What do you mean by fouling factor What are the causes of fouling?
The fouling factor represents the theoretical resistance to heat flow due to a build-up of a layer of dirt or other fouling substance on the tube surfaces of the heat exchanger, but they are often overstated by the end user in an attempt to minimise the frequency of cleaning. …
What is fouling in heat transfer?
The fouling of heat exchangers may be defined as the accumulation of unwanted deposits on heat transfer surfaces. The foulant layer imposes an additional resistance to heat transfer and the narrowing of the flow area, due to the presence of deposit, results in an increased velocity for a given volumetric flow rate.
What do you mean by fouling?
Fouling is the accumulation of unwanted material on solid surfaces. The fouling materials can consist of either living organisms (biofouling) or a non-living substance (inorganic or organic).
What is the value of fouling factor for sea water?
| Water | Fouling Resistance | |
|---|---|---|
| River Water (minimum) | 0.002 | 0.001 |
| River Water (average) | 0.003 | 0.002 |
| River Water (muddy or silty) | 0.003 | 0.002 |
| Sea Water | 0.0005 | 0.0005 |
What is a fouling factor?
The fouling factor represents the theoretical resistance to heat flow due to a build-up of a layer of dirt or other fouling substance on the tube surfaces of the heat exchanger, but they are often overstated by the end user in an attempt to minimize the frequency of cleaning.
Which one of the following Cannot be determined by knowing fouling factors?
Which one of the following cannot be determined by knowing fouling factors? Explanation: Fouling factor for a new heat exchanger is zero but is never infinity for any equipment it must have some value even if the heat exchanger is old.
How does thermal conductivity depend on temperature?
The effect of temperature on thermal conductivity is different for metals and nonmetals. In metals, heat conductivity is primarily due to free electrons. In alloys the change in electrical conductivity is usually smaller and thus thermal conductivity increases with temperature, often proportionally to temperature.
What is the effect of temperature on thermal conductivity of insulating materials?
The results show that higher temperatures lead to higher thermal conductivities and the lower is the material density, the higher is the thermal conductivity. The envelope-induced cooling load for a simple building is also calculated, and it is shown that a lesser cooling load is needed for a high-density insulation.