4. How many times do we have to calculate for Pressure drop in a Shell and Tube Heat Exchanger? Explanation: For a Shell and Tube HE, we have to calculate pressure drop twice, once for the tube to check whether the equipment can handle that pressure.

The shell and tube heat exchanger in the photo above has about twelve times the efficiency than a hypothetical single-tube heat exchanger of the same size.

Heat exchangers, metal shells and tubes, work by transferring heat from one place to another. The hot flue gas heats the metal as the gas makes its way to the exhaust outlet of the furnace. As this is happening, the hot metal heats the air circulating over the exterior of the heat exchanger.

Shell and tube heat exchangers make it possible to pump materials as soon as possible, and they transfer temperatures efficiently so you can ensure the materials are at the necessary temperature without expending extra energy to do so.

Components of Shell-and-Tube Heat Exchangers

• Tubes.
• Tubesheet.
• Shell and Shell-Side Nozzles.
• Tube-Side Channel and Nozzles.
• Baffles.
• Tie-rods.

4.0 – HEAT EXCHANGERS CALCULATIONS:

1. The main basic Heat Exchanger equation is: Q = U x A x ΔTm =
2. The log mean temperature difference ΔTm is: ΔTm =
3. (T1 – t2) – (T2 – t1) = °F.
4. T1 = Inlet tube side fluid temperature; t2 = Outlet shell side fluid temperature;
5. ln (T1 – t2) (T2 – t1)

Pressure-loss form where the pressure loss per unit length ΔpL (SI units: Pa/m) is a function of: ρ, the density of the fluid (kg/m3); D, the hydraulic diameter of the pipe (for a pipe of circular section, this equals the internal diameter of the pipe; otherwise D ≈ 2√A/π for a pipe of cross-sectional area A) (m);

Baffles serve two functions: Most importantly, they support the tubes in the proper position during assembly and operation and prevent vibration of the tubes caused by flow-induced eddies, and secondly, they guide the shell-side flow back and forth across the tube field, increasing the velocity and the heat transfer …

6. Which of the following is not an example of recuperators type heat exchanger? Explanation: Recuperators are not used in chemical factories. 7.

Plate exchanger is the most efficient due to turbulent flow on both sides. High heat-transfer coefficient and high turbulence due to even flow distribution are important. However, a plate heat exchanger regenerator is restricted to low viscosities.

cross-flow heat exchanger

Allowable pressure drop designates the highest pressure drop acceptable for the system. The pressure drop is a limiting factor on the size, flow rate, and efficiency of heat exchanger design.

Known methods that could be used to improve the heat transfer in a compact heat exchanger include increasing the heat transfer surface area, increasing the flow rate, and increasing the temperature difference between cold and hot fluids.

Radiators will deliver heat into a room by radiation, but most of them will also deliver a reasonable amount of heat into the room by convection.

Car radiators are painted dull black because black color is both good absorber and good radiator of heat. The heat generated by the engine is efficiently radiated due to the dull black pain.

Windows are traditionally the worst insulated surfaces in a building shell. In the twentieth century, to combat that cold feeling and keep the room comfortably warm, radiators were always placed under a window. The rising heat of the radiator forms a kind of hot air curtain that shields you from the cold air.

The “heat exchanger” within a car or truck is the radiator, which is at the center of a motor vehicle’s cooling system. A radiator within a vehicle is an air-to-liquid style heat exchanger constructed of materials such as copper, brass and aluminum.

In principle, yes; central heating radiators are simply heat exchangers. They normally function by radiating heat into the room, as the air surrounding the radiator will be at a lower temperature than the hot water flowing inside it, and a temperature gradient will therefore exist between the two.

The car radiator shown is a crossflow heat exchanger, because the liquid is flowing vertically inside tubes and the air is flowing horizontally through the spaces between the finned tubes. Also, by the way, it is a finned tube heat exchanger because of the use of finned tubes in its construction.

A: No, the pronunciation of “radiator” as RAH-dee-ay-ter (rhymes with “gladiator”) is not unique to Queens. It’s not very common, though. Stewart (an ex-New Yorker) is familiar with it, while Pat (an ex-Iowan) can’t remember ever hearing it.

radiator. / (ˈreɪdɪˌeɪtə) / noun. a device for heating a room, building, etc, consisting of a series of pipes through which hot water or steam passes. a device for cooling an internal-combustion engine, consisting of thin-walled tubes through which water passes.

The word water is commonly pronounced /ˈwʊtər/ (with the first syllable rhyming with the word put, so that it sounds like “wooter” or “wooder”), rather than the more standard English /ˈwɔtər/. This is considered by many to be the defining characteristic of a Philadelphia dialect, even among young Philadelphians.

: one that radiates: such as. a : any of various devices (such as a series of pipes or tubes) for transferring heat from a fluid within to an area or object outside. b : a transmitting antenna.

In radiator, the coolant flows from the inlet to the outlet through many tubes mounted in a parallel arrangement. The hot water enters the radiator through the inlet port. And a fan is attached on behind the radiator to cool down the hot water in the tubes. The fan blows the air and cools down the water.

Radiator Types

• Single Panel Radiators.
• Double Panel Radiators.
• Horizontal Radiators.
• Vertical Radiators.
• Column Radiators.
• Heated Towel Rails.

The radiators are designed to heat the air in the room using convection to transfer heat from the radiators to the surrounding air. They do this by drawing cool air in at the bottom, warming the air as it passes over the radiator fins, and discharging the heated air at the top.