What happens to the exhaust gas from the microturbine in a combined heating system?

In a combined heating system that utilizes a microturbine, the exhaust gas is effectively used to maximize energy efficiency. The correct choice indicates that the exhaust gas is sent through a boiler or water heater, which allows for the capturing of waste heat.

The microturbine generates electricity, but it also produces hot exhaust gas as a byproduct. Instead of allowing this hot exhaust gas to be wasted, it is directed into a boiler or water heating system where the heat can be transferred to water, effectively transforming it into usable thermal energy. This process, known as combined heat and power (CHP), enhances the overall system efficiency by utilizing heat that would otherwise be released into the environment.

This means that the energy from the exhaust gas contributes to space heating or water heating, which is particularly beneficial in reducing overall energy costs and improving system performance. This approach underscores the principles of energy efficiency and sustainability, as it makes good use of all generated energy in the system.