No Hydronic/DHW Dual Use

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We have projects from time to time in which either a central boiler system or 
individual water heaters provide both DHW and hydronic space heating, usually 
to dwelling units.There is currently no way to do this from what I've 
determined.

When a heating coil is set to type "HotWater", if the inlet and outlet fluid 
segments are selected from a fluid system of type "ServiceHotWater", CBECC-Com 
throws an error demanding that these be from a fluid system of type "HotWater". 
So the program does not currently allow a storage water heater with dual use 
capacity, such as Apollo's water heaters.

When, conversely, the supply fluid segment from a fluid system of type 
"HotWater" with a boiler is chosen for the SHW, the calculation completes, but 
completes as if there is no DHW.

I tried to add a storage water heater to the "HotWater" fluid system alongside 
the boiler and using the boiler's fluid segments. That resulted in a zero 
baseline and a 1-point proposed for DHW.

The final attempt looked at a RecirculationDHWSystem. There appears to be no 
way of leading hydronic space heating fluid segments out of a recirc system in 
a way that a HotWater heating coil can connect with it.

Original issue reported on code.google.com by f.le...@gmail.com on 7 Jun 2014 at 12:31

Attachments:

• Dwight_Flr1_Library3_hydro_boiler_space_dhw.cibd

[GoogleCodeExporter]

Nikhil: I had some preliminary discussion this morning with the development 
team and looks like we may be able to accomplish this though they would need to 
look at it a bit closely. I do have a request from the team to see if there is 
a one-line schematic diagram of the system from a typical project (mechanical 
schedules) that we can use as a reference. Is this something you can provide?

Original comment by rhedr...@archenergy.com on 9 Jun 2014 at 5:02

• Added labels: Type-Enhancement
• Removed labels: Type-Defect

[GoogleCodeExporter]

See email from Nikhil on 6/9/14 @ 09:39 MDT for additional information from 
user.

Original comment by rhedr...@archenergy.com on 9 Jun 2014 at 5:04

[GoogleCodeExporter]

Changing to low priority, as I believe this will be addressed in v3b/v4

Original comment by da...@360-analytics.com on 6 Aug 2014 at 7:45

• Added labels: Priority-Low
• Removed labels: Priority-Medium

[GoogleCodeExporter]

Switching to WontFix to close since this system type is already on the list of 
enhancements for v4 or beyond

Original comment by da...@360-analytics.com on 8 Aug 2014 at 6:28

• Changed state: WontFix