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08-31-2004, 11:11 AM
Independent Analysis of a Walk-in Freezer with Regulated False Electrical Load for Analysis of XDX® Technology - Third Quarter 2001
(Excerpt Technical Paper Submitted to The International Institute of Refrigeration, The technical paper is available through that organization; for more details please click on the Contact Us link at the bottom of this page.)
Independent analysis of a walk-in freezer with regulated false electrical load for analysis of XDX® technology was conducted by a national original equipment manufacturer in Midwestern United States.
• Operating cycle time for the XDX® flow system was shorter than the TXV system.
• XDX® flow system pulled-down in 7.33 minutes
• TXV system pulled-down in 10.50 minutes
• 30.2% difference in on cycle time
• When the off-times of the cycles are factored in:
• XDX® flow system on-off cycle time was 11 minutes, 30 seconds
• TXV system on-off cycle time was 14 minutes
• 17.9% difference in total cycle time
• Converted hourly cycle times are:
• XDX® flow system on-off cycle time would be 38.24 minutes
• TXV system on-off cycle time would be 45 minutes
• 15.0% difference in hourly cycle time
• Compressor work, based on enthalpy difference, is almost the same in each case
• Therefore, the on-time difference per hour represents a power saving of 15%.
• Pull-down rate:
• XDX® flow system was 1.62°F/min
• TXV system was 1.14°F/min
• This represents 0.48°F/min or 29.6 percent improvement
• Suggests improved heat transfer rate using the XDX® flow system
• It is then interesting to examine the principles of heat transfer involved with this type of process to quantify heat transfer coefficient differences.
Key: Supermarkets, Food Service, Convenience Stores, Walk-in Freezers
(Excerpt Technical Paper Submitted to The International Institute of Refrigeration, The technical paper is available through that organization; for more details please click on the Contact Us link at the bottom of this page.)
Independent analysis of a walk-in freezer with regulated false electrical load for analysis of XDX® technology was conducted by a national original equipment manufacturer in Midwestern United States.
• Operating cycle time for the XDX® flow system was shorter than the TXV system.
• XDX® flow system pulled-down in 7.33 minutes
• TXV system pulled-down in 10.50 minutes
• 30.2% difference in on cycle time
• When the off-times of the cycles are factored in:
• XDX® flow system on-off cycle time was 11 minutes, 30 seconds
• TXV system on-off cycle time was 14 minutes
• 17.9% difference in total cycle time
• Converted hourly cycle times are:
• XDX® flow system on-off cycle time would be 38.24 minutes
• TXV system on-off cycle time would be 45 minutes
• 15.0% difference in hourly cycle time
• Compressor work, based on enthalpy difference, is almost the same in each case
• Therefore, the on-time difference per hour represents a power saving of 15%.
• Pull-down rate:
• XDX® flow system was 1.62°F/min
• TXV system was 1.14°F/min
• This represents 0.48°F/min or 29.6 percent improvement
• Suggests improved heat transfer rate using the XDX® flow system
• It is then interesting to examine the principles of heat transfer involved with this type of process to quantify heat transfer coefficient differences.
Key: Supermarkets, Food Service, Convenience Stores, Walk-in Freezers