In mechanical systems, what does 'hydronic' imply?

The term 'hydronic' specifically refers to systems that utilize water as the heat transfer medium. In hydronic systems, water is heated in a boiler or another heat source and then circulated through pipes to radiators, baseboards, or other heat exchangers throughout a building. This method of heat transfer is efficient and allows for more precise control of temperature in individual spaces compared to other mediums.

Using water as the heat transfer medium has advantages such as its high specific heat capacity, which allows it to carry and transfer heat effectively. Additionally, hydronic systems can operate at lower temperatures compared to those using other mediums, which can enhance energy efficiency. Considering these properties, hydronic systems are commonly employed in various heating, cooling, and even chilling applications in commercial and residential buildings.

The other options refer to different methods or mediums that do not align with the definition of hydronic systems, which is focused solely on water as the medium for heat transfer.