Step 2: • Calculate the maximum appliance input. Heat conducted through the building (walls, ceiling, floor, windows). Electric Heater Formulas Conversion 1 KW = 3413 BTU Load Requirement KW = CFM x Temp. Rated KW Factors Rated Voltage Applied Voltage; 120 208 220 230 240 277 440 460 480; 120: 1.00: 3.00: 3.36: 3.67: 4.00: 5.33: Single Family Dwelling Load Calculation – Step by Step Example (Optional Method) CEC 220.82. . Heat rejection as a function of the mass flow rate of … The total cooling or heating load of a building consists of two parts, the sensible heat, Qs , and the latent heat, Ql . 1.5 kW dishwasher . Conduction: ̇= −. Location of the House. Heat rejection as a function of the mass flow rate of air, radiator borrowed from formula team..... 71 Figure 55. • Enter the input rating of all appliances in Table 1. Rise. Worst Case = North West. Water heater Space heater Range Other Total Total/1000 Step 2: • Calculate the total input of all appliances in the room. Volts Line Current (3 Phase) Amps = KW x 1000. HVAC FORMULAS TON OF REFRIGERATION - The amount of heat required to melt a ton (2000 lbs.) Temperature (T2) Enthalpy – Leaving Air (h 2) Leaving Air W.B. This is the total heat loss at the outdoor design temp and the minimum output needed from the new furnace. Volts x 1.73 Applied vs. (Per 9.3.1.1, Exception 2, dryers are not included.) APPROXIMATELY 2 inches in Hg. The sensible heat load comes from the following sources: 1. • Divide the total by 1000 (of Btu/hr). 3.412 x Heat-up Time (Hours) Formula C : *** The Specific Heat of a material changes at some temperature due to melting (fusion) or evaporation (vaporation). 3160 Line Current (1 Phase) Amps = KW x 1000. Convection: ̇= ℎ(. − ∞) Radiation: ̇= (. 4 −. Heating and Air-Conditioning (The Largest of the following shall be included): 1. Calculations for heating air in a duct Once the volume of air in standard cubic feet per minute (SCFM) and the required temperature rise in °F (ΔT) are known, the required kilowatt rating (KW) of the heater can be determined from the following formula: Then calculate using formula A with the new specific heat from the point of change to the To calculate wattage, use formula A for the heat needed to rise from initial to the point of change. Iron Sheath.S.) Add Sub Total and Duct Loss to arrive at J: Total BTU/H Loss-Entire House. calculation due to changing solar heat gains at various times of the day. Allowable Watt Density & Heater Selection - Air Heating Graph G-105S — Strip Heater Air Heating-Selection of Watt Density Graph G-106S — Finstrip® Heater Air Heating-Selection of Watt Density W/In 2 20 15 10 5 0 ABC Outlet Air Temperature (°F) 700 600 500 400 300 200 100 0 16 9 4 1 16 4 1.S.) 12,000 BTU/hr. Put your presentation title or confidentiality info here. The parameters involved in its calculation are shown below (from Steadman, 1979). Each of these parameters can be described by an equation but they are given assumed magnitudes (in parentheses) in order to ... \WINDOWS\Desktop\heatindx.PDF The Heat Index (or apparent temperature) is the result of extensive biometeorological studies. Basic Air Conditioning Formulas TO DETERMINE COOLING Total Airflow Infiltration or Ventilation Number of Air Changes Per Hour – Total Number of Air Changes Per Hour – Outdoor Air Total Heat (HT) Sensible Heat (H S) Latent Heat (HL) Leaving Air D.B. 3 kW water heater . 5 kW clothes dryer . Heat Transfer and Work Relationships . 5,000 Btu/h difference Location of the House. ft. 14 kW range . 2. 36,000 Btu/h. 2800 sq. Figure 54. of ice at 32°F 288,000 BTU/24 hr. • Total the column. SUB TOTAL HEAT LOSS 43,567 BTUh Heat Loss Factor Scaler Multiplier .10 x 1.74 = .17 x 43,567 = 7,406 BTUh 7. 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