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Modeling of S-RAM energy recover compressor integration in a transcritical carbon dioxide cycle for application in electronics cooling in varying gravity.

Number: pap. 2489

Author(s) : BARTA R. B., HUGENROTH J. J., GROLL E. A.

Summary

As electronics in military aircraft are increasing in complexity, additional cooling is necessary to enable efficient and high computing performance. In addition, the varying forces that a military aircraft endures during maneuvering and inverted flight introduce unique design constraints to the electronics cooling systems. Since the cooling system for such an application will be in an aircraft, the capacity and unique design constraints must all be met with a design that is lightweight, robust, oil-free, and resistant to varying gravity. This paper presents a study comparing the coefficient of performance (COP) of several cooling cycles utilizing both R134a and carbon dioxide (CO2) as the working fluids. Cycles with single-stage and two-stage compression with intercooling are compared, and both are modeled with suction-to-liquid-line internal heat exchangers (IHX). The cycles utilizing CO2 are transcritical to reach the required temperatures for heat rejection from the gas cooler. Additionally, CO2 cycles with expansion work recovery and an ejector are compared. The cooling requirements are up to 150 kW with a heat source temperature as low as 1.7 ? and a cooling airflow inlet temperature of 48.9 ? at an air mass flow rate of 9.1 kg/s. The purpose of this analysis is to understand which of these cycles performs with the highest efficiency for the given electronics cooling application and results in a higher air outlet temperature to potentially reduce the necessary temperature lift for a cascaded air cycle.

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Pages: 10

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Details

  • Original title: Modeling of S-RAM energy recover compressor integration in a transcritical carbon dioxide cycle for application in electronics cooling in varying gravity.
  • Record ID : 30024579
  • Languages: English
  • Source: 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2018/07/09

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