What is a tube-in-tube heat exchanger?
Exergy LLC, tube-in-tube heat exchangers consist of two tubes, an inner and an outer coiled together. This unique, compact design prevents thermal fatigue, increases efficiency and reduces the overall size. It is ideal for high temperature, high pressure and low flow applications.
How do tube-in-tube heat exchangers work?
How shell and tube heat exchangers work. Instead of transferring heat through parallel plates, shell and tube heat exchangers transfer heat between a bundle of tubes surrounded by a large shell vessel. Fluids that run through the tubes exchange heat with fluids that run over the tubes contained by the shell.
How many tubes are in a tube and shell heat exchanger?
waste heat boiler in power plant gas turbine are shell & tube type heat exchanger are also larger size and having 5000-12000 number of tubes.
What are heat exchangers PDF?
A heat exchanger is a heat transfer device that exchanges heat between two or more process fluids. Many types of heat exchangers have been developed for use in steam power plants, chemical processing plants, building heat and air conditioning systems, transportation power systems, and refrigeration units.
What is tube in tube condenser?
The Tube-in-Tube is sometimes called a double pipe or coaxial condenser. Its name reflects its design. A tube is placed within a larger tube and the ends of the larger tube are sealed. Water is circulated through one of the tubes, while the refrigerant flows through the other.
What is shell and tube evaporator?
The main function of Shell & Tube Type Evaporator is to act as a heat exchanger in a vessel form. This is mainly done to cool closed circuit for re-circulating fluid flow. The refrigerants passed through the expansion device that passed into tubes and evaporates to produce a cooling effect.
What is 2/4 shell and tube heat exchanger?
Most shell-and-tube heat exchangers are either 1, 2, or 4 pass designs on the tube side. This refers to the number of times the fluid in the tubes passes through the fluid in the shell. Two and four pass designs are common because the fluid can enter and exit on the same side.
What is pitch in shell and tube heat exchanger?
The distance between the centers of the tube hole is called the tube pitch; normally the tube pitch is 1.25 times the outside diameter of the tubes. Other tube pitches are frequently used to reduce the shell side pressure drop and to control the velocity of the shell side fluid as it flows across the tube bundle.
What is NTU in heat exchanger?
NTU is defined as:[11.74]NTU=UACminwhere U is the overall heat transfer coefficient (kW/m2K), A is the heat transfer area of the heat exchanger (m2) and Cmin is the smallest thermal capacity of the two fluids (kW/K).
What is tubular heat exchanger?
A tubular heat exchanger (THE) is used to warm or cool a product by exchanging heat between the process fluid and a service fluid, which is typically water, ice water, glycol or steam. The hot or cold service fluid flows around the tubes within the THE and heat is transferred between the product and the media.
What is tube in tube structure?
Tube-in-Tube Building generally consists of an inner tube to aid vertical transportation demand and an outer tube which comprises of dense columns and deep beams. It is the most commonly used structural system for high-rise building with more than 50 storeys.
What is the shell and tube heat exchanger in detail?
A shell and tube heat exchanger is a class of heat exchanger designs. It is the most common type of heat exchanger in oil refineries and other large chemical processes, and is suited for higher-pressure applications. As its name implies, this type of heat exchanger consists of a shell (a large pressure vessel) with a bundle of tubes inside it.
What is meant by tube pitch for heat exchangers?
Tube pitch: when designing the tubes, it is practical to ensure that the tube pitch (i.e., the centre-centre distance of adjoining tubes) is not less than 1.25 times the tubes’ outside diameter . A larger tube pitch leads to a larger overall shell diameter, which leads to a more expensive heat exchanger.
How do shell and tube heat exchanger work?
Heat is transferred by conduction through the exchanger materials which separate the mediums being used. A shell and tube heat exchanger passes fluids through and over tubes, where as an air cooled heat exchanger passes cool air through a core of fins to cool a liquid.
What are the different types of heat exchanger?
Several types of heat exchangers are used for heating one fluid and cooling another. The types of heat exchangers include the shell and tube heat exchanger, plate heat exchanger, double pipe heat exchanger, and spiral heat exchanger. Most of these heat exchangers can be counterflow or parallel flow.