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To add an third system, you just need to adjust the Pct Total controls on the improved side to remove load from the first two systems and activate the third system. You will have to use the detailed interface to do this.
We don’t have modelling to estimate the energy savings of bringing only the boiler inside the conditioned space. Changing the status of the distribution system would not be adequate, unless all of the distribution system was also located outside the envelope. The improvement that you are describing would improve the AFUE of the boiler by reducing some of the standby losses from the boiler tank. You will have to model this as an improvement to the boiler and estimate the change in AFUE yourself.
UPDATE:
OptiMiser will now automatically set the corresponding heating/cooling system to match a heat pump selection made in one of the systems and the cost is split between the two.If you have added custom items to the heat pump system lists, be sure that you have identically named items on both the heating and cooling lists or this new function will not work properly.
For the purposes of modelling in OptiMiser, an Attic is any ceiling for which the ceiling framing is separate from the roof framing and there is an enclosed, unconditioned buffer space between the ceiling and roof surfaces. An inaccessible attic would still be modeled in the Attic section.
Under no circumstance would you model the same area in both Attic and Ceiling.
For Attics, the pitch is intended to represent the pitch of the thermal boundary (e.g. the attic floor). In the vast majority of cases, the pitch and rise will be zero. One exception to this is a scissor truss roof. We consider this to be an “Attic” because there is an open buffer space above the insulation layer.
On the detailed Windows screen there is a button labeled Windows 2. That button accesses another screen just like the main screen where you can define a second window type and assign areas to the four directions. There is also a button labeled Add Skylights, Windows or Doors that accesses a third screen on which you can define four more unique glazing areas.
We are meeting with EVT this morning to discuss alternative chart designs. Once a path forward is chosen, we should be able to get a patch out today or early tomorrow. Apologies for the delay.
You’re not doing anything wrong. The problem is that the weather analysis pulls degree days for each bill period. In your case there is only one period with annual usage, so there isn’t monthly degree day data to generate a nice looking apportionment of the heating load. The usage then ends up getting apportioned across the months by number of days. I’m disappointed that this issue wasn’t exposed before release in VT. That chart is obviously a poor choice for the report in cases like yours. We are working on an alternative.
The options that you see depend on the selection that you make in the Condition control (e.g. Conditioned or Unconditioned). If the crawl space is unconditioned, then the insulation controls represent insulation added to the floor above the crawl space and there is a spray foam option in the Cavity insulation. If the crawl space is conditioned, then there is only one insulation option, representing insulation applied to the crawl space wall and it will also have spray foam as an option.
Yes, as long as you have complete data fro all heating sources over that 3 year period, you can set the range to cover 3 years. However, if there is significant electric heat, then it would be better to stick to the same span as the electric bills at this time.
I would like to make it possible to run a separate heating analysis for the electric bills, which would lift that restriction. However at this time the utility heating analysis has to run all heating sources together.
