added video plots to docs (7db3bc20) · Commits · Smart Buildings / EngineeringScienceBuilding

docs/6-trends.md

+15 −5

Changes for docs/6-trends.md: 15 added lines, 5 removed lines.
Original line number	Diff line number	Diff line
		@@ -7,25 +7,33 @@ An aggregate analysis of measurements over days reveals trends in sensor reading

		## Temperature

		![Temperature trends](img/6-temps.png)
		<video width="640" height="480" controls>
		<source src="img/6-temps.mp4">
		</video>

		The plot shows ambient, wet-bulb, and chiller temperatures at various points. The water loops for the chiller and condenser show a consistent temperature drop throughout the day. However, the drops in the condenser loop show more variation.

		## Coefficient of Performance

		![COP](img/6-COP.png)
		<video width="640" height="480" controls>
		<source src="img/6-COP.mp4">
		</video>

		The theoretical maximum COP, `COPMax` and the achieved COP by the entire chiller system, `COP` are plotted. There's a consistent gap between achieved and theoretical values, indicating room for improvement. However, reaching `COPMax` gets harder as the gulf narrows.

		## Input power vs. cooling

		![cooling](img/6-pow-vs-cooling.png)
		<video width="640" height="480" controls>
		<source src="img/6-pow-vs-cooling.mp4">
		</video>

		The plot of `PowIn` and `Tons` of cooling (both in watts) shows how more power is needed earlier in the day. The amount of cooling remains more or less consistent during daylight hours.

		## Condenser/cooling tower cycle power

		![cooling tower cycle](img/6-cooling-tower-pow.png)
		<video width="640" height="480" controls>
		<source src="img/6-cooling-tower-pow.mp4">
		</video>

		The plot shows that the controller maintains a consistent level of cooling for the condenser water loop (`TempCondOut - TempCondIn`). To achieve that, the two fans in the cooling tower vary their power consumption to ensure sufficient evaporative cooling via circulating air. The condenser water pump varies the throughput of the cooling tower.

		@@ -35,7 +43,9 @@ During warmer parts of the day, the gap between ambient and wet-bulb temperature

		## Cooling tower fan power and fan speed

		![power and speed](img/6-fan-power-speed.png)
		<video width="640" height="480" controls>
		<source src="img/6-fan-power-speed.mp4">
		</video>

		A plot of the control variable (fan speed) and the resulting power consumption shows that while power consumption generally tracks fan speed, additional variables also come into play. A moving average over a 1 hour window of mean fan A and B consumptions is shown for illustration.