terminal

input, in addition to AUTOSIZE tuhcCaptRat, tuVfMxH, tuVfMxC, tuVfMn (these set FsAS field status flag)

Name	Type	Variability	Description/Comments
tuVfMxHC	choice:DIFFSAME	Start of phase	autoSize tuVfMxH and -C SAME or (default) different.
fxCapH	FLOAT_GZ	Start of phase	capacity factor for autoSized heat coil (default 1.1 = 10% oversized)
fxVfHC	FLOAT_GZ	Start of phase	air flow factor for autoSized air flow (default 1.1 = 10% oversized)

setup

Name	Type	Variability	Description/Comments
asHcSame	BOO	Start of run	TRUE to autoSize tuVfMxH and -C the same -- specified with "tuVfMxHC = SAME"
asKVol	BOO	Start of run	TRUE to autoSize for constant volume -- specified with "[AUTOSIZE][autosize] [tuVfMn][tuvfmn]" (implies asHcSame). runtime
hcAs			autoSizing data members substruct re tuhc.captRat -- local heat heat coil capacity.
AUSZ ---setup time members Name Type Variability Description/Comments hcAs.az_active BOO Start of run TRUE iff autoSizing this member ---runtime set at initialization Name Type Variability Description/Comments hcAs.az_a number End of subhour 1a size (load) -- max of warmup-converged design days pass 1 part b and pass 2: enlarge size if necess, real models. hcAs.az_b number End of subhour 1b rated size plus increases during simulation incl pass 2 -- max of design days for pass 2 (increase size if necess, measure load, reduce oversize sizes) and for main sim load reports hcAs.ldPk number End of subhour largest load this design day iteration or in main sim hcAs.ldPkAs number End of day autoSize peak load: max of warmup-converged design days hcAs.ldPkAs1 number End of day autoSize pass 1 peak load, re reporting overloads of devices that only exceed limit on pass 1, eg supply fan when sizing terminals, 7-6-95. hcAs.plrPk number End of subhour largest plr this design day iteration or in main sim hcAs.plrPkAs number End of day autoSize peak plr: max of warmup-converged design days hcAs.xPk number End of subhour rated size (*px) when plrPk set hcAs.xPkAs number End of day rated size (xPk) when plrPkAs set - use when reducing oversize in case x has changed. 6-97. hcAs.az_notDone BOO End of day re convergence: nz says this AUSZ requires additional iterations set to 0 at beg of each iteration; incrd anywhere is calcs if not converged see also Top.tp_auszNotDone = overall notdone flag
vhAs			.. re tuVfMxH -- air heat max flow
AUSZ ---setup time members Name Type Variability Description/Comments vhAs.az_active BOO Start of run TRUE iff autoSizing this member ---runtime set at initialization Name Type Variability Description/Comments vhAs.az_a number End of subhour 1a size (load) -- max of warmup-converged design days pass 1 part b and pass 2: enlarge size if necess, real models. vhAs.az_b number End of subhour 1b rated size plus increases during simulation incl pass 2 -- max of design days for pass 2 (increase size if necess, measure load, reduce oversize sizes) and for main sim load reports vhAs.ldPk number End of subhour largest load this design day iteration or in main sim vhAs.ldPkAs number End of day autoSize peak load: max of warmup-converged design days vhAs.ldPkAs1 number End of day autoSize pass 1 peak load, re reporting overloads of devices that only exceed limit on pass 1, eg supply fan when sizing terminals, 7-6-95. vhAs.plrPk number End of subhour largest plr this design day iteration or in main sim vhAs.plrPkAs number End of day autoSize peak plr: max of warmup-converged design days vhAs.xPk number End of subhour rated size (*px) when plrPk set vhAs.xPkAs number End of day rated size (xPk) when plrPkAs set - use when reducing oversize in case x has changed. 6-97. vhAs.az_notDone BOO End of day re convergence: nz says this AUSZ requires additional iterations set to 0 at beg of each iteration; incrd anywhere is calcs if not converged see also Top.tp_auszNotDone = overall notdone flag
