What is the internal heat gain, in kW, from a factory with 20 kW of lighting (surface-mounted), 10 kW of running motors, and 10 people doing light benchwork?

Internal Heat Gain = 35 KW

Explanation:

The internal heat gain can be calculated as:

Internal Heat Gain = Heat gain due to lights + Heat gain due to motor + Heat gain due to people

Here, we assume an average heat gain of 500 W per person. Therefore,

Heat gain due to people = (0.5 KW) (10)

Heat gain due to people = 5 KW

Therefore, using values in the equation, we get:

Internal Heat Gain = 20 KW + 10 KW + 5 KW

Internal Heat Gain = 35 KW