Sample interview questions: Can you explain your knowledge of different types of heat exchangers used in hydronic systems and their efficiency ratings?
Sample answer:
There are several types of heat exchangers commonly used in hydronic systems, each with its own unique design and efficiency ratings. Let’s explore these heat exchangers and their characteristics:
-
Shell and Tube Heat Exchangers: This type consists of a series of tubes enclosed within a larger shell. Hot water flows through the tubes, while colder water circulates around the outside of the tubes in the shell. The heat transfer occurs through the tube walls. Shell and tube heat exchangers are highly efficient and can handle high-pressure applications, making them suitable for large-scale hydronic systems.
-
Plate Heat Exchangers: Plate heat exchangers feature a series of thin metal plates stacked together with small gaps in between. Hot and cold water flow through alternate channels, allowing for efficient heat transfer. The large surface area of the plates enables high heat transfer rates. Plate heat exchangers are compact, lightweight, and provide excellent thermal performance, making them popular for residential and small commercial hydronic systems.
-
Brazed Plate Heat Exchangers: Similar to plate heat exchangers, brazed plate heat exchangers consist of corrugated metal plates. However, these plates are brazed together, creating a permanently sealed unit. The brazed construction enhances thermal efficiency and pressure resistance. Brazed plate heat exchangers are compact, easy to install, and have a high heat transfer coefficient, making them suitable for various hydronic applications.
-
Tube-in-Shell Heat Exchangers: This type combines elements of both shell and tube heat exchangers. It consists of a small number of t… Read full answer
Source: https://hireabo.com/job/12_0_14/Hydronic%20Technician