The value of the fouling factor for treated boiler feed water is in the range of 0.0001-0.0002 m2K/W. This value represents the resistance to heat transfer caused by the build-up of deposits or fouling on the heat transfer surfaces in the boiler.

Fouling is a common problem in boilers, especially in industrial settings where the water used for steam generation may contain impurities or dissolved solids. These impurities can precipitate or accumulate on the heat transfer surfaces, forming a layer of deposits. This layer acts as an insulator, reducing the heat transfer efficiency and increasing the energy consumption of the boiler.

To overcome the fouling problem, the boiler feed water is treated to remove impurities and prevent scale formation. The treatment process typically involves filtration, chemical conditioning, and sometimes ion exchange or reverse osmosis. By treating the water, the concentration of impurities is reduced, minimizing the risk of fouling.

The fouling factor quantifies the resistance to heat transfer caused by fouling. It is defined as the ratio of the thermal resistance due to fouling to the heat transfer coefficient of the clean surface. The lower the fouling factor, the less resistance to heat transfer and the more efficient the boiler operation.

In the case of treated boiler feed water, the fouling factor is in the range of 0.0001-0.0002 m2K/W. This range indicates that the fouling resistance is relatively low, meaning that the treated water has a minimal impact on the heat transfer efficiency of the boiler. This is a desirable characteristic as it allows for optimal heat transfer and energy efficiency.

In conclusion, the value of the fouling factor for treated boiler feed water is in the range of 0.0001-0.0002 m2K/W. This range indicates a low fouling resistance, which is desirable for efficient boiler operation.