vcAs			.. re tuVfMxC -- air cool max flow
AUSZ ---setup time members Name Type Variability Description/Comments vcAs.az_active BOO Start of run TRUE iff autoSizing this member ---runtime set at initialization Name Type Variability Description/Comments vcAs.az_a number End of subhour 1a size (load) -- max of warmup-converged design days pass 1 part b and pass 2: enlarge size if necess, real models. vcAs.az_b number End of subhour 1b rated size plus increases during simulation incl pass 2 -- max of design days for pass 2 (increase size if necess, measure load, reduce oversize sizes) and for main sim load reports vcAs.ldPk number End of subhour largest load this design day iteration or in main sim vcAs.ldPkAs number End of day autoSize peak load: max of warmup-converged design days vcAs.ldPkAs1 number End of day autoSize pass 1 peak load, re reporting overloads of devices that only exceed limit on pass 1, eg supply fan when sizing terminals, 7-6-95. vcAs.plrPk number End of subhour largest plr this design day iteration or in main sim vcAs.plrPkAs number End of day autoSize peak plr: max of warmup-converged design days vcAs.xPk number End of subhour rated size (*px) when plrPk set vcAs.xPkAs number End of day rated size (xPk) when plrPkAs set - use when reducing oversize in case x has changed. 6-97. vcAs.az_notDone BOO End of day re convergence: nz says this AUSZ requires additional iterations set to 0 at beg of each iteration; incrd anywhere is calcs if not converged see also Top.tp_auszNotDone = overall notdone flag
qhPk	number	End of subhour	peak values of qh and qc, for load reports and -PkAs's. qc negative.
qcPk	number	End of subhour	peak values of qh and qc, for load reports and -PkAs's. qc negative.
qhPkAs	number	End of subhour	peak values for all autoSize converged design days, for size reports [tuVfMn][tuvfmn], -MxH, -C saved at entry to hvacIterSubhr for conditional backtracking while autoSizing
qcPkAs	number	End of subhour	peak values for all autoSize converged design days, for size reports [tuVfMn][tuvfmn], -MxH, -C saved at entry to hvacIterSubhr for conditional backtracking while autoSizing
bVfMn	AFLOW_GEZ	End of subhour	flags TRUE if dT too low for autoSizing tuVfMxH, C (supply temp too close to zone temp, eg due to weak ah coil)
bVfMxH	AFLOW_GEZ	End of subhour	flags TRUE if dT too low for autoSizing tuVfMxH, C (supply temp too close to zone temp, eg due to weak ah coil)
bVfMxC	AFLOW_GEZ	End of subhour	flags TRUE if dT too low for autoSizing tuVfMxH, C (supply temp too close to zone temp, eg due to weak ah coil)
dtLoHSh	BOO	End of subhour	.. this subhr, set in cnztu.cpp:ztuMode, cleared in ztuAbs.
dtLoCSh	BOO	End of subhour	.. this subhr, set in cnztu.cpp:ztuMode, cleared in ztuAbs.
aDtLoHSh	BOO	End of subhour	.. this subhr, set at end of cnah1.cpp:ahCompute
aDtLoCSh	BOO	End of subhour	.. this subhr, set at end of cnah1.cpp:ahCompute
aDtLoTem	BOO	End of subhour	cnah2:antRatTs to ahCompute temp flag re aDtLoHSh, CSh
dtLoH	BOO	End of subhour	.. on this autoSizing design day iteration (or poss run)
dtLoC	BOO	End of subhour	.. on this autoSizing design day iteration (or poss run)
dtLoHAs	BOO	End of day	.. on any converged pass 2 design day: invokes endAutosizing() message. runtime: results: see COIL tuhc.captRat_As, [tuVfMn][tuvfmn]/MxH/MxC_As, ditto _AsNov, below.
dtLoCAs	BOO	End of subhour	.. on any converged pass 2 design day: invokes endAutosizing() message. runtime: results: see COIL tuhc.captRat_As, [tuVfMn][tuvfmn]/MxH/MxC_As, ditto _AsNov, below.

next 2: if neither given, no LH; if setpoint given, tstat-controlled; else if tuQMnLh given, constant power.

