Capillary Tube Length and Refrigerant Charge
Refrigerant Capillary Tube Refrigerant Length, Charge (M), mm (in.) kg (lb) R-22 with mineral oil 508 (20) 1.418 (3.125) R-444B 356 (14) 1.568 (3.456) DR-3 178 (7) 2.007 (4.425) N20-B 152 (6) 2.087 (4.600) ARM-20b 178 (7) 1.588 (3.500) R-290 203 (8) 0.731 (1.613) DR-93 152 (6) 1.829 (4.031) R-22 with POE oil 508 (20) 1.766 (3.89) R-410A 673 (26.5) 0.936 (2.063) R-32 1016 (40) 0.709 (1.563) DR-55 660 (26) 0.811 (1.788) L41-2 864 (34) 0.780 (1.719) ARM-71A 610 (24) 0.765 (1.688) HPR-2A 965 (38) 0.808 (1.781) Capillary tube ID: 2 mm (0.079 in.) for R-22 and R-410A, and 1.65 mm (0.065 in.) for alternative refrigerants.
When setting out to develop the next generation of Azanechiller, we focused on meeting the demands of our customers for increased efficiency, lower refrigerant charge
and improved capital cost.
color touchscreen and PLC control with full system PID are standard, as are compact micro-channel condensers for minimized refrigerant charge
and increased durability, and 24 VDC control to keep the control circuit free from AC interference.
You'll find a checklist there of things that you might not need to be instructed in so much as reminded of, including the importance of checking the refrigerant charge
, which can affect performance by 5-10%.
For a long time, subjects dealing with the refrigerant charge
in equipment were not a priority.
Extensive testing was performed within the laboratory to track the location of two-phase sections within the evaporator for a range of operating conditions and levels of refrigerant charge
. Li and Braun (2007d) plotted the refrigerant temperature distribution in the evaporator for all the testing data to visualize the refrigerant phase distribution in the evaporator.
But these will typically not detect a problem until the system has lost its refrigerant charge
, which puts the compressor at risk for failure, the company said.
Using an HFC refrigerant (R404A), the system "significantly reduces the amount of liquid and suction line piping, the number of braze joints, and the required refrigerant charge
," he said.
This retrofit procedure requires chiller shutdown and removal of the entire refrigerant charge
. This is not an issue with open-motor chillers because the refrigerant never comes in contact with any part of the motor.
The European Partnership for Energy and the Environment presented its "Gapometer," a tool showing three steps to achieving HFC phasedown in Europe: Step one: Employ new equipment with lower GWP alternatives (move away from R-404A and wider use of flammable refrigerants) and smart design that allows less refrigerant charge
and low leakage; Step Two: Retrofit existing equipment with lower GWP alternatives (early retrofit of R-404A) and employ leak prevention; Step Three: address reclaimed refrigerant recovered during retrofit of existing equipment.
Designed to notably reduce total refrigerant charge
by up to 80 percent, the system features small, self-contained refrigeration circuits with hermetically sealed piping that also minimize the chance for refrigerant leaks.