Hi all,
I have a question about Type 700, the boiler component, if someone has experience with it. I have a flow profile running into a tank, with a boiler loop circulating through it to meet the energy demand. Boiler is set to 1 million kJ/hr which is just enough to meet the temperature demand of the tank at its peak load.
Here is the problem:
I have my flow operating 4 days out of the week. At first I only had the boiler turning off when the temperature was met (controller with 2, -2 deadbands). When I looked at the required boiler energy input integrated over the course of the year, the number looked right, but I wanted to reduce it. In order to do this, I used another controller on a time delay to lock out the first controller the other 3 days of the week, so the boiler wasn’t trying to heat the tank all weekend wasting useless energy.
What I noticed however was the required energy input barely changed. I know the new controller works properly, because I can now see the tank temperature dropping after the first 4 days and then not rising until a few hours before the start of the week.
I think the energy savings should be more significant. I’m only saving around 10 therms a year in a 8500 gallon system. This is very small. The boiler should be saving that at least every day it is turned off.
Any ideas why the difference is so small?