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
Type: float
Specifies the number of identical DHWLOOPBRANCHs. Note may be non-integer.
| Units | Legal Range | Default | Required | Variability |
|---|---|---|---|---|
| x \(>\) 0 | 1 | No | constant |
wbLength
Type: float
Length of branch.
| Units | Legal Range | Default | Required | Variability |
|---|---|---|---|---|
| ft | x \(\ge\) 0 | 0 | No | constant |
wbSize
Type: 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
Type: float
Pipe insulation conductivity
| Units | Legal Range | Default | Required | Variability |
|---|---|---|---|---|
| Btuh-ft/ft2-oF | x \(>\) 0 | 0.02167 | No | constant |
wbInsulThk
Type: float
Pipe insulation thickness
| Units | Legal Range | Default | Required | Variability |
|---|---|---|---|---|
| in | x \(\ge\) 0 | 1 | No | constant |
wbExH
Type: 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
Type: 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
Type: float
Boundary conditions for adjacent zones.
| Units | Legal Range | Default | Required | Variability |
|---|---|---|---|---|
| x \(>\) 0 | 0.0 | No | runly |
wbExTX
Type: float
External boundary conditions.
| Units | Legal Range | Default | Required | Variability |
|---|---|---|---|---|
| x \(>\) 0 | 70.0 | No | runly |
wbFUA
Type: 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
Type: float
Surrounding equivalent temperature.
| Units | Legal Range | Default | Required | Variability |
|---|---|---|---|---|
| oF | x \(>\) 0 | 70 | No | hourly |
wbFlow
Type: float
Branch flow rate assumed during draw.
| Units | Legal Range | Default | Required | Variability |
|---|---|---|---|---|
| gpm | x \(\ge\) 0 | 2 | No | hourly |
wbFWaste
Type: 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: