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Cooling Load Calculator

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Input Parameters

Unit System

Additional calculation parameters

CSV Data Import/Export

Includes hourly profiles, temperature sensitivity, and parameter variations

Calculation Results

Total Cooling Load

75,033
Sensible BTU/hr
15,547
Latent BTU/hr
90,580
Total BTU/hr

Load Breakdown

Transmission Load29,800 BTU/hr
Wall Transmission4,800 BTU/hr
Roof Transmission6,000 BTU/hr
Floor Transmission15,000 BTU/hr
Window Transmission4,000 BTU/hr
Solar Heat Gain21,000 BTU/hr
Infiltration Load8,059 BTU/hr
Sensible2,160 BTU/hr
Latent5,899 BTU/hr
Ventilation Load12,088 BTU/hr
Sensible3,240 BTU/hr
Latent8,848 BTU/hr
Occupant Load1,720 BTU/hr
Sensible920 BTU/hr
Latent800 BTU/hr
Lighting Load7,677 BTU/hr
Equipment Load10,236 BTU/hr

System Sizing

Required Capacity: 7.5 tons
(90,580 BTU/hr)

Load Breakdown

Sensible vs Latent Load

Sensible vs Latent Breakdown

Load Distribution

Load Density Comparison

Percentage Contribution

Detailed Analysis & Recommendations

Load Density Analysis

Total Load Density:60.39 BTU/hr/sq ft
Sensible Load Density:50.02 BTU/hr/sq ft
Latent Load Density:10.36 BTU/hr/sq ft

System Recommendations

• Commercial packaged unit recommended

Performance Metrics

83%
Sensible Heat Ratio
60.39
Load Factor (BTU/hr/sq ft)
430
BTU/hr/Person
5.12
Lighting Density (BTU/hr/sq ft)
6.82
Equipment Density (BTU/hr/sq ft)
19.87
Transmission Density (BTU/hr/sq ft)

Load Analysis

Largest Load Component
Transmission
32.9% of total load
Latent Load Ratio
17.2%
Normal range
System Efficiency Factor
3.02
BTU/hr/sq ft/°F

Cooling Load Calculation Steps

1

Calculate Temperature Difference

Formula:
ΔT=Toutdoor−Tindoor\Delta T = T_{outdoor} - T_{indoor}
Calculation:
ΔT=95−75\Delta T = 95 - 75
Result:
20 °F20 \text{ °F}
2

Calculate Wall Transmission Load

Formula:
Qwall=Awall×Uwall×ΔTQ_{wall} = A_{wall} \times U_{wall} \times \Delta T
Calculation:
Qwall=800×0.3×20.0Q_{wall} = 800 \times 0.3 \times 20.0
Result:
4800 BTU/hr4800 \text{ BTU/hr}
3

Calculate Roof Transmission Load

Formula:
Qroof=Aroof×Uroof×ΔTQ_{roof} = A_{roof} \times U_{roof} \times \Delta T
Calculation:
Qroof=1500×0.2×20.0Q_{roof} = 1500 \times 0.2 \times 20.0
Result:
6000 BTU/hr6000 \text{ BTU/hr}
4

Calculate Floor Transmission Load

Formula:
Qfloor=Afloor×Ufloor×ΔTQ_{floor} = A_{floor} \times U_{floor} \times \Delta T
Calculation:
Qfloor=1500×0.5×20Q_{floor} = 1500 \times 0.5 \times 20
Result:
15000 BTU/hr15000 \text{ BTU/hr}
5

Calculate Window Transmission Load

Formula:
Qwindow,trans=Awindow×Uwindow×ΔTQ_{window,trans} = A_{window} \times U_{window} \times \Delta T
Calculation:
Qwindow,trans=200×1×20Q_{window,trans} = 200 \times 1 \times 20
Result:
4000 BTU/hr4000 \text{ BTU/hr}
6

