Thermodynamic optimization of irreversible heat pumps

• Autorzy: Sarkar J. , Bhattacharyya S. , Ramgopal M.
• Języki publikacji: EN

Abstrakty

EN

The performance of an irreversible heat pump for simultaneous cooling and heating applications, for which irreversibilities results from both the finite size and finite rate of heat conduction, as well as compression and expansion, is studied. The relation between optimum system coefficient of performance and optimal rate of combined cooling and heating output has been established. Also relations for optimal cold and hot fluid temperatures have been derived and performance of irreversible heat pump has been discussed. The optimal correlations have been simplified for endoreversible cycle and compared with the relation for only cooling or hearting in the literature. Consequently, optimal relations for heat conductance inventory, residence time and mass distribution between the heat exchangers have been established.

Słowa kluczowe

EN

heat conductance inventory; irreversible heat pump; optimal relations; optimizations; system COP

PL

optymizacja; pompa ciepła; przewodnictwo ciepła; rezerwa; system COP; związki optymalne

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN ; Komitet Termodynamiki i Spalania PAN
• Czasopismo: Archives of Thermodynamics
• Rocznik: 2008
• Tom: Vol. 29, no. 3
• Strony: 59--68
• Opis fizyczny: Bibliogr. 14 poz.,rys., wykr., wz.,

Twórcy

autor

Sarkar J.

autor

Bhattacharyya S.

autor

Ramgopal M.

• Department of Mechanical Engineering, Institute of Technology, BHU, Varanasi 221005, India

Bibliografia

• [1] BEJAN A.: Entropy generation minimization: The new thermodynamics of finite-size devices and finite-time processes, J. of Applied Physics, 79(1996), 1191-1218.
• [2] CHEN L., WU C., SUN F.: Finite time thermodynamic optimization or entropy generation minimization of energy systems, J. of Non-Equilibrium Thermodynamics 24(1999), 327-359.
• [3] DURMAYAZ A., SOGUT O.S. SAHIN B., YAVUZ H.: Optimization of thermal system based on finite-time thermodynamics and thermoeconomics, Progress in Energy & Combustion Science 30(2004), 175-217.
• [4] LEFF H.F., TEETERS W.D.: EER, COP, and 2nd law efficiency for air-conditioners, American J. of Physics 46(197) 19-22.
• [5] BLANCHARD C.H.: Coefficient of performance for finite speed heat pump, J. of Applied Physics 51(1980), 2471-2472.
• [6] CHEN W.Z., SUN F.R., CHENG S.M., CHEN L.G.: Study on optimal performance and working temperatures of endoreversible forward and reverse Carnot cycles, Int. J. of Energy Research 19(1995), 751-9.
• [7] AGRAWAL D.C., MENON V.J.: Performance of a Carnot refrigerator at maximum cooling power, J. of Physics A: Mathematical & General 23(1990), 5319-5326.
• [8] WU C.: Performance of an endoreversible Carnot refrigerator, Energy Conversion & Management 37(1996), 1509-1512.
• [9] YAN Z., CHEN J.: A class irreversible Carnot refrigeration cycles with a general heat transfer law, J. of Physics D: Applied. Physics 23(1990), 136-141.
• [10] WU C., CHEN L., SUN F., CHEN W.: General performance characteristics of a finite-speed Carnot refrigerator, Applied Thermal. Engineering 16(1996), 299-303.
• [11] SUN F., CHEN W., CHN L., WU C.: Optimal performance of an endoreversible Carnot heat pump, Energy Conversion & Management 38(1997), 1439-1443.
• [12] WU C.: Maximum obtainable specific cooling load of a refrigerator, Energy Conversion & Management 36(1995), 7-10.
• [13] BEJAN A.: Entropy generation minimization, CRC Press, New York 1996.
• [14] KLEIN S.A., REINDL D.T.: The relationship of optimum heat exchanger allocation and minimum entropy generation rate refrigeration cycles, ASME Transactions 20(1998), 172-178.