Evaluation on Expressions for Optimum Intermediate Condition of Two-Stage Vapor Compression Refrigeration Cycle

Himsar Ambarita

Abstract


Mathematical expressions for estimating the optimum intermediate condition of two-stage vapor compression refrigeration cycle have been investigated. The objective is to evaluate the expressions for optimum intermediate condition (pressure or temperature) for maximum COP. A set of governing equations on two-stage vapor compression refrigeration cycle are developed and solved numerically. The two-stage cycle is analyzed using commonly used refrigerants for air-conditioning use, they are R12, R22, and R134a. There are six expressions for optimum intermediate condition found in literature. These expressions are divided into two group, expression for optimum pressure and expression for optimum temperature. These expressions are evaluated using the developed model. The results show that deviation of the expressions for optimum pressure can be up to 18.38%. On the other hand, the maximum deviation for optimum temperature is only 6.74%. This fact suggests that expressions for optimum temperature are better than pressure one. However, the expressions found in literature only specific for a particular refrigerant. Those can’t be used for all refrigerants.

Keywords


Intermediate pressure; intermediate temperature; two-stage refrigeration cycle; Vapor compression cycle

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References


H. Ambarita, A. H. Nasution, N. M. Siahaan, and H. Kawai, “Performance of a clothes drying cabinet by utilizing waste heat from a split-type residential air conditioner,” Case Stud. Therm. Eng., vol. 8, pp. 105–114, Sep. 2016.

H. Ambarita, D. M. Nasution, S. Gunawan, and A. H. Nasution, “Performance and Characteristics of Heat Pump Clothes Drier,” in IOP Conference Series: Materials Science and Engineering, 2017, vol. 180, no. 1, p. 012027.

D. Bilge and G. Temir, “On the Optimum Numbers of Stages in Vapour Compression Refrigeration Systems,” Am. J. Appl. Sci., vol. 1, no. 2, pp. 71–75, 2004.

N. Purohit, D. K. Gupta, and M. S. Dasgupta, “Effect of Inter-stage Pressure on the Performance of a Two Stage Refrigeration Cycle Using Inter Cooler,” in Energy Procedia, 2016, vol. 90, pp. 171–178.

K. Chopra, V. Sahni, and R. S. Mishra, “Energy, Exergy and Sustainability Analysis of Two-stage Vapour Compression Refrigeration System,” J. Therm. Eng., vol. 1, no. 4, p. 440, Apr. 2015.

X. C. Xuan, “Optimum staging of multistage exo-reversible refrigeration systems,” Cryogenics (Guildf)., vol. 43, no. 2, pp. 117–124, Feb. 2003.

E. Torrella, R. Llopis, and R. Cabello, “Experimental evaluation of the inner-stage conditions of two-stage refrigeration cycle using a compound compressor,” Int. J. Refrig., vol. 32, pp. 307–315, 2009.

P. Röyttä, T. Turunen-Saaresti, and J. Honkatukia, “Optimising the refrigeration cycle with a two-stage centrifugal compressor and a flash intercooler,” Int. J. Refrig., vol. 32, no. 6, pp. 1366–1375, Sep. 2009.

R. Chandra Arora, Refrigeration and Air Conditioning. PHI Learning Pvt. Ltd., 2010.

B. T. B. Jekel, D. Ph, M. Ashrae, and D. T. Reindl, “Single- or Compression,” ASHRAE J., vol. 50, no. August, 2008.

X. Jin, S. Wang, T. (Tim) Zhang, and F. Zu, “Intermediate pressure of two-stage compression system under different conditions based on compressor coupling model,” Int. J. Refrig., vol. 35, no. 4, pp. 827–840, Jun. 2012.

P. A. Domanski, “Theoretical evaluation of the vapor compression cycle with a liquid-linesuction-line heat exchanger, economizer, and ejector,” Gaithersburg, MD, 1995.

S. . Zubair, M. Yaqub, and S. . Khan, “Second-law-based thermodynamic analysis of two-stage and mechanical-subcooling refrigeration cycles,” Int. J. Refrig., vol. 19, no. 8, pp. 506–516, Nov. 1996.

A. C. Cleland, “Computer subroutines for rapid evaluation of refrigerant thermodynamic properties,” Int. J. Refrig., vol. 9, no. 6, pp. 346–351, Nov. 1986.

J. S. Tiedeman and S. A. Sherif, “Optimum coefficient of performance and exergetic efficiency of a two-stage vapour compression refrigeration system,” J. Mech. Eng. Sci., vol. 217, no. 9, pp. 1027–1037, Sep. 2003.

S. Jiang, S. Wang, X. Jin, and T. Zhang, “A general model for two-stage vapor compression heat pump systems,” Int. J. Refrig., vol. 51, pp. 88–102, Mar. 2015.

G. Ma and X. Li, “Exergetic optimization of a key design parameter in heat pump systems with economizer coupled with scroll compressor,” Energy Convers. Manag., vol. 48, no. 4, pp. 1150–1159, Apr. 2007.

E. Navarro, A. Redón, J. Gonzálvez-Macia, I. O. Martinez-Galvan, and J. M. Corberán, “Characterization of a vapor injection scroll compressor as a function of low, intermediate and high pressures and temperature conditions,” Int. J. Refrig., vol. 36, no. 7, pp. 1821–1829, Nov. 2013.

S. Jiang, S. Wang, X. Jin, and Y. Yu, “The role of optimum intermediate pressure in the design of two-stage vapor compression systems: A further investigation,” Int. J. Refrig., vol. 70, pp. 57–70, Oct. 2016.

G. W.B., Principles of refrigeration. New York: Cambridge University Press, 1982.

G. Lepeleire, “Une nouvelle facon d’appreciation et de selection des compresseurs frigorifiques bietages,” in 13th International Congress of Refrigeration, 1973.

H. Behringer, “Berechnung des gunstigsten zwischendruckes bei verbundkompresion fur NH3-kaltemaschinen,” Zeitschrift fur die Gesamte Kalte-Industrie 35, vol. 35, pp. 111–113, 1928.

A. Rasi, “La pression intermediare la plus correcte pour les cycles frigorifiques a deux phases,” in Proceeding of the 9th International Congress of Refrigeration, 1955, pp. 3032–3039.

S. Czaplinski, “Uber den optimalen zwischendruck bei Kalteprozessen,” Allg. Warmetechnik, vol. 91, pp. 3–6, 1959.




DOI: http://dx.doi.org/10.12962/j20882033.v29i2.3188

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