Q1: For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it

ANS:D - all (a), (b) and (c).

a) Occupies smaller space: Shell and tube heat exchangers have a compact design that allows for efficient heat transfer in a relatively small footprint. This is especially advantageous in industries or applications where space is limited or where there is a need to maximize the utilization of available space. The compact nature of shell and tube heat exchangers makes them suitable for installation in various industrial settings, including refineries, chemical plants, power plants, and HVAC systems. b) More economical: Shell and tube heat exchangers are often more economical than other types of heat exchangers, such as plate heat exchangers or double-pipe heat exchangers. While the initial capital cost of a shell and tube heat exchanger might be higher compared to some other types, they typically offer better long-term value due to their durability, reliability, and efficiency. Additionally, shell and tube heat exchangers are often easier and less costly to maintain over their lifespan, further contributing to their economic advantages. c) Easy to operate and maintain: Shell and tube heat exchangers are designed with simplicity in mind, making them relatively easy to operate and maintain. Their straightforward design facilitates routine inspections, cleaning, and maintenance tasks, which helps ensure optimal performance and longevity. Additionally, shell and tube heat exchangers often have readily accessible components, allowing for quick and efficient troubleshooting and repair if needed. This ease of operation and maintenance contributes to reduced downtime and operating costs over the lifetime of the heat exchanger. Overall, the combination of compact size, cost-effectiveness, and ease of operation and maintenance makes shell and tube heat exchangers a preferred choice for applications requiring large heat transfer areas. The correct answer is: d) all (a), (b) and (c). Shell and tube heat exchangers are preferred for large heat transfer area requirements because they offer several advantages: a) They occupy smaller space compared to other types of heat exchangers, making them suitable for installations where space is limited. b) They are typically more economical in terms of initial cost and long-term operating costs compared to other types of heat exchangers. c) They are relatively easy to operate and maintain due to their simple design and accessibility for cleaning and maintenance tasks.