Skip to main content
0 results ↑ ↓ navigate, ↵ select

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

Rate this converter 0 of 0 ratings
Instant calculation with 0ms overhead
Popular Converters
Live Conversion • ISO 80000-5:2019 Certified
1 CHU/hour/sq. foot/°C = 0.00027795919 BTU (th)/second/sq. foot/°F
1 CHU/(h·ft²·°C) = 0.000277959 Btu (th)/(s·ft²·°F) • 1 Btu (th)/(s·ft²·°F) = 3597.650453 CHU/(h·ft²·°C)
CHU/hour/sq. foot/°C to BTU (th)/second/sq. foot/°F: One CHU/hour/sq. foot/°C is equal to 0.00027795919 Btus (th)/second/sq. foot/°F.
Certified Authority Value
0.00027796
Btu (th)/(s·ft²·°F)
Exact: 1 Btu (th)/(s·ft²·°F) ≡ 3597.65045304 CHU/(h·ft²·°C)
CHU/(h·ft²·°C)
CHU/(h·ft²·°C)
Swap to BTU (th)/second/sq. foot/°F to CHU/hour/sq. foot/°C
Swap to BTU (th)/second/sq. foot/°F to CHU/hour/sq. foot/°C
Btu (th)/(s·ft²·°F)
Btu (th)/(s·ft²·°F) 0.00027795919
Quick Values:
Conversion Formula
To convert CHU/hour/sq. foot/°C to BTU (th)/second/sq. foot/°F, multiply by 0.00027795919
CHU/(h·ft²·°C) × 0.00027795919 = Btu (th)/(s·ft²·°F)

Calculation: 1 CHU/(h·ft²·°C) × 0.00027795919 = 0.00027795919 Btu (th)/(s·ft²·°F)

Common CHU/hour/sq. foot/°C to BTU (th)/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 (th)/second/sq. foot/°F (Btu (th)/(s·ft²·°F)).

Tap any row to calculate
CHU/hour/sq. foot/°C to BTU (th)/second/sq. foot/°F: Primary Direct Table (15 Steps)
CHU/hour/sq. foot/°C to BTU (th)/second/sq. foot/°F Conversion Reference Table
Conversion & Equivalent Value Scientific Notation
0.001 CHU/(h·ft²·°C) 2.779592 × 10⁻⁷ Btu (th)/(s·ft²·°F) 2.78 × 10⁻⁷
0.01 CHU/(h·ft²·°C) 2.779592 × 10⁻⁶ Btu (th)/(s·ft²·°F) 2.78 × 10⁻⁶
0.1 CHU/(h·ft²·°C) 2.779592 × 10⁻⁵ Btu (th)/(s·ft²·°F) 2.78 × 10⁻⁵
0.5 CHU/(h·ft²·°C) 0.00013898 Btu (th)/(s·ft²·°F) 1.39 × 10⁻⁴
1 CHU/(h·ft²·°C) 0.000277959 Btu (th)/(s·ft²·°F) 2.78 × 10⁻⁴
2 CHU/(h·ft²·°C) 0.000555918 Btu (th)/(s·ft²·°F) 5.559 × 10⁻⁴
5 CHU/(h·ft²·°C) 0.0013898 Btu (th)/(s·ft²·°F) 1.39 × 10⁻³
10 CHU/(h·ft²·°C) 0.00277959 Btu (th)/(s·ft²·°F) 2.78 × 10⁻³
20 CHU/(h·ft²·°C) 0.00555918 Btu (th)/(s·ft²·°F) 5.559 × 10⁻³
25 CHU/(h·ft²·°C) 0.00694898 Btu (th)/(s·ft²·°F) 6.949 × 10⁻³
50 CHU/(h·ft²·°C) 0.013898 Btu (th)/(s·ft²·°F) 1.39 × 10⁻²
100 CHU/(h·ft²·°C) 0.0277959 Btu (th)/(s·ft²·°F) 2.78 × 10⁻²
250 CHU/(h·ft²·°C) 0.0694898 Btu (th)/(s·ft²·°F) 6.949 × 10⁻²
500 CHU/(h·ft²·°C) 0.13898 Btu (th)/(s·ft²·°F) 1.39 × 10⁻¹
1000 CHU/(h·ft²·°C) 0.277959 Btu (th)/(s·ft²·°F) 2.78 × 10⁻¹
BTU (th)/second/sq. foot/°F to CHU/hour/sq. foot/°C: Reciprocal Summary
BTU (th)/second/sq. foot/°F to CHU/hour/sq. foot/°C Conversion Reference Table
Reciprocal & Equivalent Value Scientific Notation
1 Btu (th)/(s·ft²·°F) 3597.650453 CHU/(h·ft²·°C) 3.598 × 10³
5 Btu (th)/(s·ft²·°F) 17988.252265 CHU/(h·ft²·°C) 1.799 × 10⁴
10 Btu (th)/(s·ft²·°F) 35976.50453 CHU/(h·ft²·°C) 3.598 × 10⁴
50 Btu (th)/(s·ft²·°F) 179882.522652 CHU/(h·ft²·°C) 1.799 × 10⁵
100 Btu (th)/(s·ft²·°F) 359765.045304 CHU/(h·ft²·°C) 3.598 × 10⁵
View Complete 15-Row BTU (th)/second/sq. foot/°F to CHU/hour/sq. foot/°C Table

