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Btus (th)/second/square foot to Chus/hour/square foot Converter (Btu (th)/(s·ft²) to CHU/(h·ft²))

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Live Conversion • ISO 80000-5:2019 Certified
1 Btu (th)/second/square foot = 1998.66037838 CHU/hour/square foot
1 Btu (th)/(s·ft²) = 1998.660378 CHU/(h·ft²) • 1 CHU/(h·ft²) = 0.000500335 Btu (th)/(s·ft²)
Btu (th)/second/square foot to CHU/hour/square foot: One Btu (th)/second/square foot is equal to 1998.66037838 Chus/hour/square foot.
Certified Authority Value
1998.66037838
CHU/(h·ft²)
Exact: 1 CHU/(h·ft²) ≡ 0.0005003351299 Btu (th)/(s·ft²)
Btu (th)/(s·ft²)
Btu (th)/(s·ft²)
Swap to CHU/hour/square foot to Btu (th)/second/square foot
Swap to CHU/hour/square foot to Btu (th)/second/square foot
CHU/(h·ft²)
CHU/(h·ft²) 1998.66037838
Quick Values:
Conversion Formula
To convert Btu (th)/second/square foot to CHU/hour/square foot, multiply by 1998.66037838
Btu (th)/(s·ft²) × 1998.66037838 = CHU/(h·ft²)

Calculation: 1 Btu (th)/(s·ft²) × 1998.66037838 = 1998.66037838 CHU/(h·ft²)

Common Btu (th)/second/square foot to CHU/hour/square foot Calculations

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

Tap any row to calculate
Btu (th)/second/square foot to CHU/hour/square foot: Primary Direct Table (15 Steps)
Btu (th)/second/square foot to CHU/hour/square foot Conversion Reference Table
Conversion & Equivalent Value Scientific Notation
0.001 Btu (th)/(s·ft²) 1.99866 CHU/(h·ft²) 1.999 × 10⁰
0.01 Btu (th)/(s·ft²) 19.986604 CHU/(h·ft²) 1.999 × 10¹
0.1 Btu (th)/(s·ft²) 199.866038 CHU/(h·ft²) 1.999 × 10²
0.5 Btu (th)/(s·ft²) 999.330189 CHU/(h·ft²) 9.993 × 10²
1 Btu (th)/(s·ft²) 1998.660378 CHU/(h·ft²) 1.999 × 10³
2 Btu (th)/(s·ft²) 3997.320757 CHU/(h·ft²) 3.997 × 10³
5 Btu (th)/(s·ft²) 9993.301892 CHU/(h·ft²) 9.993 × 10³
10 Btu (th)/(s·ft²) 19986.603784 CHU/(h·ft²) 1.999 × 10⁴
20 Btu (th)/(s·ft²) 39973.207568 CHU/(h·ft²) 3.997 × 10⁴
25 Btu (th)/(s·ft²) 49966.50946 CHU/(h·ft²) 4.997 × 10⁴
50 Btu (th)/(s·ft²) 99933.018919 CHU/(h·ft²) 9.993 × 10⁴
100 Btu (th)/(s·ft²) 199866.037838 CHU/(h·ft²) 1.999 × 10⁵
250 Btu (th)/(s·ft²) 499665.094595 CHU/(h·ft²) 4.997 × 10⁵
500 Btu (th)/(s·ft²) 999330.18919 CHU/(h·ft²) 9.993 × 10⁵
1000 Btu (th)/(s·ft²) 1998660.378381 CHU/(h·ft²) 1.999 × 10⁶
CHU/hour/square foot to Btu (th)/second/square foot: Reciprocal Summary
CHU/hour/square foot to Btu (th)/second/square foot Conversion Reference Table
Reciprocal & Equivalent Value Scientific Notation
1 CHU/(h·ft²) 0.000500335 Btu (th)/(s·ft²) 5.003 × 10⁻⁴
5 CHU/(h·ft²) 0.00250168 Btu (th)/(s·ft²) 2.502 × 10⁻³
10 CHU/(h·ft²) 0.00500335 Btu (th)/(s·ft²) 5.003 × 10⁻³
50 CHU/(h·ft²) 0.0250168 Btu (th)/(s·ft²) 2.502 × 10⁻²
100 CHU/(h·ft²) 0.0500335 Btu (th)/(s·ft²) 5.003 × 10⁻²
View Complete 15-Row CHU/hour/square foot to Btu (th)/second/square foot 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 (th)/second/square foot (Btu (th)/(s·ft²)) and CHU/hour/square foot (CHU/(h·ft²)):

