, the thermal energy used to drive an absorption chiller may originate from many sources such as direct-fired burners [1,2], steam [3,4], flue gas [5,6] or hot water [7,8]. Because an absorption chiller is a heat-driven device, theoretically, the coefficient of performance (COP) of an absorption chiller is relatively low compared to that of a conventional electric one [9].…”

Section: Introductionmentioning

confidence: 99%

An Investigation on the Thermal Characteristics of a Single-Effect Absorption Chiller Subjected to the Input Steam Fluctuation

Vittayakaisin

Tangthieng

2014

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This paper presents an investigation on the thermal characteristics of a singleeffect absorption chiller subjected to the input steam fluctuation for an airconditioning purpose. The absorption chiller driven by waste steam is utilized with the total capacity of 270 tons. The analyzed data are obtained by the field measurement. The results indicate that most measuring parameters appear to be nearly constant with time whereas the chilled water outlet temperature and the cooling water outlet temperature appear to have a similar wave characteristic to the mass flow rate of the input steam. The regression analysis is performed in order to obtain the sine function of these three parameters. The lagging behavior of the cooling load and the rejected heat rate behind the input heat rate from waste steam is observed due to the thermal inertia of the absorption chiller. The energy analysis shows that the average cooling load, rejected heat rate and input heat rate from waste steam is 345.78 kW, 1033.80 kW, and 572.88 kW, respectively. The coefficient of performance of the absorption chiller has a high fluctuation from 0.296 to 1.524 with an average value of 0.754, resulted from the fluctuation of the mass flow rate of the input steam. The result indicates that the average value of the residual heat rate is 170.14 kW, which is approximately 10 percent of the total input heat.

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“…Many assessments of absorption cooling systems have been carried out using energy analysis 7–13. However, it is increasingly accepted that exergy analysis provides more meaningful information when assessing the performance of energy conversion systems, as it provides meaningful efficiencies and identifies the locations, magnitudes and sources of thermodynamic inefficiencies in these systems.…”

Section: Introductionmentioning

confidence: 99%

A comparative study of the performance characteristics of double-effect absorption refrigeration systems

Farshi¹,

Mahmoudi²,

Rosen³

et al. 2010

Int. J. Energy Res.

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Three classes of double-effect lithium bromide-water absorption refrigeration systems (series, parallel and reverse parallel) with identical refrigeration capacities are studied and compared thermodynamically. In order to simulate the performances of the systems, a new set of computationally efficient formulations is used for thermodynamic properties of Li-Br solutions at equilibrium. The simulation results are used to examine the influence of various operating parameters on the first and second law performance characteristics of the systems. In addition, the dependences are investigated of system performance on the effectivenesses of the solution heat exchangers, the pressure drops between the evaporator and the absorber and between the low-pressure generator and the condenser, and the low-grade heat externally supplied to the low-pressure generator. The results reveal the advantages and disadvantages of different configurations of double-effect lithium bromide-water absorption refrigeration systems, and are expected to be useful in the design and control of such systems.

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On-site real-time evaluation of an air-conditioning direct-fired double-effect absorption chiller

Cited by 23 publications

References 11 publications

Advanced Active and Passive Methods in Residential Energy Efficiency

Advanced Active and Passive Methods in Residential Energy Efficiency

An Investigation on the Thermal Characteristics of a Single-Effect Absorption Chiller Subjected to the Input Steam Fluctuation

A comparative study of the performance characteristics of double-effect absorption refrigeration systems

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