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Recommissioning or set-points adjustment: The temperature and pressure set-points in the system drift with time for various reasons and adjusting them all back to manufacturer recommended values will help minimise energy consumption in the equipment. Adequate air flow over cooling and condensing coils: Inadequate air flow over the evaporator and condensing coils are another leading cause of poor energy performance of a system. Condensing and evaporator coil fouling and poor product loading in the display cases are two of the primary causes for this inadequate air flow. Poor airflow over evaporator coils can lead to icing and increase run time and power consumed. A refrigerant retrofit is a good opportunity to clean the coils and ensure that there are no barriers to free air flow over them as per manufacturer requirements. Adequate defrost cycles: Too few or too many defrost cycles will lead to higher energy consumption, furthermore, getting the defrost start- and end-times as well as the frequency to recommended levels is important for efficiency. Addition of doors and door heaters: Doors on refrigerated display cases can reduce the energy consumption by as much as 65% and adding anti-sweat heaters on doors will keep the doors functioning well, increase product visibility and reduce the need for frequent defrost – all leading to reduced energy consumption and improved efficiency. Important to note that the heaters will increase power consumed, but, this can be mitigated through smart controls that take into account both ambient conditions and usage factors. Conversion to LED lighting: This is another energy saving option that can be considered at the time of a refrigerant retrofit. Most existing display cases do not have low energy LED lighting and utilities and government agencies often offer incentives to retrofit the lighting as well. LEDs are more efficient and also put out less heat, thus making the refrigerated display case work better for maintaining the temperature. 4.5 References AHRI, 2013. Low GWP Alternative Refrigerant Evaluation Program http://www.ahrinet.org/site/514/Resources/Research/AHRI-Low-GWP-Alternative-Refrigerants- Evaluation AHRI, 2014. http://www.ahrinet.org/Resources/Research/AHRI-Low-GWP-Alternative- Refrigerants-Evaluation-Program/AHRI-Low-GWP-AREP-Conference AHRI 1250, 2014. AHRI Standard 1250 (I-P) 2014 Standard for Performance Rating of Walk-in Coolers and Freezers. http://www.ahrinet.org/App_Content/ahri/files/standards%20pdfs/AHRI%20standards%20pdfs/A HRI_1250_(I-P)-2014.pdf" ASHRAE, 2016. https://www.ashrae.org/about/news/2016/ashrae-ahri-doe-partner-to-fund- flammable-refrigerant-research Chasserot, 2013. Natural Refrigerants Market Trends; Bangkok ATMOsphere Technology Conference, June 30, 2013 Dallinger, J., Sheehan, J. 2012. Supermarktkälteanlage mit CO2 als Kälteträger – Fallstudie einer Anlage in Australien. DKV Tagung 2012, Würzburg, Germany EPA, 2010b. US-EPA: Transitioning to low-GWP alternatives in commercial refrigeration. Fact sheet, October 2010 EPA, 2014. http://www2.epa.gov/greenchill/reports-guidelines-and-tools 92 2018 TOC Refrigeration, A/C and Heat Pumps Assessment ReportPDF Image | Heat Pumps Technical Options
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