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Temperature and Power Conversion

06/11/2009 5:56 AM

what is the convertion between temperature and power

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#1

Re: convertion between temperature and power

06/11/2009 6:03 AM

Insufficient information.
There is no direct conversion, except under more specific circumstances.
E.G Power required to raise the temperature of 1cc of water by 1 degree C.

It's a bit like asking whats the conversion between height and time. If you said height of a child vs age there would be some data, but without specifying exactly what you mean it is a meaningless question.

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#2

Re: convertion between temperature and power

06/11/2009 6:58 AM

what is the convertion between temperature and power

Q=mc (Tout - Tin)

Q=Power, m=flow, c=specific gravity of material, mc=Mass Flow Rate for Dynamic System. For Static System, Q= Temperature produced above ambient

It has been 20 some years since applying the Principals of Thermodynamics, primarily usen in the typical steam plan cycle (Rankin Cycle) and ability to read a Mollier Diagram to obtain required information. Far as I can get-Difference in Temperature is the Key, e.b. Basic of the BTU (British Thermal Unit).

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#3

Re: convertion between temperature and power

06/11/2009 7:48 AM

Is this a question on thermodynamics?

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#4

Re: convertion between temperature and power

06/11/2009 8:30 AM

There is a direct relation between temperature and power Energy and that (or the Enthalpy to be precise) is on which all (or most of) the Turbines work.

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#5

Re: Temperature and Power Conversion

06/12/2009 12:12 AM

As the Cat stated, not enough info for a definitive answer. However, another relationship between power and temperature is the noise power in a passive device, such as a resistor, given by:

N (W) = kTB,

where,

N is the noise power in Watts,

k is Boltzmann's constant, which is the ideal gas law constant (R = 8.31 Joules per mole-Kelvin) divided by Avogadro's number (6.02 x 1023 atoms per mole) = 1.38 x 10-23 Joule per Kelvin,

T is absolute temperature in Kelvin (convertible to Celsius by subtracting 273 degrees), and

B is the bandwidth of the device measuring the noise power, in Hertz.

A more recognizable form of this relationship pops up in the calculation of radio receiver sensitivity and noise figures, where

N (dBm) = -174 dBm + 10 * log10(T/298) + 10* log (B) + F (dB),

where,

N is still the noise power, but now in units of dB relative to 1 milliwatt (dBm),

B is still bandwidth, but now expressed as the decibel ratio relative to 1 Hz,

the logarithmic temperature term computes the dependence on temperature, and

F is the radio or device noise figure, which is its degree of imperfection (F > 0 dB).

When the temperature is 298 K (room temperature), the noise power of a perfect device is -174 dBm in a 1 Hz bandwidth. The actual noise power can then be quickly determined by using the above equation to correct for the temperature at which the device will be used, the bandwidth of the device in question, and the noise figure (typically spec'd by the device manufacturer).

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