Let's consider using heat exchangers in the process of generation of electricity by the heating of water. Heat exchangers are one of the most popular types of equipment required in a combined cycle where you are using turbines that are good for two things.
First, it is imperative to have a suitable propellant or fuel to ignite the turbines that initiate all the process; of course, if you design your module to create electricity, turbines can come in many shapes and types. Let us consider using a gas turbine that acts as a turbine enough to generate the heat and have a shaft to go directly to a generator of electric energy, of course, after making the proper propellant or fuel. That part is one of the most important tasks by deciding what type of power you will burn in your turbine or turbines depending on the module's design arrangement to create enough output of electricity demanded by the client.
Let's consider using heat and pressure directed to the tubes and pipes array in the heat exchanger design. It will also depend on the size because it's deemed to use boilers or a heat exchanger arrangement. That will be the most efficient in using the water; from the sewer, in this case, the need for a filter is highly recommended and required to have a proper fluid that will provide the output of energy created by the vapor directed to the compressor and finally to the generator. I prefer using clean water and forget about the filtering process to avoid the extra cost.
Now, suppose the system is using water to create energy by heat exchangers. In this process, the fuel must be of great importance. As we said before, if we consider using the same water to be separated and produce Hydrogen as the perfect fuel or propellant required to activate the whole system, you can view the construction of a module within the system to provide the Hydrogen by electrolysis or electrochemistry, that could be the best option. Still, most people are afraid of this type of process because they think it is dangerous or not safe; on the contrary, it is stable. The fuel quality is flawlessly comparing the methane that most process does not comply with the rule of Clean, Green, low cost, and reliable energy.
We can consider Hydrogen a very stable isotope that can directly provide power as fuel to the boiler or heat exchanger arrangement with incredible output. You can always store the excess Hydrogen, and oxygen can also offer pressure and energy to the system. Water is becoming the best solution for a system with an excellent Megawatts output, considering the total arrangement.
We have to consider technology advances every day more and more, and we can expect the procurement of a propellant or fuel directly from the atmosphere. Wouldn't that be the most practical way to resolve things? Of course, but meanwhile, we have systems to produce Hydrogen at 1/3 the cost of regular gas, and a lot more efficient than methane and ethanol; in the process itself, a lot of companies have the idea that you can process clean, reliable, and cost-effective energy with biomass but they have no considerations on the quantity of Co2 they are producing of the process that will result in a final contamination product, even if you have a 30% of Co2 simply will be taking the clean energy you can produce with water in new ways to separate Hydrogen from oxygen, and have a couple of integrated systems to provide what is needed clean, cheap and reliable energy.
Any other technology has proven to have flaws, even though the technology is advancing every day.