Name	Type	Variability	Description/Comments
tuTLh	TEMP_GZ	Start of hour	local heating set point for tstat control. hourly. default: no tstat control.
tuQMnLh	POWER_GEZ	Start of hour	desired continuous output (Btuh) if no setpoint, or minimum if [tuTLh][tutlh] given, hourly, default 0. rest of LH variables disallowed if neither of above given (no LH)

Name	Type	Variability	Description/Comments
tuQMxLh	POWER_GEZ	Start of hour	max desired power, subject to plant limits, Btuh, hourly, RQD if [tuTLh][tutlh] given, else disallowed. *r POWER_GEZ tuQDsLh // was intended to apportion power upon plant overload; instead, using [tuhcCaptRat][tuhccaptrat], 9-92. dflt was max([tuQMnLh][tuqmnlh],[tuQMxLh][tuqmxlh]) or RQD if any of those vbl & [tuTLh][tutlh] or [tuQMnLh][tuqmnlh] given.
tuPriLh	SI_GZ	Start of phase	priority if setpoint equals another, low #'s used first, dfl 100, disallowed if tuTLh not given.
tuLhNeedsFlow	choice:NOYES	Start of phase	YES to disable lh when tu fan off and central fan off or VAV flow 0 (coil in terminal). NO if can heat without flow (baseboard). default: NO.

