2]-based refrigeration systems was compared to the baseline R-404A
multiplex DX system (System 1).
Complete Range of Parameters in the Data Showing Satisfactory Agreement with the Present Correlation Parameter Range Water, R-11, R-12, R-22, R-32, R-113, R-123, R-125, R-134a, R-142b, Fluids R-404A
, R-410A, R-502, R-507, isobutane, propylene, propane, benzene, ethanol, methanol, toluene, and dowtherm 209 Tube diameter, 2 to 49 mm Tube Horizontal, vertical downwards, 15[degrees] downward orientations Reduced 0.
R-410A and R-404A
are extensively used for heating, ventilation, air conditioning, and refrigeration (HVAC&R) applications.
high) Vehicle Insulation UA = 180 Btu/[degrees]F-h (new) with 5% degredation each year Route Description Daily Distribution, Weekdays, 14 hrs/day Temperature Control Annual Total: 200 days Lite Frozen (10[degrees]F set point); 50 days Frozen (-10[degrees]F set point) Door Openings 6 door openings each day, 30 minutes for each door opening Refrigerant R-404A
Fuel Diesel System Lifetime 15 years System Charge 13 lbs Table 2: Variable Parameters for the LCCP Case Study Case Number 1 2 3 4 Location Miami Denver Miami Denver Refrigerant Leakage Rate A A B = 2*A B = 2*A Case Number 1 2 Total Lifetime Emission [kg CO2-Eq.
The refrigerant circuit (Figure 2), whose working fluid is the refrigerant R-404A
, corresponds to a two-stage compression cycle with a liquid subcooling system.
In Part 2 (December 2016), we noted the large differences in mass flow between R-404A
We used equation 3 for mass flow metamodel and formulation 1 and 5 of Table 1 for the compressor power metamodel to predict the performance of the tested R-404A
medium temperature scroll compressor.
If <150 direct GWP for a refrigerant is used as the upper limit, one quickly realizes there are only a few candidates that can meet this limit for R-134a, R-404A
, R-410A and R-22 applications.
With this range customers can chose between R-134a and R-404A
refrigerants to suit the ambient temperatures the units will be operating in.
Thermo King's cryogenic refrigeration unit replaces the usual diesel engine, compressor and R-404A
refrigerant with carbon dioxide, an extremely efficient refrigerant.
Standard features include a stainless steel exterior, separate ice and water chutes and a quiet, air-cooled R-404A
Both the VK and VKL compressors can operate at speeds as high as 1,800 RPM and are available for R-717, R-22, R-404a
, as well as other refrigerants.