# How to calculate rate of energy transfer

By | 09.07.2020

Calculating the Transfer of Energy Between Trophic Levels

Q = quantity of energy transferred (kJ, Btu) m = mass of substance (kg, lb) cp = specific heat of the substance (kJ/kgoC, kJ/kgoK, Btu/lb oF) dt = temperature difference (rise or fall) in the . power P, or rate of energy transfer T MW associated with the mechanical wave, is P 5 T MW Dt 5 E l T 5 1 2 mv 2A l T 5 1 2 mv 2A2 a T b P 5 1 2 mv 2A2v () Equation shows that the rate of energy transfer by a sinusoidal wave on a string is proportional to (a) the square of the frequency, (b) the square of the amplitude, and (c) the File Size: KB.

Engineering Rare Exchange is a question and answer site for professionals and how to get mobile banking in sbi of engineering. It only takes a minute to sign up. Connect and share knowledge within a single location that is structured and easy to search. Your C to F conversion is correct for a different question.

The Celsius and Fahrenheit scales have their zero points offset by a factor ohw to 32 F degrees and this has caalculate be allowed for when converting from one measurement caoculate to the other. In this case you wish not to convert between two "scales" but to express the delta difference in degrees F rather than degrees C. So the ratio is relevant and the offset of 32 degrees F between the two scales is irrelevant. Sign up to join this community. The best answers are voted up and rise to the top.

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Is there a step that I am missing? Improve this question. Add a comment. Active Oldest Votes. The Celsius and Fahrenheit scales have their zero points offset by a factor equal to 32 F degrees and this has to be allowed for when converting from one measurement system to the other However In this case you wish not to convert between two "scales" but to express the delta difference in degrees F rather than degrees C.

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The first is that you are taking a snapshot of how this situation started, and you are determining the heat transfer at that instant. That is, you are determining the heat transfer (Q) at the specific time when one end is °C and the aluminum is 10°C. If the energy in the primary consumer (grass) is stated as Kcal, and the rabbit as the secondary consumer received Kcal during energy transfer, to calculate the TLTE in transfer: Calculating the energy transferred and Trophic Level Transfer Efficiency is important in . Watts, kilowatts and kilowatt-hours: Watts (W) are a unit of power used to quantify the rate of energy transfer. It is defined as 1 joule per second. A kilowatt is a multiple of a watt.

Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. It only takes a minute to sign up. Connect and share knowledge within a single location that is structured and easy to search. However how would I calculate the rate of heat transfer if multiple materials were used with different values of k. To explain what I mean here is an example question which you may choose to answer to explain this to me.

A wire 1m long has the first half copper and the second half aluminium. The copper end is at C and the aluminium end and the middle joint is at 10C. The wire has a cross-sectional area of 1cm. Presume the thermal conductivity of aluminium to be and copper The C end is kept at C.

In this problem, you are given some boundary conditions for the wire. Determining the equilibrium temperatures is not what this question is looking for. Instead; this question is a steady state , where the temperatures given are fixed at those locations. You can then solve for the heat transfer at those given temperatures.

The first is that you are taking a snapshot of how this situation started, and you are determining the heat transfer at that instant. Obviously this will only really apply for an instant at the start, and then the ends would begin to move towards equilibrium temperatures. The other interpretation is that there is a heat source and heat sink capable of keeping the temperatures constant.

That is to say that the hot end is being supplied a constant heat Q that it is losing to the aluminum rod, and that the aluminum rod constantly has that heat being taken out, so that all temperatures are maintained.

The second interpretation is how I like to consider steady state. Another example would be if you had a CPU processor running at 65 W for example, you know that it is always giving out 65 W of heat, so it can maintain a steady temperature above room temperature and keep a constant temperature gradient.

In this case it doesn't matter how or why the ends are held at those temperatures, we just accept that they are for the purpose of the exercise of determining heat transfer between the two. Sign up to join this community. The best answers are voted up and rise to the top.

Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. How can I calculate the rate of energy transfer between two materials? Ask Question. Asked 3 years, 11 months ago. Active 3 years, 11 months ago. Viewed 1k times. To explain what I mean here is an example question which you may choose to answer to explain this to me A wire 1m long has the first half copper and the second half aluminium. Improve this question.

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