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Btus (IT)/second/square foot/°F to Chus/hour/square foot/°C Converter (Btu/(s·ft²·°F) to CHU/(h·ft²·°C))

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Live Conversion • ISO 80000-5:2019 Certified
1 Btu (IT)/second/square foot/°F = 3599.95911693 CHU/hour/square foot/°C
1 Btu/(s·ft²·°F) = 3599.959117 CHU/(h·ft²·°C) • 1 CHU/(h·ft²·°C) = 0.000277781 Btu/(s·ft²·°F)
Btu (IT)/second/square foot/°F to CHU/hour/square foot/°C: One Btu (IT)/second/square foot/°F is equal to 3599.95911693 Chus/hour/square foot/°C.
Certified Authority Value
3599.95911693
CHU/(h·ft²·°C)
Exact: 1 CHU/(h·ft²·°C) ≡ 0.0002777809324 Btu/(s·ft²·°F)
Btu/(s·ft²·°F)
Btu/(s·ft²·°F)
Swap to CHU/hour/square foot/°C to Btu (IT)/second/square foot/°F
Swap to CHU/hour/square foot/°C to Btu (IT)/second/square foot/°F
CHU/(h·ft²·°C)
CHU/(h·ft²·°C) 3599.95911693
Quick Values:
Conversion Formula
To convert Btu (IT)/second/square foot/°F to CHU/hour/square foot/°C, multiply by 3599.95911693
Btu/(s·ft²·°F) × 3599.95911693 = CHU/(h·ft²·°C)

Calculation: 1 Btu/(s·ft²·°F) × 3599.95911693 = 3599.95911693 CHU/(h·ft²·°C)

Common Btu (IT)/second/square foot/°F to CHU/hour/square foot/°C Calculations

Quick-lookup reference table showing calculated equivalents for standard increments between Btu (IT)/second/square foot/°F (Btu/(s·ft²·°F)) and CHU/hour/square foot/°C (CHU/(h·ft²·°C)).

Tap any row to calculate
Btu (IT)/second/square foot/°F to CHU/hour/square foot/°C: Primary Direct Table (15 Steps)
Btu (IT)/second/square foot/°F to CHU/hour/square foot/°C Conversion Reference Table
Conversion & Equivalent Value Scientific Notation
0.001 Btu/(s·ft²·°F) 3.599959 CHU/(h·ft²·°C) 3.6 × 10⁰
0.01 Btu/(s·ft²·°F) 35.999591 CHU/(h·ft²·°C) 3.6 × 10¹
0.1 Btu/(s·ft²·°F) 359.995912 CHU/(h·ft²·°C) 3.6 × 10²
0.5 Btu/(s·ft²·°F) 1799.979558 CHU/(h·ft²·°C) 1.8 × 10³
1 Btu/(s·ft²·°F) 3599.959117 CHU/(h·ft²·°C) 3.6 × 10³
2 Btu/(s·ft²·°F) 7199.918234 CHU/(h·ft²·°C) 7.2 × 10³
5 Btu/(s·ft²·°F) 17999.795585 CHU/(h·ft²·°C) 1.8 × 10⁴
10 Btu/(s·ft²·°F) 35999.591169 CHU/(h·ft²·°C) 3.6 × 10⁴
20 Btu/(s·ft²·°F) 71999.182339 CHU/(h·ft²·°C) 7.2 × 10⁴
25 Btu/(s·ft²·°F) 89998.977923 CHU/(h·ft²·°C) 9 × 10⁴
50 Btu/(s·ft²·°F) 179997.955846 CHU/(h·ft²·°C) 1.8 × 10⁵
100 Btu/(s·ft²·°F) 359995.911693 CHU/(h·ft²·°C) 3.6 × 10⁵
250 Btu/(s·ft²·°F) 899989.779231 CHU/(h·ft²·°C) 9 × 10⁵
500 Btu/(s·ft²·°F) 1799979.558463 CHU/(h·ft²·°C) 1.8 × 10⁶
1000 Btu/(s·ft²·°F) 3599959.116926 CHU/(h·ft²·°C) 3.6 × 10⁶
CHU/hour/square foot/°C to Btu (IT)/second/square foot/°F: Reciprocal Summary
CHU/hour/square foot/°C to Btu (IT)/second/square foot/°F Conversion Reference Table
Reciprocal & Equivalent Value Scientific Notation
1 CHU/(h·ft²·°C) 0.000277781 Btu/(s·ft²·°F) 2.778 × 10⁻⁴
5 CHU/(h·ft²·°C) 0.0013889 Btu/(s·ft²·°F) 1.389 × 10⁻³
10 CHU/(h·ft²·°C) 0.00277781 Btu/(s·ft²·°F) 2.778 × 10⁻³
50 CHU/(h·ft²·°C) 0.013889 Btu/(s·ft²·°F) 1.389 × 10⁻²
100 CHU/(h·ft²·°C) 0.0277781 Btu/(s·ft²·°F) 2.778 × 10⁻²
View Complete 15-Row CHU/hour/square foot/°C to Btu (IT)/second/square foot/°F Table

