What is the BTU loss from a 5% blow down of a boiler operating at 400F water?

To determine the BTU loss from a 5% blowdown of a boiler operating at 400°F, it is important to analyze the processes involved in boiler blowdown and the characteristics of the water under those operating conditions.

When a boiler undergoes blowdown, a certain percentage of water is drained from the bottom of the tank to remove impurities and maintain water quality. This process results in the loss of sensible heat, as the water being discharged is heated to the temperature at which the boiler operates—in this case, 400°F.

To find the BTU loss for a 5% blowdown, we start by establishing the total volume of water in the boiler and the heat content of that volume at the operating temperature. The heat content is measured in BTUs per pound of water.

Assuming a certain volume of water in the boiler, a 5% blowdown would equate to a specific volume (or weight, considering the density of water) exiting the system, which would then be calculated to give the total BTU loss. Typically, the BTU loss can be determined with calculations involving specific heat, mass flow rate, and temperature.

Taking into account typical values for operating conditions—including the heat content of water and the specific calculations