I would like to share more thoughts on the topic, because my method for converting heat into mechanical energy raises many questions that we've never asked ourselves. And the answers are not easy, considering the many dependencies of thermodynamic and mechanical nature in it. More so than 200-300 years, we used to have "free" cooling (whether the method is external or internal combustion engines) and to "pay" for heating. Disposal of waste steam and exhaust gases in the atmosphere is "free" cooling. OТЕС only have a "free" heating and cooling.But they have to seek special places on the planet where nature provides similar temperature differences.My method can turn the heat to the environment (atmosphere, rivers and seas) almost anywhere on earth. 

 The heat got it everywhere - and everywhere I can create cold, so I can use it.

When I want to use the "free" heat of the environment do not have a cold - all around me was equally warm. I need to create cold, to "pay" for the cold - this is the prerequisite for the conversion of heat around the device into mechanical energy. But will "pay" only once, initially. Then I will ask the pumps right flow, so that the cold part remains cold, while in the warm part  the heat of the environment turns into mechanical energy. 

This can only be achieved with a closed loop of the working substance. To close the cycle of working substance must always "pay" - theoretically no free closed cycle. To make it possible to close the cycle of working substance, and we remain "profit" as we mean that necessarily will "pay" must take more energy than will "spend" to close the cycle. We achieve this by increasing the number of couples - evaporator - energy converter. For a given flow pumps more couples arrange in the chain, we are approaching closer to "free"  closing of the cycle - the temperatures tend to boiling point of the working substance.We can never reach the boiling point - there is no way on the one hand there is no pressure on the other to have a conversion of heat into mechanical energy. But at temperatures close to the boiling point will close the cycle easily - from the temperature difference - environment-boiling point will remain useful mechanical energy.

 Assume that we have reached the boiling point - lets include in cycle another couple. They appear already harmful to useful energy - the evaporator has no power to push - energy converters will be a suction pump (suction actually not so bad. My initial ideas were last  one(few) to suck, sucking means  cooling the evaporator hence cooling of the heat exchanger with gaseous substance. So with the help of sucking however, a one (few) couples can close the cycle of working substance. Then I realized that this method of closing the cycle an energy (heat) will accumulate in cold part. Then "came "compressors" and sent "residual "energy (heat) in the warm part of the device to work for some :)). Then we can increase the flow of the pump - to increase the temperature and to return to the previous regulations. This means more usable energy.

We can conclude - for each configuration (number and size of couples - evaporator - energy converter) the unit has optimal flow pumps, in which the closing of the cycle is the most "- cheap" and the useful energy is the largest.