Dedicated mechanical subcooling design strategies for supermarket applications

Thornton, J.; Klein, S.A.; Mitchell, J.W.

doi:10.1016/0140-7007(94)90026-4

Cited by 31 publications

(14 citation statements)

References 1 publication

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“…Thornton et al [1] found the most important factor is the subcooling temperature, by proposing an ideal tempera-ture dependent model, which shows the COP's behavior when the subcooling temperature varies between the evaporation and condensation temperature, then with a thermodynamic properties dependent model confirmed the good accuracy of the model. Khan and Zubair [2,3] developed a model which takes into account all the system's operational characteristics and irreversibility, showing the same behavior found by Thornton et al [1]. Also simplify the analysis by introducing the effectiveness concept to set the energy balances.…”

Section: Introductionmentioning

confidence: 87%

Design of a mechanical subcooling system device for increasing a low temperature refrigeration system’s capacity

Ibáñez

Ochoa

Chamorro³

2014

prospect

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The mechanical subcooling is employed to increase the coefficient of performance of any refrigeration cycle, especially in low temperature applications. When is necessary to retrofit a cycle, a dedicated mechanical subcooling system allows great flexibility to find one specific operating point such as a retrofitted system with a mayor capacity and better coefficientof performance (COP) or a retrofitted system with the same capacity and less run time required. Simulations run in Aspen HYSYS® usingthe proper fluid package lets study as many cases needed to get an optimum design for a retrofitted system, taking into account all the restrictions according each component in the main cycle RESUMEN El subenfriamiento mecánico se emplea para incrementar el coeficiente de desempeño de cualquier ciclo de refrigeración, especialmente en las aplicaciones de baja temperatura. Cuando es necesario reconfigurar un ciclo existente, un dispositivo de subenfriamiento mecánico permite una gran flexibilidad para encontrar un punto específico de operación, ya sea un sistema combinado con un mejor coeficiente de desempeño (COP) y una mayor capacidad de refrigeración o un sistema combinado de la misma capacidad que trabaja por menos tiempo y un mejor COP. Las simulaciones corridas en Aspen HYSYS® permiten estudiar tantos casos posibles como pueden presentarse para lograr un diseño óptimo en el sistema reconfigurado, teniendo en cuenta la restricciones que representan cada uno de los componentes existentes en el sistema principal.Palabras clave: Subenfriamiento mecánico, COP, temperatura de subenfriamiento, efectividad.

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Section: Introductionmentioning

confidence: 87%

Design of a mechanical subcooling system device for increasing a low temperature refrigeration system’s capacity

Ibáñez

Ochoa

Chamorro³

2014

prospect

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“…The COP and capacity of VCR cycles can be increased beyond what is possible through standard cycles by utilizing a dedicated sub-cooling control method (Thornton et al 1994). Jensen and Skogestad (2007) highlighted that if allowed by design, sub-cooling can be used to increase the performance of the VCR cycle.…”

Section: Sub-cooling Controlmentioning

confidence: 98%

Achieving a better energy-efficient automotive air-conditioning system: a review of potential technologies and strategies for vapor compression refrigeration cycle

et al. 2015

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This article presents a review of potential technologies and strategies to develop an energyefficient automotive air-conditioner based on the vapor-compression refrigeration cycle system. This paper is broadly divided into two sections. The first is a review of component optimization (primary and secondary components) that enhances the energy efficiency of the automotive air-conditioning (AAC) system. The second presents a review of operational management and control that efficiently consumes energy in operating the AAC system while maintaining vehicular thermal comfort satisfaction. Some of the technologies and strategies described in this article are still conceptual and are the subject of ongoing research. However, the growing demand to reduce energy consumption by developing a new AAC system has led to an increasing number of related studies aimed at generating alternative conventional systems in the near future. Keywords Automotive air-conditioning system . Efficient component . Energy efficiency improvement . Operational management Nomenclature A/C Air-conditioning AAC Automotive air-conditioning CRC Conventional refrigerant cycle DEAC Dual-evaporator air-conditioning DX Direct expansion EEV Electronic expansion valve EV Electric vehicle EVDC Externally controlled variable capacity compressor FCC Fixed capacity compressor FDC Fixed displacement compressor FSTPID Fuzzy self-tuning proportional integral derivative HVAC Heating, ventilation, and air conditioning MEC Modified ejector cycle RV Revolving vane SC Standard cycle SEC Standard ejector cycle TEV Thermostatic expansion valve TPERC Two-phase ejector refrigerant cycle VAV Variable air volume VCC Variable capacity compressor VCR Vapor compression refrigeration Energy Efficiency

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“…Thornton et al (1994) developed an ideal mechanical subcooling cycle from Carnot theory and heat transfer relations. In this study, the improvement in overall COP through the use of a subcooler was found to be approximately 10% over a range of conditions representing supermarket applications.…”

Section: Mechanical Subcoolermentioning

confidence: 99%