How to calculate btu heat

    • [PDF File]AP* Environmental Science Mastering the M ath - Folsom Cordova Unified ...

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      an input of 10,000 BTU’s of heat is required to produce an output of 1 kWh of electricity. (a) Calculate the number of BTU’s of heat needed to generate the electricity produced by the power plant each day. (b) Calculate the number of pounds of coal consumed by the power plant each day, assuming that one pound of coal yields 5,000 BTU’s of ...

    • [PDF File]Calculating Greenhouse Heating Requirements - Purdue University

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      air temperature at a target level for the crop. To calculate heat requirement (Q, BTU/hr) for maintaining a target air temperature inside a greenhouse, we need to know the (i) temperature difference or ΔT between inside and outside air, (ii) surface area or A of the greenhouse and (iii) overall heat transfer co-efficient

    • [PDF File]T) x CFM x 1.08 1 - RuppAir

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      This number includes the specific heat (Cp) of air (0.24 BTU per pound per degree Fahrenheit). It takes 0.24 BTU of heat to change the temperature of one pound of air by one degree F. The 1.08 factor also contains the specific density of air (0.075 pounds per cubic foot). The air is measured in CFM, yet the specific heat is per pound of air.

    • [PDF File]Heat Dissipation in Electrical Enclosures | Fan/Blower Selection and Sizing

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      Heat Dissipation in Electrical Enclosures Spec-00488 D Subject to change without notice PH ... First calculate the surface area of the enclosure and, from the expected heat load and the surface area, determine the heat input power in ... One BTU is the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit.

    • [PDF File]Refrigeration Manual - Emerson

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      Q = Heat transfer, BTU/Hr U = Overall heat transfer coeffi cient BTU/(hour)(sq. ft.)(°F TD) A = Area in square feet TD = Temperature differential between sides of thermal barrier, for example, between outside design temperature and the refrigerated space temperature. Q is the rate of heat fl ow, the quantity of heat fl owing

    • [PDF File]Heating and Cooling Greenhouses - Purdue University

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      Calculate Heat and Fuel Requirement. How much heat (BTU/hr) is needed to maintain 70°F in a greenhouse when outside air temperature is 36°F. The greenhouse is arch-shape with a surface area of 5000 square feet and covered with a double-polyethylene with IR coating on inside. Propane is used as fuel to heat the greenhouse.

    • [PDF File]Back to Basics Useful Equations when Sizing Coils with CoilPro

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      expressed in BTU/lb and is normally designated by “H”. For air, enthalpy is expressed in BTU/lb of dry air. Saturated air at -3° F has been assigned the value of 0 BTU/lb. The equation for calculating the total heat added to or taken from a fluid flow is: Q = M * Delta H Where: Q = The amount of heat transferred to or from the fluid (BTU/hr)

    • [PDF File]HVAC Rule of Thumb Calculator - Engineering Pro Guides

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      heat rejection from air to water greatly improves the efficiency because the heat transfer is much better with water due to its increased heat capacity. EER: The Energy Efficiency Ratio or EER is the ratio of the total cooling Btu/h to the total input power in watts. The conversion from EER to kW/ton is shown below. 1 ' ' 4 L 1 $ P Q D 1 9 = P ...

    • QUICK CALCULATIONS - Heatcraft Refrigeration Products

      Heat Motors Conduction Q Total Typical = U x Room A x (°F. out-Volume Temp. Temp. °F. 6 in) Legend: “Q Total” is total heat transfer in BTU per a) Specific hour 8 (BTUH) “U” is coefficient 8 of 19-28 2100 heat per transfer 19-35 1900 in BTU / (hour x sq. ft. x °F.) “x” is the symbol for multiply “A” is area in e) square feet ...

