An open reversed Brayton cycle with regeneration using moist air for deep freeze cooled by circulating water

Hou, Shaobo; Zhang, Hefei

doi:10.1016/j.ijthermalsci.2008.03.015

Cited by 22 publications

(2 citation statements)

References 31 publications

(30 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Bi et al, 2008Bi et al, , 2009Bi et al, , 2012Li et al, 2017). For freezing applications, an open rB cycle was studied by Hou and Zhang (2009), but cold air temperature was limited to -55 °C. Foster et al (2011) developed a first closed air cycle cooling and heating prototype able to reach working fluid temperature (air) even lower than -100 °C at the outlet of the turbine and at the same time recovering large quantities of heat at a temperature higher than 150 °C at the compression stage outlet.…”

Section: Introductionmentioning

confidence: 99%

Reversed Brayton cycle for food freezing at very low temperatures: Energy performance and optimisation

Biglia

Comba

Fabrizio

et al. 2017

International Journal of Refrigeration

View full text Add to dashboard Cite

Freezing is a valuable method to increase food shelf life and to ensure high quality standards during longterm storage. Additional benefits to frozen food quality can be achieved by freezing at very low temperatures (« -50 °C): small ice crystals formation during fast freezing reduces food cell wall rupture, preventing water and texture loss during thawing. This paper presents the design of an innovative food freezing system operating at very low temperatures, based on a modified reversed Brayton cycle (rB cycle). The plant is composed of two interconnected subsystems: a primary thermodynamic closed loop, operated by an rB cycle, and a secondary airflow loop which is devoted to food freezing by batch process. Relevant features of the designed rB cycle rely on the adopted environmentally safe working fluid, the optimised thermodynamics working conditions and the innovative cycle layout. A modelling framework for the system was developed to identify and design efficient operative settings for the plant components (turbo-machineries, heat exchangers, etc.) and to assess, via sensitivity analysis, the influence of the main design parameters on the global energy performance. The proposed system configuration, designed to maximise the Coefficient of Performance (CoP) value of the plant, was determined by means of nonlinear multivariable optimisation. In addition, the energy performance of the system can be increased by recovering waste heat available from the rB cycle.

show abstract

Section: Introductionmentioning

confidence: 99%

Reversed Brayton cycle for food freezing at very low temperatures: Energy performance and optimisation

Biglia

Comba

Fabrizio

et al. 2017

International Journal of Refrigeration

View full text Add to dashboard Cite

show abstract

“…An additional heat source may be required depending on the minimum temperature difference between two streams for heat exchange. Recently, a heat pump has been applied to thermal processes in which the ambient heat or the process waste heat is generally pumped up for heating the process stream by using working fluid compression. − Although the heat pump is well-known to reduce the energy consumption and exergy loss of the process, the heat load and capacity of the process stream are often different from those of the pumped heat. Thus, the normal heat pump is still possible to provide large exergy loss in the heat exchanger.…”

Section: Introductionmentioning

confidence: 99%

Self-Heat Recuperation Technology for Energy Saving in Chemical Processes

Kansha

Tsuru

Sato

et al. 2009

Ind. Eng. Chem. Res.

100

View full text Add to dashboard Cite

An innovative self-heat recuperation technology has been developed for heating and cooling thermal processes, in which not only latent heat but also sensible heat are circulated in a feed-effluent heat exchanger of the thermal process by compressing the effluent stream without any heat addition. Applying this technology to the thermal processes, the amount of energy required was determined using a commercial process simulation tool, PROII. The proposed self-heat recuperation technology, in which the heat of an effluent stream is recuperated and reused for feed stream heating by gas and/or vapor recompression, was found to drastically reduce the energy consumption.

show abstract