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The Uses and Components of a Plate Heat Exchanger

The Uses and Components of a Plate Heat Exchanger

A heat exchanger is a tool that transfers heat from one source to another. The two devices are either touching or separated by a wall. The exchanger is used to control temperatures within sewers, air conditioners or refrigerators. It is commonly used to cool cars and buildings. A significant number of industries need exchangers every day to prevent fires and damage.

The heat exchanger is classified based on the type of flow. A parallel flow exchanger has the liquids coming in the same end and flowing in the same direction. A counter flow has liquids moving from both ends. A cross flow exchanger has perpendicular movement. The unit is used for all residential or industrial needs that involve heating and cooling liquids. Tanks of water are used to conduct energy. Any industry that uses liquids, such as food or medical, may use plate exchangers when necessary.

The plate heat exchanger is one type of device. The heat is transferred between metal plates. Unlike a traditional exchanger, the plate type is preferred because the fluids are spread out over more surfaces, which increases the exchange speed. The metal pipes of this heat exchanger are used to heat the fluids. The stainless steel plates are designed to resist the effects of very high temperatures. The exchanger comes with temperature controls. Maintaining a low temperature is a way to prevent overheating.

The plate exchangers differ according to the external and internal parts. The welded plate exchange has the plates welded together. The brazed plate model is constructed through vacuum brazing. Different exchangers have different internal parts. In many cases, smaller parts work better. Some chambers are designed thinly so that most of the liquid touches the plate, which improves the heat transfer. Smaller coils are better able to stand the extreme pressures.

The use of a plate heat exchanger is beneficial in numerous ways. It is durable, portable and easy to maintain. The whole system works with different fluids and does not take up excessive space. The plates are easy to detach and clean. Select the best exchanger by knowing about the various designs and operating environments.

What is gasketed plate heat exchangers used for?

The most common uses for a gasketed plate heat exchanger includes: pharmaceutical plants, dairy farms, air conditioning systems and food or beverage companies. While the metal plates are used to transfer the heat from one liquid to another, the high quality gaskets are used to keep the exchanger free of leaks and direct the flow of the liquid that is running through them. While the even number of channels have one liquid flowing through them, the odd number of channels has the other liquid flowing through them; so the liquids never come into direct contact. This type of heat exchanger can be expanded easily be added more plates or the size can be decreased by removing the required number of plates needed. The output, temperature range and pressure drop is all controlled by the number of plates used. A gasketed heat exchanger can also be opened with standard tools for maintenance or repairs.

Wort Plate Chillers are the Way to Go for your Home Brew

Wort Plate Chillers are the Way to Go for your Home Brew

For serious homebrewers, your beer is a source of pride and accomplishment. In order to maintain the sense of satisfaction that you receive from brewing the perfect lager, it is important to choose the best chilling equipment for your brewing process.

No brew can take place without the wort chilling process taking place. Hot wort must be cooled outside of the brew pot, and dedicated chiller equipment is almost always necessary for this process. The only exception is if the brew is very small, and some home brewers will use ice tubs. However, this can only take place with partial boils, a full boil requires the use a chiller. This is where the necessity of a wort chiller comes in.

Wort chillers are used to lower the temperature of a metal surface with cold water flow for the cooling of the hot wort after the boiling process. There three kinds of wort chillers to choose from. The immersion chiller is basically a set of copper tubing that is cooled and immersed in the wort. Only the outer tubing is relied upon for the chilling process. Then, there are counterflow chillers, which are less sanitary are usually homemade from a garden house of type of tubing. In the instance of counterflow chilling, the actual cooling process takes place inside the tubing which makes sanitization difficult. It seems the wort plate chiller carries the most advantanges. The plate wort chiller takes up much less space than a counterflow chiller, is much more sanitary and allows the heat exchange to happen over a metal plates rather than inside a hose. The plate wort chiller also has the most efficiency in water use and does require any disassembly for cleaning and sanitization.

 

All in all, for the serious homebrewer, the wort plate chiller is the way to go. It carries the least amount stress, is the easiest to care for and allows for rapid and efficient wort chilling. It is also the most sanitary of the three options, which makes for a better tasting, purely flavorful brew!

Types of tubes employed in heat exchangers

Types of tubes employed in heat exchangers

There are multiple different kinds of tubes used in the construction of a heat exchanger.

Type 1: Plain tube. There are several (3) forms of plain tubes which are used in
the construction of a heat exchanger: (a) Straight tubes; (b) U-tubes with U-bend; (c)
coiled tubes. Furthermore, plain tubes can be welded or seamless. The welded tubes are
made from strip material which is rolled into cylindrical shape and then automatically
welded per specification. The seamless tubes are subdivided into two types: extruded or
hot pierced. There are numerous materials which can be used in making the welded and
seamless tubes, however copper and copper alloys are used only in the manufacturing of
the seamless type. Because seamless tubes are considered to be of better eminence, they
are more costly than the welded type. One of the reasons who one may use plain tubes
in the making of the heat exchanger is that in comparison to other types of tubing it is
cheapest and easiest to handle.

