Refrigerants for R22 Retrofits – Refrigerant Replacement Guide

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Co2 Liquid Refrigerant Pump & LPA Economizer

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Refrigerants for R22 Retrofits – Refrigerant Replacement Guide

 Now that we are in the midst of the R22 phaseout, overtime the need to retrofit R22 systems is sure to rise. Exactly as to when that will happen remains the subject of debate and speculation, and will not be addressed here. However, for those who wish to be proactive, here are some retrofit pointers concerning increased liquid line mass flow rates as compared with R22.

Download the related refrigerant replacement guide article: Refrigerants-for-r22-replacements-retrofit Courtesy by Stephen Speltzer and Gus Rolloti of the Arkema Inc. North American Fluoro-chemicals business.

In addition to the related refrigerant replacement guide;

When choosing to invest in alternative blends, it is important to realise and prevent the likelihood of inheriting increased mass flow rates and associated liquid line pressure drop, the root cause of liquid line flashing and lower efficiency. See Effects of Flash Gas

Unless you choose to increase the liquid line pipe sizing to accommodate the increased mass flow of the chosen blend, pressure drop may have an adverse affect on system efficiency.

The table below demonstrates the severe effect liquid line velocity can have on liquid line pressure drop when comparing R22 with other various blends. Liquid line pressure drop is the root cause of liquid line flashing and poor system performance. Notice the sharp increase in liquid line pressure drop which is due to velocity². Should you be experiencing a negative effect on system performance and realizing higher energy power bills after a refrigerant conversion, this is likely to be due to an increase in liquid line flow rate and associated pressure drop. Contact us and we will be happy to provide you with a solution to dramatically improve and enhance your system efficiency.

By installing LPA® liquid delivery pumps you can expect to overcome these additional liquid line pressure drops and guarantee 100% liquid delivery to the expansion valves, both improving system capacity and reducing power consumption substantially.

Refrigerant Liquid Velocity Calculated Total Liquid Line Pressure Drop
R22 1m/s (3.3 f/s) 0.5 bar / 7.25 psi
R407a 1.26 m/s (4.16 f/s) 1.58 bar / 23.0 psi
R507 1.89 m/s (6.24 f/s) 3.57 bar / 51.8 psi

Based on 120F (48°C ) SCT 15F SST (-9°C) R22 0.38 GPM/Ton | R407a 0.48 GPM/Ton | R507 0.72 GPM/Ton |

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