3.7.5.2 Direct Expansion

90.1-2016 BM

Direct Expansion Cooling Efficiency (COP)

Applicability

Packaged DX equipment

Definition

The cooling efficiency of a direct expansion (DX) cooling system at ARI rated conditions as a ratio of output over input in Btu/h per W, excluding fan energy. Fan energy shall be modeled separately according to Section 3.7.3 of this document.

For all unitary and applied equipment where the fan energy is part of the equipment efficiency rating, the equipment COP shall be calculated as follows:

For EER equipment ratings

(Equation 3.7.5.2-1)

$$COP_{nfcooling} = 7.84\times 10^{-8} \cdot EER \cdot Q + 0.338 \cdot EER$$

For SEER equipment ratings

(Equation 3.7.5.2-2)

$$COP_{nfcooling} = -0.0076 \cdot SEER^{2} + 0.3796 \cdot SEER$$

where

COPnfcooling

Packaged equipment cooling efficiency without the fan

Q

the AHRI-rated cooling capacity in Btu/h

EER, SEER

The energy efficiency ratio or seasonal energy efficiency ratio determined at AHRI test conditions, including the fan.

Units

Unitless ratio

Input Restrictions

As designed. Specify the COPnf as described above based on SEER for packaged equipment with net cooling capacity less than 65,000 Btu/h from manufacturer’s literature. For equipment with capacity above 65,000 Btu/h, use EER.

Baseline Rules

Calculate COPnfcooling using the EER or SEER from the table below:

Equipment Capacity

Rated Efficiency

Test Procedure

<65,000 Btu/h

9.7 SEER

ARI 210/240

≥65,000 Btu/h and <135,000 Btu/h

9.9 EER

ARI 340/360

≥135,000 Btu/h and <240,000 Btu/h

9.1 EER

>240,000 Btu/h

8.8 EER

 

Direct Expansion Cooling Efficiency Adjustment Curve

Applicability

Packaged DX equipment

Definition

A curve that varies the cooling efficiency of a direct expansion (DX) coil as a function of evaporator conditions, condenser conditions, and for small packaged equipment, part-load ratio.

 (Equation 3.7.5.2-3)

$$PLR = \frac{Q_{operating}}{Q_{available(t_{wb},t_{odb/wt})}}$$

(Equation 3.7.5.2-4)

$$EIR\_FPLR=a+b\cdot PLR+c\cdot PLR^{2} +d \cdot PLR^{3}$$

 

For air-cooled DX systems

 (Equation 3.7.5.2-5)

$$EIR\_FT = a + b\cdot t_{wb}+c\cdot t_{wb}^{2}+d\cdot t_{odb}+e\cdot t_{odb}^{2}+f\cdot t_{wb}\cdot t_{odb}$$

For water-cooled DX systems

 (Equation 3.7.5.2-6)

$$EIR\_FT = a + b\cdot t_{wb}+c\cdot t_{wb}^{2}+d\cdot t_{wt}+e\cdot t_{wt}^{2}+f\cdot t_{wb}\cdot t_{wt}$$

 (Equation 3.7.5.2-7)

$$P_{operating}=P_{rated}\cdot EIR\_FPLR\cdot EIR\_FT\cdot CAP\_FT$$

Where

PLR

Part load ratio based on available capacity (not rated capacity)

EIR-FPLR

A multiplier on the rated power draw (Prated) to account for the part load ratio. See the equation above and choose coefficients from Appendix H based on the type of equipment.

EIR-FT

A multiplier on the rated power draw (Prated) to account for the wet-bulb temperature entering the coil and the outdoor dry-bulb temperature. See the equation above and choose coefficients from Appendix H.

Qoperating

Present load on air conditioner (Btu/h)

Qavailable 

Air conditioner available capacity at present evaporator and condenser conditions (in Btu/h).

twb

The entering coil wet-bulb temperature (°F)

twt

The water supply temperature (°F)

todb

The outside-air dry-bulb temperature (°F)

Prated

Rated power draw at ARI conditions (kW)

Poperating

Power draw at specified operating conditions (kW)

Note: if an air-cooled unit employs an evaporative condenser, todb is the effective dry-bulb temperature of the air leaving the evaporative cooling unit.

Units

Data structure

Input Restrictions

User may input curves or use default curves. If defaults are overridden, the software must indicate that supporting documentation is required on the output forms.

