A simplified heat transfer model of a closed refrigerated display cabinet

Chaomuang, Nattawut; Laguerre, Onrawee; Flick, Denis

doi:10.1016/j.tsep.2020.100494

Cited by 13 publications

(7 citation statements)

References 31 publications

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“…Sun et al [3] investigated the impact of flow guiding strips on the flow of the air curtain, the temperature of the products and (most importantly) on the energy consumption of the cabinet. Chaomuang et al [4] developed a simplified heat transfer model of a closed display cabinet based on the zonal approach. This model enables the identification of the critical zones, i. e., too warm and too cold, which can lead to food quality deterioration and chilling injury, respectively.…”

Section: Introductionmentioning

confidence: 99%

CFD simulation of heat transfer and airflows in an open refrigerated display cabinet

Vengalis

Mokšin

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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This paper uses CFD (Computational Fluid Dynamics) method to study the efficiency of the airflow curtain in an empty and full open refrigerated display cabinet. Numerical simulation results show that changing of the angle of the honeycomb can reduce the infiltration of warm ambient air into the refrigerator. It was established that the average intake air temperature in modified design decreased by 0.6 °C compared to the original design. The CFD model presented in the paper can be used to study airflows inside and to design and develop open-type refrigerated cabinets.

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Section: Introductionmentioning

confidence: 99%

CFD simulation of heat transfer and airflows in an open refrigerated display cabinet

Vengalis

Mokšin

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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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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“…The model is then used to predict the effect of air infiltration through the door gap on the performance of closed display cabinets in both thermal and energy aspects. Applications in supermarkets were also observed that door opening is the main energy loss in display cabinets and in supermarkets a lot of waste is needed because many display cabinets are open [13,14,15]. In addition, Manson et al [16] conducted an experimental study on the effects of operating conditions, including door opening frequency, ambient air temperature and product occupied volume, on the distribution of air and product temperatures in closed refrigerated display cabinets and obtained that this kind of operation cause significant energy loss.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Display Cabinet Design with Commissioning Test for Fresh Sea Food

Santosa¹,

Waisnawa²,

Wirajati³

et al. 2021

LOGIC

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This research is a design of a display cabinet cooling system with integrated energy from PLN electricity and solar power. This equipment is used for displaying marine fish and other fresh sea food in restaurants or cafes in support of Balinese culinary specialties, namely grilled fish and seafood which are very well known and can be a very extraordinary carrying capacity for Bali tourism. This cooling system is designed to be able to maintain the temperature of the cooling room (cabin) up to -5 oC. This is in accordance with the standards for storing fresh sea fish and sea food in a temperature range of -2oC to 2oC, where fish and sea food are still in a very fresh condition for an average of 1 week. Other standards to maintain product freshness also require room humidity between RH 90% – RH 95%. Furthermore, data collection on system performance is carried out using the commissioning test method to determine the initial performance achievement of the tool so that its shortcomings can be evaluated which will be developed and corrected in further research. From the research, it is found that the temperature achievement is very good, the solar and PLN integration system with the Automatic Transfer Switch (ATS) control system has also worked well where the switch occurs when the battery charging condition is below 30% or below 10V. However, something that has not been achieved is the humidity in this system, the average relative humidity (RH) is 50% so that the final condition of the product becomes dry on the surface of the fish. This relatively low humidity is due to the fact that it still relies on the humidity increase system by opening the cooler cabin door. In the next development, the right humidifier system will be designed for this display cabinet system.

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A simplified heat transfer model of a closed refrigerated display cabinet

Cited by 13 publications

References 31 publications

CFD simulation of heat transfer and airflows in an open refrigerated display cabinet

CFD simulation of heat transfer and airflows in an open refrigerated display cabinet

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

Analysis of Display Cabinet Design with Commissioning Test for Fresh Sea Food

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