Flue Pipe Heat Exchanger

• Customized: Customized
• Certification: CE, ISO, RoHS
• Sectional Shape: Square
• Material: Stainless Steel
• Transport Package: Wooden Case
• Specification: Stainless Steel
• Model NO.: FP04
• Trademark: DGXT OR OEM
• Origin: China
• HS Code: 84195000
• Production Capacity: 100000pieces/Year

Product Description

                                                                        Flue pipe heat exchanger 

Abstract

A heat exchanger is mounted external to a section of flue pipe or is an integral part of a section of flue pipe. The heat exchanger preheats a domestic hot water supply and boosts the return water temperature prior to reentry to the furnace coil. The heat exchanger reduces fuel use, pollution and wear of the furnace and burner. A typical heat exchanger installation includes an oil or gas burner located on a furnace or boiler having a flue pipe leading to a gaseous outlet, such as a masonry chimney. A short vertical flue section leads to a draft-regulating damper. The flue heat exchanger may be a coil of tubing wrapped around flue section, such that the tubing picks up heat from the heated flue gasses. Preheated water exits from the heat exchanger.


used for heat exchanger

A double-pipe heat transfer exchanger consists of one or more pipes placed concentrically inside another pipe of a larger diameter with appropriate fittings to direct the flow from one section to the next. One fluid flows through the inner pipe (tube side), and the other flows through the annular space (annulus).

An Overview and History of Heat Pipes

Heat Pipes are heat dissipation components that are capable of transferring heat from one location to another relatively quickly by utilizing the phenomenon of thermal energy (latent heat) being absorbed when a liquid changes state into a gas, and being released when a gas changes state into a liquid. With a liquid (referred to as the working fluid) sealed inside a metal pipe enabling operation without use of external power, heat pipes possess a long operational life. In general, when the temperature difference between source and transmission destination locations is small, heat dissipation components and devices are not very efficient, but heat pipes can perform relatively well even in such circumstances. Their thermal conductivity (ease of heat transfer) can be up to an order of magnitude more than copper or silver, which are already known for their high thermal conductivity, and can even exceed that of diamond, which has the highest thermal conductivity of all materials.

The Structure and Mechanisms of Heat Pipes

 

Heat pipes are constructed of metal pipes made of copper, aluminum or other metals with high thermal conductivity, sealed inside which is a small amount of liquid called a working fluid (e.g., pure water) and a capillary structure (wick). A vacuum is created inside so as to seal in the working fluid and its vapor, and to facilitate the vaporization and condensation process.

When one end of the heat pipe is situated to be in contact with a heat source, its working fluid evaporates, absorbing latent heat in the process, and the resulting vapor moves to a lower temperature section of the pipe. The working fluid in the area with the relatively low temperature condenses, releasing the heat, and returns to liquid form. This is the mechanism by which heat is carried (i.e., transferred) from a high-temperature are to a low-temperature area. This working fluid that had condensed into liquid form returns to the heat source through the wick by the process of capillary action. This cycle of vaporization, liquefaction and transfer of the working fluid occurs very rapidly and continuously. The system requires neither power nor maintenance, incurs no operation costs, and can operate for long periods of time.

The Variations of Heat Pipes

Heat pipes have been generally constructed in the shape of long, thin cylinders (tubes) of a certain size, but as the recent trend in electronic devices has been to become ever smaller, thinner, and lighter, we are seeing more instances of heat pipes that are being produced with compact and thin (flattened like a squished pipe) shapes. In general, factors that contribute advantageously to the ability to carry heat are a large pipe diameter, being rounder rather than flattened, and being unbent rather than bent, but the larger the pipe, the more space it takes up and the heavier it is. It is wise to choose the product that is the most optimal for considerations such as the heat generated by the heat source, and the specific application. Here are some of the variations of heat pipes.

Variations of Pipe Materials

Copper pipe
Copper pipe is easily bent and flattened in the manufacturing process
Products in a large variety of sizes are easily obtainable

Aluminum pipe
Light in weight as aluminum itself is lighter than copper
Even easier to process in manufacturing than copper

Stainless steel pipe
Can be used with naphthalene working fluid
Slightly difficult to process in manufacturing due to being heavier than copper and aluminum

Another Value Proposition of Vapor Chambers Over Heat Pipes

Heat Pipes and Vapor Chambers operate using the same fundamental working principle and they have a similar thermal conductivity, but the metal pipe composition of Heat Pipes makes them a little bit difficult to incorporate inside tight spaces, and their heavy weight makes them undesirable for electronic devices that need to be as light as possible. This is where Vapor Chambers have an advantage. They are light in weight, and with a thickness of less than 1mm, they can be very thin.

Vapor Chambers are thin sheet-like heat dissipation components made of metal. They have very high thermal conductivity and their operating principle is the same as that of heat pipes. Generally, Vapor Chambers that employ meshes have a fine capillary structure (wick) contained inside that is filled with a working fluid such as pure water. The internal capillary structure of DNP's Vapor Chamber, on the other hand, is characterized by having a form that is made to be extremely fine and precise by means of using etching technology. When one end of a Vapor Chamber is situated to be in contact with a heat source, its working fluid evaporates, absorbing latent heat in the process, and the resulting vapor moves to a lower temperature area where it releases the heat and returns to liquid form. This working fluid returns to the heat source through the wick by the process of capillary action. This cycle is very short and continuous, and requires not external power.



 Flue gas heat exchanger for steam boilers
With the effective recovery of flue gas heat, you can save up to 14% on fuel and, at the same time, reduce emissions. A flue gas heat exchanger, also called an economiser, is part of the standard equipment for energy-optimised and environmentally friendly boiler operation.

• Effective heat recovery and reduction of flue gas losses
• Maximum efficiency gain when using condensing technology
• Fuel savings of up to 7%, or up to 14% when using an additional downstream condensing heat exchanger
• Intelligent control for a long service life and high level of efficiency
• Compactly integrated into the boiler or as a stand-alone version for simple retrofitting
• Feed water cooling or combustion air preheating as alternatives to the condensing heat exchanger