The majority of HVAC systems in large building are pretty much the same. They typically have thermal centrifugal chillers, absorption chillers or boilers with internal AHU, FCU and VAV used together with an additional cooling tower. Also, ice storage systems that use less expensive night hour electricity are implemented to complete the chiller systems by adding heat storage and ice storage systems. BMS systems are also implemented including building temperature and humidity control and monitoring, comfort control and energy control, but generally speaking, these large scale HVAC systems are very similar.
Small and medium sized central HVAC are based on a centralized controller known as AC Smart. This controller has a single screen and can access 5 inverter scroll chillers and 128 FCUs, and can also be connected to external devices (pumps, etc.) when needed. Also, an FCU remote control can operate an FCU and also operate inverter scroll chillers that are connected to the system. This allows the user to operate the chillers without having to go to each individual chiller and operate them from their control screen. Even without special training, an operator can use the AC smart screen to operate a chiller and monitor the system status, and FCU operations in multiple buildings can be monitored from a single screen.
BMS also has a diverse range of functions including systems restrictions, energy monitoring, operations reports, virtual group control and alarm notifications. If an operator wanted to calculate operation costs for each room in a building, they would simply need to add an energy meter to the inverter scroll chiller and use the FCU operations reports to calculate the costs separately.
Written by Jeongjin Choi, LG Electronics