Heat Recovery Micro Systems

Thermodynamic Technology Development

Welcome to Heat Recovery Micro Systems!

We recently developed a revolutionary new thermodynamic power cycle, called REHOS (Regenerative Heat of Solution) thermodynamic cycle, a real Game Changer in Power Generation. It is derived from the ammonia-water binary absorption refrigeration cycle, (but can of course also be built using other binary liquids) but instead of expanding liquid ammonia via a Joule-Thompson expansion valve for heat extraction (refrigeration), the high pressure liquid is vaporized and expanded in a turbine to develop power. All the latent heat of the vapor in the low pressure turbine exhaust is regeneratively recovered in an absorber and re-used partially for desorption purposes for splitting the ammonia in aqua solution again into its components of water and pure ammonia liquids. The balance of the absorber heat is used to vaporize the high pressure ammonia liquid into vapor in a fully regenerative way for the turbine to expand isentropically (or isothermally, depending on the expander used) to generate power.

The REHOS Cycle is a closed-loop binary cycle engineered to absorb heat from the environment at temperatures ranging below 70 Celsius, but could be as low as 1 - 2 Celsius, and convert it into power, with an extremely high thermal to power energy conversion efficiency, as very little heat is rejected to the environment. (The only power loss comes from some generated power utilized to drive the heat pump compressor). No heat is officially rejected out of the cycle, and the only energy leaving the cycle is the power generated, as well as radiation losses from warm pipes and heat exchange vessels. Utilizing the heat of solution and latent heat of ammonia vapor in an absorber into a lean mixture of ammonia in aqua, to raise the temperature of the absorber high enough to facilitate near-perfect heat recovery in both the absorber and desorber heat exchangers, eliminating the need for heat rejection completely. The REHOS Cycle is therefore actually a modified absorption refrigeration cycle with the refrigeration effect replaced by a power turbine and external heat input achieved via a heat pump.

The extreme scalability of the REHOS cycle from a few kW to several Megawatt, as well as the combination of refrigeration and power generation without the need for external cooling towers are just some of the revolutionary breakthrough aspects of this technology. The binary media we use also put this cycle into the waste heat recovery arena, as it operates at temperatures below 150 Celsius.

The extremely high heat to power conversion efficiency, as well as the flexibility of using different (also conventional  isentropic) expander and compression equipment and heat exchangers in the REHOS cycle, would enhance global implementation to form an Energy Revolution. On the following pages the effect of implementation on various sectors of the economy is discussed.

Using the correct global implementation strategy, healthy competition in the capitalist economies around the world would very soon force the cost of the REHOS cycle hardware down dramatically, making the electricity it can produce nearly free.....when using solar thermal, geothermal and the abundant waste heat readily available globally. This would create a massive revolutionary increase in the use of electricity in all sectors and cut the use of fossils (and generation of CO2) drastically, as it would simply not make economic sense to use expensive fossil fuels any more, effectively limiting global warming to the required target < 2 Celsius. Commercial gain and human greed would drive implementation globally, bankrupting large and persistent fossil fuel users that resist adoption of the lower cost REHOS technology empowered power generation.

Using the REHOS technology for commercial gain globally, may just reverse global warming! Check the next pages to recognize the huge economic stimulus that can be brought about by the "near-free" electricity the REHOS technology can bring globally. This, added to the secondary market of people demanding more and more electrical appliances, -vehicles, -planes, -boats etc. to use this "near-free" electricity would surely eradicate poverty in many countries and stimulate job creation and economic prosperity globally!

The Energy Revolution has started with the launch of the REHOS technology by presenting the paper attached here that was published in the POWERGEN-AFRICA Conference Proceedings of July 2017, held at Sandton Convention Centre in South Africa: PowerGen-Africa 2017 Proceedings Speaker0_Session19149_1.pdf  This paper was selected by the Conference Best Paper Awards Committee as one of the three finalists, giving it a label of "Highly Commended".

Should you be interested in our previous publications showing that the REHOS cycle actually represent Baseload Power Generation, and could readily be added as bottoming cycle to existing fossil fueled, nuclear and even solar thermal power plants to increase generation efficiency, is added as additional Acrobat file below for you to download.......