NCIDQ IDFX Practice Exam

What type of system uses a convector to radiate heat?

1. All water heating system

2. Terminal reheat system

3. VAV system

4. Air conditioning system

The correct answer is: All water heating system

A system that utilizes a convector to radiate heat is an all water heating system. This type of system operates by circulating hot water through pipes to convectors, which are typically designed to transfer heat to the surrounding air. These convectors rely on the principle of radiation and convection to warm up a space, where the hot water heats the metal components of the convector, and subsequently, this heat is transferred to the air in the room. In contrast, a terminal reheat system refers to a setup that reheats air at the terminal or outlet level, typically within a ducted heating system. This process often involves heating the air using coils rather than using water through convectors. Similarly, a VAV (Variable Air Volume) system regulates air volume in the ducts rather than using water for heating; it does not employ convectors directly. Lastly, an air conditioning system is primarily designed for cooling, using refrigeration cycles rather than radiant heat transfer through water systems.