Name	Type	Variability	Description/Comments
tuhc			subrecord for terminal coil, type ELECTRIC or HW. following terminal local heat inputs are in tuhc, and now more!: COILTYCH [tuhcType][tuhctype] // choice of ELEC, HW (hot water), ... . constant. // default NONE if no local heat, else ELEC. //sched: no schedule input for terminal coil: always available, do scheduling with setpoints or min/max heat. POWER_GZ [tuhcCaptRat][tuhccaptrat] // rated capacity (Btu/hr), constant, RQD. TI [tuhcMtr][tuhcmtr] // MTR to which to charge energy use for non-plant-supported coil types.
HEATCOIL Name Type Variability Description/Comments tuhc.coilTy choice:COILTY Start of run coil type choice according to application, as follows. constant. air handler cool coil: NONE (default), ELEC, DX, CHW, ... air handler heat coil: NONE (default), ELEC, HW, GAS, OIL, AHP, ... terminal heat coil: NONE (default if no local heat), ELEC (dflt if local heat), HW, GAS,OIL??... "ELEC COOL COIL" is a testing aid that cools with 100% efficiency & capacity at any temp. Name Type Variability Description/Comments tuhc.sched OFFAVAILVC Start of hour AVAIL when coil available, OFF when disabled, hourly, default AVAIL. sensible cap'y: see COOLCOIL.capsRat. Name Type Variability Description/Comments tuhc.captRat POWER_NZ End of subhour *s *e for probes, cuz autoSize changes it. hourly for input purposes. total rated cap'y (Btuh), RQD except AHP, ?CHW, hrly vbl for furnaces, const for DX coil. tuhc.captRat_As number Start of phase captRat determined by autoSizing, w less vbly for easier use in probes in main sim. 6-95. tuhc.captRat_AsNov number Start of phase raw captRat determined by autoSizing, before overSize added, for reports/probes. 7-95 cnausz.cpp code ASSUMES x, x_As, x_AsNov together for access thru one ptr. cuprobe.cpp's name search also requires together. tuhc.bCaptRat number End of subhour start-subHr captRat, to undo size increases not in use as converged at end subhr (ahhc,ahcc). Name Type Variability Description/Comments tuhc.eirRat number Start of hour rated load energy input ratio===heat input ratio===input/output===1/efficiency for DX,GAS,OIL at least. hrly vbl for GAS,OIL; constant for DX, . effRat: see HEATCOIL. Name Type Variability Description/Comments tuhc.mtri TI Start of phase MTR to which to charge coil main energy use, if not through a plant. Name Type Variability Description/Comments tuhc.aux POWER_GEZ Start of hour additional input energy used by auxiliary controls and devices. tuhc.auxMtri TI Start of phase Meter for auxiliary energy coil runtime members Name Type Variability Description/Comments tuhc.q number End of subhour average (not fan-on) output power level for subhour tuhc.qPr number End of subhour output at which coil's plant last computed, for call-flagging plant. set: cnhp.cpp. used: cncoil.cpp tuhc.p number End of subhour input power level this subhour, from plant or to charge to meter (*subhrDur!). p = input from plant tentative 9-92; implemented for HW coils. tuhc.plr number End of subhour current fan-on (or furnace-on) relative load (part load ratio) tuhc.plrAv number End of subhour current average relative load (plr * frFanOn) tuhc.eir number End of subhour energy input ratio: current input/output, fan on===average. Rob's addition, for probes, 5-92. tuhc.capMax number End of subhour maximum capacity this subhour, used to calculate tPossH/C. tuhc.pAux number End of subhour aux power this subhour has all members of base class COIL, and... heat coil additional input members CAUTION: HEATCOIL::setup code used to assume .effRat was 1st derived class member, 7-92. for GAS or OIL furnace "coil" in ah Name Type Variability Description/Comments tuhc.effRat FRAC_GZ Start of phase efficiency @ rated load: alternate eir input, converted into eirRat in setup. tuhc.pyEi cubic polynomial coefficients to correct full-load energy input for part load ratio for GAS or OIL heat coil. Default (per DOE2): .01861, 1.094209, -.112819, 0. PYCUBIC Name Type Variability Description/Comments tuhc.pyEi.k[index] number Array [5] Start of phase FLOAT k[5]. One extra member needed as terminator by cul.cpp array input logic, 5-92. possible future setup optimizations: 1) select ptr to fcn that does not compute terms whose k is 0; 2) precalculate constants to compute in form ((x*k[3] + k[2])*x + k[1])*x + k[0] tuhc.stackEffect number Start of hour fraction of unused capacity that must be used (increasing plr) to make up for increased infiltration due to hot stack when (indoor) furnace runs but not continuously. Default 0. Expect function of Top.tDbO. for HW coil tuhc.hpi TI Start of phase subscript of [HEATPLANT][heatplant] serving HW coil heat coil setup time members for HW coil tuhc.nxTu4hp TI Start of run TuB subscr of next TU with HW coil on same HEATPLANT. 1st is HEATPLANT.tu1. tuhc.nxAh4hp TI Start of run AhB subscr of next AH with HW coil on same [HEATPLANT][heatplant]. 1st is [HEATPLANT][heatplant].ah1. heat coil runtime members for GAS or OIL furnace "coil" in ah tuhc.flueLoss number End of subhour part-load flue loss this subhour, GAS and OIL only for HW or AHP coil tuhc.qWant number End of subhour HW: desired output===input, doHWCoil to hpCompute, used in determining capF. AHP: desired output, doAhpHeatCoil to doAhpHeat *s *e POWER q // current output power: is a COIL member. *s *e POWER qPr // output at which coil's plant last computed, for change-flagged plant: COIL member

• next 3 determine capability: heat setpoint given-->tstat ctrl'd heat cap; cool setpoint given-->tstat ctrl'd cool cap;
• neither sp given but min flow given-->continuous output at that flow regardless of zone temp.

