# COMMERCIAL HEAT GAIN - HEAT LOSS CALCULATION LOAD FORM

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1 COMMERCIAL HEAT GAIN - HEAT LOSS CALCULATION LOAD FORM Job Name: Address: Phone/Fax/ Contractor: Address: Phone/Fax/ Heat Gain Summary Sensible Heat (Btu/h) Latent Heat (Btu/h) Total Heat Gain (Btu/h) Total (Tons) Heat Loss Summary Total (Btu/h) Forms available from: HRAI * 2800 Skymark Avenue * Building 1* Suite 201 Mississauga, Ontario * L4W 5A6A6 Reproduction in any form by mechanical means is forbidden. Copyright by: The Heating Refrigeration and Air Conditioning Institute of Canada.

2 COMMERCIAL HEAT GAIN CALCULATIONS Page 2 DESIGN CONDITIONS - HEAT GAIN (Cooling Load) Indoor Design Temperature A2 Outdoor Design Temperature D2 Design Grains B2 Daily Range E2 Peak Time of Day C2 Latitude F2 Equation # HG1 --> Outdoor Design Temperature Adjustment (G2) = Daily Range x Factor E2 Factor = x = G2 Equation # HG2 --> Summer Design Temperature (H2) = D2 - G2 - A2 Outdoor Design Temperature D2 Outdoor Design Temperature Adjustment - G2 Indoor Design Temperature - A2 = H2 Equation # HG3 --> Equivalent Temperature Difference (ETD) Correction Factor (K2) Steps a) H2-20 = = I2 b) 0.5 x (20 - E2) = = J2 c) I2 + J2 = = K2

3 COMMERCIAL HEAT GAIN CALCULATIONS Page 3 1. TRANSMISSION HEAT GAIN SENSIBLE LATENT Area x U-value x Temperature Btu/h Btu/h Difference a) Glass N x x = --- E x x = --- W x x = --- S x x = --- b) Net Walls (Exterior) N x x = --- Use ETD E x x = --- W x x = --- S x x = --- c) Doors N x x = --- E x x = --- W x x = --- S x x = --- d) Partitions (Interior) N x x = --- Use Actual E x x = --- Temp. Diff. W x x = --- S x x = e) Floors x x = f1) Roof x x = --- f2) Roof/Ceiling x x = --- f3) RA Ceiling A3 x x = A3 D HEAT GAIN SUB TOTAL PAGE 3 Btu/h D Place These Values on Page 8 SENSIBLE LATENT ---

4 COMMERCIAL HEAT GAIN CALCULATIONS Page 4 2. SOLAR RADIATION HEAT GAIN THROUGH GLASS Glass Type Area x Solar x Shading (W) (D) (O) Factor Factor N x x --- x x --- E x x --- x x --- W x x --- x x --- S x x --- x x INTERNAL HEAT GAINS 3a) Occupants Activity Number x Sensible OR Latent 1) x x --- = --- 2) x x --- = --- 1) x --- x = --- 2) x --- x = --- 3b) Lights Number of x Watts per x Conversion Fixtures Fixture Factor Incandescent x x 3.4 = --- Fluorescent x x 4.1 = --- 3c) Appliances/Motors Usuage Factor x Sensible OR Latent x x --- = --- x x --- = --- x x --- = --- x --- x = --- x --- x = --- x --- x = --- D HEAT GAIN SUB TOTAL PAGE 4 Btu/h D Place These Values on Page 8 SENSIBLE LATENT

5 COMMERCIAL HEAT GAIN CALCULATIONS Page 5 4. INFILTRATION HEAT GAIN 4a) Structural Infiltration 4b) Door Infiltration Volume of Conditioned Space Pressure Condition Peak Time of Day Occupancy Number of Doors A5 C5 F5 H5 Quality of Construction Air Changes/Hour Average Length of Stay Number of Occupants B5 D5 G5 I5 Structrural = AC/hr x Volume of Conditioned Space = Traffic Rate (TR) = # of Occupants x Openings J5 Infiltration 60 min/hr # of Doors x Average Length of Stay D5 x A5 = Summer TR I5 x 2 = J H5 x G5 CFM E5 Door(1) CFM x # of Doors = CFM K5a Door(2) CFM x # of Doors = CFM K5b 4c) Total Infiltration CFM Total Infiltrartion = Structural Infiltration + Door(s) Infiltration = E5 + K5a + K5b = CFM L5

