New hybrid absorption–compression refrigeration system based on cascade use of mid-temperature waste heat

Han, Wei; Sun, Liuli; Zheng, Danxing; Jin, Hongguang; Ma, Sijun; Jing, Xuye

doi:10.1016/j.apenergy.2013.01.067

Cited by 89 publications

(15 citation statements)

References 22 publications

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“…The low grade energy also includes renewable energy such as solar energy, geothermal energy, etc. Conventionally, low grade energy can drive refrigeration or heat pump systems [3,4]. Alternatively, organic Rankine cycles (ORCs) convert low grade thermal energy to power or electricity.…”

Section: Introductionmentioning

confidence: 99%

Condensation heat transfer of R245fa in tubes with and without lyophilic porous-membrane-tube insert

Xie

Cheng

et al. 2015

International Journal of Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 99%

Condensation heat transfer of R245fa in tubes with and without lyophilic porous-membrane-tube insert

Xie

Cheng

et al. 2015

International Journal of Heat and Mass Transfer

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“…In single stage refrigeration systems using CO 2 as a refrigerant, a 41 high pressure ratio and condensation close to the critical conditions lead to a low coefficient 42 of performance (COP) in comparison with the refrigeration cycles working with HFC 43 refrigerants [1]. 44 Two-stage compression systems and cascade refrigeration cycles can be used for these 45 applications to overcome the aforementioned problem [2][3][4][5][6][7]. A cascade refrigeration cycle 46 involves two refrigeration circuits which are thermally coupled through an internal cascade 47 heat exchanger.…”

Section: Introduction 33mentioning

confidence: 99%

Exergoeconomic and environmental analyses of CO2/NH3 cascade refrigeration systems equipped with different types of flash tank intercoolers

Mosaffa

Farshi

Ferreira

et al. 2016

Energy Conversion and Management

211

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Research Highlights• CO 2 /NH 3 cascade refrigeration cycles with flash intercoolers are investigated.• Exergoeconomic factors of components are determined to assess their relative significances.• An environmental analysis is applied to determine the penalty cost of GHG emission.• The effects of operating parameters on COP, exergy efficiency and total cost rate are investigated.• An optimization is applied based on the maximum COP and the minimum total cost rate. 1© 2016 This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ Abstract: 11Exergoeconomic and environmental analyses are presented for two CO 2 /NH 3 cascade 12 refrigeration systems equipped with 1) two flash tanks, and 2) a flash tank along with a flash 13 intercooler with indirect subcooler. A comparative study is performed for the proposed 14 systems, and optimal values of operating parameters of the system are determined that 15 maximize the coefficient of performance (COP) and exergy efficiency and minimize the total 16 annual cost. The operating parameters considered include condensing temperatures of NH 3 in 17 the condenser and CO 2 in the cascade heat exchanger, the evaporating temperature of CO 2 in 18 the evaporator, the temperature difference in the cascade heat exchanger, the intermediate 19 pressure of the flash tank in the CO 2 low-temperature circuit, the mass flow rate ratio in the 20 flash intercooler and the degree of superheating of the CO 2 at the evaporator outlet. The total 21 annual cost includes the capital, operating and maintenance costs and the penalty cost of 22 GHG emission. The results show that, the total annual cost rate for system 1 is 11.2% and 23 2 11.9% lower than that for system 2 referring to thermodynamic and economic optimizations, 24 respectively. For thermodynamic and cost optimal design condition the COP and exergy 25 efficiency of both systems are almost the same. Finally, in order to obtain the best balance 26 between exergy destruction cost and capital cost, the exergoeconomic factor is defined for 27 each component of proposed systems, for cases in which the system operates at the best 28 performance conditions. 29 Keywords

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“…The waste heat driven refrigeration or heat pump systems are effective ways to recover the low grade heat [2,3].…”

Section: Introductionmentioning

confidence: 99%

Significant heat transfer enhancement for R123 condensation by micromembrane cylinder

Xie

Xing

et al. 2014

Chin. Sci. Bull.

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Renewable energy or low grade energy utilizations need high performance of phase change heat exchangers. Suspending micromembrane cylinder in tube (called modulated heat transfer tube) increases the void fractions or vapor qualities near the tube wall to significantly enhance heat transfer. The R123 condensation heat transfer with horizontal position was investigated. The results for the bare tube and modulated heat transfer tube were tested case by case. It is found that the modulated heat transfer tube significantly enhance the condensation heat transfer, with the heat transfer enhancement factors (EF) covering the range of 1.118-2.124. The comprehensive performance evaluation criteria (PEC) had the range of 0.71-1.66, with most of runs behaving PEC larger than 1.0. For the two-phase outlet conditions, the EF values are increased with increases in the vapor mass fluxes, Gx in , where G is the mass flux and x in is the inlet vapor mass quality. The EF values are inversely related to Gx in for the subcooled liquid outlet cases. The enhanced heat transfer mechanisms are analyzed with the observed images together with the discussion of pressure and velocity distributions.

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New hybrid absorption–compression refrigeration system based on cascade use of mid-temperature waste heat

Cited by 89 publications

References 22 publications

Condensation heat transfer of R245fa in tubes with and without lyophilic porous-membrane-tube insert

Condensation heat transfer of R245fa in tubes with and without lyophilic porous-membrane-tube insert

Exergoeconomic and environmental analyses of CO2/NH3 cascade refrigeration systems equipped with different types of flash tank intercoolers

Significant heat transfer enhancement for R123 condensation by micromembrane cylinder

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