Calculate Total Transmission Load

Formula:
Qtransmission=Qwall+Qroof+Qfloor+QwindowQ_{transmission} = Q_{wall} + Q_{roof} + Q_{floor} + Q_{window}
Calculation:
Qtransmission=4800+6000+15000+4000Q_{transmission} = 4800 + 6000 + 15000 + 4000
Result:
29800 BTU/hr29800 \text{ BTU/hr}
7

Calculate Solar Heat Gain

Formula:
Qsolar=Awindow×Isolar×SHGC×SC×ForientationQ_{solar} = A_{window} \times I_{solar} \times SHGC \times SC \times F_{orientation}
Calculation:
Qsolar=200×250×0.42×1.00Q_{solar} = 200 \times 250 \times 0.42 \times 1.00
Result:
21000 BTU/hr21000 \text{ BTU/hr}
8

Calculate Infiltration Load (Sensible)

Formula:
Qinf,sensible=ACHadjusted×V×ΔT×0.018Q_{inf,sensible} = ACH_{adjusted} \times V \times \Delta T \times 0.018
Calculation:
Qinf,sensible=0.50×12000×20×0.018Q_{inf,sensible} = 0.50 \times 12000 \times 20 \times 0.018
Result:
2160 BTU/hr2160 \text{ BTU/hr}
9

Calculate Infiltration Load (Latent)

Formula:
Qinf,latent=ρ hfg×V˙×ΔWQ_{inf,latent} = \rho\, h_{fg} \times \dot{V} \times \Delta W
Calculation:
ΔW=12.19 g/kg, Qinf,latent=4840×100.0000×0.01219\Delta W = 12.19\text{ g/kg},\ Q_{inf,latent} = 4840 \times 100.0000 \times 0.01219
Result:
5899 BTU/hr5899 \text{ BTU/hr}
10

Calculate Ventilation Load (Sensible)

Formula:
Qvent,sensible=1.08×CFM×ΔTQ_{vent,sensible} = 1.08 \times CFM \times \Delta T
Calculation:
Qvent,sensible=1.08×150×20.0Q_{vent,sensible} = 1.08 \times 150 \times 20.0
Result:
3240 BTU/hr3240 \text{ BTU/hr}
11

Calculate Ventilation Load (Latent)

Formula:
Qvent,latent=ρ hfg×V˙×ΔWQ_{vent,latent} = \rho\, h_{fg} \times \dot{V} \times \Delta W
Calculation:
ΔW=12.19 g/kg, Qvent,latent=4840×150.0000×0.01219\Delta W = 12.19\text{ g/kg},\ Q_{vent,latent} = 4840 \times 150.0000 \times 0.01219
Result:
8848 BTU/hr8848 \text{ BTU/hr}
12

Calculate Occupant Load

Formula:
Qoccupants=Npeople×(Qsensible+Qlatent)Q_{occupants} = N_{people} \times (Q_{sensible} + Q_{latent})
Calculation:
Qoccupants=4×(230+200)Q_{occupants} = 4 \times (230 + 200)
Result:
1720 BTU/hr1720 \text{ BTU/hr}
13

Calculate Lighting Load

Formula:
Qlighting=Wlighting×A×3.412Q_{lighting} = W_{lighting} \times A \times 3.412
Calculation:
Qlighting=1.5×1500×3.412Q_{lighting} = 1.5 \times 1500 \times 3.412
Result:
7677 BTU/hr7677 \text{ BTU/hr}
14

Calculate Equipment Load

Formula:
Qequipment=Wequipment×A×3.412Q_{equipment} = W_{equipment} \times A \times 3.412
Calculation:
Qequipment=2×1500×3.412Q_{equipment} = 2 \times 1500 \times 3.412
Result:
10236 BTU/hr10236 \text{ BTU/hr}
15

Calculate Total Cooling Load

Formula:
Qtotal=Qsensible+QlatentQ_{total} = Q_{sensible} + Q_{latent}
Calculation:
Qtotal=75033+15547Q_{total} = 75033 + 15547
Result:
90580 BTU/hr90580 \text{ BTU/hr}