VCSI system varies the compressor speed to match the additional load with the potential capacity. When the needs of a room expand - more people in a conference room or auditorium, or an increase in equipment in a server room - so do the needs to maintain consistent temperature levels. By allocating potential capacity to meet the changing demands, VCSI system uses only the energy needed in any given situation.
VCSI system operates efficiently at partial load conditions. Once the desired temperature of the room is reached, the compressor slows down to maintain a constant temperature. By slightly adjusting compressor speed rather than shutting off and on again, energy consumption is kept at a minimum. This is because VCSI system is operating at partial load for maximum efficiency, thus no more excess energy use wasted for running maximum capacity unnecessary on a fixed speed system.
| VCSI systems | Conventional systems |
|---|---|
| VCSI compressor speeds up and slows down to maintain the conditioned space temperature. | Conventional compressor turns on and off to maintain the temperature. A compressor draws more amps at start-up than any other time. |
| Energy consumed by a VCSI compressor is directly related to the required amount of cooling or heating. (Capacity changes as needed.) | Conventional compressor consumes maximum amount of energy to produce maximum amount of cooling or heating at all times. (Capacity does not change.) |
| VCSI compressor helps system reach its set point quicker by running at a higher RPM for a shorter period of time, then ramps down to maintain temperature. | Conventional compressor runs at same RPM for longer period of time, then switches on and off to maintain temperature. |
| Indoor temperature swing is minimized with the VCSI system because the indoor coil activates longer. As temperature changes slightly, compressor speed also adjusts slightly to compensate. | Conventional system kicks back on at full speed to compensate for small changes in temperature. |
|
||||
|