Real-World Context & Everyday Benchmarks

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To help contextualize these units in everyday life, science, and engineering, here are verified real-world reference points for Btu (IT)/second/square foot/°F (Btu/(s·ft²·°F)) and CHU/hour/square foot/°C (CHU/(h·ft²·°C)):

Btu (IT)/second/square foot/°F References:

  • Liquid rocket regenerative cooling jacket convective coefficient 0.2 Btu/(s·ft²·°F)

CHU/hour/square foot/°C References:

  • British thermal engineering shell-and-tube heat exchanger 150 CHU/(h·ft²·°C)

Tap any benchmark above to automatically calculate its exact equivalent in CHU/hour/square foot/°C.

ISQ Dimension: [M T⁻³ Θ⁻¹] Coherent SI Unit: watt per square meter kelvin (W/(m²·K)) Thermodynamics & Heat Transfer

How to Convert Btu (IT)/second/square foot/°F to CHU/hour/square foot/°C

Converting Btu (IT)/second/square foot/°F (Btu/(s·ft²·°F)) to CHU/hour/square foot/°C (CHU/(h·ft²·°C)) is a core calculation in Heat Transfer Coefficient, which quantifies the proportionality constant between the heat flux and the thermodynamic driving temperature difference. This calculation navigates the boundary between the International Metric System (SI) and British Imperial / US Customary engineering standards. In contemporary metrology, Imperial units are defined in terms of exact SI standards via international agreements—notably NIST SP 811 and the 1959 International Yard and Pound Agreement. Exactly 1 Btu (IT)/second/square foot/°F equals 3599.959117 CHU/hour/square foot/°C, while 1 CHU/(h·ft²·°C) equals 0.000277781 Btu/(s·ft²·°F).

Direct Factor1 Btu/(s·ft²·°F) = 3599.959117 CHU/(h·ft²·°C)
Inverse Ratio1 CHU/(h·ft²·°C) = 0.000277781 Btu/(s·ft²·°F)
Conversion ScaleMetric SI to British Imperial / US Customary Bridge
First-Principles SI Derivation ProofNIST SP 811 / ISO 80000 Compliance

Mathematical Conversion Derivation via Coherent SI Base Unit

Under the International System of Quantities (ISQ), dimensional conversion between non-SI units is rigorously resolved by bridging through the coherent SI base unit (watt per square meter kelvin (W/(m²·K))) without arbitrary rounding:

Vtarget=Vsource×(ksource→SIktarget→SI)V_{\text{target}} = V_{\text{source}} \times \left( \frac{k_{\text{source} \to \text{SI}}}{k_{\text{target} \to \text{SI}}} \right)
Universal Dimensional Conversion Law (ISO 80000 / NIST SP 811)
1. Source SI Bridge (ksource):1 Btu/(s·ft²·°F) = 20441.537204 watt per square meter kelvin (W/(m²·K))
2. Target SI Bridge (ktarget):1 CHU/(h·ft²·°C) = 5.678269 watt per square meter kelvin (W/(m²·K))
Step-by-step substitution for Btu (IT)/second/square foot/°F → CHU/hour/square foot/°C:V(CHU/(h·ft²·°C)) = V(Btu/(s·ft²·°F)) × ( 20441.537204 / 5.678269 ) = V(Btu/(s·ft²·°F)) × 3599.959117
Mathematical FormulaValue in CHU/hour/square foot/°C = Value in Btu (IT)/second/square foot/°F × 3599.95911693Direct computational formula applied for standard conversion.
Worked Example