6 COMMERCIAL HEAT GAIN CALCULATIONS Page 6 4d) Infiltration Heat Gain Sensible Loads Total Infiltration x Summer Design Temperature (H2) x 1.1 Exterior = x x 1.1 = --- Sensible Loads Total Infiltration x Actual Temperature Difference (DT) x 1.1 Interior a) = x x 1.1 = --- b) = x x 1.1 = --- Latent Loads Total Infiltration (L5) x Design Grains (B2) x 0.68 Exterior = x x 0.68 = Interior Total Infiltration x Actual DGrains x 0.68 a) = x x 0.68 = --- b) = x x 0.68 = --- D HEAT GAIN SUB TOTAL PAGE 6 Btu/h D Place These Values on Page 8 SENSIBLE LATENT

7 COMMERCIAL HEAT GAIN CALCULATIONS Page 7 5. DUCT HEAT GAIN SENSIBLE HEAT GAIN SUB TOTAL PAGE 3 = Page SENSIBLE HEAT GAIN SUB TOTAL PAGE 4 = Page 4 SENSIBLE HEAT GAIN SUB TOTAL PAGE 6 = Page 6 SENSIBLE SUB TOTAL Pages 3 & 4 & 6 = A7 A7 x Factor 2 Supply Duct Heat Gain = x = --- Return Duct Heat Gain = x = VENTILATION Number of Occupants CFM per Person B7 C7 Occupant CFM B7 x C7 Total CFM = x = CFM D7 Total Exhaust CFM = (From Design Specifications) E7 Determine Total Ventilation Select D7 OR E7 --> Whichever Is The Greatest CFM F7 Sensible Load = Total Ventilation (F7) x Summer Design Temperature (H2) x 1.1 x x 1.1 = --- Latent Load = Total Ventilation (F7) x Design Grains (B2) x 0.68 x x 0.68 = --- D HEAT GAIN SUB TOTAL PAGE 7 Btu/h D Place These Values on Page 8 SENSIBLE LATENT

8 COMMERCIAL HEAT GAIN CALCULATIONS Page 8 7. RETURN AIR PLENUM HEAT GAIN Btu/h Incandescent Lights (Watts) x 3.4 x 0.40 = A8 Flourescent Lights (Watts) x 4.1 x 0.40 = B8 Walls Area x U-Value ETD N) x x = C8 E) x x = D8 W) x x = E8 S) x x = F8 Area x U-Value ETD Roof x x = G8 Sub Total = A8 + B8 + C8 + D8 + E8 + F8 + G8 = H8 H8 - A3 Return Air Plenum Heat Gain = - = --- D HEAT GAIN SUB TOTAL PAGE 8 Btu/h --- SENSIBLE LATENT 8. TOTAL HEAT GAIN SUMMARY SENSIBLE LATENT D HEAT GAIN SUB TOTAL PAGE 3 = D HEAT GAIN SUB TOTAL PAGE 4 = D HEAT GAIN SUB TOTAL PAGE 6 = D HEAT GAIN SUB TOTAL PAGE 7 = D HEAT GAIN SUB TOTAL PAGE 8 = * TOTAL HEAT GAIN (Btu/h) = * Place These Values on Front Cover Page (Page 1)

9 COMMERCIAL HEAT LOSS CALCULATIONS Page 9 Job Name: DESIGN CONDITIONS - HEAT LOSS (Heating Load) Indoor Design Temperature A9 Indoor Design % RH C9 Outdoor Design Temperature B9 Equation # HL1 --> Winter Design Temperature (D8) Indoor Design Temperature A9 Outdoor Design Temperature - B9 Winter Design Temperature D9 TOTAL HEAT LOSS SUMMARY D HEAT LOSS SUB TOTAL PAGE 10 = D HEAT LOSS SUB TOTAL PAGE 12 = D HEAT LOSS SUB TOTAL PAGE 13 = * TOTAL HEAT LOSS (Btu/h) = * Place This Value on Front Cover Page (Page 1) SENSIBLE

