Search for tag: "heat"

12g Example of throttle and HX

Here I go through the two examples of a throttle and a heat exchanger. I look at the energy equation, and solve that. Then I look at the rate of entropy production. It is positive in both cases…

From  Stephen Beck on April 15th, 2021 0 likes 20 plays 0  

10c Closed system examples

Here I go through two examples of the first law of thermodynamics for closed systems. The first on e is a polutropic process where I calculte the final conditions and the heat and work. The second…

From  Stephen Beck on March 2nd, 2021 0 likes 131 plays 0  

13a Heat engines

Here I introduce the concept of the heat engine. I define the source and the sink. I then use the first and second laws of thermodynamics to derive the Carnot efficiency. I then point out that the…

From  Stephen Beck on February 4th, 2021 0 likes 150 plays 0  

11b Introduction to the second law 2

Here I describe what is hapenning in the two videos of the kid falling off the bike and the kid falling off the bike in reverse. I describe the natural order of things beign that order decreases and…

From  Stephen Beck on January 19th, 2021 0 likes 150 plays 0  

11a Introduction to the second law

Here I show a series of irreversible processes. I discuss how in each case high quality energy is converted into lower quality energy and that this is inevitable. I introduce the concept of entropy.

From  Stephen Beck on January 19th, 2021 0 likes 152 plays 0  

7a Overview of the Thermodynamics course

Here I introduce the course, and inform student how they should be studying. I show the week by week plan . Then I go through the syllabus and pick up some of the fundamental concepts I will be…

From  Stephen Beck on January 18th, 2021 0 likes 221 plays 0  

14c Brayton cycle with inefficiencies

Here I introduce two ineffinciencies into the ideal Brayton cycle I described in the previous lecture. Firstly, the effect of friction on the turbine and compressore. Then, I look at the effect of…

From  Stephen Beck on January 18th, 2021 0 likes 134 plays 0  

14b Example of Brayton cycle

Here I go through an example of a Brayton cycle. I show that, using previous knowledge of devices, we can calculte the heat and work terms for the three devices and therefore work out the efficiency…

From  Stephen Beck on January 18th, 2021 0 likes 149 plays 0  

13b Power cycles and diagrams

Here I show that the area under the PV and TS diagrams are the work produced in a cycle. I show (again that the efficiency is the ratio between work out and heat in, but here I do it graphcally.

From  Stephen Beck on January 13th, 2021 0 likes 129 plays 0  

10e Open system examples

Here I go through 2 examples of use of the SFEE for ideal gases. The fiart on is a turbine and the second one is an isothermal compressor. I show how to solve tese and what they mean.

From  Stephen Beck on January 11th, 2021 0 likes 143 plays 0  

12f Heat exchangers

I introduce heat exchangers. Then I look at the heat transfer in them from the point of the first law of Thermodynamics. I then explain the irreversibility in a heat exchanger in terms of entropy. I…

From  Stephen Beck on December 11th, 2019 0 likes 254 plays 0  

9c Specific Heat Capacities

Here I introduce isothermal processes. I then derive the specific heat capacities at constant volume and pressure. I reinforce that these can always be used to substiture for temperature. Finally I…

From  Stephen Beck on August 29th, 2019 0 likes 377 plays 0  

10b Polytropic processes

Here I show that the polytropic process is a good way of describing changes in condition for closed systems with ideal gasses. I look at different values of the exponent, n. Then I calculate some at…

From  Stephen Beck on July 4th, 2019 0 likes 371 plays 0  

9a The energy equation

Here I introduce the first law of thermodynamics by thinking about the types of energy that we will deal with. I then shpow that these are interchangeable. Finally, I deduce the energy equation.

From  Stephen Beck on July 3rd, 2019 0 likes 437 plays 0