Baseline Rules

Use default curves.

 

Number of Cooling Stages

Applicability

DX systems with multiple stages

Definition

This applies to systems with multiple compressors or multiple discrete stages of cooling.  This system is a packaged unit with multiple stages of cooling. Systems with unequally sized compressors may have additional cooling stages.

Units

None (Integer)

Input Restrictions

As Designed

Baseline Rules

All baseline DX system  single stage.

 

Total Cooling Capacity by Stage

Applicability

DX systems with multiple stages

Definition

This provides the total cooling capacity of each cooling stage, at ARI rated conditions. The capacity is expressed as an array, with each entry a fraction of the total rated cooling capacity for the unit.  For example, if the stage cooling capacity is 4 tons (48,000 Btu/h) and the total cooling capacity is 8 tons (96,000 Btu/h), the capacity is expressed as “0.50” for that stage.

Units

Array of fractions

Input Restrictions

As Designed

Baseline Rules

Not Applicable

 

Sensible Cooling Capacity by Stage

Applicability

DX systems with multiple stages

Definition

This provides the sensible cooling capacity of each cooling stage, at ARI rated conditions. The capacity is expressed as an array, with each entry a fraction of the total rated sensible cooling capacity for the unit.  For example, if the stage sensible cooling capacity is 3.5 tons (42,000 Btu/h) and the total sensible cooling capacity is 7 tons (72,000 Btu/h), the capacity is expressed as "0.5" for that stage."

Units

Array of fractions

Input Restrictions

As designed

Baseline Rules

Not applicable

 

Supply Air Temperature Reset by Stage

Applicability

DX systems with multiple stages

Definition

This provides the cooling supply air temperature setpoint deviation from the cooling design supply air temperature, specified in the building descriptor Cooling Supply Air Temperature.

Units

The temperature reset is expressed as an array, with each entry a deviation from the design supply air temperature.  For example, an entry of “5” for a stage would indicate a 5°F reset (for example, 60°F from 55°F).

Input Restrictions

As designed. Array of temperature differences, in degrees F

Baseline Rules

Not Applicable

 

Number of Heating Stages

Applicability

DX systems with multiple stages

Definition

The number of heating stages provided by the system. Multiple stages could be provided via a heat pump or via a multiple-stage gas furnace.

Units

Integer

Input Restrictions

As designed

Baseline Rules

Not Applicable

 

Heating Capacity by Stage

Applicability

DX systems with multiple stages

Definition

This provides the total heating capacity of each heating stage, at ARI rated conditions. The capacity is expressed as an array, with each entry a fraction of the total rated cooling capacity for the unit.  For example, if the stage heating capacity is 48,000 Btu/h and the heating capacity is 96,000 Btu/h, the capacity is expressed as “0.50” for that stage.

Units

Array of fractions

Input Restrictions

As Designed

Baseline Rules

Not Applicable.

 

Heating Supply Air Temperature by Stage

Applicability

DX systems with multiple stages

Definition

This provides the heating supply air temperature setpoint deviation from the design heating supply air temperature, specified in the building descriptor Cooling Heating Supply Air Temperature.

Units

The temperature reset is expressed as an array, with each entry a deviation from the design supply air temperature.  For example, an entry of “-10” for a stage would indicate a 10°F reset (for example, 95°F from 105°F).

Input Restrictions

As Designed. Array of temperature differences, in degrees F

Baseline Rules

Not Applicable

 

Supply Fan Low Speed Ratio

Applicability

DX systems with multiple stages and two-speed fans

Definition

This specifies the low fan speed setting on a Single Zone VAV system or DX system with multiple cooling stages.

Units

None (fraction)

Input Restrictions

As Designed

Baseline Rules

Not Applicable.

 

Supply Fan Low Power Ratio

Applicability

DX systems with multiple stages and two-speed fans

Definition

This specifies the fraction of full load fan power corresponding to low fan speed operation on a Single Zone VAV system or DX system with multiple cooling stages.

Units

None (fraction)

Input Restrictions

As Designed

Baseline Rules

Not Applicable.

 

Piping Insulation

Applicability

All projects

Definition

Thermal insulation on piping systems for service hot water, steam piping, chilled water for cooling and hot water for space heating.