Btu (th)/second/square foot References:

  • Solid rocket motor nozzle graphite throat erosion heat flux 75 Btu (th)/(s·ft²)

CHU/hour/square foot References:

  • British historical boiler combustion heat transfer flux 150 CHU/(h·ft²)

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

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

How to Convert Btu (th)/second/square foot to CHU/hour/square foot

Converting Btu (th)/second/square foot (Btu (th)/(s·ft²)) to CHU/hour/square foot (CHU/(h·ft²)) is a core calculation in Heat Flux Density, which measures the rate of thermal energy transfer radiating or conducting through a unit area per second. 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 (th)/second/square foot equals 1998.660378 CHU/hour/square foot, while 1 CHU/(h·ft²) equals 0.000500335 Btu (th)/(s·ft²).

Direct Factor1 Btu (th)/(s·ft²) = 1998.660378 CHU/(h·ft²)
Inverse Ratio1 CHU/(h·ft²) = 0.000500335 Btu (th)/(s·ft²)
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 (W/m²)) 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 (th)/(s·ft²) = 11348.931795 watt per square meter (W/m²)
2. Target SI Bridge (ktarget):1 CHU/(h·ft²) = 5.678269 watt per square meter (W/m²)
Step-by-step substitution for Btu (th)/second/square foot → CHU/hour/square foot:V(CHU/(h·ft²)) = V(Btu (th)/(s·ft²)) × ( 11348.931795 / 5.678269 ) = V(Btu (th)/(s·ft²)) × 1998.660378
Mathematical FormulaValue in CHU/hour/square foot = Value in Btu (th)/second/square foot × 1998.66037838Direct computational formula applied for standard conversion.
Worked Example

Evaluating an input of 120 Btu (th)/second/square foot (Btu (th)/(s·ft²)) produces 239839.245406 CHU/hour/square foot (CHU/(h·ft²)). In heavy-duty utility and industrial workloads, 10000 Btu (th)/(s·ft²) equals 1.99866 × 10⁷ CHU/(h·ft²).

Inverse check: 1 CHU/(h·ft²) = 0.000500335 Btu (th)/(s·ft²).

Understanding Btu (th)/second/square foot and CHU/hour/square foot

Btu (th)/second/square foot

Btu (th)/(s·ft²)
Imperial / US

A Btu (th)/second/square foot (Btu (th)/(s·ft²)) is an imperial and US customary unit for heat flux density.

Applications & Practical Context

In practical heat flux density terms, a solid rocket motor nozzle graphite throat erosion heat flux equals 75 Btu (th)/(s·ft²).

Physical Setup

A physical magnitude of 1 Btu (th)/(s·ft²) corresponds to 11348.931795 W/m² in standard SI measurement.

Conversion to SI Unit: watt per square meter (W/m²)
1 Btu (th)/(s·ft²) = 11348.931795 W/m²

CHU/hour/square foot

CHU/(h·ft²)
Imperial / US

A CHU/hour/square foot (CHU/(h·ft²)) is an imperial and US customary unit for heat flux density.

Applications & Practical Context

In practical heat flux density terms, a British historical boiler combustion heat transfer flux equals 150 CHU/(h·ft²).

Physical Setup

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

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

Domain Metrology & Engineering Applications

Governing Law & Equation

Thermal Transmission Flux (q = Q̇ / A)

Measurement Instrumentation

Rigorously quantified in laboratory and field settings using Schmidt-Boelter heat flux gauges, differential thermopile foil transducers, and calibrated Gardon radiant gauges.

Primary Industry Sectors

Applied across rocket nozzle combustion chamber analysis, fire resistance testing (ASTM E119), furnace wall heat loss auditing, and hypersonic aerothermal design under international metrology standard ISO 80000-5:2019, ASME PTC 19.3.

