I noticed the LVEA average temperature started to fluctuate about half a degree after power outage on the 20th. The deeper drop only occur once every two days around 16:00-17:00 UTC (9-10 am PDT) follow by a smaller drop (~.2 degrees) that also occur every two days around the same time. Is this related to the on going heater problem at the corner station? What's special about 9-10 am? If this is the response to the temperature change outside why don't I see the rise in LVEA temperature when the outside temperature cools down in the evening?
The cooling trend is unrelated to the power outage - only coincidence. Not coincidence that it is October going on to November!
The coldest part of the morning is just before sunrise and there is some lag before the building can respond. A similar lag occurs at nightfall - the building, as well as the outdoor air and ground, have warmed all day and it takes some time for all this to cool.
Here are the zone average temperatures and a zone map of the LVEA, as well as some outside temperatures.
You can see that some zones are holding well while a few are not. The zones which are the furthest away from the air handler are also more exposed to outside conditions. The west wing of the LVEA has 3 exterior walls while the other areas do not have this same exposure. Zones 4 and 5 are relatively flat - these are the input and output areas of the IFO.
We are suffering for several reasons - some heaters are broken, and the reduced air flows required for quiet running increase the lag when responding to control signals. We may have to increase air flow to get a more uniform response in the LVEA. We can do this by turning on our 4th fan (preferred) or by increasing flow rates of the three which are running.