Units

List (see above)

Input Restrictions

Not modeled

Baseline Rules

Not modeled

 

Minimum Unloading Ratio

Applicability

Packaged systems which use hot-gas bypass during low load conditions

Definition

The upper end of the hot-gas bypass operating range. This is the percentage of peak cooling capacity below which hot-gas bypass will operate.

Units

Ratio

Input Restrictions

As designed. The user must enter this descriptor for each DX cooling system. If hot-gas bypass is not employed, a value of 0 may be entered. A maximum of 0.5 is allowed for units with a peak cooling capacity of 240 kBtu/h (20 tons) or less, and a maximum value of 0.25 is allowed for units with a peak cooling capacity greater than 240 kBtu/h.

Baseline Rules

No hot-gas bypass

 

Minimum HGB Ratio

Applicability

Packaged systems which use hot-gas bypass during low load conditions

Definition

The lower end of the hot-gas bypass operating range. The percentage of peak cooling capacity below which hot-gas bypass will no longer operate (i.e. the compressor will cycle).

Units

Fraction between 0 and 1

Input Restrictions

As designed. The user must enter this descriptor for each DX cooling system. If hot-gas bypass is not employed, a value of 0 may be entered.

Baseline Rules

Not applicable

 

Condenser Type

Applicability

All direct expansion systems including heat pumps

Definition

The type of condenser for a direct expansion (DX) cooling system. The choices are:

  • Air-cooled
  • Water-cooled
  • Air-cooled with evaporative pre-cooler

Units

List (see above)

Input Restrictions

As designed

Baseline Rules

Baseline HVAC systems 1 through 6 are all air cooled.

 

Condenser Flow Type

Applicability

All direct expansion systems including heat pumps

Definition

Describes water flow control for a water-cooled condenser. The choices are:

  • Fixed Flow
  • Two-position
  • Variable Flow

Units

List (see above)

Input Restrictions

Default to fixed flow. If the variable-flow is selected, the software must indicate that supporting documentation is required on the output forms.

Baseline Rules

Not applicable. Baseline DX systems are always air cooled.

90.1-2019

Direct Expansion Cooling Efficiency

Applicability

Packaged DX equipment

Definition

The cooling efficiency of a DX cooling system at ARI rated conditions as a dimensionless ratio of output over input, excluding fan energy. The abbreviation used for this full-load efficiency is COPnf.cooling.

Fan energy shall be modeled separately according to Section 3.7.3 of this document.

Units

Unitless

Input Restrictions

As designed. Calculated as follows:

COPnf.cooling=Qt.gross.rated  TotalInputPowerW-Wfan   ×3.412 BtuhW

(21)

Where:

Qt.gross.rated    = The AHRI rated total cooling capacity of a packaged unit

Baseline Building

For Baseline Systems 1, 2, 3, 4, 5 and6:

Use the COPnf.cooling from Table 64 (Standard 90.1-2019, Table G3.5.4) packaged terminal air conditioners for System 1 or packaged terminal heat pumps for System 2.Where multiple HVAC zones or residential spaces are combined into a single thermal block, the efficiencies for baseline HVAC Systems shall be taken from Standard 90.1-2019 Tables G3.5.1, G3.5.2, and G3.5.4, and shall be based on the equipment capacity of the thermal block divided by the number of HVAC zones or residential spaces.

Table 64. Efficiency Requirements For Baseline Systems with PTAC and PTHPs (efficiency ratings excluding supply fan power)

Equipment Capacity

Rated Efficiency (EER cooling, COP heating)

PTAC All Capacities (cooling mode)

3.2 COPnfcooling

PTHP All Capacities (cooling mode)

 3.1 COPnfcooling

PTHP All Capacities (heating mode)

 3.1 COPnfheating

For Baseline Systems 3, 4, 5, 6:

Equipment cooling efficiencies for DX coils shall be modeled in accordance to Table 65 and Table 66 (Standard 90.1-2019 Table G3.5.2 for System 4 and Table G3.5.1 for Systems 3, 5 and 6), which specify COPnf.cooling for packaged air conditioners. Baseline HVAC system types 5 or 6 efficiencies taken from Table 65 shall be based on the cooling equipment capacity of a single floor when grouping identical floors.