Name	Type	Variability	Description/Comments
tuTH	TEMP_GZ	Start of hour	air heating set point (F). hourly. default: no tstat-controlled air heating.
tuTC	TEMP_GZ	Start of hour	air cooling set point (F). hourly. default: no tstat-controlled air cooling.
tuVfMn	AFLOW_GEZ	End of subhour	min flow (cfm actual air); if no setpoints given, this is "specified output". hourly, dlf 0.
tuVfMn_As	AFLOW_GEZ	Start of phase	.. as autoSized (for constant volume), less variable, for probing.
tuVfMn_AsNov	AFLOW_GEZ	Start of phase	.. raw autoSized value before oversize added, for possible probes. cnausz.cpp code ASSUMES x, x_As, x_AsNov together for access thru one ptr. cuprobe.cpp's name search also requires together. if none of [tuTH][tuth]/[tuTC][tutc]/[tuVfMn][tuvfmn] given, rest of air heat/cool variables are disallowed.

Name	Type	Variability	Description/Comments
ai	TI	input time	0 or AH ss (subscript) for air handler serving tu (input as air handler name). RQD if sp or Mn given.

Name	Type	Variability	Description/Comments
tuVfMxH	AFLOW_GEZ	End of subhour	*s *e cuz autoSize changes it... inputtable hourly. 7-20-95. heating max flow (cfm actual air) b4 ah limits, hourly, RQD if TuTH given else disallowed
tuVfMxH_As	AFLOW_GEZ	Start of phase	.. as determined by autoSizing, less variable, for probing.
tuVfMxH_AsNov	AFLOW_GEZ	Start of phase	.. raw autoSizing result before oversize added, for report/probes. cnausz.cpp code ASSUMES x, x_As, x_AsNov together for access thru one ptr. cuprobe.cpp's name search also requires together.
tuVfMxC	AFLOW_GEZ	End of subhour	cooling max flow (cfm actual air) b4 ah limits, hourly, RQD if TuTC given else disallowed
tuVfMxC_As	AFLOW_GEZ	Start of phase	.. as determined by autoSizing, less variable, for probing.
tuVfMxC_AsNov	AFLOW_GEZ	Start of phase	.. raw autoSizing result before oversize added, for report/probes. cnausz.cpp code ASSUMES x, x_As, x_AsNov together for access thru one ptr. cuprobe.cpp's name search also requires together.

Name	Type	Variability	Description/Comments
tuVfDs	AFLOW_GZ	Start of run	design flow (cfm actual air), constant, to apportion flow when ah fan overloads. default larger of [tuVfMxH][tuvfmxh], [tuVfMxC][tuvfmxc], [tuVfMn][tuvfmn], or RQD if vbl expr given for any of those and [tuTH][tuth], [tuTC][tutc], or [tuVfMn][tuvfmn] given.

Name	Type	Variability	Description/Comments
tuPriH	SI_GZ	Start of phase	heat setpoint priority: lowest # used first when equal setpoints in zone. const. default: 1.
tuPriC	SI_GZ	Start of phase	cool likewise. ... RQD if corress sp given, else disallowed.

Name	Type	Variability	Description/Comments
tuSRLeak	number	Start of phase	leakage 0-.5 of supply air to return, increasing supply vol and return temp. constant; dfl .05. note this is fraction of current cfm, whereas ah leak (before VAV dampers) is fraction max cfm. add [tfanOffLeak][tfanoffleak] to this if terminal has fan that is not running.

Name	Type	Variability	Description/Comments
tuSRLoss	number	Start of run	supply air to return plenum heat loss as a fraction 0 - .5 of supply air to return air temperature difference, constant, default .1. Not allowed if return is ducted.

Name	Type	Variability	Description/Comments
tfanSch	TFANSCHVC	Start of run	terminal fan schedule, choice of OFF, ON, HEATING, or VAV, hourly, RQD if [tfanType][tfantype] not NONE. HEATING: fan ON if local heat output is non-0 VAV: fan ON if central fan ON or doing setback/setup heat and ssCtrl is ZONE_HEAT or BOTH. series fan runs whenever ON. parallel fan runs enough to keep terminal cfm at terminal minimum + fan cfm -- makes up any shortage in air thru damper. Code as though variable speed (tho usually cycles). example (rob's) of need for variability: central system cools in daytime but does setback heat at night: tfanSch might be HEATING in daytime and VAV at night.

