When most business people travel for their jobs, they retire to their hotel room at the end of the day. However, when long-haul truck drivers are finished with their work, they move to the back of their truck cab into what is called the sleeper compartment. Long-haul, over-the-road truck drivers
UK: Carrier AquaForce water-cooled screw chillers, with a combined cooling capacity of more than 1.4MW, are providing high efficiency cooling at Wiltshire County Council’s Trowbridge headquarters. The two Carrier high performance AquaForce 30XW-V variable speed R134a chillers selected employ inverter-driven twin-rotor screw compressors. These enable the chiller to achieve ESEERs
PROBLEM: High-rise buildings, built in 1960’s, were experiencing scaling, bio-film and dirt (rust) deposits in their condenser water systems. This inhibited heat transfer, lowering HVAC hydronic system efficiency. Previous traditional solutions (chemicals & flushing) failed to stop the cooling towers and chillers from scaling up. This required that they be
There have been reports that HVAC systems contribute to the spread of COVID-19. The recirculated air inside buildings means the virus can be spread around a building much further than it would under normal circumstances. There is therefore a correlation between COVID-19 Transmission and HVAC systems.
A VFD controls the frequency of the power supplying AC motors, such as those found in the compressors of chilled water cooling systems. It controls the speed of the motor, adjusting the input frequency and voltage. The motors on compressors are sized for the maximum capacity of the system. However, they need to run at only a fraction of this capacity for the majority of the time. The VFD will match the motor speed to the demands being placed on the system.