Real-World Context & Everyday Benchmarks

Tap to load into converter

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 (th)/second/sq. foot/°F (Btu (th)/(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 (th)/second/sq. foot/°F References:

  • Stationary ambient air natural free convection on vertical wall 0.000245 Btu (th)/(s·ft²·°F)
  • Forced air breeze blowing across automotive cooling radiator 0.002448 Btu (th)/(s·ft²·°F)
  • Liquid water forced circulation inside heat exchanger pipe 0.146857 Btu (th)/(s·ft²·°F)
  • Nucleate boiling heat transfer in pressurized steam boiler tube 0.734283 Btu (th)/(s·ft²·°F)

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

Converting CHU/hour/sq. foot/°C (CHU/(h·ft²·°C)) to BTU (th)/second/sq. foot/°F (Btu (th)/(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 0.000277959 BTU (th)/second/sq. foot/°F, while 1 Btu (th)/(s·ft²·°F) equals 3597.650453 CHU/(h·ft²·°C).

Direct Factor1 CHU/(h·ft²·°C) = 0.000277959 Btu (th)/(s·ft²·°F)
Inverse Ratio1 Btu (th)/(s·ft²·°F) = 3597.650453 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 (th)/(s·ft²·°F) = 20428.08 watt per square meter kelvin (W/(m²·K))
Step-by-step substitution for CHU/hour/sq. foot/°C → BTU (th)/second/sq. foot/°F:V(Btu (th)/(s·ft²·°F)) = V(CHU/(h·ft²·°C)) × ( 5.678173 / 20428.08 ) = V(CHU/(h·ft²·°C)) × 0.000277959
Mathematical FormulaValue in BTU (th)/second/sq. foot/°F = Value in CHU/hour/sq. foot/°C × 0.00027795919Direct computational formula applied for standard conversion.
Worked Example

For an engineering input of 36 CHU/(h·ft²·°C), applying the conversion factor yields exactly 0.0100065 Btu (th)/(s·ft²·°F). At larger operational scale, 240 CHU/hour/sq. foot/°C corresponds to 0.0667102 Btu (th)/(s·ft²·°F).

Inverse check: 1 Btu (th)/(s·ft²·°F) = 3597.650453 CHU/(h·ft²·°C).

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

Btu (th)/(s·ft²·°F)
Imperial / US

A BTU (th)/second/sq. foot/°F (Btu (th)/(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 (th)/(s·ft²·°F), a forced air breeze blowing across automotive cooling radiator equals 0.002448 Btu (th)/(s·ft²·°F), a liquid water forced circulation inside heat exchanger pipe equals 0.146857 Btu (th)/(s·ft²·°F).

Physical Setup

A physical magnitude of 1 Btu (th)/(s·ft²·°F) corresponds to 20428.08 W/(m²·K) in standard SI measurement.

Conversion to SI Unit: watt per square meter kelvin (W/(m²·K))
1 Btu (th)/(s·ft²·°F) = 20428.08 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
Embed
Need this CHU/hour/sq. foot/°C to BTU (th)/second/sq. foot/°F calculator on your website, lab portal, or research blog?
Free HTML Widget 100% Responsive Zero Cookie Tracking
Notice a calculation discrepancy, rounding error, or glitch?
Help us maintain 100% scientific precision and report any issues directly to engineering.

Frequently Asked Questions

There are exactly 0.00027795919 btus (th)/second/sq. foot/°f (Btu (th)/(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 0.00027795919.

The mathematical formula to convert chus/hour/sq. foot/°c to btus (th)/second/sq. foot/°f is: [value] * 0.00027795919 = btus (th)/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 (th)/second/sq. foot/°f back to chus/hour/sq. foot/°c, you must divide your starting value by 0.00027795919. Our bidirectional tool automatically computes this inverse equation the moment you type into the btu (th)/second/sq. foot/°f input field.

1 BTU (th)/second/sq. foot/°F is larger than 1 CHU/hour/sq. foot/°C. Specifically, 1 CHU/hour/sq. foot/°C equals 0.00027795919 btus (th)/second/sq. foot/°f, meaning 1 BTU (th)/second/sq. foot/°F is 3597.6505 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 0.00027795919 btus (th)/second/sq. foot/°f. Precise numerical conversion factors ensure consistency across laboratory, engineering, and field data.