In SI units, fouling factor is expressed in

ANS:A - m²°K/W

In SI units, the fouling factor is expressed in m2°C/W (square meters per degree Celsius per watt). Explanation:

• The fouling factor represents the thermal resistance caused by fouling or deposits on heat transfer surfaces.
• It indicates the additional thermal resistance encountered by heat transfer due to the presence of fouling materials.
• The fouling factor is defined as the temperature difference across the fouled surface divided by the heat flux.
• The units of the fouling factor are typically square meters per degree Celsius per watt (m2°C/W), which represent the thermal resistance per unit area.
• This unit indicates the additional temperature difference (in degrees Celsius) per unit area (in square meters) per unit heat flux (in watts).