Derived thermodynamic design data for heat pump systems operating on R717

Adefila, S.S.; Devotta, S.; Watson, F.A.; Holland, F.A.

doi:10.1016/0198-7593(83)90094-2

Cited by 5 publications

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“…The cross-flow arrangement can work in minimum flow areas and practice is widely used over a parallel-flow arrangement. So a cross-configuration layout is chosen for the heat exchangers [20,21].…”

Section: Methodsmentioning

confidence: 99%

Investigation on the environmental impact of R32, R152a and R41 refrigerant blends

Karthik,

John Samuel,

Bhargav

et al. 2023

Eng. Res. Express

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The improper usage of refrigerants has a drastic impact on the environment, which is contributing to global warming and ozone layer depletion. The refrigerants which are being used currently have a very high GWP (Global Warming Potential) value that signifies an adverse impact on Global warming. Refrigerant properties can be enhanced and modified by making refrigerant blends. This research study uses GWP as a measure of refrigerant impact on global warming and provides alternative refrigerant blends for R32, R41, and R152a refrigerants. The results show 89.1% and 88.64% reduction in the GWP value of the R32 refrigerant blend and R152a refrigerant blend respectively. The R41 refrigerant blend has shown a reduction of 78.26%, with higher performance characteristics.

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Section: Methodsmentioning

confidence: 99%

Investigation on the environmental impact of R32, R152a and R41 refrigerant blends

Karthik,

John Samuel,

Bhargav

et al. 2023

Eng. Res. Express

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“…The performance of a heat pump is indicated by its coefficient of performance (COP). As the hypothetical Rankine heat pump cycle approximates ideal vapor compression heat pump,1–7 the coefficient of performance of Rankine heat pump (COPR) is useful for preliminary design of vapor compression heat pump system and its first law analysis as well as screening of working fluids for the system. As the working fluids' properties are the only considerations in determining the performance of ideal vapor compression heat pump, COPR is given only in terms of the internal thermodynamic properties (enthalpy, entropy, temperature, pressure, etc.)…”

Section: Introductionmentioning

confidence: 99%

Rankine heat pumps' performance equations as temperature-lift variables

Olawale

Adefila

2010

AIChE J.

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in Wiley Online Library (wileyonlinelibrary.com).Ideal heat pump performance models containing one adjustable parameter and intensive thermodynamic variables were developed by transformation of the energetic functions of Rankine heat pump. Two unknown groups in the formulated model, labeled AKR and AKF, were found to curve fit to two intensive variables as linear functions. The parameters of the linear fits were obtained using the least square method; consequently, AKR and AKF were expressed as temperature-lift variables. Maximum errors of about 5% were encountered at conditions below reduced temperature of 0.8. Better accuracy was obtained in the range of practical temperature lift (i.e., 10-80 C). Only one fit parameter value is required by these models where similar correlations require three or more. Furthermore, unlike some of the available models where different equations are required for each working fluid, these equations are not working fluid specific and do not require thermodynamic properties' tables or charts.

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“…Furthermore, the routines require very small number of data (two at the most) to use in computer-aided calculations or as a part of software package for COP calculations. The necessity thus arises to improve the predictive capability of the equations reported in earlier publication (Holland et al,1982;Adefila et al, 1987;Eisa et al, 1991;Jiang et al, 1982;Omideyi et al, 1983;Olawale and Adefila, 2011;Patwardhan and Patwardhan, 1987).…”

Section: Introductionmentioning

confidence: 99%

“…Ideal vapour compression heat pump cycle is also known as Rankine heat pump cycle (Reay, 1979;Srinivasan et al, 1983;Adefila et al, 1987;Eisa et al, 1991;Jiang et al, 1982;Omideyi et al, 1983). This is because the ideal heat pump is closely approximated by the hypothetical reversed Rankine energy cycle; so its performance is limited by the type of working fluid employed.…”

Section: Introductionmentioning

confidence: 99%

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Two-parameter Rankine Heat Pumps’ COP Equations

Olawale¹,

Adefila²

2012

Int. J. Thermo

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Rankine heat pump coefficient of performance (COPR) equations containing two fit-parameters are reported in this work. The equations can assess the performance of working fluids in vapour compression (Rankine) heat pump without detailed thermodynamic data. These equations contain either temperature term alone or temperature and pressure terms as the only thermodynamic variable(s). The best equation gave error ≤6% over wide range of temperature-lift for different working fluid types that include fluorocarbons, hydrocarbons and inorganic fluids. In these respects the equation performs better than the one-parameter models reported earlier.

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Derived thermodynamic design data for heat pump systems operating on R717

Cited by 5 publications

References 0 publications

Investigation on the environmental impact of R32, R152a and R41 refrigerant blends

Investigation on the environmental impact of R32, R152a and R41 refrigerant blends

Rankine heat pumps' performance equations as temperature-lift variables

Two-parameter Rankine Heat Pumps’ COP Equations

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