    • [PDF File]A/C Cooling Load calculation and measurement - Testo

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      4.5 x the measured CFM x Delta enthalpy = BTU output. A more precise calculation of the actual heat absorption, without knowing the total sq. footage, can be done using the testo smart probes 405i (hotwire anemometer) and two 605i (thermal hygrometers): To find the exact amount of heat transfer, we need to measure the air flow rate (CFM)

    • AIR SYSTEMS – ENERGY SERIES Energy Recovery Wheels

      x1 = OA temp (°Fdb) or enthalpy (btu/lb.) x2 = SA temp (°Fdb) or enthalpy (btu/lb.) x3 = RA temp. (°Fdb) or enthalpy (btu/lb.) Vs = Supply (or outside) air volume (cfm) Vmin = The lower of the exhaust or supply air volume (cfm) Amount of Heat Transferred The sensible and total energy transferred by the energy recovery wheel can be calculated ...

    • [PDF File]How do you calculate GPM? - FIA, Inc

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      Heat load is in BTU/Hr or BTUH 'T = Temperature difference between the supply and return °F 500 is the constant for standard water properties at 60°F Density: 8.33 lbs. per gal. Specific heat: 1BTU/lb °F The complete calculation is then: You will notice in the formula being used that the specific heat and density are referenced to 60°F wa-ter.

    • [PDF File]Shell and Tube Heat Exchangers - Basic Calculations

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      Btu - British Thermal Unit: The “Btu” is the standard unit of measurement for heat. A Btu is defined as the amount of energy needed to raise the temperature of one pound of water from 58.5°F to ... When used as a design equation to calculate the required heat transfer surface area, the equa-tion can be rearranged to become: A = Q/ (U x ΔT ...

    • [PDF File]Overview General heat rate: Heat Rate (Btu/kWh) = Energy Input (Btu) ÷ ...

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      increases heat rate by 11.2 Btu/kWh resulting in an average increase in annual fuel cost of • The maximum efficiency or rock bottom number for heat rate is noted in CCGT plants with a net unit heat rate starting at 7,000 Btu/kWh • Heat rates for coal-fired power plants range from 9,000 – 12,000 Btu/kWh (22% of domestic coal- fired plants ...

    • [PDF File]Methodology for Thermal Efficiency and Energy Input Calculations and ...

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      LHV = lower heating value of fuel in Btu/lb, HHV = higher heating value of fuel in Btu/lb, W = Weight % of moisture in fuel, and H = Weight % of hydrogen in fuel. As discussed in the preamble of the proposed rule for which this TSD is provided, EPA requests comment on whether the formula for calculating lower heating value shown above should be

    • [PDF File]Flow rate, heat output and Delta-T - PM Engineer

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      along the fin-tube, you can calculate the rate of heat dissipation. Where: Q = rate of heat output (Btu/h) D = density of the fluid (lb/ft3) c = specific heat of fluid (Btu/lb/ºF) f = flow rate (gpm) ∆T = temperature drop (°F) 8.01 = a number that makes the units correct You now have a measurement of the heat output at a flow rate of 8 gpm.

    • [PDF File]A Method for Calculating Transient Surface Temperatures and ... - NASA

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      heat flux, Btu/ft 2 sec. 2 q/q 0 ratio of circumferential heat flux on a sphere or cylinder to the stagnation point heat flux r ... The equation used to calculate surface temperatures and heat flux for three-dimensional stagnation points and two-dimensional stagnation points without sweep is (ref. 3)* (1)

    • [PDF File]British Thermal Unit Conversion Factors - U.S. Energy Information ...

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      10 barrels of asphalt has a heat content of approximately 66.36 million Btu (10 barrels x 6.636 million Btu per barrel = 66.36 million Btu). The heat content rates (i.e., thermal conversion factors) provided in this section represent the gross (or higher or upper) energy content of the fuels.

    • CDAM Chapter 7 Heat-loss considerations and calculations - Uponor

      scenario) by determining the heat loss and heat gain. Downward loss Downward loss is the amount of heat energy in BTU/h transferred downward from the radiant floor at any given load. Whether calculating heat loss manually or with a design program, downward loss is a critical factor. Downward loss is significant with a radiant floor heating

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