Energy Production Thermal Energy Transfers Thermal Energy Transfers

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Energy Production

Energy Production

Thermal Energy Transfers

Thermal Energy Transfers

Thermal Energy Transfers convection

Thermal Energy Transfers convection

Thermal Energy Transfers

Thermal Energy Transfers

Thermal Energy Transfers Why does this MATTER?

Thermal Energy Transfers Why does this MATTER?

Thermal Energy Transfers

Thermal Energy Transfers

Blackbody Radiation

Blackbody Radiation

Blackbody Radiation

Blackbody Radiation

Blackbody Radiation Emissivity = A unitless measurement of the efficiency of an object’s thermal

Blackbody Radiation Emissivity = A unitless measurement of the efficiency of an object’s thermal radiation. Stefan-Boltzmann Constant (σ)= 5. 67 x 10 -8 W m-2 K-4

Blackbody Radiation The earth has an average surface temperature of 15 degrees celcius, and

Blackbody Radiation The earth has an average surface temperature of 15 degrees celcius, and a radius of 6, 371 km. What is the total power radiated from the Earth if the emissivity is approximately 0. 5? The intensity of the radiation of the sun on Earth is 1. 35 k. Wm-2. The Earth is 1. 5 x 1011 m from the sun and the radius of the sun is 6. 96 x 108 m. If stars are considered perfect black bodies (emissivity of 1), what is the sun’s surface temperature?

Blackbody Radiation Modelling Introduction! Using excel, we are going to make a simple model

Blackbody Radiation Modelling Introduction! Using excel, we are going to make a simple model for the following situation: • An isolated sphere in space has an initial temperature of 5, 000 K, a radius of 40 m. Determine the power output of the sphere. • The density of the sphere is 1000 kg/m 3, and the specific heat capacity of the sphere is 120 J kg-1 K-1. Determine the temperature change in the first second. • Using this new temperature… REPEAT! • What if there is an emissivity of 0. 6?

Blackbody Radiation

Blackbody Radiation

Blackbody Radiation

Blackbody Radiation

Blackbody Radiation The surface temperature of the sun is approximately 5778 K. What is

Blackbody Radiation The surface temperature of the sun is approximately 5778 K. What is the most intense wavelength and color emitted by the sun? Most incandescent light bulbs have a maximum intensity at 880 nm. Is this light visible? What temperature is the filament of the bulb?

Incident Radiation

Incident Radiation

Incident Radiation

Incident Radiation

Incident Radiation

Incident Radiation

Albedo

Albedo

Incident Radiation Given the solar constant of 1. 37 k. W/m 2, determine the

Incident Radiation Given the solar constant of 1. 37 k. W/m 2, determine the overall solar radiant energy that is incident on earth every second. How much energy is absorbed if the albedo is 0. 3? Given the energy absorption of the earth above (using an albedo of 0. 3), build an excel model that represents the energy absorbed and the energy radiated by the earth every second. Assume the Earth begins at an average temperature of 0 degrees Celsius. Is there a temperature equilibrium that stabilizes? Why? Vary the initial temp of the Earth. Explain what happens.

The Atmosphere

The Atmosphere

The Atmosphere

The Atmosphere

The Atmosphere

The Atmosphere

The Atmosphere

The Atmosphere

The Atmosphere

The Atmosphere

The Final Model Build an excel model to simulate the absorbed and radiated energy

The Final Model Build an excel model to simulate the absorbed and radiated energy from the earth.

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