Heat Recovery Micro Systems

       Thermodynamic Technology Development

Electricity Utilities

Utilities making use of thermal power generation all use the rankine or modified  water/steam cycle as power block, where the latent heat of the exhaust low pressure steam is condensed in a condenser where cooling water circulate through the condenser, entering at a temperature around 30 - 35°C and leaving the condenser at a temperature of some 40 - 45°C. This cooling water is then externally cooled by fan powered radiators (in dry-cooling systems) or evaporative (wet-cooling) cooled in huge cooling towers. The waste heat so produced is in fact more than the generator power output of the power station, as the power station real electrical output is only around 34% of the total energy in the fuel combusted. The REHOS cycle is able to extract heat from this low temperature waste heat in the cooling water (see my paper [11] available from the Homepage), and dropping the CW temperature a few degrees, generating useful electricity from it to utilize some of this 50% - 60% normally wasted heat.

In the short and medium term (10 - 20 years) electrical utilities may use large REHOS machines to utilize this CW waste heat pool to increase (double) the power station output without using any more fuel. This will have several advantages like:

  • water used (evaporated in the cooling tower) per kWh electricity produced would drastically decrease, saving a lot of water;
  • cooling of the average CW entering the condenser, thereby increasing the existing power station power output capability by decreasing the condenser internal saturation pressure;
  • allow de-rating of older power stations to decrease deteriorating boiler pressure parts without decreasing the power station electrical outputs;
  • postpone the need for new built power stations, by gradually phasing  in REHOS technology to replace the old power stations near the end of their economic life;
  • phase in solar thermal heat generation on the same power station locations to gradually replace the fossil combustion while transitioning to lower cost REHOS generation;
  • the same arguments also hold true for current (and future) solar thermal power station installations, as they all have a power block operating on the rankine cycle ending in vapor latent heat being dissipated in cooling water and cooling towers.

  In the longer term the utility (and PPA's) should prepare for near-free electricity, maybe developing into a distributed generation service company making use of REHOS technology to stay in the electricity business. With REHOS technology available to all, also in competition to the current utilities, electricity prices would start a downwards trend, killing the utilities economically that do not move away from higher cost fossil and nuclear generation and embrace the REHOS technology for baseload electricity generation.

  Even the current low-cost PV power stations are in jeopardy, as REHOS technology can generate 4 - 5 times the amount of electricity from the same solar irradiation, but with a load factor of 80% - 85% like base load power generators, instead of the 20% - 25% load factor of solar PV installations, as no power can be generated by a PV station when the sun is not shining. Even if the capital original investment was the same, the REHOS technology may use solar thermal energy storage in ambient temperature water collectors, creating the possibility of power generation on demand at a cost of 20 - 25% of the current PV power station, as well as using only ~ 5% of the land area occupied by an equivalent PV system (look at the many uses of REHOS technology in the publication [8] available from the Home page.

  As this REHOS technology can produce base load power at greatly reduced costs and with flexibility of doing just that from a few hundred kilowatt to several megawatt, even the thought of nuclear power generation would be far-fetched, as it would soon be white elephants -outperformed by small, low cost REHOS generators producing the same power distributed to where it is needed.

If you are in the waste heat recovery business using ORC technology, you would jump at an opportunity to be licensed to add the REHOS Technology to your business. It would revolutionize your offering! Read the downloadable documentation on the Home page and contact us to start the licensing discussion!