## Introduction to Wave Energy

You may have noticed that there is a certain kind of air force when you go near any seashore. This is due to a type of energy which gets transport by wind waves. This energy is also known as wave power. When the wind passes on the water surface, it leads to the pressure difference between upper and bottom wind which results in the generation of waves. This wave energy which is captured can be used to for several useful works namely water distillation, electric generator, and WEC.

The motion of waves contains a different degree of energy. The electromagnetic waves from the wave energy give us energy for sustaining life on earth. Water desalination or the pumping of water into reservoirs are some of the uses of the wave energy, electricity generation, etc. Some of the main properties of waves include speed, frequency, period, amplitude and wavelength.

### Ocean wave energy and types:

Ocean wave energy is a natural source of energy which is directly captured from the pressure fluctuations below the surface or from the surface area itself. They are therefore of two types namely:

- Ocean Thermal Energy
- Ocean Mechanical Energy

In Ocean Mechanical Energy, electricity is produced by taking energy from the ocean in three main types:

- The channel systems, which are used to funnel the waves into reservoirs.
- Float systems are used to run the hydraulic pumps.
- The column system is used to compress the air present within the containers.

Ocean wave energy is then used to rotate the turbine or the generator and the electricity is produced.

The Ocean Thermal Energy uses the temperature of the surface sea waters to run a heat engine and produce electricity.

### Wave energy conversion

The wave energy formula for those areas where the depth of water is larger than half the wavelength is:

\(\large P = \frac{pg^{2}}{64 \pi}H^{2}_{m0}T_{e}\approx \left ( 0.5 \frac{kW}{m^{3}\cdot s} \right )H^{2}_{m0}T_{3}\)

### Example of Wave Energy Conversion

**Question:** Consider moderate ocean swells, in deep water, a few km off a coastline, with a wave height of 3 m and a wave energy period of 8 seconds.

Solution:

The formula for power is

\(\large P \approx 0.5 \frac{kW}{m^{3} \cdot s} \left ( 3\cdot m^{2} \right )\left ( 8 \cdot s \right )\approx 36 \frac{kW}{m}\)

i.e. there are 36 kilowatts of power potential per meter of wave crest.

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