To convert 50 Btu (IT)/second/square foot/°F (Btu/(s·ft²·°F)) to CHU/hour/square foot/°C (CHU/(h·ft²·°C)): multiply 50 by 3599.959117 to get 179997.955846 CHU/(h·ft²·°C). At an industrial engineering scale, 2500 Btu/(s·ft²·°F) converts to 8999897.792314 CHU/(h·ft²·°C).

Inverse check: 1 CHU/(h·ft²·°C) = 0.000277781 Btu/(s·ft²·°F).

Understanding Btu (IT)/second/square foot/°F and CHU/hour/square foot/°C

Btu (IT)/second/square foot/°F

Btu/(s·ft²·°F)
Imperial / US

A Btu (IT)/second/square foot/°F (Btu/(s·ft²·°F)) is an imperial and US customary unit for heat transfer coefficient.

Applications & Practical Context

In practical heat transfer coefficient terms, a liquid rocket regenerative cooling jacket convective coefficient equals 0.2 Btu/(s·ft²·°F).

Physical Setup

A physical magnitude of 1 Btu/(s·ft²·°F) corresponds to 20441.537204 W/(m²·K) in standard SI measurement.

Conversion to SI Unit: watt per square meter kelvin (W/(m²·K))
1 Btu/(s·ft²·°F) = 20441.537204 W/(m²·K)

CHU/hour/square foot/°C

CHU/(h·ft²·°C)
Imperial / US

A CHU/hour/square foot/°C (CHU/(h·ft²·°C)) is an imperial and US customary unit for heat transfer coefficient.

Applications & Practical Context

In practical heat transfer coefficient terms, a British thermal engineering shell-and-tube heat exchanger equals 150 CHU/(h·ft²·°C).

Physical Setup

A physical magnitude of 1 CHU/(h·ft²·°C) corresponds to 5.678269 W/(m²·K) in standard SI measurement.

Conversion to SI Unit: watt per square meter kelvin (W/(m²·K))
1 CHU/(h·ft²·°C) = 5.678269 W/(m²·K)

Domain Metrology & Engineering Applications

Governing Law & Equation

Newton's Law of Cooling (q = h · ΔT)

Measurement Instrumentation

Rigorously quantified in laboratory and field settings using surface heat flux transducer plates coupled with surface RTD arrays, and wind tunnel boundary layer calorimeters.

Primary Industry Sectors

Applied across industrial heat exchanger rating, nuclear reactor cooling loop simulation, electronics forced-air cooling, and architectural U-value certification under international metrology standard ISO 80000-5:2019, ASME PTC.

Institutional Metrology & Standard Authority:

Formulas, conversion coefficients, and base definitions on this page strictly adhere to the ISO 80000-5:2019, ASME PTC and the BIPM SI Brochure (9th Edition). Governed by Newton's Law of Cooling (q = h · ΔT) under ISO 80000 dimensional vector [M T⁻³ Θ⁻¹].

Multi-Variable Engineering Bridge Convective Thermodynamics & Cooling

Heat Transfer Coefficient to Convective Flux Bridge (W/m² • kW/m² • BTU/(h·ft²) • cal/(s·cm²))

Calculate Newton’s law of cooling convective heat flux q" = h × ΔT across convective film temperature drops, bridging heat transfer coefficient [M T⁻³ Θ⁻¹] with heat flux [M T⁻³].

