ANS:A -

The temperature profile along the length of a gas-gas counterflow heat exchanger is typically represented by a decreasing curve. At one end of the heat exchanger, the hot gas enters, and as it flows along the length of the exchanger, it transfers heat to the colder gas flowing in the opposite direction. This heat transfer causes the temperature of the hot gas to decrease gradually while simultaneously increasing the temperature of the cold gas. As a result, the temperature profile of the hot gas decreases along the length of the heat exchanger, while the temperature profile of the cold gas increases. A typical representation of the temperature profile along the length of a gas-gas counterflow heat exchanger is a decreasing curve for the hot gas and an increasing curve for the cold gas. This represents the gradual exchange of heat between the two gas streams as they flow in opposite directions within the heat exchanger.