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

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Live Conversion • ISO 80000-5:2019 Certified
1 CHU/hour/sq. foot/°C = 0.00027777334 BTU (IT)/second/sq. foot/°F
1 CHU/(h·ft²·°C) = 0.000277773 Btu/(s·ft²·°F) • 1 Btu/(s·ft²·°F) = 3600.057566 CHU/(h·ft²·°C)
CHU/hour/sq. foot/°C to BTU (IT)/second/sq. foot/°F: One CHU/hour/sq. foot/°C is equal to 0.00027777334 Btus (IT)/second/sq. foot/°F.
Certified Authority Value
0.00027777
Btu/(s·ft²·°F)
Exact: 1 Btu/(s·ft²·°F) ≡ 3600.057565524 CHU/(h·ft²·°C)
CHU/(h·ft²·°C)
CHU/(h·ft²·°C)
Swap to BTU (IT)/second/sq. foot/°F to CHU/hour/sq. foot/°C
Swap to BTU (IT)/second/sq. foot/°F to CHU/hour/sq. foot/°C
Btu/(s·ft²·°F)
Btu/(s·ft²·°F) 0.00027777334
Quick Values:
Conversion Formula
To convert CHU/hour/sq. foot/°C to BTU (IT)/second/sq. foot/°F, multiply by 0.00027777334
CHU/(h·ft²·°C) × 0.00027777334 = Btu/(s·ft²·°F)

Calculation: 1 CHU/(h·ft²·°C) × 0.00027777334 = 0.00027777334 Btu/(s·ft²·°F)

Common CHU/hour/sq. foot/°C to BTU (IT)/second/sq. foot/°F Calculations

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

Tap any row to calculate
CHU/hour/sq. foot/°C to BTU (IT)/second/sq. foot/°F: Primary Direct Table (15 Steps)
CHU/hour/sq. foot/°C to BTU (IT)/second/sq. foot/°F Conversion Reference Table
Conversion & Equivalent Value Scientific Notation
0.001 CHU/(h·ft²·°C) 2.777733 × 10⁻⁷ Btu/(s·ft²·°F) 2.778 × 10⁻⁷
0.01 CHU/(h·ft²·°C) 2.777733 × 10⁻⁶ Btu/(s·ft²·°F) 2.778 × 10⁻⁶
0.1 CHU/(h·ft²·°C) 2.777733 × 10⁻⁵ Btu/(s·ft²·°F) 2.778 × 10⁻⁵
0.5 CHU/(h·ft²·°C) 0.000138887 Btu/(s·ft²·°F) 1.389 × 10⁻⁴
1 CHU/(h·ft²·°C) 0.000277773 Btu/(s·ft²·°F) 2.778 × 10⁻⁴
2 CHU/(h·ft²·°C) 0.000555547 Btu/(s·ft²·°F) 5.555 × 10⁻⁴
5 CHU/(h·ft²·°C) 0.00138887 Btu/(s·ft²·°F) 1.389 × 10⁻³
10 CHU/(h·ft²·°C) 0.00277773 Btu/(s·ft²·°F) 2.778 × 10⁻³
20 CHU/(h·ft²·°C) 0.00555547 Btu/(s·ft²·°F) 5.555 × 10⁻³
25 CHU/(h·ft²·°C) 0.00694433 Btu/(s·ft²·°F) 6.944 × 10⁻³
50 CHU/(h·ft²·°C) 0.0138887 Btu/(s·ft²·°F) 1.389 × 10⁻²
100 CHU/(h·ft²·°C) 0.0277773 Btu/(s·ft²·°F) 2.778 × 10⁻²
250 CHU/(h·ft²·°C) 0.0694433 Btu/(s·ft²·°F) 6.944 × 10⁻²
500 CHU/(h·ft²·°C) 0.138887 Btu/(s·ft²·°F) 1.389 × 10⁻¹
1000 CHU/(h·ft²·°C) 0.277773 Btu/(s·ft²·°F) 2.778 × 10⁻¹
BTU (IT)/second/sq. foot/°F to CHU/hour/sq. foot/°C: Reciprocal Summary
BTU (IT)/second/sq. foot/°F to CHU/hour/sq. foot/°C Conversion Reference Table
Reciprocal & Equivalent Value Scientific Notation
1 Btu/(s·ft²·°F) 3600.057566 CHU/(h·ft²·°C) 3.6 × 10³
5 Btu/(s·ft²·°F) 18000.287828 CHU/(h·ft²·°C) 1.8 × 10⁴
10 Btu/(s·ft²·°F) 36000.575655 CHU/(h·ft²·°C) 3.6 × 10⁴
50 Btu/(s·ft²·°F) 180002.878276 CHU/(h·ft²·°C) 1.8 × 10⁵
100 Btu/(s·ft²·°F) 360005.756552 CHU/(h·ft²·°C) 3.6 × 10⁵
View Complete 15-Row BTU (IT)/second/sq. foot/°F to CHU/hour/sq. foot/°C 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 CHU/hour/sq. foot/°C (CHU/(h·ft²·°C)) and BTU (IT)/second/sq. foot/°F (Btu/(s·ft²·°F)):