Table 65. Performance Rating Method Air Conditioners: System 3 (efficiency ratings excluding supply fan power)

Equipment Type

Size Category

Heating Section Type

Subcategory or Rating Condition

Minimum Efficiency

Air conditioners, air cooled

<65,000 Btu/h

All

Single Package

3.0 COPnf.cooling

≥65,000 Btu/h and <135,000 Btu/h

Split-system and single-package

3.5 COPnf.cooling

≥135,000 Btu/h and<240,000 Btu/h

3.4 COPnf.cooling

≥240,000 Btu/h and <760,000 Btu/h

3.5 COPnf.cooling

≥760,000 Btu/h

3.6 COPnf.cooling

 

Table 66. Performance Rating Method Electrically Operated Unitary and Applied Heat Pumps: System 4

Equipment Type

Size Category

Heating Section Type

Subcategory or Rating Condition

Minimum Efficiency

Air-cooled, (cooling mode)

<65,000 Btu/h

All

Single-package

3.0 COPnf.cooling

≥65,000 Btu/h and <135,000 Btu/h

Split-system and single-package

3.4 COPnf.cooling

≥135,000 Btu/h and<240,000 Btu/h

3.2 COPnf.cooling

≥240,000 Btu/h

3.1 COPnf.cooling

Air-Cooled (heating-mode)

<65,000 Btu/h (cooling capacity)

All

Single-package

3.4 COPnfheating

≥65,000 Btu/h and <135,000 Btu/h (cooling capacity)

47°F db/43°F wb outdoor air

3.4 COPnfheating

17°F db/15°F wb outdoor air

2.3 COPnfheating

≥135,000 Btu/h (cooling capacity)

47°F db/43°F wb outdoor air

3.4 COPnfheating

17°F db/15°F wb outdoor air

2.1 COPnfheating

Direct Expansion Cooling Efficiency Temperature Adjustment Curve

Applicability

Packaged DX equipment

Definition

A curve that varies the cooling efficiency of a DX coil as a function of evaporator conditions, condenser conditions. For air cooled DX systems:

EIR_FT=a+b×twb+c×twb2+d×todb+e×todb2+f×twb×todb

            (22)

For water cooled DX systems:

EIR_FT=a+b×twb+c×twb2+d×twt+e×twt2+f×twb×twt

            (23)

 

Poperating=Prated×EIR_FPLR×EIR_FT×CAP_FT

            (24)

Where:

PLR            =       Part load ratio based on available capacity (not rated capacity)

EIR-FT      =       A multiplier on the EIR to account for the wet-bulb temperature entering the coil and the outdoor dry-bulb temperature

Qoperating    =       Present load on heat pump (Btu/h)

Qavailable    =       Heat pump available capacity at present evaporator and condenser conditions (in Btu/h)

twb              =        The entering coil wet-bulb temperature (°F)

twt               =        The water supply temperature (°F)

todb             =        The outside-air dry-bulb temperature (°F)

Prated          =        Rated power draw at ARI conditions (kW)

Poperating    =       Power draw at specified operating conditions (kW)

Note: If an air cooled unit employs an evaporative condenser, todb is the effective dry-bulb temperature of the air leaving the evaporative cooling unit.

Table 67. Cooling System Coefficients for EIR-FT

Coefficient

Water-Source
(Heat Pump)

Water-Source
(Other)

Air-Source (PTAC)

Air-Source (Other)

a

2.0280385

-1.8394760

-0.6550461

-1.0639310

b

-0.0423091

0.0751363

0.0388910

0.0306584

c

0.0003054

-0.0005686

-0.0001925

-0.0001269

d

0.0149672

0.0047090

0.0013046

0.0154213

e

0.0000244

0.0000901

0.0001352

0.0000497

f

-0.0001640

-0.0001218

-0.0002247

-0.0002096

Rated CWT

Max 85°F, Min 60°F

Max 85°F, Min 60°F

NA

NA

Rated EWBT

Max 57°F, Min 77°F

Max 57°F, Min 77°F

Max 77°F, Min 57°F

Max 77°F, Min 57°F

Rated OADBT

NA

NA

Max 115°F, Min 75°F

Max 115°F, Min 75°F

Source: (CEC 2013)

 

Units

Data structure

Input Restrictions

User may input curves or use default curves. If defaults are overridden, the software must indicate that supporting documentation is required on the output forms.

