Final answer:
Supply air from HVAC systems is conditioned air distributed to the occupied space to maintain a comfortable environment. It is generally warmer in the winter and cooler in the summer and is typically propelled into the occupied space at a higher pressure compared to return air for effective distribution.
Step-by-step explanation:
The correct answer to the question regarding supply air from HVAC systems is b) Supply air is conditioned air distributed to the occupied space.
Supply air in an HVAC system is treated air that is sent into an indoor space to maintain a comfortable environment. It is typically at a temperature that is optimized for comfort depending on the season, meaning it is typically warmer in the winter and cooler in the summer. While supply air contributes to ventilation, its main purpose is to provide thermal comfort and maintain air quality.
Regarding the pressure differences, the statements provided lead to some confusion. Within an HVAC system, the supply air can be at a higher pressure than the return air to ensure proper distribution throughout the space. However, it's crucial to note that its pressure is controlled to meet the specific requirements of the HVAC design and varies from one system to another. Therefore, statement a) is not universally true.