Thermodynamic analysis of the absorption refrigeration system with geothermal energy: an experimental study

Keçeciler, Abdullah; Acar, Halil İbrahim; Doğan, Ayla

doi:10.1016/s0196-8904(99)00091-6

Cited by 72 publications

(33 citation statements)

References 2 publications

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“…In all cases the generator outlet temperature was used. It can be seen that the average COP values produced by this experimental work is significantly higher than those produced by both Kececiler et al [24] and Florides et al [16]. Table 2 This indicates that the rate of refrigerant generation increases with increasing the pressure difference thus increasing the cooling load and COP.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 52%

“…However, for the absorber, the system COP increases with decreasing the absorber temperature. A COP up to 1 was found, which was greater than the lithium bromide systems illustrated by Keçeciler et al [24] and Florides et al [16] at higher generator temperatures.…”

Section: Discussionmentioning

confidence: 64%

“…It can be observed that the system COP increases as the generator temperature increases. Table 2 presents the average value of COP and the corresponding operating conditions in comparison of LiBr/Water absorption chillers of Keçeciler et al [24] and Florides et al [16]. Keçeciler et al [24] used geothermal energy as the heat source to operate a M A N U S C R I P T…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…[7,24] Water Monomethylamine [26] T c Decreases as T c increases Fixed T e , T a , T g Water Lithium bromide [7,24] Water Monomethylamine [26] T a Decreases as T a increases Fixed T e , T c , T g…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…Water Lithium bromide [7,27] Water Monomethylamine [26] Water Lithium iodide [27] T g Increases as T g increases Fixed T e , T c , T a Water Lithium bromide [7,24,28] Water Lithium iodide [27] M A N U S C R I P T The COP and generator heat input versus the circulation ratio Table 1 The effect of operating conditions on absorption system performance Table 2 Experimental COP in comparison with published data…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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Solar powered vapor absorption system using propane and alkylated benzene AB300 oil

Al-Dadah

Jackson²,

Rezk

2011

Applied Thermal Engineering

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This paper describes experimental work on a solar assisted vapour absorption air conditioning system using Propane (refrigerant) and Alkylated Benzene (AB300-refrigeration lubrication oil, absorbent). Preliminary experiments to assess the miscibility of propane in various lubricating oils namely Shell Clavus oils 32 and 64 and Alkylated Benzene oils AB150 and AB300 indicated that Propane is most miscible in Alkylated Benzene AB300. The vapour absorption system is a single stage absorption consisting of evaporator, absorber, generator and condenser. The system is equipped with heat pipes installed between the absorber and the pre-generator to recover the heat of absorption. The heat applied to the generator replicated the solar thermal energy based on the climatic conditions of Jamaica using flat plate collectors commonly used in Jamaica. Experiments at various evaporator, absorber and generator temperatures showed that the coefficient of performance of the system increases with increasing the generator temperature and with decreasing the absorber temperatures. The solar fraction for the flat plate collectors to produce the generator temperature needed to drive the absorption system is up to 50%.

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Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 52%

Section: Discussionmentioning

confidence: 64%

Section: Accepted Manuscriptmentioning

confidence: 99%

Section: Accepted Manuscriptmentioning

confidence: 99%

Section: Accepted Manuscriptmentioning

confidence: 99%

See 3 more Smart Citations

Solar powered vapor absorption system using propane and alkylated benzene AB300 oil

Al-Dadah

Jackson²,

Rezk

2011

Applied Thermal Engineering

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Novel integrated helium extraction and natural gas liquefaction process configurations using absorption refrigeration and waste heat

et al. 2020

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Summary Conceptual design and modeling of novel‐integrated process configurations for helium extraction and natural gas liquefaction is investigated. Mixed fluid cascade (MFC) refrigeration system is considered for providing the needed refrigeration in the natural liquefaction section. Using an absorption refrigeration system as the precooling cycle is investigated in one of the introduced processes. Integrated flash and distillation method is used for helium extraction. Purity of the extracted crude helium is 50% (mole). Process streams operational condition and specifications of the devices are presented and explained. Composite curves of the heat exchangers demonstrate that thermal design has been done properly. Ratio of the power consumption to the produced liquefied natural gas (LNG) of the MFC process is 0.265 kWh per kg LNG and applying absorption refrigeration system instead of the pre‐cooling cycle decreases it to 0.1849 kWh per kg LNG. For the modified process with absorption refrigeration system helium extraction rate and power consumption ratio are 0.951 and 132.9 (kWh/[kgmole Helium]) respectively. Exergy method is applied on the under consideration processes. The results show that the compressors have the highest rate of exergy destruction among the other process equipment. An extensive economic analysis is done on the proposed processes. The results show that prime cost of the product (US$/kg LNG) for MFC and modified MFC processes are 0.1939 and 0.2069, respectively. Finally, a sensitivity analysis is done based on the economic factors such as electrical energy price and prime cost of the product.

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Space cooling using geothermal single‐effect water/lithium bromide absorption chiller

Assad

Sadeghzadeh

Ahmadi

et al. 2021

Energy Science & Engineering

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This research is proposed to fully investigate the performance of a single‐effect water/lithium bromide absorption chiller driven by geothermal energy. Since absorption cycles are considered as low‐grade energy cycles, this innovative idea of rejecting fluid from a single‐flash geothermal power plant with low‐grade energy would serve as efficient, economical, and promising technology. In order to examine the feasibility of this approach, a residential building which is located in Sharjah, UAE, considered to evaluate its cooling capacity of 39 kW which is calculated using MATLAB software. Based on the obtained cooling load, modeling of the required water/lithium bromide single‐effect absorption chiller machine is implemented and discussed. A detailed performance analysis of the proposed model under different conditions is performed using Engineering Equation Solver software (EES). Based on the obtained results, the major factors in the design of the proposed system are the size of the heat exchangers and the input heat source temperature. The results are presented graphically to find out the geofluid temperature and mass flow and solution heat exchanger effectiveness effects on the chiller thermal performance. Moreover, the effects of the size of all components of the absorption chiller on the cooling load to meet the space heating are presented. The thermal efficiency of the single‐flash geothermal power plant is about 13% when the power plant is at production well temperature 250℃, separator pressure 0.24 MPa, and condenser pressure 7.5 kPa. The results show that the coefficient of performance (COP) reaches about 0.87 at solution heat exchanger effectiveness of 0.9, when the geofluid temperature is 120℃.

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Thermodynamic analysis of the absorption refrigeration system with geothermal energy: an experimental study

Cited by 72 publications

References 2 publications

Solar powered vapor absorption system using propane and alkylated benzene AB300 oil

Solar powered vapor absorption system using propane and alkylated benzene AB300 oil

Novel integrated helium extraction and natural gas liquefaction process configurations using absorption refrigeration and waste heat

Space cooling using geothermal single‐effect water/lithium bromide absorption chiller

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