Baseline Building

Use default curves specified above, also documented in COMNET Appendix H (COMNET 2017)

 

Direct Expansion Part-Load Efficiency Adjustment Curve

Applicability

Packaged systems with DX cooling

Definition

A normalized performance adjustment curve to the rated efficiency (energy input ratio [EIR]) that describes how the efficiency varies at part-load conditions. At a value of 1 (full load), the normalized efficiency is 1.

The default curves are given as follows as adjustments to the EIR[1]:

PLR=QoperatingQavailabletwb,todb/wt

 (25)

 

 

EIRFPLR=a+b×PLR+c×PLR2+d×PLR3

 

PLFFPLR=a+b×PLR+c×PLR2 +d×PLR3

 (26)

Where:

PLR              =     Part load ratio based on available capacity (not rated capacity)

EIR-FPLR   =     A multiplier on the EIR to account for the part load ratio

Qoperating      =     Present load on heat pump (Btu/h)

Qavailable      =     Heat pump available capacity at present evaporator and condenser conditions (in Btu/h)

twb               =     The entering coil wet-bulb temperature (°F)

twt                =     The water supply temperature (°F)

todb             =     The outside-air dry-bulb temperature (°F)

This curve may take the form of a part-load factor (PLF) or EIR-FLPR, which is the fraction of time the unit must run to meet the part-load for that hour. For example, at 40% of full load, the equipment might need to run 50% of the hour (for cycling losses).

Note that for small packaged equipment with SEER ratings <65,000 Btu/h, the part-load efficiency curve is set to no degradation, since the part-load degradation is built-into the DX cooling efficiency temperature adjustment curve (Air Source, other)

Default curves are provided for the different major classes of equipment.

Units

Coefficients

Input Restrictions

The coefficients should sum to 1 (within a small tolerance). This corresponds to a curve output of 1 for an input of 1. User may input curves or use default curves. If defaults are overridden, the software must indicate that supporting documentation is required on the output forms.

Baseline Building

The baseline part-load efficiency adjustment curves are shown in the tables below:

Table 68.Cooling System Coefficients for EIR-FPLR

Coefficient

Water-Source
(Heat Pump)

Water-Source
(Other)

Air-Source (PTAC)

Air-Source (PSZ with Cap<65,000 Btu/h)

Air-Source (Other)

a

0.1250000

0.2012301

0.1250000

0

0.2012301

b

0.8750000

-0.0312175

0.8750000

1

-0.0312175

c

0.0000000

1.9504979

0.0000000

0

1.9504979

d

0.0000000

-1.1205105

0.0000000

0

-1.1205105

Table 69. Cooling System Coefficients for Part-Load Factor (PLF) Correlation (EnergyPlus)

Coefficient

Water-Source
(Heat Pump)

Water-Source
(Other)

Air-Source (PTAC)

Air-Source (PSZ with Cap<65,000 Btu/h)

Air-Source (Other)

a

0.85

0

0.85

1

0

b

0.15

5.1091

0.15

0

5.1091

c

0

-8.5515

0

0

-8.5515

d

0

4.4744

0

0

4.4744

Source: (CEC 2013)

 

 

[1] The EIR is the ratio of energy used by the system to cooling capacity in the same units. It is the reciprocal of the coefficient of performance (COP). EnergyPlus uses a part-load factor correlation for PLF as a function of PLR. The EnergyPlus PLF is related to the DOE-2 EIR(PLR) by the following: EIR-FPLR = PLR / PLF.

 

Direct Expansion Number of Cooling Stages

Applicability

DX systems with multiple stages

Definition

This applies to systems with multiple compressors or multiple discrete stages of cooling. This system is a packaged unit with multiple stages of cooling. Systems with unequally sized compressors may have additional cooling stages.

Units

None (integer)

Input Restrictions

As designed

Baseline Building

All baseline DX systems are single stage

 

Total Cooling Capacity by Stage

Applicability

DX systems with multiple stages

Definition

This provides the total cooling capacity of each cooling stage, at ARI rated conditions. The capacity is expressed as an array, with each entry a fraction of the total rated cooling capacity for the unit. For example, if the stage cooling capacity is 4 tons (48,000 Btu/h) and the total cooling capacity is 8 tons (96,000 Btu/h), the capacity is expressed as “0.5” for that stage.