10 COMMERCIAL HEAT LOSS CALCULATIONS Page TRANSMISSION HEAT LOSS SENSIBLE Area x U-value x Temperature Btu/h Difference a) Glass N x x = --- E x x = --- W x x = --- S x x = --- b) Net Walls N x x = --- Exterior E x x = --- Use Actual W x x = --- Temp. Diff. S x x = --- c) Doors N x x = --- E x x = --- W x x = --- S x x = --- d) Partitions N x x = --- (Interior) E x x = --- Use Actual W x x = --- Temp. Diff. S x x = --- e) Floors x x = --- f1) Roof x x = --- f2) Roof/Ceiling x x = --- Exposed x U-value x Temperature g) Slab Floors Perimeter Difference x x = --- h) Below Grade Walls Area x Factor h1) 2-5 Feet Below Grade = --- h2) More than 5 Feet Below Grade = --- h3) Basement Floor = --- D HEAT GAIN SUB TOTAL PAGE 10 Btu/h A10 D Place This Value on Page 9 SENSIBLE

11 COMMERCIAL HEAT LOSS CALCULATIONS Page INFILTRATION LOSS GAIN 2a) Structural Infiltration 2b) Door Infiltration Volume of Conditioned Space Pressure Condition Peak Time of Day Occupancy Number of Doors A11 C11 F11 H11 Quality of Construction Air Changes/Hour Average Length of Stay Number of Occupants B11 D11 G11 I11 Structrural = AC/hr x Volume of Conditioned Space = Traffic Rate (TR) = # of Occupants x Openings J11 Infiltration 60 min/hr # of Doors x Average Length of Stay A11 x D11 = Winter TR I11 x 2 = J H11 x G11 CFM E11 Door(1) CFM x # of Doors = CFM K11 Door(2) CFM x # of Doors = CFM K12 2c) Total Infiltration CFM Total Infiltrartion CFM = Structural Infiltration + Door(s) Infiltration = E11 + K11 + K12 = CFM L11

12 COMMERCIAL HEAT LOSS CALCULATIONS Page 12 2d) Infiltration Heat Loss Sensible Loads Total Infiltration x Winter Design Temperature (D9) x 1.1 Exterior = x x 1.1 = --- Sensible Loads Total Infiltration x Actual Temperature Difference (DT) x 1.1 Interior a) = x x 1.1 = --- b) = x x 1.1 = --- USE THIS VALUE ONLY TO DETERMINE SUBTOTAL A12 3. DUCT HEAT LOSS SENSIBLE HEAT LOSS SUB TOTAL A10 (page 10) = INFILTRATION HEAT LOSS A12 (Page 12) = SENSIBLE SUB TOTAL ( A10 + A12 ) = B12 B12 x Factor Supply Duct Heat Loss = x = --- Return Duct Heat Loss = x = --- D HEAT LOSS SUB TOTAL PAGE 12 Btu/h --- D Place This Value on Page 9 SENSIBLE

13 COMMERCIAL HEAT LOSS CALCULATIONS Page VENTILATION Number of Occupants CFM per Person A13 B13 Occupant CFM A13 x B13 Total CFM = x = CFM C13 Total Exhaust CFM = (From Design Specifications) D13 Determine Total Ventilation Select C13 OR D13 --> Whichever Is The Greatest CFM E13 Sensible Load Total Ventilation (E13) x Winter Design Temperature (D9) x 1.1 x x 1.1 = HUMIDIFICATION REQUIREMENTS Total Infiltration CFM (L11) + Total Ventilation CFM (E13) = Total CFM + F13 Sensible Heat Loss = Total CFM (F13) x Humidification Heat Loss 100 = x G13 = D HEAT LOSS SUB TOTAL PAGE 13 Btu/h --- D Place This Value on Page 9 SENSIBLE

14 COMMERCIAL HEAT GAIN - HEAT LOSS CALCULATION LOAD FORM CALCULATIONS AND NOTES

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