Approximately half of the electricity in commercial buildings is used to move air and water around. Motor driven components used in HVAC are the highest energy consumer in the commercial sector. Using variable speed drives (房间隔缺损) within HVAC systems saves energy and money.


Most HVAC systems are designed to operate fans and pumps at a constant speed for peak load. This means the HVAC system is typically oversized during the majority of operating hours for most applications. 房间隔缺损, also referred to as variable frequency drives (VFDs), are capable of varying the output speed of a motor to meet the demand of the system. 房间隔缺损 match the amount of work or load on a motor to the amount of energy that is required, 减少能源使用. 房间隔缺损 also have built-in soft start capability, which extends the life of the motor.


激励 are available for new equipment installations through hg8868皇冠下载’s Commercial and Industrial 能源 Efficiency Program. An incentive of $125 per hp is available for installing a VSD/VFD on chilled water pumps, 冷凝器水泵, 冷却塔风机, 供应, 返回, 外面的空气, 补充风机和热水泵.

资格, VSD/VFD must be installed on variably-loaded electric motors, that are not required by code for new construction. The motors must be less than 300 hp and operate at least 2,每年000小时, 可能会有一些例外. All VSD/VFD installations must comply with hg8868皇冠下载’s Rule K “Practices and Requirements for Harmonic Control.”


Costs vary depending on the size of motor and how often the fan operates annually. The payback period, including incentives, is typically between six months and two years.