Units

Array of fractions

Input Restrictions

As designed

Baseline Building

Not applicable for baseline systems

 

Sensible Cooling Capacity by Stage

Applicability

DX systems with multiple stages

Definition

Provides the sensible cooling capacity of each cooling stage, at ARI rated conditions. The capacity is expressed as an array, with each entry a fraction of the total rated sensible cooling capacity for the unit. For example, if the stage sensible cooling capacity is 3.5 tons (42,000 Btu/h) and the total sensible cooling capacity is 7 tons (72,000 Btu/h), the capacity is expressed as “0.5” for that stage.

Units

Array of fractions

Input Restrictions

As designed

Baseline Building

Applicable baseline systems 1 through 6. The sensible cooling capacity of the baseline building is oversized by 15%. Sizing calculations shall be based on 1% dry-bulb and 1% wet-bulb design conditions.

 

Supply Fan Low Speed Ratio

Applicability

Single zone DX systems with multiple stages and two-speed fans or VAV fans

Definition

Specifies the low fan speed setting on a single zone VAV system or DX system with multiple cooling stages

Units

None (fraction)

Input Restrictions

As designed

Baseline Building

Not applicable

 

Supply Fan Low Power Ratio

Applicability

Single zone DX systems with multiple stages and two-speed fans or VAV fans

Definition

Specifies the fraction of full load fan power corresponding to low fan speed operation on a single zone VAV system or DX system with multiple cooling stages

Units

None (fraction)

Input Restrictions

As designed

Baseline Building

Not applicable

 

Piping Insulation

Applicability

All projects

Definition

Thermal insulation on piping systems for service hot water, steam piping, chilled water for cooling, and hot water for space heating

Units

List (see above)

Input Restrictions

Not modeled

Baseline Building

Not modeled

 

Minimum Unloading Ratio

Applicability

Packaged systems that use hot-gas bypass during low load conditions

Definition

The minimum unloading ratio is where the equipment capacity can no longer be reduced by unloading and must be false loaded to meet smaller cooling loads. A typical false loading strategy is hot-gas bypass.

The minimum unloading ratio is the upper end of the hot-gas bypass operating range. This is the percentage of peak cooling capacity below the range in which hot-gas bypass will operate.

The actual unloading ratio shall be set to 50% of the user-entered minimum unloading ratio, with hot-gas-bypass operating below this level.

Units

Ratio

Input Restrictions

As designed. The user must enter this descriptor for each DX cooling system. If hot-gas bypass is not employed, a value of 0 may be entered.

Baseline Building

 Not applicable

 

Minimum HGB Ratio

Applicability

Packaged systems that use hot-gas bypass during low load conditions

Definition

The lower end of the hot-gas bypass operating range. The percentage of peak cooling capacity below which hot-gas bypass will no longer operate (i.e., the compressor will cycle).

Units

Fraction (between 0 and 1)

Input Restrictions

As designed. The user must enter this descriptor for each DX cooling system. If hot-gas bypass is not employed, a value of 0 may be entered.

Baseline Building

Not applicable

 

Condenser Type

Applicability

All DX systems including heat pumps

Definition

The type of condenser for a DX cooling system. The choices are:

  • Air-cooled
  • Water-cooled
  • Air-cooled with evaporative pre-cooler

Units

List (see above)

Input Restrictions

As designed

Baseline Building

Based on prescribed system type

Table 70. Baseline Building Condenser Type

Baseline Building System

Condenser Type

1 – PTAC

Air cooled

2 – PTHP

Air cooled

3 – PSZ AC

Air cooled

4 – PSZ HP

Air cooled

5 – PVAV reheat

Air cooled

6 – Packaged VAV with PFP Boxes

Air cooled

7 – VAV with Reheat

N/A

8 – VAV with PFP Boxes

N/A

9 – Heating and Ventilation

N/A

10 – Heating and Ventilation

N/A

11 – Single Zone VAV

N/A

12- Single Zone CAV HW

N/A

13- Single Zone- CAV ER

N/A

 

 

Condenser Flow Type

Applicability

All DX systems including heat pumps

Definition

Describes water flow control for a water cooled condenser. The choices are:

  • Fixed flow
  • Two-position
  • Variable flow

Units

List (see above)

Input Restrictions

As designed. For variable or staged capacity equipment, the minimum-unload ratio must be set properly for the simulation program. NOTE: If the variable-flow is selected, the software must indicate that supporting documentation is required on the output forms.

Baseline Building

Not applicable