Answer :
Final answer:
For HVAC system cooling load calculations, all three modes of heat transfer need to be considered: conduction, convection, and radiation. These processes can happen simultaneously and are critical for determining the accurate cooling requirements of a building.
Explanation:
When calculating the cooling loads for an HVAC system, it is important to consider all three methods of heat transfer, which are: conduction, convection, and radiation. Conduction is the heat transfer between objects in direct contact, convection is the transfer of heat through fluids (gases or liquids) caused by molecular motion, and radiation is the transfer of heat in the form of electromagnetic waves, primarily infrared radiation.
All three types of heat transfer may occur simultaneously in an HVAC system as it interacts with the internal and external environment of a building. Conduction occurs through walls, windows, and roofs; convection can happen due to air movement within a room or between the inside and outside; and radiation can come from sunlight coming through windows or from appliances and occupants inside a building.
Therefore, the correct answer to the student's question is d) Conduction, convection, and radiation.
