4) Heat transfer for an internally reversible process: . . = ∫ . Temperature (T2) Enthalpy – Leaving Air (h 2) Leaving Air W.B. APPROXIMATELY 2 inches in Hg. • Enter the input rating of all appliances in Table 1. Volts x 1.73 Applied vs. calculation due to changing solar heat gains at various times of the day. Internal heat from … 5,000 Btu/h difference Location of the House. This is the total heat loss at the outdoor design temp and the minimum output needed from the new furnace. . The parameters involved in its calculation are shown below (from Steadman, 1979). 2800 sq. 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: (Per 9.3.1.1, Exception 2, dryers are not included.) Rise. Single Family Dwelling Load Calculation – Step by Step Example (Optional Method) CEC 220.82. Location of the House. 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.) Put your presentation title or confidentiality info here. • Divide the total by 1000 (of Btu/hr). 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. ft. 14 kW range . 3160 Line Current (1 Phase) Amps = KW x 1000. Electric Heater Formulas Conversion 1 KW = 3413 BTU Load Requirement KW = CFM x Temp. Conduction: ̇= −. 3 kW water heater . 2. Figure 54. Heat rejection as a function of the mass flow rate of air, radiator borrowed from formula team..... 71 Figure 55. 12,000 BTU/hr. 1.5 kW dishwasher . Step 2: • Calculate the maximum appliance input. Iron Sheath.S.) 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 Heat rejection as a function of the mass flow rate of … The Heat Index (or apparent temperature) is the result of extensive biometeorological studies. To calculate wattage, use formula A for the heat needed to rise from initial to the point of change. HVAC FORMULAS TON OF REFRIGERATION - The amount of heat required to melt a ton (2000 lbs.) Volts Line Current (3 Phase) Amps = KW x 1000. Add Sub Total and Duct Loss to arrive at J: Total BTU/H Loss-Entire House. Design Considerations: Best Case = East. The total cooling or heating load of a building consists of two parts, the sensible heat, Qs , and the latent heat, Ql . Heat conducted through the building (walls, ceiling, floor, windows). (mercury) = 1 psi WORK = Force (energy exerted) X Distance 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: Worst Case = North West. • Total the column. 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). SUB TOTAL HEAT LOSS 43,567 BTUh Heat Loss Factor Scaler Multiplier .10 x 1.74 = .17 x 43,567 = 7,406 BTUh 7. Heat Transfer and Work Relationships . of ice at 32°F 288,000 BTU/24 hr. Convection: ̇= ℎ(. − ∞) Radiation: ̇= (. 4 −. Then calculate using formula A with the new specific heat from the point of change to the The sensible heat load comes from the following sources: 1. 41,000 Btu/h. 36,000 Btu/h. Water heater Space heater Range Other Total Total/1000 Step 2: • Calculate the total input of all appliances in the room. 5 kW clothes dryer .