You will need to know the total watts of the lights in the space you are calculating your heat load for. The more efficient LED that are commonly used in lighting retrofits and put off less heat for the same amount of light as other types. Incandescent are the least efficient and turn a lot of their energy into heat instead of light. Lights give off heat in various quantities based on their properties. 635 Btu/HourĢ) Lighting – Internal Sensible Load Lighting Sensible Heat Load A gym needs more air (CFM) per square foot or meter than does an office space of the same size. ASHRAE show various levels of activity, such as “Seated – Very Light Work (230 Btu/Hr), Seated – Light Work (255 Btu/Hr) and Heavy Work – Lifting (635 Btu/Hr)”.Īs the level of activity increases, so does the amount of heat that a person gives off to the space they occupy and the more air conditioning capacity you will need. The amount of heat they contribute depends on the level of activity they are involved in. People add heat to the space they occupy. 1) People – Internal Sensible Load ASHRAE Sensible Load per Person There are 4 Main Contributors, and several others that contribute to Sensible Heat gain based on variables that we will discuss later. Sensible Heat is a Change in Temperature (DB) with no change in moisture content. You will first need to determine the total heat gain for your space as shown below. The following are the formulas you can use to determine the requirements for any room. Please include attribution to with this graphic. (Click here to enlarge Infographic) Share this Image On Your Site What exactly determines the size of the heating and air conditioning system and the required amount of air (CFM) to be delivered to the space? in this article we’ll show you what goes into calculating the cooling load of a building and the CFM for a typical exterior room with a window.
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