Thermodynamic Analysis of Irreversible Reversed Brayton Cycle Heat Pump with Finite Capacity Finite Conductance Heat Reservoirs

Mundhra, Raghav; Mukhopadhyay, Achintya

doi:10.1007/978-981-15-0124-1_69

Cited by 1 publication

(1 citation statement)

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“…A reversed Brayton cycle using air as the green working fluid is a potential alternative to conventional vapor compression systems of heating and drying [1][2][3]. Recent exploitation of the unification of expansion/compression into a single operation (compander) promotes the productization of air-reversed Brayton heat pump (air cycle heat pump) products [4,5].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Air-Reversed Brayton Heat Pump with Different Layouts of Turbochargers for Space Heating

Wang

Jiang

et al. 2022

Buildings

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The air-reversed Brayton cycle produces charming, environmentally friendly effects by using air as its refrigerant and has potential energy efficiency in applications related to space heating and building heating. However, there exist several types of cycle that need to be discussed. In this paper, six types of air-reversed Brayton heat pump with a turbocharger, applicable under different heating conditions, are developed. The expressions of the heating coefficient of performance (COP) and the corresponding turbine pressure ratio are derived based on thermodynamic analysis. By using these expressions, the effects of turbine pressure ratio on the COP under different working conditions are theoretically analyzed, and the optimal COPs of different cycles under specific working conditions are determined. It is observed that Cycles A and C have the highest heating COPs, and there is an optimal pressure ratio for each cycle. The corresponding pressure ratio of the optimal COP is different, concentrated in the range of 1.5–1.9. When the pressure ratio reaches the optimal value, increasing the pressure ratio does not significantly improve the heating COP. Take Cycle F as an example: the maximum error between the calculated results and experimental observation is lower than 5.6%. These results will enable further study of the air-reversed Brayton heat pump with a turbocharger from a different perspective.

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