Name	Type	Variability	Description/Comments
tfanOffLeak	number	Start of run	backdraft leakage when fan off, 0 to .25 of tfanVfDs, constant, dfl .1, or 0 if no fan.

Name	Type	Variability	Description/Comments
tfan			terminal fan FAN subrecord. If tfan.fanType is NONE, other tfan inputs disallowed. the following terminal inputs are in tfan: FANTYCH [tfanType][tfantype] // NONE (default), SERIES, or PARALLEL. constant. Fan source is return air. // parallel: fan runs when VAV flow low; tfan cfm is added to VAV cfm to get zone cfm. // series always runs; if VAV cfm < tfan cfm, rest comes from RA. AFLOW_GZ [tfanVfDs][tfanvfds] // terminal fan design flow (cfm actual air), RQD if fan present. // or default to terminal heat design flow? ?? PRESAIR_GZ [tfanPress][tfanpress] // tu fan external static pressure, .05 to 1.0 "H2O, constant, default .3. FRAC [tfanEff][tfaneff] // tu fan/motor/drive combinded efficiency, constant, default .08. .08!? MTR tfanMtri // MTR to which energy use is charged 4-11-92 PYCUBIC2 tfanCurvePy // part-load energy consumption curve coefficients 6-92, default linear // other fan subrecord members for terminal fan are internally set as follows: // vfMxF: 1.0; motPos: INFLO; shaftPwr: default from eff; // motEff: 1.0: needn't differentiate fan eff from motEff under INFLO.
FAN Name Type Variability Description/Comments tfan.fanTy choice:FANTY Start of phase fan position choice, according to application as follows; constant. air handler supply: DRAWTHRU (default) or BLOWTHRU ah return/relief: NONE (default), RETURN, or RELIEF terminal: NONE (default), SERIES, or PARALLEL zone exhaust fan: NONE or EXHAUST (no types, just whether exists) AirNet ([IZXFER][izxfer]): ditto tfan.vfDs AFLOW_GZ End of subhour design volumetric flow (cfm actual air). constant, RQD except as noted. *s cuz varies when autoSizing. tfan.vfDs_As AFLOW Start of phase autoSized ditto for ah sfan and rfan for naming consistency. 6-95. tfan.vfDs_AsNov AFLOW Start of phase raw autoSized ditto b4 overSize added, for report/probes. 7-95. cnausz.cpp code ASSUMES x, x_As, x_AsNov together for access thru one ptr. cuprobe.cpp's name search also requires together. tfan.vfMxF number Start of phase factor by which fan flow will exceed vfDs (at reduced pressure). default 1.3. constant. Error if < 1.0; typically <= 1.5. Name Type Variability Description/Comments tfan.press PRESAIR_GEZ Start of run system design pressure, "H2O (inches of water), constant, used in defaulting power / efficiency. default: supply 3, r/r .75, tu .3, zx ???. 0 allowed 5-1-92 to eliminate fan heat for test/calibration purposes. only one of eff and shaftPwr may be given: Name Type Variability Description/Comments tfan.eff FRAC_GZ Start of run fan (hydraulic) efficiency at vfDs and press (any temp), constant, default from power if given, else .65. (1-eff) of fan shaft power is converted to heat in airstream. tfan.shaftPwr BHP_GZ Start of run fan shaft power at vfDs and press (any temp). constant. default: from eff Btuh internally, entered in BHP (user name 'shaftBhp') (cvpak converts). ^^^^make user name 'shaftBhp'. field type name?? tfan.elecPwr FLOAT_GZ Start of run motor input power, W/cfm (based on vfDs); shaftPwr and elecPwr cannot both be input Name