by Andre Patenaude | May 3, 2016 | Efficiency & Refrigerant Regulations, Refrigerants
This is post number 13 of a series. Selecting the Best System – Booster Versus Cascade Versus Secondary Table 1 lists the advantages and disadvantages of cascade, transcritical, and secondary retail systems Conclusion Transcritical operation is...
by Andre Patenaude | Apr 7, 2016 | Efficiency & Refrigerant Regulations, Refrigerants
This is post number 12 of a series. Secondary Systems Figure 6 shows a simple secondary system. The high-stage system cools the liquid R744 in the secondary circuit. The R744 is pumped around the load. It is volatile, so unlike a conventional secondary fluid such as...
by Andre Patenaude | Mar 24, 2016 | Efficiency & Refrigerant Regulations, Refrigerants
This is post number 11 of a series. Retail Cascade Systems The cascade system comprises: The low stage, which provides cooling for the load. It uses R744 and is always subcritical The high stage, which absorbs heat from the condensing R744 at the cascade heat...
by Andre Patenaude | Mar 10, 2016 | Efficiency & Refrigerant Regulations, Refrigerants
This is post number ten of a series. Retail Booster Systems Two-stage compression is used for transcritical low temperature applications because the discharge temperature of R744 is high and will potentially result in lubricant breakdown. Figure below shows a simple...
by Andre Patenaude | Feb 25, 2016 | Efficiency & Refrigerant Regulations, Refrigerants
This is post number nine of a series. Introduction to Retail Transcritical Systems The diagram in Figure 1 is a simple single-stage transcritical system. The refrigerant discharged from the compressor flows into the gas cooler where heat is removed. If ambient is low...
