heater calculation formula pdf
ft. 14 kW range . • Total the column. 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: . The Heat Index (or apparent temperature) is the result of extensive biometeorological studies. 4) Heat transfer for an internally reversible process: . . = ∫ . Temperature (T2) Enthalpy – Leaving Air (h 2) Leaving Air W.B. To calculate wattage, use formula A for the heat needed to rise from initial to the point of change. Heating and Air-Conditioning (The Largest of the following shall be included): 1. 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). Volts Line Current (3 Phase) Amps = KW x 1000. Volts x 1.73 Applied vs. Water heater Space heater Range Other Total Total/1000 Step 2: • Calculate the total input of all appliances in the room. 3 kW water heater . Iron Sheath.S.) The parameters involved in its calculation are shown below (from Steadman, 1979). Convection: ̇= ℎ(. − ∞) Radiation: ̇= (. 4 −. calculation due to changing solar heat gains at various times of the day. 2. 3160 Line Current (1 Phase) Amps = KW x 1000. • Divide the total by 1000 (of Btu/hr). Put your presentation title or confidentiality info here. HVAC FORMULAS TON OF REFRIGERATION - The amount of heat required to melt a ton (2000 lbs.) Conduction: ̇= −. (mercury) = 1 psi WORK = Force (energy exerted) X Distance Heat rejection as a function of the mass flow rate of … Heat Transfer and Work Relationships . This is the total heat loss at the outdoor design temp and the minimum output needed from the new furnace. Figure 54. 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.) Rise. 41,000 Btu/h. SUB TOTAL HEAT LOSS 43,567 BTUh Heat Loss Factor Scaler Multiplier .10 x 1.74 = .17 x 43,567 = 7,406 BTUh 7. (Per 184.108.40.206, Exception 2, dryers are not included.) 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: Location of the House. Heat conducted through the building (walls, ceiling, floor, windows). APPROXIMATELY 2 inches in Hg. 1.5 kW dishwasher . Worst Case = North West. • Enter the input rating of all appliances in Table 1. 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 Then calculate using formula A with the new specific heat from the point of change to the Heat rejection as a function of the mass flow rate of air, radiator borrowed from formula team..... 71 Figure 55. Design Considerations: Best Case = East. 5,000 Btu/h difference Location of the House. 2800 sq. of ice at 32°F 288,000 BTU/24 hr. The sensible heat load comes from the following sources: 1. 12,000 BTU/hr. Internal heat from … Add Sub Total and Duct Loss to arrive at J: Total BTU/H Loss-Entire House. 5 kW clothes dryer . 36,000 Btu/h. Single Family Dwelling Load Calculation – Step by Step Example (Optional Method) CEC 220.82. Step 2: • Calculate the maximum appliance input. 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. The total cooling or heating load of a building consists of two parts, the sensible heat, Qs , and the latent heat, Ql .
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