Type Variability Description/Comments tfan.motTy choice:MOTTY Start of run motor type (C_MOTTYCH_PSC or C_MOTTYCH_BPM) [RSYS][rsys] only minimal use 4-12, could effect defaults Name Type Variability Description/Comments tfan.motEff FRAC_GZ Start of phase motor/drive efficiency, constant, default .9. Name Type Variability Description/Comments tfan.motPos choice:MOTPOS Start of phase motor/drive position: choice of INFLO (default), INRETURN, EXTERNAL. constant. INRETURN is for supply fans only and will be deferred/omitted if difficult chip per taylor 3-4-92). Name Type Variability Description/Comments tfan.curvePy fan part-load energy consumption curve cubic polynomial coefficients with x0 PYCUBIC2 Name Type Variability Description/Comments tfan.curvePy.k[index] number Array [6] Start of phase FLOAT k[6]. [0..3] are coeff, [4] is minimum x, [5] is terminator needed by cul.cpp. Name Type Variability Description/Comments tfan.mtri TI input time subscript of meter (MTR) to which energy consumption is charged tfan.endUse choice:ENDUSE Start of phase end use to which energy consumption is charged not used for all fans (many implicitly default to "fan") Name Type Variability Description/Comments tfan.ausz BOO Start of run non-0 if fan being autoSized (AH sfan, rfan): input contained [AUTOSIZE][autosize] _fanVfDs. 7-1-95. see also AH::fanAs, asRfan, asFlow. 7-1-95. */ FAN setup time members, set by cnfan.cpp:FAN::setup. May be resetup during autoSize run. also cMx may be init by setup, to be non-0. Name Type Variability Description/Comments tfan.outPower number Start of subhour motor output power (work done by fan), member 7-95 for one setup check in cncult5.cpp inPower = shaftPwr/motEff is computed as needed. tfan.airPower number Start of subhour fan heat to air (Btuh) at vfDs (& pressure): work done by fan, plus motor/drive inefficiency if in flow. Note work done by fan is modelled as HEAT ADDED TO AIR AT FAN per Chip/Niles (3-92, undocumented) heat to air around motor (in return air etc) at design flow is: (inPower - airPower). this is 0 if motor in air flow. FAN runtime members, set by cnah.cpp:FAN::pute( cFlow, temp) Name Type Variability Description/Comments tfan.cMx CFLOW End of subhour max heat cap flow (Btuh/F) at curr air temp & run press & ref w: .vfMx * air vsh * 60 (min/hr) tfan.c CFLOW End of subhour current average flow in heat cap units (Btuh/F): input saved for probing by last call to FAN::pute() tfan.t TEMP End of subhour current air temp, input saved ditto, used in converting BtuF/F to cfm tfan.frOn number End of subhour fraction of time fan is on, saved input made local to pute()to save members 10-92: *s *e FRAC relFlow // fraction of design flow *s *e FRAC relLoad // fraction of full load per part load curve for fan type (1.0 if over design flow: assume pressure drops) tfan.p number End of subhour (motor) power consumption for subhour -- inPower * relLoad. *subhrDur for meter. tfan.q number End of subhour heat (power) to air this subhour: airPower * relLoad. Member needed in addition to c and dT?? tfan.dT TEMPDIFF End of subhour temp difference due to fan: q/c tfan.qAround number End of subhour heat to air around motor, if not in air flow, for use re supply fan motor in return air

