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Examoogle • User • info@examoogle.com • EE-2024-8821
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Osmotic energy conversion involves energy production from
Low boiling point liquids
Low vapor pressure liquids
Miscible liquids
Salt water
Salt water
Quick Summary: Osmotic energy, also known as blue energy or salinity gradient power, is the energy obtained from the difference in salt concentration between seawater and river water. It exploits the chemical potential difference existing between two solutions with different salinity levels when separated by a semi-permeable membrane.
Osmotic energy, also known as blue energy or salinity gradient power, is the energy obtained from the difference in salt concentration between seawater and river water. It exploits the chemical potential difference existing between two solutions with different salinity levels when separated by a semi-permeable membrane.
ΔΠ=cRTΔi — where ΔΠ is the osmotic pressure difference, c is molar concentration, R is gas constant, T is temperature, and i is van't Hoff factor.
The principle relies on Pressure Retarded Osmosis (PRO). When freshwater and saltwater are separated by a semi-permeable membrane, water molecules naturally migrate toward the saltier solution due to osmotic pressure. This flow increases the pressure on the seawater side, which can be used to drive a turbine to generate electricity.
Utilizes the chemical potential gradient between water sources of different salinity.
Commonly uses Reverse Electrodialysis (RED) or Pressure Retarded Osmosis (PRO) technologies.
Considered a highly consistent and predictable renewable energy source unlike wind or solar.
The process occurs naturally at river estuaries where freshwater meets the ocean.
High energy density potential
Continuous power generation (24/7)
Minimal greenhouse gas emissions
High membrane cost and fouling issues
Environmental impact on estuarine ecosystems
Requires large volumes of water
Coastal power plants
Integration with desalination plants (to recover energy from brine)
The maximum theoretical pressure head of seawater against freshwater is approximately 24-27 bar.
Option A refers to OTEC (Ocean Thermal Energy Conversion), not osmotic energy.
D is correct — Osmotic energy conversion generates electricity by utilizing the osmotic pressure gradient existing between saltwater and freshwater.
Always differentiate between OTEC (which uses thermal gradients in seawater) and Osmotic power (which uses salinity gradients), as both are often grouped under 'Marine Energy' in exams.