Talk:Clean Heat & Power

Comment

In my opinion, hot water to heat buildings (about 100°C) is not a typical example for high temperature heat. Waste heat from buildings cannot be used for electricity generation. High temperature heat is, for example, steam upstream of a steam turbine (about 500°C) or flue gas before a gas turbine (about 1 000 °C).

I propose to change the article by the following:

Combined heat and power (CHP) is a principle in which fuel is used to simultaneously generate both heat and electric power. This principle is also called co-generation of heat and power. The objective is to improve energy efficiency in comparison to using two separate systems to generate heat and power.

In the process of converting fuel energy in thermal power plants, electricity is only one of the output. As by-product, heat is a second output of the process. In power plants which are used for electricity generation only, this waste heat is not utilized but is emitted to the environment by the flue gas, cooling towers or other means.

It is more energy efficient to utilize this waste heat, for heating of buildings in the residential sector, to supply process heat to the industrial sector or other applications. This increases the efficiency in transforming fuel energy not only to electricity but additionally to heat.

CHP systems are generally only economical on a large scale, for example to provide heating water and power for an industrial site or an entire town. Common CHP plant types are:  Gas turbine CHP plants utilizing the waste heat in the flue gas of gas turbines  Combined cycle CHP plants utilizing the waste heat of combined cycle plants  Steam turbine CHP plants utilizing the waste heat in the steam after the steam turbine.

However, small CHP units for hospitals, swimming pools or groups of dwellings are also economic if standardized CHP-units which are manufactured in high series or mass production are used. These are especially internal combustion (IC) engines (gas or diesel engines) used for car manufacture. They utilize the waste heat in the flue gas and cooling water of gas or diesel engines and replace the traditional gas- or oil-fired boiler (furnace) used in central heating systems.

What is your opinion?

Avoided double redirect notice looks backwards

Combined heat and power currently has a redirect template on it stating that it's an alternative name for "Clean Heat & Power". I see a note in the edit history at this title effectively saying that "combined heat and power" has been renamed "Clean Heat & Power". How can this be, that something has been renamed from a generic phrase to a proper noun?

Furthermore, to me, the meaning of "combined heat and power" is pretty much as described in the lead of target article Cogeneration, with a typical example being the use of a gas boiler to generate electricity as well as to heat a building. It would only be "clean" heat and power if it uses a non-polluting means of extracting energy, such as solar or wind power.

I've done a quick Google search, and it seems "combined heat and power" remains the standard generic name for this technology. "Clean Heat & Power" seems to occur only in the names of particular organisations; even "clean heat and power" doesn't seem to give any reference to the phrase being used generically to refer to this kind of technology. Indeed, I would expect the phrase "clean heat and power" to mean producing heat and power with little or no pollution, regardless of whether they are combined into a single apparatus / energy source.

So maybe some organisations use "Clean Heat & Power" as a brand name for their combined heat and power offering, if said offering is 'clean' in some way. But there's no way I can see that "Clean Heat & Power" can possibly be the generic name for the technology. As such, I think the 'avoided double redirect' notice should be on Clean Heat & Power, referencing Combined heat and power. If nobody can convince me otherwise, I'll update. — Smjg (talk) 12:48, 1 July 2019 (UTC)