The MultiPlex Revolution
The most commonly used refrigeration system for supermarket’s today is the MultiPlex direct expansion system. All the in-store display cases and/or cold storage rooms use direct expansion air-refrigerant coils that are connected to the systems compressors which live in an external plantroom or on the roof of the store.
Energy Saving In The Plantroom
As we delve into the more technical aspects of refrigeration, we have found several plantroom components that can greatly improve the accuracy of your system in order to see greater overall energy efficiency.
Electronic Expansion Valves (EEV’s)
Electronic expansion valves are used in refrigeration systems to precisely control the flow of refrigerant into the systems evaporator. They are the evolution of the traditional thermal expansion valve and operate on a much more sophisticate design.
Electronic expansion valves in conjunction with their controllers can adapt far easier to varying temperatures. Reducing pressure in the condenser when the outside temperature allows while also increasing the evaporator pressure as needed.
Variable Speed Drives
Most refrigeration systems inherently operate at reduced capacity. This is due to the fact the refrigeration motors that drive the compressor pumps and fans are designed to operate at maximum load conditions on a fixed speed.
A system that adopts a variable speed drive runs at only the capacity needed, instead of the inherent maximum load. This simple enhancement can deliver a cost saving of up to 30 – 50% in reduced energy consumption.
Compressor Soft Starters
A soft starter is effectively the electronic clutch for your refrigeration systems motors and/or compressors. The gradual uptake of power puts less load on the system and allows you to safely attach more equipment to a single supply.
A soft starter ensures that any given motor will only consume the energy required when off-load and can also switch motors off automatically when they are not required. This not only protects motors from excess heat & vibration but also greatly reduces the number of unscheduled breakdowns.