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Kilocalories (it)/hour/ft²/°C to Chus/hour/sq. foot/°C Converter (kcal/(h·ft²·°C) to CHU/(h·ft²·°C))

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Live Conversion • ISO 80000-5:2019 Certified
1 Kilocalorie (IT)/hour/ft²/°C = 2.20455951 CHU/hour/sq. foot/°C
1 kcal/(h·ft²·°C) = 2.20456 CHU/(h·ft²·°C) • 1 CHU/(h·ft²·°C) = 0.453605 kcal/(h·ft²·°C)
Kilocalorie (IT)/hour/ft²/°C to CHU/hour/sq. foot/°C: One Kilocalorie (IT)/hour/ft²/°C is equal to 2.20455951 Chus/hour/sq. foot/°C.
Certified Authority Value
2.20455951
CHU/(h·ft²·°C)
Exact: 1 CHU/(h·ft²·°C) ≡ 0.4536053557 kcal/(h·ft²·°C)
kcal/(h·ft²·°C)
kcal/(h·ft²·°C)
Swap to CHU/hour/sq. foot/°C to Kilocalorie (IT)/hour/ft²/°C
Swap to CHU/hour/sq. foot/°C to Kilocalorie (IT)/hour/ft²/°C
CHU/(h·ft²·°C)
CHU/(h·ft²·°C) 2.20455951
Quick Values:
Conversion Formula
To convert Kilocalorie (IT)/hour/ft²/°C to CHU/hour/sq. foot/°C, multiply by 2.20455951
kcal/(h·ft²·°C) × 2.20455951 = CHU/(h·ft²·°C)

Calculation: 1 kcal/(h·ft²·°C) × 2.20455951 = 2.20455951 CHU/(h·ft²·°C)

Common Kilocalorie (IT)/hour/ft²/°C to CHU/hour/sq. foot/°C Calculations

Quick-lookup reference table showing calculated equivalents for standard increments between Kilocalorie (IT)/hour/ft²/°C (kcal/(h·ft²·°C)) and CHU/hour/sq. foot/°C (CHU/(h·ft²·°C)).

Tap any row to calculate
Kilocalorie (IT)/hour/ft²/°C to CHU/hour/sq. foot/°C: Primary Direct Table (15 Steps)
Kilocalorie (IT)/hour/ft²/°C to CHU/hour/sq. foot/°C Conversion Reference Table
Conversion & Equivalent Value Scientific Notation
0.001 kcal/(h·ft²·°C) 0.00220456 CHU/(h·ft²·°C) 2.205 × 10⁻³
0.01 kcal/(h·ft²·°C) 0.0220456 CHU/(h·ft²·°C) 2.205 × 10⁻²
0.1 kcal/(h·ft²·°C) 0.220456 CHU/(h·ft²·°C) 2.205 × 10⁻¹
0.5 kcal/(h·ft²·°C) 1.10228 CHU/(h·ft²·°C) 1.102 × 10⁰
1 kcal/(h·ft²·°C) 2.20456 CHU/(h·ft²·°C) 2.205 × 10⁰
2 kcal/(h·ft²·°C) 4.409119 CHU/(h·ft²·°C) 4.409 × 10⁰
5 kcal/(h·ft²·°C) 11.022798 CHU/(h·ft²·°C) 1.102 × 10¹
10 kcal/(h·ft²·°C) 22.045595 CHU/(h·ft²·°C) 2.205 × 10¹
20 kcal/(h·ft²·°C) 44.09119 CHU/(h·ft²·°C) 4.409 × 10¹
25 kcal/(h·ft²·°C) 55.113988 CHU/(h·ft²·°C) 5.511 × 10¹
50 kcal/(h·ft²·°C) 110.227975 CHU/(h·ft²·°C) 1.102 × 10²
100 kcal/(h·ft²·°C) 220.455951 CHU/(h·ft²·°C) 2.205 × 10²
250 kcal/(h·ft²·°C) 551.139877 CHU/(h·ft²·°C) 5.511 × 10²
500 kcal/(h·ft²·°C) 1102.279754 CHU/(h·ft²·°C) 1.102 × 10³
1000 kcal/(h·ft²·°C) 2204.559509 CHU/(h·ft²·°C) 2.205 × 10³
CHU/hour/sq. foot/°C to Kilocalorie (IT)/hour/ft²/°C: Reciprocal Summary
CHU/hour/sq. foot/°C to Kilocalorie (IT)/hour/ft²/°C Conversion Reference Table
Reciprocal & Equivalent Value Scientific Notation
1 CHU/(h·ft²·°C) 0.453605 kcal/(h·ft²·°C) 4.536 × 10⁻¹
5 CHU/(h·ft²·°C) 2.268027 kcal/(h·ft²·°C) 2.268 × 10⁰
10 CHU/(h·ft²·°C) 4.536054 kcal/(h·ft²·°C) 4.536 × 10⁰
50 CHU/(h·ft²·°C) 22.680268 kcal/(h·ft²·°C) 2.268 × 10¹
100 CHU/(h·ft²·°C) 45.360536 kcal/(h·ft²·°C) 4.536 × 10¹
View Complete 15-Row CHU/hour/sq. foot/°C to Kilocalorie (IT)/hour/ft²/°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 Kilocalorie (IT)/hour/ft²/°C (kcal/(h·ft²·°C)) and CHU/hour/sq. foot/°C (CHU/(h·ft²·°C)):

