Dynamic heat transfer modeling of a closed refrigerated display cabinet

Chaomuang, Nattawut; Laguerre, Onrawee; Flick, Denis

doi:10.1016/j.applthermaleng.2019.114138

Cited by 10 publications

(5 citation statements)

References 37 publications

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“…Replacing open-type refrigerated display cabinets with doored ones becomes an alternative and provides many advantages including improved food quality, achievement of energy savings, and reduced temperature fluctuations. The authors of [5][6][7] experimentally and numerically investigated closed refrigerated display cabinets under various conditions: with/without doors and at various external air temperatures. However, although the doored display cabinets exhibited higher energy efficiency, open display cabinets are always preferred by the buyers, as open-type cabinets attract them and make it easier for them to reach the food products [8].…”

Section: Introductionmentioning

confidence: 99%

2D CFD Simulation of Dynamic Heat Transfer in an Open-Type Refrigerated Display Cabinet

Vengalis

Mokšin

2022

Applied Sciences

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This study uses a simplified two-dimensional time-dependent computational fluid dynamic (CFD) model to study the influence of wall shelf configuration and outtake honeycomb inclination angle on the performance of the air curtain in an open-type semi-vertical refrigerated display cabinet. Numerical simulation results show that changing the angle, along with changing the shelf configuration, can reduce the temperature of the intake air grille and improve the warm/cold air ratio. The average temperature of the simulated food products decreased by 1.2 °C compared to the unmodified display cabinet and began to meet the requirements of the temperature category 3M0. The proposed CFD model was validated by the experimental results. The simulation results obtained are important for cabinet design to improve product storage quality and reduce energy consumption.

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Section: Introductionmentioning

confidence: 99%

2D CFD Simulation of Dynamic Heat Transfer in an Open-Type Refrigerated Display Cabinet

Vengalis

Mokšin

2022

Applied Sciences

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“…In the open showcase, the air curtain system can lower the cabinet's inside air temperature, as shown in Figure 1 [8,9]. 70% of the airflow supply that originates from the air curtains is used to maintain the temperature of the cabinet, while the remaining 30% airflow supply from the back-wall panel is used for cooling of the products.…”

Section: Introductionmentioning

confidence: 99%

Improving Energy Efficiency in Supermarkets by Retrofitting Low-E Glass Doors for Open Refrigeration Systems with Digital Semi Hermetic Compressor

Saengsikhiao

Taweekun

2021

ARFMTS

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This research will be presenting energy efficiency improvement options by retrofitting doors for open refrigeration systems in Central Thailand supermarkets that open during the daytime (06:00 am – 06:00 pm), and are closed during the night-time (00:00 am – 6:00 am). The materials and methods used consisted of 15 open refrigeration cabinets with 82 retrofitted doors supported by 41 frames, with the temperature set at medium. The power consumption was indicated in kW, kWh through a power meter data logger for analysis and summarization. The investment required was €21,694 /store, while the payback period of this research was determined to be at 14 months. The cost of energy savings was found to be within a period of 1.1 years, at the rate of 192,220 kWh/year or €18,503 annually. The retrofitted doors is expected to reduce the cooling load and over-burdening of the compressor. The research found that the most viable solution was to use a digital semi-hermetic compressor that can operate in unload and full load status, that was being controlled by the evaporator temperature (TEV) which was set at -10 degree, the condenser temperature (TCD) set at 38 degrees, and the superheat temperature (TSH) at 10 degrees. In the unload status, the power consumption of the digital semi hermetic compressor will decrease by 50%, which has a significant impact for energy savings and is important for night-time when low cooling load is required whereby the compressor’s multiple start–stop cycles are not required. The investment for a digital semi-hermetic compressor was determined to be €7,800/store, and is able to yield energy savings of up to 26,890 kWh/year, or €2,589 annually, with a payback period of 2.9 years.

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“…In addition to being able to maintain its temperature, a closed freezer can control the temperature of an open freezer, and can also help ensure that products do not exceed five degrees Celsius, which is where germs are formed [25,26]. The results of this research will contribute to sustainable energy reductions and the maintenance of quality products for customers [27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Energy Efficiency Improvement Solutions for Supermarkets by Low-E Glass Door and Digital Semi-Hermetic Compressor

Saengsikhiao

Taweekun

2021

Energies

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This research presents an energy efficiency improvement solution for supermarkets with the use of low-E glass doors for open refrigerators and a digital semi-hermetic compressor to fix the speed of semi-hermetic compressors. The impact of a door’s installation causes its load to be reduced by 40%, and the compressor shuts down frequently, which decreases its lifetime. In order to ensure that energy-saving solutions do not affect maintenance costs, the installation of a digital semi-hermetic compressor is proposed to lower costs and save energy. Our economic results from tests carried out at a 3000 square meter supermarket, which was open from 6:00 am to 12:00 am and in which we installed 82 doors on 15 open refrigerators, showed a 1.1-year payback period with an energy saving rate of 192,220 kWh/year for store No.1 (R22) and in which we installed 80 doors on 15 open refrigerators, showed a 1.4-year payback period with an energy saving rate of 171,185 kWh/year for store No.2 (R404A). The energy-saving effects of the digital semi-hermetic compressor, which fixes the speed of the semi-compressor and solves the problem of impact from fridge door installation, showed a 2.9-year payback period with an energy saving rate of 26,890 kWh/year for store No.1 (R22) and showed a 2.9-year payback period with an energy saving rate of 26,571 kWh/year for store No.2 (R404A). The results of store No.1 (R22) and store No.2 (R404A) showed no differences. This research is an extension of an energy-saving project that can be carried out on a continuous basis, increasing the efficiency of energy use and being a sustainable source of energy conservation.

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Dynamic heat transfer modeling of a closed refrigerated display cabinet

Cited by 10 publications

References 37 publications

2D CFD Simulation of Dynamic Heat Transfer in an Open-Type Refrigerated Display Cabinet

2D CFD Simulation of Dynamic Heat Transfer in an Open-Type Refrigerated Display Cabinet

Improving Energy Efficiency in Supermarkets by Retrofitting Low-E Glass Doors for Open Refrigeration Systems with Digital Semi Hermetic Compressor

Energy Efficiency Improvement Solutions for Supermarkets by Low-E Glass Door and Digital Semi-Hermetic Compressor

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