4.38 DHWLOOPBRANCH
DHWLOOPBRANCH constructs one or more objects representing a branch pipe from the preceding DHWLOOPSEG. A DHWLOOPSEG can have any number of DHWLOOPBRANCHs to represent pipe runs with differing sizes, insulation, or surrounding conditions.
wbName
Optional name of segment; give after the word “DHWLOOPBRANCH” if desired.
| Units | Legal Range | Default | Required | Variability |
|---|---|---|---|---|
| 63 characters | none | No | constant |
wbMult=float
Specifies the number of identical DHWLOOPBRANCHs. Note may be non-integer.
| Units | Legal Range | Default | Required | Variability |
|---|---|---|---|---|
| x \(>\) 0 | 1 | No | constant |
wbLength=float
Length of branch.
| Units | Legal Range | Default | Required | Variability |
|---|---|---|---|---|
| ft | x \(\ge\) 0 | 0 | No | constant |
wbSize=float
Nominal size of pipe. CSE assumes the pipe outside diameter = size + 0.125 in.
| Units | Legal Range | Default | Required | Variability |
|---|---|---|---|---|
| in | x \(>\) 0 | none | Yes | constant |
wbInsulK=float
Pipe insulation conductivity
| Units | Legal Range | Default | Required | **Variability |
|---|---|---|---|---|
| Btuh-ft/ft2-oF | x \(>\) 0 | 0.02167 | No | constant |
wbInsulThk=float
Pipe insulation thickness
| Units | Legal Range | Default | Required | Variability |
|---|---|---|---|---|
| in | x \(\ge\) 0 | 1 | No | constant |
wbExH=float
Combined radiant/convective exterior surface conductance between insulation (or pipe if no insulation) and surround.
| Units | Legal Range | Default | Required | Variability |
|---|---|---|---|---|
| Btuh/ft2-oF | x \(>\) 0 | 1.5 | No | hourly |
wbExCnd=choice
Specify exterior conditions.
| Choice | Description |
|---|---|
| ADIABATIC | Adiabatic on other side |
| AMBIENT | Ambient exterior |
| SPECT | Specify temperature |
| ADJZN | Adjacent zone |
| GROUND | Ground conditions |
| Units | Legal Range | Default | Required | Variability |
|---|---|---|---|---|
| See table above | SPECT | No | constant |
wbAdjZn=float
Boundary conditions for adjacent zones.
| Units | Legal Range | Default | Required | Variability |
|---|---|---|---|---|
| x \(>\) 0 | 0.0 | No | runly |
wbExTX=float
External boundary conditions.
| Units | Legal Range | Default | Required | Variability |
|---|---|---|---|---|
| x \(>\) 0 | 70.0 | No | runly |
wbFUA=float
Adjustment factor applied to branch UA. UA is derived (from wbSize, wbLength, wbInsulK, wbInsulThk, and wbExH) and then multiplied by wbFUA. Used to represent e.g. imperfect insulation. Note that parent DHWLOOP wlFUA does not apply to DHWLOOPBRANCH (only DHWLOOPSEG)
| Units | Legal Range | Default | Required | Variability |
|---|---|---|---|---|
| x \(\ge\) 0 | 1 | No | constant |
wbExT=float
Surrounding equivalent temperature.
| Units | Legal Range | Default | Required | Variability |
|---|---|---|---|---|
| oF | x \(>\) 0 | 70 | No | hourly |
wbFlow=float
Branch flow rate assumed during draw.
| Units | Legal Range | Default | Required | Variability |
|---|---|---|---|---|
| gpm | x \(\ge\) 0 | 2 | No | hourly |
wbFWaste=float
Number of times during the hour when the branch volume is discarded.
| Units | Legal Range | Default | Required | Variability |
|---|---|---|---|---|
| x \(\ge\) 0 | 0 | No | hourly |
endDHWLOOPBRANCH
Optionally indicates the end of the DHWLOOPBRANCH definition.
| Units | Legal Range | Default | Required | Variability |
|---|---|---|---|---|
| none | none | No |
Related Probes: