What is the heat input rate (BTU) per hour for a natural gas flow of 80 cu ft/hr?

The heat input rate in BTUs per hour for natural gas is determined by using the heating value of natural gas, which is typically around 1,000 BTUs per cubic foot. To find the total BTU input, you multiply the flow rate in cubic feet per hour by the heating value.

In this case, for a flow rate of 80 cubic feet per hour:

80 cu ft/hr × 1,000 BTUs/cu ft = 80,000 BTUs/hr.

Thus, the calculation shows that the heat input rate is 80,000 BTUs per hour. This aligns perfectly with the definition of how the energy content of gas is measured and quantifies how much heat energy is being delivered by the gas flow at that given rate.