Appliance Design - May 2008 - (Page 34)

QUALITY & STANDARDS Fig. 3. Ambient temperatures of Atlanta versus EER rating-point conditions. Fig. 4. Ambient temperatures of Minneapolis versus EER rating-point conditions. sonality, it is an effective way to compare air-conditioning equipment and is a trusted standard for air-conditioning applications. However, there is a need in the refrigeration industry for a method that takes the EER and SEER concepts one step further. Cost-Effective Control for OEM Applications A new method The AEER measure takes the EER and SEER concepts and expands upon them. By using varying condensing temperatures tied to the actual weather data in a particular location, AEER offers the most precise indication of capacity demand and energy usage for engineers and other professionals in the refrigeration industry. AEER is a weighted average efficiency for a system that utilizes a concept similar to that of bin analysis. Bin analysis examines the performance of a refrigeration system in a specific geographical location, and is calculated by using the annual temperature profile of a geographical location to vary the condensing temperature of the system. With that, annual power consumption and average efficiency are calculated to provide an estimate on the system performance. Although bin analysis is never exactly the same as the real performance of the system, it is extremely useful in comparing different system and compressor options to select the optimum design. AEER uses this bin analysis concept to create a weighted energy efficiency ratio that represents the entire year in a specific location. AEER is determined by taking the percentage of time spent at each condensing temperature and multiplying it by a weighted energy efficiency ratio. Then the results are summed to give an annual EER number for a compressor at a certain location with specific evaporating and return-gas temperatures. (Table 2 shows the AEER calculation for a ZB45KCE, a medium-temperature scroll compressor running R-404A in Phoenix, Ariz.) Because AEER is based on the bin hours of different ambient temperatures, it brings an additional component to the table. It uses the bin analysis concept to more precisely take seasonality into account for a fixed-load refrigeration system in a specific location. See us in Boston at NEPCON East, Assembly New England and OEM New England booth 557 See us in New York at Atlantic Design booth 173 Benefits The AEER method of measurement offers great benefits to refrigeration system design Athena Controls, Inc. For more information contact For more Information Enter 107 34 applianceDESIGN AD02082Athena.indd 1 May 2008 1/8/08 11:13:53 AM www.applianceDESIGN.com http://www.appliancedesign.com

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Appliance Design - May 2008 Contents Editorial Shipments/Forecasts News Watch New and Notable Displays & Indicators Elastomers Quality & Standards Indoor Air Quality IHHS Highlights New Products Classifieds Design Marts Advertiser’s Index Association Report: PSMA

Appliance Design - May 2008

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