35. Types of Fouling that can occur in heat exchangers: A. Micro-fouling B. Macr
ID: 703458 • Letter: 3
Question
35. Types of Fouling that can occur in heat exchangers: A. Micro-fouling B. Macro-fouling C. Pseudo-Fouling D. A and B 36. In Evaporative Cooling loops we should consider the Particulate Fouling Factor (PFF) due to the constant ingression of solids. A. TRUE B. FALSE 37. Heat exchangers are devices that provide the flow of thermal energy between two or more fluids at different temperatures, Used in wide range of applications. A. TRUE B. FALSE 38. Types of Micro-fouling occurring in a heat exchanger based on poor maintenance A. Biological growth and Algae B. Bacteria and Mussels C. Rust and Mineral deposits (Example- Calcium Carbonate) D. All of the above E. A and B ONLY 39. When glass is spun into fine fibers, the trapped air makes a thermal insulator. A. TRUE B. FALSEExplanation / Answer
35. Ans
option c is correct.
there are two types of fouling in a heat exchanger
(a) microfouling, which is the result of the growth of microorganisms on surfaces. microfouling is mainly due to algae, bacteria, mussels etc. (b) Macrofouling, which is caused by the coarse matter. coarse matters can be either inorganic or of biological origins, such as animals and plants. Macrofouling is due to sand, silt, scale formation, rust or mineral deposits.
36.Ans
option a is correct. In Evaporative Cooling loops we should consider the Particulate Fouling Factor (PFF) because solids can cause blockage due to a constant flow of solids.
37.Ans
option A is correct because Heat exchanger is a thermal heat transfer device that exchanges the thermal energy from one fluid and transfers it to another at different temperatures.
38.Ans
an option E is correct because microfouling is the result of the biological growth of microorganisms on surfaces of a heat exchanger and microorganism include algae, bacteria, mussels etc.
39.Ans
option a is correct. Small pockets of air between the glass act as a thermal insulator because heat energy can't flow through them.
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