General method for the thermodynamic evaluation of heat pump working fluids

Angelino, G.; Invernizzi, Costante Mario

doi:10.1016/0140-7007(88)90007-2

Cited by 19 publications

(2 citation statements)

References 3 publications

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“…Vakil [l] provided a general discussion on the application of high-pressure/low-pressure side heat exchange in systems using pure refrigerants and mixtures. Angelino and lnvemizzi [2] theoretically evaluated various fluids for the heat pumping application. They defined the index of molecular complexity, primarily dependent on gas heat capacity, and pointed out that, for fluids having a high index value, cooling of the liquid line w a: The COP multiplier, (1 + t.q/q-t.w/w), has to be greater than one if the cycle COP is to benefit from the llsl heat exchange.…”

Section: Abstracrmentioning

confidence: 99%

Evaluation of suction-line/liquid-line heat exchange in the refrigeration cycle

Domanski

Didion

Doyle³

1994

International Journal of Refrigeration

128

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ABSTRAcrThe paper presents a theoretical evaluation of the performance effects resulting from the installation of a liquid line! suction line heat exchanger (llsl·hx). It examines cycle the parameters and refrigerant thermodynamic properties that determine whether the installation results in improvement of COP and volumetric capacity. The study showed that the benefit of application of the Jlsl-hx depends on a combination of operating conditions and fluid properties • heat capacity, latent heat, and coefficient of thermal CJtpansion • with heat capacity being the most influential property. Fluids that perform well in the basic cycle are marginally affected by the llsl-hx, and the impact on the Coefficient of Perfo~mance and volumetric capacity may be either positive or negative. Fluids performing poorly in the basic cycle benefit from the llsl·hx installation through increase of the Coefficient of Performance and volumetric capacity.

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Section: Abstracrmentioning

confidence: 99%

Evaluation of suction-line/liquid-line heat exchange in the refrigeration cycle

Domanski

Didion

Doyle³

1994

International Journal of Refrigeration

128

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“…This observation is in line with the heuristic screening criterion for refrigerant selection favoring refrigerants with greater critical temperatures T crit . [43][44][45] In contrast, no clear correlation is observed between the critical temperature T crit and the COP if the refrigerantdependent compressor model is used. For the given case study, the best-performing refrigerants even have comparably low critical temperatures T crit .…”

Section: Comparison With a Heuristic Refrigerant Selection Criterionmentioning

confidence: 99%

Refrigerant Selection for Heat Pumps: The Compressor Makes the Difference

et al. 2023

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Increasingly stringent regulations and new applications require selecting improved refrigerants for heat pumps. The selected refrigerants should be environmentally friendly and maximize the performance of the heat pump process. Systematic refrigerant selection methods usually model the compressor with one fixed isentropic efficiency identical for all refrigerants. However, compressor studies indicate that the isentropic efficiency may be highly refrigerant‐dependent. Herein, the need for a refrigerant‐dependent compressor model for refrigerant selection is investigated. For this purpose, a refrigerant‐dependent compressor model is combined with an integrated design of refrigerant and heat pump process. To guarantee a comparable nominal heating power among refrigerants, the compressor design is tailored to the refrigerant by expanding the refrigerant‐dependent compressor model toward compressor sizing. Integrating compressor design into systematic refrigerant selection is enabled by a computationally efficient model implementation. Accounting for refrigerant‐dependent compression substantially changes the resulting refrigerant ranking compared to the widely used assumption of identical isentropic efficiencies for all refrigerants: The best‐performing refrigerant is not even identified among the best ten refrigerants when assuming identical isentropic efficiencies. Consequently, compression is identified as the main driver for differences in refrigerant performance. Therefore, integrating refrigerant‐dependent compressor models is crucial for systematic refrigerant selection.

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