Tyler "has recently changed the chiller pumps to not be on at all times and come on when needed. He gave me some data for when the EX chiller has been turning on and off over the last 2.5 weeks" (TJ, 2023). I took this data and plotted it against our range as well as the average internal temperature at EX to see if we would lose range when the chiller at EX turned on(attachment1).
Over this date range, the longest amount of time that the chiller was on consistently was for just over two hours. With both these longer segments and the more regular shorter segments of 'on' time (sometimes just 10 minutes on), there is no noticeable change in the range when the chiller turns on or off. There are multiple times where the range trends downward after the chiller starts turning on for longer stretches of time (red attachment2), but it is not consistent - yellow(attachment3) and green(attachment4) rectangles show the range rising with chiller 'on' times. Therefore I am inclined to attribute the lowering of the range during these times as being due to changes in indoor/outdoor temperatures and wind and not the chiller.
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Thank you for getting these out Oli, this is great! I agree with you that it doesn't seem like this chiller pump has any direct impact on our range, though perhaps we might want to consider looking further into a possible correlation of VEA temps and our range.
Clarification: It is not the chiller "pump" that was reconfigured to run only when demanded. It was the chiller themselves. It's also not clear that this was the status quo for all chillers across site. It was only recently discovered on one chiller in particular. The chiller "pump" has always and will continue to run regardless of the state of the chiller itself as glycol needs to be continually cycled through the AHU cooling coils at all times.