SUPERMARKETS
Overview Water Spray System Parallel Compressor Ejector Installation
May require new water lines
Economics
Increases water expenses
Requires extensive reconfi guring of system
High capital expense to retrofi t
Pressure Exchanger
Requires parallel compressor
High capital ex- pense to retrofi t
Only four tie-ins to an existing system
Pays back the investment due to energy savings
To meet this demand,
retailers and manufacturers are exploring ways to
expand cooling capacity without requiring a complete system replacement. One option is adding an evaporative or water spray system. However, this approach often requires extensive modifi cations, including new water lines. In regions where water costs are rising, this solution can also signifi cantly impact operating expenses. Another option – standard in new CO₂ system designs – is
integrating ejectors and parallel compression. However, these solutions are rarely used for retrofi ts due to their complexity and high implementation costs. A more accessible and cost-eff ective option has gained
prominence recently: integrating a pressure exchanger into existing CO₂ systems. Pressure exchangers recover and reintroduce energy,
allowing systems to operate more effi ciently and at higher capacities. These devices extract fl ash gas from the gas cooler during high ambient conditions, reducing compressor work and excessive pressure on the gas cooler and increasing the overall energy effi ciency.
Download the ACR News app today According to Energy Recovery, the PX G1300 pressure
exchanger can increase a CO₂ system’s gas cooler design temperature by up to 6°C and increase capacity by up to 15%. Installation of a retrofi t module is also straightforward, requiring only four tie-in points, and the small unit can be placed inside the machine room.
The impact of a retrofi t Incorporating a pressure exchanger into an existing system
provides immediate and lasting benefi ts. By increasing system capacity, supermarkets can safeguard against future heatwaves and expand cooling capabilities for additional refrigeration cases. Even in the absence of extreme heat, pressure exchangers improve overall system energy effi ciency.
For supermarkets seeking a reliable, cost-eff ective
retrofi t, pressure exchangers off er a solution that extends the lifespan of existing CO₂ systems while reducing energy and water costs.
expand their refrigeration capacity without replacing
entire systems.
www.acr-news.com • March 2025 21
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