engines used by the BMW and MINI brands, and itâs an improved version of the N54 and N55 units which both own awards in the past. The BMW N55 engine was something of legend. It was easily one of the best engines on the market throughout its entire tenure, regardless of what else was on the market.
Definition - What does Windows Presentation Foundation (WPF) mean? Windows Presentation Foundation (WPF) is a part of the Windows operating system that provides graphical user interfaces and environments for applications and services tha are developed and executed on Windows OS. WPF is a subsystem in the Windows OS that appeared in the Windows Vista version.
more HVAC definitions. HSPF is an abbreviation for Heating Seasonal Performance Factor. It is the most commonly used measure of the heating efficiency of heat pumps.(The cooling efficiency of a heat pump is measured by its SEER .). Technically speaking, the HSPF is a heat pump's estimated seasonal heating output in BTUs divided by the amount of energy that it consumes in watt-hours. heat pump with a high HSPF is more efficient than a heat pump with a low HSPF. New heat pumps manufactured after 2005 are required to have an HSPF of at least 7.7. The most efficient heat pumps have an HSPF of 10.