TERMINAL SETUP TIME variables

Name	Type	Variability	Description/Comments
nxTu4z	TI	Start of run	chain: 0 or ss (subscript) of next TU in zone chain. head is ZNR.tu1.
nxTu4a	TI	Start of run	chain: 0 or ss (subscript) of next TU in air handler chain. head is AH.tu1.

Name	Type	Variability	Description/Comments
xiLh	TI	Start of run	subscript of ZHX for terminal's local heat capability
xiArH	TI	Start of run	ss of ZHX for cmSo air heat/cool or cmStH air heat capability
xiArC	TI	Start of run	ss of ZHX for tu's cmStC air cool, if any

terminal capability existence / ctrl method flags, inferred from inputs:

Name	Type	Variability	Description/Comments
cmLh	TCCM	Start of run	local heat: cmNONE=0; cmStxx: tstat-controlled (setpoint given); or cmSo (only output/flow given).
cmAr	TCCM	Start of run	air heat and cool: cmNONE=0,cmSo=1,cmStH=2,cmStC=4,cmStBOTH=6.

TERMINAL RUNTIME variables for ZN/ZN2 control method interaction with air handler

Name	Type	Variability	Description/Comments
ctrlsAi	TI	Start of run	ss of ah ctrl'd by this tu under ZN/ZN2 control method, this hour (setup time). CAUTION: verify ah->ahTsSp==ZN or ZN2 -- may vary.
wantMd	AHMODE	End of subhour	terminal request to ctrl'd ah: HEATING, COOLING, OFF. set in TU::estimate, ztuCompute, AH::wzczxxxx.

terminal runtime variables -- mostly inputs to terminal code

Name	Type	Variability	Description/Comments
lhMn	DBL	End of subhour	POWER min local Q this subhour: [tuQMnLh][tuqmnlh], adjusted for plant capacity (reduced if overloaded) (Btuh)
lhMx	DBL	End of subhour	POWER local heat maximum Q this subhour: [tuQMxLh][tuqmxlh] adjusted for plant capacity (Btuh)
lhMxMx	DBL	End of subhour	POWER max lhMx re autoSizing user input problem diagnosis in cnztu.cpp cMn,cMxH,cMxC are [tuVfMn][tuvfmn],-MxH,-C conv'd to heat cap flow rate @ curr temp/press & adjusted for current ah capacity (fanF).
cMn	DBL	End of subhour	CFLOW specified or min or autoSized air flow this subhour (Btuh/F)
cMxH	DBL	End of subhour	CFLOW air heat (cmStH) max flow this subhour (Btuh/F)
cMxC	DBL	End of subhour	CFLOW air cool (cmStC) max flow this subhour (Btuh/F)

terminal runtime variables set within terminal code

Name	Type	Variability	Description/Comments
useLh	TCUSE	End of subhour	local heat use this subhour: uNONE(0)/uSo/uMn/uStH/uMxH.
useAr	TCUSE	End of subhour	air cool/heat use this subhour, same plus uStC/uMxC.
qLhWant	DBL	End of subhour	POWER desired local heat: value > tuhc.q invokes plant off check in tuEndSubhr, 9-25-92.

• terminal runtime variables -- OUTPUTS of terminal module, and some AH working storage
• actual local heat output (Btuh) (former .qLh, 9-92) is in tuhc.q, 0 if required plant off or flow not present.

Name	Type	Variability	Description/Comments
cv	DBL	End of subhour	CFLOW actual heat cap flow rate at vav damper, current subHr (Btuh/F), official ztuCompute copy.
cz	DBL	End of subhour	CFLOW zone heat cap flow rate, current subHr (Btuh/F): cv less leaks. for probing.
aCv	DBL	End of subhour	CFLOW working copy of cv for air handlers to use/modify then possibly abandon ah working cz: is computed by function aCz() (above) as required

terminal fan runtime variables

Name	Type	Variability	Description/Comments
tfanRunning	BOO	End of subhour	TRUE if terminal fan running this subhour (no backflow). ztuCompute(?) must set when tfan implemented. NO CODE YET SETS THIS TRUE as of 5-92.
tfanBkC	DBL	End of subhour	CFLOW terminal fan backflow (supply air to return or plenum) when fan not running: tfan.vfDs*[tfanOffLeak][tfanoffleak], converted to heat cap units @ current supply temp. 0 if no terminal fan; user must use 0 if tfanRunning. set by AIR HANDLER in AH:ahVshNLims, 5-92.