Kilocalorie (IT)/hour/ft²/°C References:

  • Stationary ambient air natural free convection on vertical wall 0.399429 kcal/(h·ft²·°C)
  • Forced air breeze blowing across automotive cooling radiator 3.9943 kcal/(h·ft²·°C)
  • Liquid water forced circulation inside heat exchanger pipe 239.66 kcal/(h·ft²·°C)
  • Nucleate boiling heat transfer in pressurized steam boiler tube 1198.29 kcal/(h·ft²·°C)

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)

Tap any benchmark above to automatically calculate its exact equivalent in CHU/hour/sq. 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 Kilocalorie (IT)/hour/ft²/°C to CHU/hour/sq. foot/°C

Converting Kilocalorie (IT)/hour/ft²/°C (kcal/(h·ft²·°C)) to CHU/hour/sq. 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 Kilocalorie (IT)/hour/ft²/°C equals 2.20456 CHU/hour/sq. foot/°C, while 1 CHU/(h·ft²·°C) equals 0.453605 kcal/(h·ft²·°C).

Direct Factor1 kcal/(h·ft²·°C) = 2.20456 CHU/(h·ft²·°C)
Inverse Ratio1 CHU/(h·ft²·°C) = 0.453605 kcal/(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 kcal/(h·ft²·°C) = 12.517869 watt per square meter kelvin (W/(m²·K))
2. Target SI Bridge (ktarget):1 CHU/(h·ft²·°C) = 5.678173 watt per square meter kelvin (W/(m²·K))
Step-by-step substitution for Kilocalorie (IT)/hour/ft²/°C → CHU/hour/sq. foot/°C:V(CHU/(h·ft²·°C)) = V(kcal/(h·ft²·°C)) × ( 12.517869 / 5.678173 ) = V(kcal/(h·ft²·°C)) × 2.20456
Mathematical FormulaValue in CHU/hour/sq. foot/°C = Value in Kilocalorie (IT)/hour/ft²/°C × 2.20455951Direct computational formula applied for standard conversion.
Worked Example

To convert 2.5 Kilocalorie (IT)/hour/ft²/°C (kcal/(h·ft²·°C)) to CHU/hour/sq. foot/°C (CHU/(h·ft²·°C)): multiply 2.5 by 2.20456 to get 5.511399 CHU/(h·ft²·°C). At an industrial engineering scale, 10000 kcal/(h·ft²·°C) converts to 22045.595087 CHU/(h·ft²·°C).

Inverse check: 1 CHU/(h·ft²·°C) = 0.453605 kcal/(h·ft²·°C).

