What is fouling factor formula?

The fouling factor is the reciprocal of the heat transfer coefficient of the layer formed due to the fouling. The fouling factor is denoted by the symbol Rf . Therefore as per the definition, it is given by, Rf=1h.

Which has highest fouling factor?

1. Which one is having the highest value of fouling factor? Explanation: Fouling factor for liquid gasoline is 0.0008 while that of clean river, sea water and distilled water are 0.0002, 0.0001 and 0.0001 respectively.

What is the unit of fouling factor?

m²°K/W.

What does higher fouling factor mean?

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 does fouling factor depend on?

Fouling factor (or dirt factor) definition It is also often referred to as the ‘dirt factor’. It normally depends on the process fluid or service on any side (shell or tube) of the heat exchanger. Fouling or dirt factor is used for calculation of the overall heat transfer coefficient of a heat exchanger.

Does fouling factor depend on temperature?

For biological fouling, the rate initially increases with temperature [11] o up to about 30-40 C. Foulant organisms are killed at high temperature and, thus, the rate of biological fouling decreases with increasing temperature.

What is significance of fouling factor?

The fouling factor represents the theoretical resistance to heat flow due to the buildup of a fouling layer on the tube surfaces of the heat exchanger. In practice, fouling factors are often overstated by the end user in an attempt to minimize the frequency of cleaning.

How does fouling affect pressure drop?

The fouling causes pressure drop increases by reducing the area in which the product can flow. In dairy products generally, proteins, fats, sugars, and minerals can come out of solution and deposit on heat exchanger surfaces and foul channels.

What causes fouling?

Several variables contribute to fouling, including water pH, product viscosity, and the roughness of component surfaces, among many others. Together, the variables can be expressed as a fouling factor that numerically represents resistance to heat transfer — or thermal resistance — in your system.

Why do we use fouling factor?

Fouling increases with increasing temperature and decreasing velocity. As we can see fouling factor decreases the overall heat transfer coefficient deteriorating the performance of the heat exchanger. Therefore, the Fouling factor is used in heat exchanger design as a safety factor.

Which of the following factors affect fouling?

Four factors were found to affect fouling directly: insufficient space allowance, the flooring design of the pen, the thermal climate and pigs’ earlier experience.