Developing figures for ‘gain’ in relation to refrigerated cabinets in a supermarket building

Abstract

Heat transfers into refrigerated cabinets from their surroundings. Currently, this heat transfer is ignored in building design compliance protocols (National Calculation Methodology), and a heat gain to the zone is included in modelling the retail floor, to represent the energy use of the refrigeration system, although this is normally outside of this zone. Previous work has established that a store designed for energy reduction with the heat transfers to refrigerated cabinets from the surroundings included in the modelling could have at least 20–35% lower energy demand (and CO₂ emissions) than a store modelled and ‘optimised’ on the National Calculation Methodology basis. This paper therefore offers an appropriate algorithm for ‘negative gains’ relating to refrigerated cabinet heat transfers for use in design and compliance modelling of supermarket buildings.

Practical application: The algorithm offered, when incorporated into design modelling, will enable significantly improved identification of the sensitivity of the thermal balance of the supermarket building to variation of building envelope parameters, and thereby enable significantly improved energy savings to be realised.

Keywords

Refrigeration building energy supermarket compliance

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References

HM Government UK. The building regulations: Conservation of fuel and power in new buildings other than dwellings, approved Document L2A, 2010. Available at: http://www.planningportal.gov.uk (accessed 24 October 2013).

BRE. National Calculation Methodology (NCM) modelling guide (for buildings other than dwellings in England and Wales), 2010. Available at: http://www.ncm.bre.co.uk (accessed 24 October 2013).

Watkins R, Tassou S and Datta D. Life cycle analysis of a commercial refrigerated display cabinet. In: 3rd International heat powered cycles conference, Larnaca, 2004.

Howell RH, Rosario L and Bula A. Effects of relative humidity on refrigerated display case performance. Florida: University of Tampa, http://www.inive.org/ members_area/medias/pdf/Inive/clima2000/1997/P275.pdf (1997, accessed 3 January 2012).

Kosar

Dumitrescu

. Humidity effects on supermarket refrigerated case energy performance: A database review. ASHRAE 2005; 111: 1–1.

Tassou

Hadawey

. Energy consumption and conservation in food retailing. Appl Therm Eng 2011; 31: 147–156.

Bahman

Rosario

Rahman

. Analysis of energy savings in a supermarket refrigeration/HVAC system. Appl Energy 2012; 98: 11–21.

Hill F and Edwards R. Influence of display cabinet cooling on performance of supermarket buildings. Build Serv Eng Res Technol 2013. Available at: http://www.cibse.org/content/cibsesymposium2013 (accessed 24 October 2013).

Hill F and Edwards R. Process energy in supermarket design compliance: Modelling stratification to interrogate the Gap. In: CIBSE technical symposium, Liverpool John Moores University, 2013.

10.

BRE. SBEM, Simplified Building Energy Model, 2012.