Institutional Metrology & Standard Authority:

Formulas, conversion coefficients, and base definitions on this page strictly adhere to the ISO 80000-5:2019, ASME PTC 19.3 and the BIPM SI Brochure (9th Edition). Governed by Thermal Transmission Flux (q = Q̇ / A) under ISO 80000 dimensional vector [M T⁻³].

Multi-Variable Engineering Bridge Thermal Radiation & Power Dissipation

Heat Flux Density to Total Thermal Power Bridge (Watts • Kilowatts • Megawatts • BTU/h • Horsepower)

Calculate total continuous heat dissipation power P = q" × A across surface barriers and exchangers, bridging heat flux density [M T⁻³] with thermal power [M L² T⁻³].

P = q" × A
Vector: [W/m²] × [m²] → [W]
Live Calculated Bridge Equivalent:
1 Btu (th)/(s·ft²) at Industrial Hydronic Radiator Panel (8 m²) = 90791.4544 W
Equals 90.7915 kW • 0.0907915 MW • 121.7533 hp
SI Power
90791.4544
W
Watts
Grid / Utility
90.7915
kW
Kilowatts
Power Plant
0.0907915
MW
Megawatts
Mechanical Rating
121.7533
hp
Horsepower (Mechanical)
Metric Horsepower
123.442
PS
Metric Horsepower (PS)
HVAC Thermal Rating
309793.3
BTU/h
BTU per Hour
  1. 1. Normalize Input to SI Base Unit (W/m²):
    q" = 1 Btu (th)/(s·ft²) × 11348.93179479 = 11348.93179479 W/m²
  2. 2. Apply Engineering Parameter (A):
    Selected condition: Industrial Hydronic Radiator Panel (8 m²) at A = 8 m²
  3. 3. Execute Governing Physical Law in SI Units:
    P = q" × A = (11348.93179479 W/m²) × (8 m²) = 90791.454358 W
  4. 4. Convert to Standard Engineering Units:
    • W: 90791.454358 × 1 = 90791.4544 W (Watts) • kW: 90791.454358 × 0.001 = 90.7915 kW (Kilowatts) • MW: 90791.454358 × 1 × 10⁻⁶ = 0.0907915 MW (Megawatts) • hp: 90791.454358 × 0.001341 = 121.7533 hp (Horsepower (Mechanical)) • PS: 90791.454358 × 0.00136 = 123.442 PS (Metric Horsepower (PS)) • BTU/h: 90791.454358 × 3.4121 = 309793.3 BTU/h (BTU per Hour)
Explore Full Power Converter →
Engineering Substance / Operating Standard Parameter Value (m²) Reference State / Condition Typical Industrial & Engineering Application
Residential Window Glazing (4 m²) 4 4.0 m² Double-pane exterior window glass aperture
Industrial Hydronic Radiator Panel (8 m²) 8 8.0 m² Convective space heating radiator surface
Shell & Tube Heat Exchanger (50 m²) 50 50.0 m² Industrial process fluid cooling bundle
Power Boiler Waterwall (200 m²) 200 200.0 m² Thermal power plant steam generator wall
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Frequently Asked Questions

There are exactly 1998.66037838 chus/hour/square foot (CHU/(h·ft²)) in 1 btu (th)/second/square foot (Btu (th)/(s·ft²)). To calculate larger amounts manually, simply multiply your total number of btus (th)/second/square foot by the conversion multiplier of 1998.66037838.

The mathematical formula to convert btus (th)/second/square foot to chus/hour/square foot is: [value] * 1998.66037838 = chus/hour/square foot. 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 back to btus (th)/second/square foot, you must divide your starting value by 1998.66037838. Our bidirectional tool automatically computes this inverse equation the moment you type into the chu/hour/square foot input field.

1 Btu (th)/second/square foot is larger than 1 CHU/hour/square foot. Specifically, 1 Btu (th)/second/square foot equals exactly 1998.66037838 chus/hour/square foot, making it 1998.6604 times larger (a difference of 3.30 orders of magnitude). Therefore, quantities expressed in chus/hour/square foot require a larger numerical value to represent the same physical amount.

Under standard international measurement guidelines, 1 Btu (th)/second/square foot converts to 1998.66037838 chus/hour/square foot. Precise numerical conversion factors ensure consistency across laboratory, engineering, and field data.