q" = h × ΔT
Vector: [W/(m²·K)] × [K] → [W/m²]
Live Calculated Bridge Equivalent:
1 Btu/(s·ft²·°F) at Forced Air Duct Cooling (ΔT = 25 K) = 511038.4301 W/m²
Equals 511.0384 kW/m² • 161998.3626 BTU/(h·ft²) • 12.205943 cal/(s·cm²)
SI Heat Flux
511038.4301
W/m²
Watts per Square Meter
Solar / Combustion
511.0384
kW/m²
Kilowatts per Square Meter
US Building Envelope
161998.3626
BTU/(h·ft²)
BTU per Hour Sq. Foot
CGS Thermal
12.205943
cal/(s·cm²)
Calories per Second Sq. Cm
Meteorology
732.4884
Ly/min
Langley per Minute
Furnace Flux
0.511038
MW/m²
Megawatts per Square Meter
  1. 1. Normalize Input to SI Base Unit (W/(m²·K)):
    h = 1 Btu/(s·ft²·°F) × 20441.5372036 = 20441.5372036 W/(m²·K)
  2. 2. Apply Engineering Parameter (ΔT):
    Selected condition: Forced Air Duct Cooling (ΔT = 25 K) at ΔT = 25 K
  3. 3. Execute Governing Physical Law in SI Units:
    q" = h × ΔT = (20441.5372036 W/(m²·K)) × (25 K) = 511038.43009 W/m²
  4. 4. Convert to Standard Engineering Units:
    • W/m²: 511038.43009 × 1 = 511038.4301 W/m² (Watts per Square Meter) • kW/m²: 511038.43009 × 0.001 = 511.0384 kW/m² (Kilowatts per Square Meter) • BTU/(h·ft²): 511038.43009 × 0.317 = 161998.3626 BTU/(h·ft²) (BTU per Hour Sq. Foot) • cal/(s·cm²): 511038.43009 × 2.3885 × 10⁻⁵ = 12.205943 cal/(s·cm²) (Calories per Second Sq. Cm) • Ly/min: 511038.43009 × 0.001433 = 732.4884 Ly/min (Langley per Minute) • MW/m²: 511038.43009 × 1 × 10⁻⁶ = 0.511038 MW/m² (Megawatts per Square Meter)
Explore Full Heat Flux Density Converter →
Engineering Substance / Operating Standard Parameter Value (K) Reference State / Condition Typical Industrial & Engineering Application
Natural Air Convection (ΔT = 15 K) 15 ΔT = 15 K (15°C) Still room air room heating surface delta
Forced Air Duct Cooling (ΔT = 25 K) 25 ΔT = 25 K (25°C) Forced fan ventilation heatsink airflow
Forced Liquid Water Cooling (ΔT = 30 K) 30 ΔT = 30 K Pumped liquid cold plate or engine jacket
Nucleate Boiling Heat Transfer (ΔT = 50 K) 50 ΔT = 50 K Boiler evaporator tube wall boundary
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Frequently Asked Questions

There are exactly 3599.95911693 chus/hour/square foot/°c (CHU/(h·ft²·°C)) in 1 btu (it)/second/square foot/°f (Btu/(s·ft²·°F)). To calculate larger amounts manually, simply multiply your total number of btus (it)/second/square foot/°f by the conversion multiplier of 3599.95911693.

The mathematical formula to convert btus (it)/second/square foot/°f to chus/hour/square foot/°c is: [value] * 3599.95911693 = chus/hour/square foot/°c. Rather than doing the math manually, you can use our high-precision online calculator to process this exact equation instantly without rounding errors.

To perform the reverse calculation from chus/hour/square foot/°c back to btus (it)/second/square foot/°f, you must divide your starting value by 3599.95911693. Our bidirectional tool automatically computes this inverse equation the moment you type into the chu/hour/square foot/°c input field.

1 Btu (IT)/second/square foot/°F is larger than 1 CHU/hour/square foot/°C. Specifically, 1 Btu (IT)/second/square foot/°F equals exactly 3599.95911693 chus/hour/square foot/°c, making it 3599.9591 times larger (a difference of 3.56 orders of magnitude). Therefore, quantities expressed in chus/hour/square foot/°c require a larger numerical value to represent the same physical amount.

Under standard international measurement guidelines, 1 Btu (IT)/second/square foot/°F converts to 3599.95911693 chus/hour/square foot/°c. Precise numerical conversion factors ensure consistency across laboratory, engineering, and field data.