| tank |
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|
interface to Ecotope HPWH model (used as tank) |
HPWHLINK
| Name |
Type |
Variability |
Description/Comments |
| tank.HSCount |
number |
End of subhour |
# of HPWH heatsources in use for current config |
| tank.tEx |
number |
End of subhour |
tank surround temp, F |
| tank.tASHPSrc |
number |
End of subhour |
temp of heat pump air source, F |
| Name |
Type |
Variability |
Description/Comments |
| tank.nQTXNodes |
number |
End of subhour |
- # of tank 1/12s used in hw_qTX extra tank heat
- corresponds to nodes for HPWH default 12 node setup
|
| Name |
Type |
Variability |
Description/Comments |
| tank.fMixUse |
number |
End of subhour |
- factor for draw adjustment re HPWH setpoint > [DHWSYS][dhwsys]::ws_tUse
- Some HPWHs (e.g. SANCO2) have fixed (high) setpoints
- draws are reduced to balance load at ws_tUse.
|
| tank.fMixRL |
number |
End of subhour |
- factor for loop return flow adjustment re HPWH setpoint > [DHWSYS][dhwsys]::ws_tUse
- Some HPWHs (e.g. SANCO2) have fixed (high) setpoints
- Loop return flow is reduced to balance load at ws_tUse.
|
| Name |
Type |
Variability |
Description/Comments |
| tank.inElec[index] |
DBL Array [2] |
End of subhour |
- current subhr HPWH electricity use, kWh
- [0]=primary(=compressor or non-HP resistance) + misc
- [1]=resistance backup (iff HP) (not including hw_HPWHxBU)
|
| tank.heatAdded[index] |
DBL Array [2] |
End of subhour |
- current subhr HPWH heat added to water, kWh
- [0]=primary(=compressor or non-HP resistance)
- [1]=resistance backup (iff HP) (not including hw_HPWHxBU)
|
| tank.tOut |
DBL |
End of subhour |
- last tick HPWH outlet temp, C
- 0 if no draw
|
| tank.tOutCHDHW |
DBL |
End of subhour |
- last tick output temp available to CHDHW, F
- 0 if no draw
|
| tank.HPWHxBU |
number |
End of subhour |
- current subhr HPWH add'l backup resistance heat, Btu
- output water heated to ws_tUse iff HPWH output temp < ws_tUse
|
| tank.qEnv |
DBL |
End of subhour |
- current subhr heat removed by HPWH from environment, kWh
- + = to water heater; for 1 [DHWHEATER][dhwheater] (no wh_mult)
|
| tank.qLoss |
DBL |
End of subhour |
- current subhr HPWH standby losses, kWh. + = to surround
- for 1 [DHWHEATER][dhwheater] (no wh_mult)
|
| tank.qHW |
DBL |
End of subhour |
- current subhr HPWH total delivered hot water heating, kWh. always >= 0
- for 1 [DHWHEATER][dhwheater] (no wh_mult)
- calc'd from flows and temp diffs (unlike hw_heatAdded)
- includes heat to [DHWLOOP][dhwloop] and CHDHW, does not include hw_HPWHxBU
|
| tank.qTX |
DBL |
End of subhour |
current subhr extra heat tank heat added, kWh (not Btu) |
| Name |
Type |
Variability |
Description/Comments |
| tank.tankHCNominal |
number |
End of subhour |
- nominal HPWH tank heat content, kWh (at 40 C)
- used as normalizing factor for energy balance checks
|
| tank.tankHCBeg |
DBL |
End of subhour |
current step beginning tank heat content, kWh |
| tank.tankHCEnd |
DBL |
End of subhour |
current step end tank heat content, kWh |
| Name |
Type |
Variability |
Description/Comments |
| tank.tHWOutF |
DBL |
End of subhour |
current substep working total re calc of hw_tHWOut |
| tank.nzDrawCount |
number |
End of subhour |
current substep # of draws > 0 |
| tank.tHWOut |
number |
End of subhour |
- average hot water temp, F (at water heater)
- includes XBU: hw_tHWOut >= ws_tUse
- calc'd at substep end only
|
| Name |
Type |
Variability |
Description/Comments |
| tank.bWriteCSV |
number |
End of subhour |
write HPWH debugging CSV iff nz |
| Name |
Type |
Variability |
Description/Comments |
| tank.qBal |
DBL |
End of subhour |
current step HPWH heat balance, kWh (s/b 0) |
| tank.balErrCount |
number |
End of subhour |
annual count of energy balance errors |
| tank.balErrMax |
DBL |
End of subhour |
maximum substep energy balance error for run, kWh |
|
| tankVol |
FLOAT_GZ |
Start of run |
- tank volume, gal
- default: 1.5 gal/ft2 collector area
|
| tankUA |
FLOAT_GEZ |
Start of run |
- tank water-to-air UA, Btuh/F
- default: derived from sw_tankVol and sw_tankInsulR
|
| tankInsulR |
FLOAT_GZ |
Start of run |
- total tank insulation resistance, hr-F/Btuh
- = built-in + exterior wrap
|
| tankZnTi |
TI |
input time |
- Tank location zone re tank loss
- 0 iff sw_tankTEx being used
- heat losses go to half to zone air / half radiant
|
| tankTEx |
number |
Start of hour |
- surrounding temperature, F for tank loss
- when sw_tankTEx set
- - sw_tankZnTi ignored
- - heat loss discarded
|
| tankTAvg |
number |
End of hour |
hour average tank temp, F (check figure) |
| tankQLoss |
number |
End of hour |
- current hour's total tank loss, Btu
- for 1 tank (sw_mult)
|
| tankHXEff |
number |
Start of hour |
tank heat exchanger effectiveness |
| tankTHxLimit |
FLOAT_GZ |
input time |
- tank temp limit, F; collector heat
- discarded when sw_tankTHx > sw_tankTHxLimit
- default = 180 F
|
| overHeatTkCount |
number |
End of hour |
- # of ticks in this hour when collector did not run
- due to swtankTHx > sw_tankTHxLimit
|