What is the latent heat load in BTUh for air at 1500 CFM with an absolute humidity difference of 28 grains?

To determine the latent heat load in BTUh based on air flow rate and humidity difference, we can use the formula related to moisture removal. The latent heat load can be calculated using the following formula:

[

\text{Latent Heat Load (BTUh)} = \text{CFM} \times \text{Humidity Ratio Difference} \times 0.69

]

In this case, the air flow is 1500 CFM, and the absolute humidity difference is 28 grains. First, we need to convert grains to pounds, as the humidity ratio in the equation typically uses pounds of moisture per pound of dry air. There are 7000 grains in a pound, so:

[

\text{Humidity Ratio Difference (lb)} = \frac{28 \text{ grains}}{7000 \text{ grains/lb}} = 0.004 \text{ lb}

]

Next, substituting the values into the connected formula gives:

[

\text{Latent Heat Load} = 1500 \text{ CFM} \times 0.004 \text{ lb} \times 60 (\text{ minutes/hour}) \times 1060 \text{ BTU/l