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 (patent pending), a real Game Changer in Power Generation. It is derived from the ammonia-water binary absorption refrigeration and absorption heat transformer (AHT) cycles, (but can of course also be built using other binary compounds like Li-LiBr, CaCl2-Water, or CO2-Water etc.) All the latent heat of the vapor in the low pressure turbine exhaust is regeneratively recovered in an absorber of an AHT, and re-used in a heat pump configuration to vaporize the high pressure ammonia liquid of the ORC power sub-cycle in a fully regenerative way, for the turbine to expand to generate power.

The REHOS Cycle therefore consist of an normal state-of-the-art, organic rankine (ORC) power sub-cycle, combined with an absorption heat transformer (AHT) heat pump sub-cycle. The standard state-of-the-art AHT absorb vapor and generate a temperature raise of some 40 - 60 degrees Celsius using the heat of solution of binary mixtures. As a simple example, assume power is generated in an ORC sub-cycle, operating between a high temperature of 25 degrees Celsius and a low temperature of -17 degrees Celsius, with an efficiency of about ~ 9,34%, which is roughly 66% of the ideal, carnot efficiency calculated for these temperatures. This power sub-cycle is combined with an AHT heat pump sub-cycle operating between -19 Celsius and 35 Celsius, that reclaim all the reject heat (as low pressure vapor) from the ORC cycle regeneratively and pump it to 10 degrees Celsius higher than the ORC input heat temperature level. This AHT heat pump is realized with a conventional vapor compressor, absorbing heat (by flashing vapor from a binary mixture) from the cold side of the AHT reactor and bubbling the compressed vapor into the hot side, where it is absorbed, generating the high temperature of the binary liquid from the absorption heat. The compression ratio is very small to only overcome the liquid column hydraulic pressure (only about 1,1 for a 2 meter binary mixture liquid column), raising the compressed output vapor temperature adiabatically barely 3 degrees Celsius above the input. This specific example AHT heatpump coefficient of performance (COP) calculate to ~ 68, which is about 80% of the ideal, carnot efficiency for the mentioned temperatures.

When the AHT heat pump sub-cycle reclaim the ORC reject heat regeneratively as input heat, the amount of output heat pumped to the high temperature of 35 Celsius, fall short of the required amount of heat to power the ORC. This heat shortfall (which amount to only slightly more than the actual ORC power output energy), is the real REHOS cycle heat input, and must be delivered from external sources. This shortfall heat may be added into the AHT heat pump binary column at any temperature level between the cold -19 Celsius and hot 35 Celsius, with nearly the same effect. Ambient heat from the environment may therefore be used to power the REHOS cycle, at a thermodynamic heat to power conversion efficiency > 80%, nearly independent of the temperature of the waste heat input, the efficiency calculated as  (ORC output power, minus pumping power, minus compressor power), divided by the heat shortfall.

This simple example merely summarize the processes, but does not really do the revolutionary REHOS technology justice, and may still leave many questions, so it is very strongly advised that you download and study the attached documents below for a better understanding......

The extreme scalability of the REHOS cycle from a few kW to several Megawatt, as well as the combination of refrigeration (A/C) and power generation without the need for external cooling towers are just some of the revolutionary breakthrough aspects of this technology. The further revolutionary effect of being able to extract waste heat from the environment and generate base load power from it, put this Renewable Energy Technology in a class all on its own.

The extremely high heat to power conversion efficiency, as well as the flexibility of using different readily available organic rankine (OR) isentropic turbines, positive displacement expanders like Scroll Expanders and Lysholm Turbines just to name a few, and standard off-the-shelf compression equipment and heat exchangers in the REHOS cycle, would enhance global implementation to form a true Energy Revolution. All the equipment used in this cycle are coming from existing, state-of-the-art technology, just configured differently to form this novel regenerative thermodynamic power cycle.  On the following pages the effect of implementation on various sectors of the economy is touched on.

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 REHOS Technology Introduction.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 other 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, the pdf files, as well as links to websites where articles were published have been added below for you to download.......


Having read all the other downloads and linked documents and still confused? Then you have to read the latest description of the Simplified REHOS Cycle. Download this:  The Simplified REHOS Cycle.pdf


Further to the Simplified REHOS cycle document, I also compiled a further detailed document, more for the academics among us, as this document cover the details of the real thermodynamic process values and how it was calculated, for a typical example process of the Simplified REHOS Cycle configuration. Should you be part of an academic institution and looking for research topics for your PhD students, this would be the document to have them prove the REHOS cycle in a laboratory and dedicate their thesis to reverse global warming.

Download the highly technical clarification:  Clarifying Process Parameters for the REHOS Cycle Concept_rev3.pdf