8:00 AM-9:00 AM
Conference Paper Session 1
Advances in Absorption Refrigeration
1 Modeling and Analysis of Bubble Pump Parameters for Vapor Absorption Refrigeration Systems (ST-16-C001)
2 Experimental Investigation on the Surface Tension of LiBr/H2O Solutions with Additives at Low Pressure (ST-16-C002)
1:30 PM-3:00 PM
Seminar 13
Advancements in Compressor Design, Testing and Performance Modeling for New Efficiency Standards and Alternative Refrigerants
1 Analysis of the Performance Rating Standards of Positive Displacement Refrigerant Compressors
2 Representation of a Positive Displacement Compressor Map with Vapor Injection
3 A Study of Methods to Represent Compressor Performance Data over an Operating Envelope Based on a Finite Set of Test Data
4 Sizing Low and High Compression Stages of Reciprocating Compressor for Optimum Vapor Injection Performance in Economized Cycle
1:30 PM-3:00 PM
Seminar 14
Ammonia and CO2: Advances in Application
1 The Transition to Natural Refrigerants
2 Low Charge Ammonia Case Studies
3 An Owner's Perspective: Electronic Refrigerant Injection Control (ERIC) Ammonia Applications
4 Transcritical CO2 in a Refrigerated Warehouse
8:00 AM-9:30 AM
Seminar 33
Innovation in a Commercial Refrigeration System with Natural Refrigerants and Low GWP Synthetic Refrigerants
1 Natural, Low-GWP Refrigerants for Light Commercial Refrigeration: Examples of Successfully Converted Applications Using R290, R600a and R744
2 Reducing GWP with a Low Charge Ammonia/CO2 Chiller
3 Decreasing Environmental Impact by Using Propane in Refrigerated Display Cases
4 Advanced Low-GWP Alternatives for Stand-Alone Refrigeration Systems
11:00 AM-12:30 PM
Seminar 43
Lubrication Effects Beyond the Compressor
1 Managing Lubricants in a Large Commercial Refrigeration System
2 Lubricant Management Heuristics and Impacts on System Chemistry, Valves and Other System Components
3 Lubricants in Heat Exchangers: A Slippery Slope
4 Oil Separator Efficiency Rating Dilemma
11:00 AM-12:30 PM
Seminar 45
Planes, Trailers and Ships: Advances in Transport Refrigeration System Technologies
4.00 Trucks,Trailers: Advances in Transport Refrigeration System Technologies
1.00 Ships: Advances in Transport Refrigeration System Technologies
2.00 Airplanes, Part 1: Advances in Transport Refrigeration System Technologies
3.00 Airplanes, Part 2: Advances in Aerospace Galley Refrigeration System Technologies
8:00 AM-9:30 AM
Seminar 55
System Efficiency Impacts of Low-GWP Refrigerants: Is This Our Fall from Grace?
1 The Thermodynamic Efficiency of Refrigerants: a History of a Downhill Slide?
2 A Total System Analysis of Air and Water Cooled Lower GWP Refrigerants
3 Low GWP (A2L) Refrigerant Evaluation on a 10-Ton Rooftop Air-Conditioner
4 Evaluation of a Lower GWP Refrigerant Option for R404A in Commercial Refrigeration Applications
11:00 AM-12:30 PM
Conference Paper Session 21
Experience with Alternative Refrigerants
1 Measured Performance of a High Temperature Heat Pump with HFO-1336mzz-Z as the Working Fluid (ST-16-C063)
2 Performance of a Four-Ton Rooftop Unit with Low GWP R410A Alternatives (ST-16-C064)
Measurements of performance at the AHRI Standard 210/240 rating points were made with each refrigerant. In addition, tests were run under outdoor temperatures ranging from 65F to 125F (18C to 52C). A simple thermodynamic cycle model that matches average saturation temperatures in the evaporator and condenser along with a common compressor isentropic efficiency indicates that the capacity with DR-55 should be 2.5% lower than with R410A and should have an efficiency 1% higher. Actual performance with DR-55 matched the capacity of R410A at the same compressor speed (60 Hz) with an efficiency 4% higher. Similarly positive results were obtained with DR-5A. With R32, the compressor speed needed to be reduced to 53 Hz to match the baseline capacity. Efficiency was 3% higher than baseline. As expected, R32 produced compressor discharge temperatures (CDTs) that were elevated by 20F and increased to 40F at the higher ambient conditions over R410A while DR-55 and DR-5A CDTs were only 10F above the baseline.
The results here demonstrate that DR-55 and DR-5A are "design compatible" alternatives to R410A. That is, they can be used in existing equipment designs with very little modification.