CHU/hour/sq. foot/°C References:

  • Stationary ambient air natural free convection on vertical wall 0.880565 CHU/(h·ft²·°C)
  • Forced air breeze blowing across automotive cooling radiator 8.8057 CHU/(h·ft²·°C)
  • Liquid water forced circulation inside heat exchanger pipe 528.34 CHU/(h·ft²·°C)
  • Nucleate boiling heat transfer in pressurized steam boiler tube 2641.7 CHU/(h·ft²·°C)

BTU (IT)/second/sq. foot/°F References:

  • Stationary ambient air natural free convection on vertical wall 0.000245 Btu/(s·ft²·°F)
  • Forced air breeze blowing across automotive cooling radiator 0.002446 Btu/(s·ft²·°F)
  • Liquid water forced circulation inside heat exchanger pipe 0.146758 Btu/(s·ft²·°F)
  • Nucleate boiling heat transfer in pressurized steam boiler tube 0.733792 Btu/(s·ft²·°F)

Tap any benchmark above to automatically calculate its exact equivalent in BTU (IT)/second/sq. foot/°F.

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

How to Convert CHU/hour/sq. foot/°C to BTU (IT)/second/sq. foot/°F

Converting CHU/hour/sq. foot/°C (CHU/(h·ft²·°C)) to BTU (IT)/second/sq. foot/°F (Btu/(s·ft²·°F)) 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 CHU/hour/sq. foot/°C equals 0.000277773 BTU (IT)/second/sq. foot/°F, while 1 Btu/(s·ft²·°F) equals 3600.057566 CHU/(h·ft²·°C).

Direct Factor1 CHU/(h·ft²·°C) = 0.000277773 Btu/(s·ft²·°F)
Inverse Ratio1 Btu/(s·ft²·°F) = 3600.057566 CHU/(h·ft²·°C)
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 CHU/(h·ft²·°C) = 5.678173 watt per square meter kelvin (W/(m²·K))
2. Target SI Bridge (ktarget):1 Btu/(s·ft²·°F) = 20441.748 watt per square meter kelvin (W/(m²·K))
Step-by-step substitution for CHU/hour/sq. foot/°C → BTU (IT)/second/sq. foot/°F:V(Btu/(s·ft²·°F)) = V(CHU/(h·ft²·°C)) × ( 5.678173 / 20441.748 ) = V(CHU/(h·ft²·°C)) × 0.000277773
Mathematical FormulaValue in BTU (IT)/second/sq. foot/°F = Value in CHU/hour/sq. foot/°C × 0.00027777334Direct computational formula applied for standard conversion.
Worked Example

For an engineering input of 75 CHU/(h·ft²·°C), applying the conversion factor yields exactly 0.020833 Btu/(s·ft²·°F). At larger operational scale, 480 CHU/hour/sq. foot/°C corresponds to 0.133331 Btu/(s·ft²·°F).

Inverse check: 1 Btu/(s·ft²·°F) = 3600.057566 CHU/(h·ft²·°C).

Understanding CHU/hour/sq. foot/°C and BTU (IT)/second/sq. foot/°F

CHU/hour/sq. foot/°C

CHU/(h·ft²·°C)
Imperial / US

A CHU/hour/sq. 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 stationary ambient air natural free convection on vertical wall equals 0.880565 CHU/(h·ft²·°C), a forced air breeze blowing across automotive cooling radiator equals 8.8057 CHU/(h·ft²·°C), a liquid water forced circulation inside heat exchanger pipe equals 528.34 CHU/(h·ft²·°C).

