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.
The efficiency of air conditioners are often rated by the HSPF as defined by the Air Conditioning, Heating, and Refrigeration Institute in its standard 210/240 Performance Rating of Unitary Air-Conditioning and Air-Source Heat Pump Equipment.he higher the HSPF rating of a unit, the more energy efficient it is. HSPF is a ratio of BTU heat output over the heating season to watt-hours of electricity used. It has units of BTU/watt-hr. Depending on the system, an HSPF â¥ 8 can be considered high efficiency and worthy of a US Energy Tax Credit.