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2. Surge in compressors - Wikipedia

   en.wikipedia.org/wiki/Surge_in_compressors

   While fully developed compressor surge is axisymmetric, its initial phase is not necessarily axisymmetric. Actually, severe damage of compressor surge is often related to very large transverse loads on blades and casing in its initial transient. [7] A chain reaction of compressor surge is the flameout of a jet engine. Due to a lack of air ...

3. Why sudden loud booms sometimes occur when it's very cold outside

   www.aol.com/weather/why-sudden-loud-booms...

   During extreme cold events, you may hear a loud boom and feel like you have experienced an earthquake. However, this event was more likely a cryoseism, also known as an ice quake or a frost quake ...

4. Fan coil unit - Wikipedia

   en.wikipedia.org/wiki/Fan_coil_unit

   These motors are sometimes called DC motors, sometimes EC motors and occasionally DC/EC motors. DC stands for direct current and EC stands for electronically commutated.. DC motors allow the speed of the fans within a fan coil unit to be controlled by means of a 0-10 Volt input control signal to the motor/s, the transformers and speed switches associated with AC fan coils are not required.

5. Compressor stall - Wikipedia

   en.wikipedia.org/wiki/Compressor_stall

   Axi-symmetric stall, more commonly known as compressor surge; or pressure surge, is a complete breakdown in compression resulting in a reversal of flow and the violent expulsion of previously compressed air out through the engine intake, due to the compressor's inability to continue working against the already-compressed air behind it.

6. Infiltration (HVAC) - Wikipedia

   en.wikipedia.org/wiki/Infiltration_(HVAC)

   In cold climates, with a 15 MPH wind, residences often have air exchange rates of 1.0 to 1.5 ACHs, far in excess of the ventilation air needs and are thus called loose construction. It is very easy to reduce infiltration rates to less than 1.0 ACH. Smoke candles and blower-door tests can help identify less-than-obvious leaks.

7. Weird winter weather: Cold and snow to the East, but rain and ...

   www.aol.com/weird-winter-weather-cold-snow...

   Freeze watches and cold advisories extend to northern Florida and southeast Georgia. Weather forecast for Saturday, Dec. 21, 2024, into Sunday, Dec. 22, 2024. First day of winter is here: Snow and ...