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unit

Heat flux

thermal flux

 

system of units:   SI;
statute:   derived unit (with a special name);
name the value:   Φ;
unit name:   watt;
symbol unit:   W;
relationship of definition:   Φ = E/t;
dimension:   M L2 T-3;
expression in other units:   cal/h, Btu/h;

Definition

The heat flux or thermal flux is the physical measure, which defines the amount of heat that passes through an area relative to the time in which this process occurs.

1 watt is the heat flux or thermal flux equivalent to a mechanical power of 1 watt or 1 joule per second.

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Units of measurement

namesymbol value in SI unit:
W
note
1 joule per hourJ/h≈ 2.(7) × 10-4 
1 joule per minuteJ/min≈ 0.01(6) 
1 joule per secondJ/s= 1 
1 BtuIT per hourBtuIT/h≈ 0.293 071 1(7), (8)
1 BtuIT per minuteBtuIT/min≈ 17.584 266(7), (8)
1 BtuIT per secondBtuIT/s≈ 1 055.056(7), (8)
1 Btuth per hourBtuth/h≈ 0.292 875 1(7), (9)
1 Btuth per minuteBtuth/min≈ 17.572 506(7), (9)
1 Btuth per secondBtuth/s≈ 1 054.350(7), (9)
1 calorieIT per hourcalIT/h≈ 0.001 163(8)
1 calorieIT per minutecalIT/min≈ 0.069 78(8)
1 calorieIT per secondcalIT/s≈ 4.186 8(8)
1 calorieth per hourcalth/h≈ 0.001 16(2)(9)
1 calorieth per minutecalth/min≈ 0.069 7(3)(9)
1 calorieth per secondcalth/s= 4.184(9)
1 ton of refrigeration ≈ 3 516.853(10)
for mechanics, electricity
1 foot pound-force per hourft lbf/h≈ 3.766 161 × 10-4 
1 foot pound-force per minutft lbf/min≈ 0.022 596 
1 foot pound-force per secondft lbf/s≈ 1.355 818 
1 horsepowerHp≈ 745.699(9)(1)
1 horsepowerHpth≈ 9 809.50(2)
1 horsepowerHpel= 746(3)
1 horsepowerHpm≈ 735.498 8(4)
1 horsepowerHpUK≈ 745.70(5)
1 horsepowerHpH2O≈ 746.043(6)
1 erg per seconderg/s= 1.0 
1 gram-force metre per secondgf m/s≈ 9.81 

Note:

(1) - 550 ft lbf/s;

(2) - termic;

(3) - electric;

(4) - metric;

(5) - imperial, UK;

(6) - hidraulic;

(7) - Btu - British thermal unit;

(8) - IT - common unit, international;

(9) - th - thermochemical unit;

(10) - 12 000 BtuIT/h.

 


See other pages:

mechanics: power