# APPENDIX 7A. INTERNAL LOADS SCHEDULES AND PART-LOAD

PERFORMANCE CURVES

LIST OF TABLES

Table 7A.1 Occupancy, Lighting and Plug Loads Schedules..................................... 7A-1

Table 7A.2 CAC and CHP Performance Curves Us ed in Small Office Modeling..... 7A-2

7A-i

# 7A-1APPENDIX 7A. INTERNAL LOADS SCHEDULES AND PART-LOAD PERFORMANCE CURVESTable 7A.1. Occupancy, Lighting and Plug Loads SchedulesScheduleDay ofWeek123456789101112131415161718192021222324Lighting(1.0 W/sf)Weekday0.180.180.180.180.180.230.230.420.900.900.900.900.800.900.900.900.900.610.420.420.320.320.230.18Sat0.180.180.180.180.180.180.180.180.180.180.180.180.180.180.180.180.180.180.180.180.180.180.180.18Sun, Hol,Other0.180.180.180.180.180.180.180.180.180.180.180.180.180.180.180.180.180.180.180.180.180.180.180.18PlugEquipment(0.63W/sf)Weekday0.200.200.200.200.200.200.200.501.001.001.001.000.941.001.001.001.000.500.200.200.200.200.200.20Sat0.200.200.200.200.200.200.200.200.200.200.200.200.200.200.200.200.200.200.200.200.200.200.200.20Sun, Hol,Other0.200.200.200.200.200.200.200.200.200.200.200.200.200.200.200.200.200.200.200.200.200.200.200.20OccupancyWeekday0.000.000.000.000.000.000.110.211.001.001.001.000.531.001.001.001.000.320.110.110.110.110.050.00Sat0.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.00Sun, Hol,Other0.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.00HeatingSetpointWeekday60.060.060.060.060.060.065.070.070.070.070.070.070.070.070.070.070.070.070.060.060.060.060.060.0Sat60.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.0Sun, Hol,Other60.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.0CoolingSetpointWeekday,85.085.085.085.085.085.080.075.075.075.075.075.075.075.075.075.075.075.075.085.085.085.085.085.0Sat85.085.085.085.085.085.085.085.085.085.085.085.085.085.085.085.085.085.085.085.085.085.085.085.0Sun, Hol,Other85.085.085.085.085.085.085.085.085.085.085.085.085.085.085.085.085.085.085.085.085.085.085.085.0FanOperationandVentilationWeekday,0.00.00.00.00.00.01.01.01.01.01.01.01.01.01.01.01.01.01.00.00.00.00.00.0Sat0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0Sun, Hol,Other0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0InfiltrationWeekday,1.001.001.001.001.001.000.250.250.250.250.250.250.250.250.250.250.250.250.251.001.001.001.001.00Sat,1.001.001.001.001.001.001.001.001.001.001.001.001.001.001.001.001.001.001.001.001.001.001.001.00Sun, Hol,Other1.001.001.001.001.001.001.001.001.001.001.001.001.001.001.001.001.001.001.001.001.001.001.001.00Hot WaterWeekday,0.000.000.000.000.000.000.000.270.550.640.640.821.000.910.550.550.730.370.370.180.270.090.000.00Sat,0.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.00Sun, Hol,Other0.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.00Table 7A.2. CAC and CHP Performance Curves Used in Small Office ModelingTypePerformanceCurveEquation CurveCoefficientsabcdefCACTotal Cooling Capacity Function of Temperature CurveEDBWBfEDBeEDBdWBcWBbaFTCAPCOOL××+×+×+×+×+=−−221.186036-0.067990.003167-0.009023.91E-05-0.00064Total Cooling Capacity Function of Flow Fraction CurveFF2cFFbaFFCAPCOOL×+×+=−−0.637510.409767-0.12055NANANAEnergy Input Ratio Function of Temperature CurveEDBWBfEDBeEDBdWBcWBbaFTEIRCOOL××+×+×+×+×+=−−22-0.438910.145182-0.00394-0.020640.001119-0.00078Energy Input Ratio Function of Flow Fraction CurveFF2cFFbaFFEIRCOOL×+×+=−−1.54819-0.498320.204972NANANACooling Part Load Fraction Correlation CurvePLR2cPLRbaPLREIRCOOL×+×+=−−0.7710.2290.0NANANAPTHPHeating Capacity Function of Temperature CurveDB2cDBbaFTCAPHEAT×+×+=−−0.6915490.0313040.000501NANANAHeating Capacity Function of Flow Fraction CurveDB2cDBbaFFCAPHEAT×+×+=−−1.014278-0.163650.149368NANANAHeating Energy Input Ratio Function of Temperature Curve32DBcDBcDBbaFTEIRHEAT×+×+×+=−−0.8292040.0006970.000779-0.003200.001721-0.00181Heating Energy Input Ratio Function of Flow Fraction CurveFF2cFFbaFFEIRHEAT×+×+=−−1.40347-0.510170.106692NANANAHeating Part Load Fraction Correlation CurvePLR2cPLRbaFPLREIRHEAT×+×+=−−0.7710.2290.0NANANA



# 7A-2

# Where:

COOL

− CAP

− FT 

# = Total Cooling Capacity Function of Temperature,

COOL

− CAP

− FF 

# = Total Cooling Capacity Function of Flow Fraction Curve,

COOL

− EIR

− FT 

# = Energy Input Ratio Function of Temperature,

COOL

− EIR

− FF 

# = Energy Input Ratio Function of Flow Fraction,

COOL

− EIR

− FPLR 

# = Total Cooling Part Load Fraction Correlation Curve Name,

HEAT

− CAP

− FT 

# = Heating Capacity Function of Temperature Curve Name,

HEAT

− CAP

− FF 

# = Heating Capacity Function of Flow Fraction Curve Name,

H

EA T

− E IR

− FT 

# = Heating Energy Input Ratio Function of Temperature Curve Name,

H

EA T

− E IR

− F F 

# = Heating Energy Input Ratio Function of Flow Fraction Curve

Name,

H

EA T

− E IR

− F PLR 

# = Heating Part Load Fraction Correlation Curve Name,

WB = entering coil wet-bulb temperature (° F),

DB = outside dry-bulb temperature (° F),

EDB = entering coil dry-bulb temperature (° F), and

PLR = Part Load Ratio (cooling load/steady-state capacity).

Normalized performance curves for the CA C and CHP condensing un its were developed

based on manufacturers catalog data for Carrier CAC (50ES036) for cooling performance and

Carrier CHP (50VT036) equipment for heating performance. 1,2 

# Equations are in formats

accepted for use in the EnergyPlus simulation t ool input files (*. idf) files for each simulation

run. Part load fraction correlation curves were based on commercial performance data used in the

DOE Benchmark model for cooling part-load pe rformance degradation. Nomenclature used for

left hand side of each performance curve equation based on DOE2.1E descriptors for these

parameters and is not normally found in the EnergyPlus documentation.

1 

# Carrier performance data for CAC. (Last accessed April 2009.)

http://www.docs.hvacpartners.com/idc/groups/public/documents/techlit/50es-02pd.pdf

2 

# Carrier performance data for CAC. (Last accessed April 2009.)

http://www.docs.hvacpartners.com/idc/groups/public/documents/techlit/50vt-01pd.pdf

7A-3