added plots, cooling tower analysis (0ffc3c82) · Commits · Smart Buildings / EngineeringScienceBuilding

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Changes for docs/3-cooling-tower.md: 1 added line, 1 removed line.
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		Cooling towers are used to expel heat from warm water coming out of water-cooled condensers in chiller units. The water has absorbed heat from the chiller's refrigerant as it condenses. There are three ways to transfer heat out of water:

		1. Dry cooling: Heat transfer between water and ambient air through a surface for e.g. coils. Closed loop - no water lost.
		1. Dry cooling: Heat transfer between water and ambient air through a surface for e.g. coils. Closed loop - no water lost. Conduction.

		2. Wet cooling: Evaporative cooling. Temperature may go below ambient temperature down to wet-bulb temperature. Open process e.g. pans/pools - water is lost through evaporation.

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		@@ -27,14 +27,15 @@ Flow rates are converted from gallons per hour to cubic metres per second.

		Fields with explicit units (`kWperTon`) are not converted.

		## Fleid names
		## Field names

		Fields are manually renamed to remove spaces, punctuation characters, and application specific designations.

		Sensor fields are first prefixed by type of measurement:

		* Temperature: `Temp`.
		* Temperature: `Temp`
		* Power: `Pow`
		* Frequency: `Freq`
		* Flow rate: `Flow`
		* Percentage: `Per`

		@@ -63,6 +64,12 @@ The following empirical and physical relationships are used:

		These operations are defined in `thermo.py` and called in `preprocess.py` to clean up csv files.

		## Missing/zero power values

		In several measurements power is recorded as 0. However this may not reflect the actual state of the system and may simply be an error in logging/networking or a temporary fluctuation. Because the cause of a zero measurement is indeterminate, such records are not considered during analysis.

		In essence, the system is analyzed only at the states when all components (chiller, water pumps, fans) are operational.

		[1]: https://en.wikipedia.org/wiki/Arden_Buck_equation
		[2]: https://en.wikipedia.org/wiki/Dew_point#Calculating_the_dew_point
		[3]: https://journals.ametsoc.org/doi/pdf/10.1175/JAMC-D-11-0143.1