Understanding Kilocalorie (IT)/hour/ft²/°C and CHU/hour/sq. foot/°C

Kilocalorie (IT)/hour/ft²/°C

kcal/(h·ft²·°C)
SI Multiple

A Kilocalorie (IT)/hour/ft²/°C (kcal/(h·ft²·°C)) is a decimal multiple of the SI-derived 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 0.399429 kcal/(h·ft²·°C), a forced air breeze blowing across automotive cooling radiator equals 3.9943 kcal/(h·ft²·°C), a liquid water forced circulation inside heat exchanger pipe equals 239.66 kcal/(h·ft²·°C).

Physical Setup

A physical magnitude of 1 kcal/(h·ft²·°C) corresponds to 12.517869 W/(m²·K) in standard SI measurement.

Conversion to SI Unit: watt per square meter kelvin (W/(m²·K))
1 kcal/(h·ft²·°C) = 12.517869 W/(m²·K)

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)

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 kcal/(h·ft²·°C) at Forced Air Duct Cooling (ΔT = 25 K) = 312.9467 W/m²
Equals 0.3129 kW/m² • 99.2036 BTU/(h·ft²) • 0.0074746 cal/(s·cm²)
SI Heat Flux
312.9467
W/m²
Watts per Square Meter
Solar / Combustion
0.3129
kW/m²
Kilowatts per Square Meter
US Building Envelope
99.2036
BTU/(h·ft²)
BTU per Hour Sq. Foot
CGS Thermal
0.0074746
cal/(s·cm²)
Calories per Second Sq. Cm
Meteorology
0.4486
Ly/min
Langley per Minute
Furnace Flux
0.00031295
MW/m²
Megawatts per Square Meter
  1. 1. Normalize Input to SI Base Unit (W/(m²·K)):
    h = 1 kcal/(h·ft²·°C) × 12.51786926 = 12.51786926 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 = (12.51786926 W/(m²·K)) × (25 K) = 312.946731 W/m²
  4. 4. Convert to Standard Engineering Units:
    • W/m²: 312.946731 × 1 = 312.9467 W/m² (Watts per Square Meter) • kW/m²: 312.946731 × 0.001 = 0.3129 kW/m² (Kilowatts per Square Meter) • BTU/(h·ft²): 312.946731 × 0.317 = 99.2036 BTU/(h·ft²) (BTU per Hour Sq. Foot) • cal/(s·cm²): 312.946731 × 2.3885 × 10⁻⁵ = 0.0074746 cal/(s·cm²) (Calories per Second Sq. Cm) • Ly/min: 312.946731 × 0.001433 = 0.4486 Ly/min (Langley per Minute) • MW/m²: 312.946731 × 1 × 10⁻⁶ = 0.00031295 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 2.20455951 chus/hour/sq. foot/°c (CHU/(h·ft²·°C)) in 1 kilocalorie (it)/hour/ft²/°c (kcal/(h·ft²·°C)). To calculate larger amounts manually, simply multiply your total number of kilocalories (it)/hour/ft²/°c by the conversion multiplier of 2.20455951.

The mathematical formula to convert kilocalories (it)/hour/ft²/°c to chus/hour/sq. foot/°c is: [value] * 2.20455951 = chus/hour/sq. 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/sq. foot/°c back to kilocalories (it)/hour/ft²/°c, you must divide your starting value by 2.20455951. Our bidirectional tool automatically computes this inverse equation the moment you type into the chu/hour/sq. foot/°c input field.

1 Kilocalorie (IT)/hour/ft²/°C is larger than 1 CHU/hour/sq. foot/°C. Specifically, 1 Kilocalorie (IT)/hour/ft²/°C equals exactly 2.20455951 chus/hour/sq. foot/°c, making it 2.2046 times larger (a difference of 0.34 orders of magnitude). Therefore, quantities expressed in chus/hour/sq. foot/°c require a larger numerical value to represent the same physical amount.

Under standard international measurement guidelines, 1 Kilocalorie (IT)/hour/ft²/°C converts to 2.20455951 chus/hour/sq. foot/°c. Precise numerical conversion factors ensure consistency across laboratory, engineering, and field data.