Finding the energy dissipated per cycle in a Stirling Engine

In summary, the conversation discusses an experiment to measure the efficiency of a Stirling Engine. The variables mentioned include R, UR, n, T1, and T2. The power dissipation (PR) and energy dissipation per cycle (WR) need to be calculated for the lab report. At R = 500Ω, the recorded values are UR = -3.68V, n = 494 cycles min-1, T1 = 150°C and T2 = 63.2°C. The equation PR = V2/R is used to calculate power dissipation, and it was determined to be 0.027 W. However, finding WR has proven to be more difficult and the conversation mentions the potential for
  • #1
TheBigDig
65
2
1.Recently, we performed an experiment to measure the efficiency of the Stirling Engine. The experimental method can be seen in the image provided. We have been asked to calculate the power dissipation PR and the energy dissipation per cycle WR as part of our lab report. The other variables mentioned are R (the resistance), UR (the measured voltage), n (the revolutions per min), T1 and T2, the temperature of two thermocouples connected to the engine.
At R = 500Ω, the recorded values are: UR = -3.68V, n = 494 cycles min-1, T1 = 150°C and T2 = 63.2°C.2.
  • PR = V2/R
  • W = P*t (where W is work, P is power and t is time)

3. I was able to calculate the Power Dissipation using the above equation (PR = 0.027 W) but I'm totally lost on finding WR. I've tried using the above equation and subbing in WR and PR and finding the time it takes for 1 cycle but that gives me a very small number when compared to the value of WpV = -2.4498J.
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  • #2
If you know the energy dissipated per second, then it is a matter of knowing how many cycles per second and converting.
If there are a lot of cycles per second, then the resulting energy per cycle will be very small.
 

1. How does a Stirling Engine work?

A Stirling Engine works by using the expansion and contraction of a gas to generate mechanical work. It has two pistons, one hot and one cold, that move in and out of cylinders. As the gas is heated, it expands and pushes the hot piston out, while the cold piston is pushed in by the contracting gas. This creates a cyclical motion that can be harnessed to turn a crankshaft and produce energy.

2. What is the energy dissipated per cycle in a Stirling Engine?

The energy dissipated per cycle in a Stirling Engine depends on several factors, including the temperature difference between the hot and cold sides, the volume and pressure of the gas, and the efficiency of the engine. Generally, it is calculated by measuring the work output of the engine and subtracting the work input (from the heat source) to account for any losses.

3. How is the energy dissipated per cycle measured in a Stirling Engine?

The energy dissipated per cycle in a Stirling Engine can be measured by using a dynamometer to measure the torque and rotational speed of the crankshaft. With these values, the work output can be calculated. The work input can be measured by monitoring the heat input from the heat source. The difference between the two is the energy dissipated per cycle.

4. What factors affect the energy dissipated per cycle in a Stirling Engine?

The energy dissipated per cycle in a Stirling Engine can be affected by the temperature difference between the hot and cold sides, the volume and pressure of the gas, the efficiency of the engine, and any losses due to friction or heat transfer. Additionally, the design and materials used in the engine can also impact the energy dissipated per cycle.

5. How can the energy dissipated per cycle be optimized in a Stirling Engine?

To optimize the energy dissipated per cycle in a Stirling Engine, the temperature difference between the hot and cold sides should be maximized, and the volume and pressure of the gas should be carefully controlled. Additionally, using efficient materials and reducing losses from friction and heat transfer can also improve the energy dissipation. Regular maintenance and tuning of the engine can also help to optimize its performance.

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