Physical Setup

A physical magnitude of 1 CHU/(h·ft²·°C) corresponds to 5.678173 W/(m²·K) in standard SI measurement.

Conversion to SI Unit: watt per square meter kelvin (W/(m²·K))
1 CHU/(h·ft²·°C) = 5.678173 W/(m²·K)

BTU (IT)/second/sq. foot/°F

Btu/(s·ft²·°F)
Imperial / US

A BTU (IT)/second/sq. 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 stationary ambient air natural free convection on vertical wall equals 0.000245 Btu/(s·ft²·°F), a forced air breeze blowing across automotive cooling radiator equals 0.002446 Btu/(s·ft²·°F), a liquid water forced circulation inside heat exchanger pipe equals 0.146758 Btu/(s·ft²·°F).

Physical Setup

A physical magnitude of 1 Btu/(s·ft²·°F) corresponds to 20441.748 W/(m²·K) in standard SI measurement.

Conversion to SI Unit: watt per square meter kelvin (W/(m²·K))
1 Btu/(s·ft²·°F) = 20441.748 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 CHU/(h·ft²·°C) at Forced Air Duct Cooling (ΔT = 25 K) = 141.9543 W/m²
Equals 0.142 kW/m² • 44.9993 BTU/(h·ft²) • 0.00339052 cal/(s·cm²)
SI Heat Flux
141.9543
W/m²
Watts per Square Meter
Solar / Combustion
0.142
kW/m²
Kilowatts per Square Meter
US Building Envelope
44.9993
BTU/(h·ft²)
BTU per Hour Sq. Foot
CGS Thermal
0.00339052
cal/(s·cm²)
Calories per Second Sq. Cm
Meteorology
0.2035
Ly/min
Langley per Minute
Furnace Flux
0.00014195
MW/m²
Megawatts per Square Meter
  1. 1. Normalize Input to SI Base Unit (W/(m²·K)):
    h = 1 CHU/(h·ft²·°C) × 5.67817254 = 5.67817254 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 = (5.67817254 W/(m²·K)) × (25 K) = 141.954313 W/m²
  4. 4. Convert to Standard Engineering Units:
    • W/m²: 141.954313 × 1 = 141.9543 W/m² (Watts per Square Meter) • kW/m²: 141.954313 × 0.001 = 0.142 kW/m² (Kilowatts per Square Meter) • BTU/(h·ft²): 141.954313 × 0.317 = 44.9993 BTU/(h·ft²) (BTU per Hour Sq. Foot) • cal/(s·cm²): 141.954313 × 2.3885 × 10⁻⁵ = 0.00339052 cal/(s·cm²) (Calories per Second Sq. Cm) • Ly/min: 141.954313 × 0.001433 = 0.2035 Ly/min (Langley per Minute) • MW/m²: 141.954313 × 1 × 10⁻⁶ = 0.00014195 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 0.00027777334 btus (it)/second/sq. foot/°f (Btu/(s·ft²·°F)) in 1 chu/hour/sq. foot/°c (CHU/(h·ft²·°C)). To calculate larger amounts manually, simply multiply your total number of chus/hour/sq. foot/°c by the conversion multiplier of 0.00027777334.

The mathematical formula to convert chus/hour/sq. foot/°c to btus (it)/second/sq. foot/°f is: [value] * 0.00027777334 = btus (it)/second/sq. foot/°f. 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 btus (it)/second/sq. foot/°f back to chus/hour/sq. foot/°c, you must divide your starting value by 0.00027777334. Our bidirectional tool automatically computes this inverse equation the moment you type into the btu (it)/second/sq. foot/°f input field.

1 BTU (IT)/second/sq. foot/°F is larger than 1 CHU/hour/sq. foot/°C. Specifically, 1 CHU/hour/sq. foot/°C equals 0.00027777334 btus (it)/second/sq. foot/°f, meaning 1 BTU (IT)/second/sq. foot/°F is 3600.0576 times larger than 1 CHU/hour/sq. foot/°C (a difference of 3.56 orders of magnitude). Expressing measurements in chus/hour/sq. foot/°c requires a larger numerical value to represent the equivalent physical magnitude.

Under standard international measurement guidelines, 1 CHU/hour/sq. foot/°C converts to 0.00027777334 btus (it)/second/sq. foot/°f. Precise numerical conversion factors ensure consistency across laboratory, engineering, and field data.