B&G’s PLEV formula creates a modern standard for the industry, providing the most accurate specification of a centrifugal pump at partial flow rates, in turn helping to eliminate oversizing often associated with system design.

PLEV is derived from the successful Integrated Part Load Value (IPLV) performance calculation developed by the Air- Conditioning, Heating and Refrigeration Institute (AHRI) in AHRI 550/590-1998. The proven formula describes the equipment efficiency while operating at various capacities of a chiller system, and is crucial in supporting energy use and operating costs throughout the lifetime of the system. B&G engineers have adapted the formula for centrifugal pumps used in HVAC systems and updated B&G’s ESP-PLUS online selection software with the PLEV selection criteria.