Organic Rankine Cycle
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WASTE HEAT USED IN THERMAL POWER PLANT Madhujha1, Ankit Kopte2, Gaurav Deore3
1,2,3Mechanical Engineering, Sandip Institute of Technology and Research Centre, Nashik, Pune University, (India)
The supercritical CO2 Rankin Cycle uses waste carbon dioxide instead of water/steam in its driven cycle and converts the waste heat in electricity for various industries and scale power generation.
While thermoelectric system are solid state electricity converts combination of thermal, electrical and semiconducting properties which allow them to convert waste heat into electricity.
The electricity can be used in two phase air-conditioning compressor, heat pump or in any small industries.
Keywords: (Sco2), Thermal Electric System, Power Generation
1.1 The Supercritical CO2-Based Power Cycle:
The supercritical carbon dioxide (sCO2) used in thermal efficient heat engineand patent-pending operating cycles to deliver a flexible, low-cost thermal engine for a wide variety of applications.
The five main components in sCO2 heat engines: exhaust and recuperator, condenser, heat exchangers, system pump, and power turbine.Heat energy is introduced to the sCO2 power cycle through an exhaust heat exchanger installed into the exhaust stack from a gas turbine or reciprocating engine or into a flue gas stream from a fuel- fired industrial process.
Echogen’s cost-effective, emission-free power will enable fuel intensive operations to address growing concerns regarding power cost and environmental stewardship.Echogen’s technology recycles the wasted thermal energy and provides integrated power and heating or cooling with flexible system architectures, configurable for power, co-generation or tri-generation.
Supercritical CO2 (sCO2) is an ideal working fluid for closed-loop power generation applications and It is a low-cost fluid that is non-toxic and non-flammable.The exhaust heat exchanger can be placed in direct contact with-high temperature heat sources, eliminating the cost and complexity of an intermediate heat transfer loop typically used in Organic Rankine Cycle (ORC) applications because of its high thermal stability and non- flamability.
1.2 Thermoelectrics as Heat Engines
TE devices are solid-state heat engines. Unliketoday’s air conditioners, which use two-phasefluids such as the standard refrigerant R-134A,TE devices use electrons as their working fluid.Figure 1 demonstrates the principal effects that govern their performance. In 1834, Peltier observed that if a current is
applied across a junction of dissimilar electrically conductive materials, either heating or cooling can occur at the junction. When the current is reversed, the opposite effect is observed. Figure 1A illustrates why this occurs.
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