Type 2: Finned tubes: These tubes get their name from the way they look. These
tubes in actuality have fins attached to their tubular surface. The fins can be attached
either on the outside or the inside of the tube. The fins are positioned in the following
positions: longitudinal, radial, or helical. Finned tubes are idea for use where at least one
of the fluids in the heat exchanger is gas.

Type 3: Duplex tubes aka bimetallic tubes—the bimetallic tubes are made of
two separate tubes which are made of different materials. One of the tubes is larger in
diameter than the other. The smaller tube through mechanical means is placed within the
larger tube ensuring that there is no gap between the tubes. To avoid the presence of a
gap, shrink fitting is used. The bimetallic tubes are often used in areas where other types
of tubes and metals are not compatible with the corrosive nature of the tube-side and
shell side fluids. Hence when selecting metals for the construction of the tubes one
should consider the rate of corrosion to ensure that both tubes will corrode at similar rate.
There are roughly over one hundred different types of material combinations available.
In addition to considering the material used to construct the bimetallic tube, one should
also pay close attention to selecting a tube with ideal and compatible thickness. Because
there is a perfect contact between the inner and the outer tubes, the thickness of the tubes
should be based on the basis of strength of the softer of the two materials.

Type 4: Enhanced surface tubes. These tubes increase the heat transfer coefficient
which is accomplished by two techniques:

a. The surface of the tube is contoured and or grooved so that ridges and
valleys are formed. Such tubes are often used in condensers. The increased heat
transfer coefficient results from the condensate floating into the valleys leaving
only a thin film on the ridges.
b. The surface is prepared from special coating providing large number of
nucleation sites which are to be used in boiling operations. For the maximum heat
transfer it is suggested that the tubes should have the largest possible surface area
per unit value. The professionals in the field of heat exchangers have determined
that cylindrical tubes are preferred to non cylindrical although some of the non-
cylindrical tubes have larger surface area per unit volume. Cylindrical tubes
are ideal at withstanding the fluid pressure. However, at low pressure settings,
especially in dealing with gases, non-cylindrical tubes are best to be used.

Tube headers and their advantage

Tube headers and their advantages

One may ask what is a tube header? Tube headers refer to the front end where the tube
side fluid enters the exchanger. There are primarily three types of tube headers: (1)
channel; (2) bonnet; (3) high pressure header.

(1) Channel tube header is either an integral with the shell or bolted to it. It is
advantageous due to its structure that its cover allows access to the tube without causing
any disturbance to the piping connections.
(2) Bonnet tube header is fastened to the shell and does not have a separate cover.
The absence of the cover results in an intricate access to the tubes as the tube header
needs to be removed for that purpose. Furthermore, the removal of tube header causes a
disturbance in piping connectors. The advantage of this tube header is that it is relatively
cheaper than the removable channel with a cover.

(3) The high pressure header is specifically designed and implemented in
constructions dealing with high pressure. For this reason, generally, the channel barrel
and the tubesheet are generally fashioned.

ARTICLE 2

ARTICLE 2

Typical types of shell and tubing construction

There are three principal types of shell and tubing construction: (1) Fixed-tubesheet type;
(2) U-tube type; (3) Floating-head type.

1. Fixed tubesheet type: In creation of the fixed-tubesheet one can use multiple number
of tube passings, however only two shell passes are often permitted. It is not uncommon
that the tubing completely permeates the shell, hence impeding easy maintenance and
repair. Maintenance and repair can be accomplished by accessing the tube side but not
the shell. To maintain the shell one can use clean and nonfouling fluids. Fixed- tubesheet
construction is primarily used in areas where the thermal stress is low.
2. U-tube type: this construction is ideal for high pressure and high temperature
applications. U- tube constructions are frequently used in kettle reboilers, tank suction
heaters and evaporators. U-tube highly desired because of its structure where each
tube is free and hence is able to expand to accommodate thermal expansion. The “U”
shape structure enables the shell inlet nozzle to be located beyond the tube bundle. The
U shaping further enables the construction to reduce the erosion damage as well as
minimize vibration. The tube is easily maintained as the tube bundle is removable. Repair
and partial replacement of the inner structure is intricate as the inner single
tubes cannot be removed from the bundle without first removing the outer tubes.
3. Floating-head type: there are four types of this construction. Each has its own
advantages and disadvantages which will be discussed in detail below.
a. Packed-lantern –ring- type: this structure is generally used at below 375F (190
C) and

300 PSI for the use with steam, water, air, oil etc. In the construction there are separate
packing rings at the floating tubesheet containing the shell and the tube side of the
construction contains the tube side fluids. The distance between the shell and the outer
tube limit (OTL) is larger than at the fixed tubesheet or the U-tube type exchanger. If
a leakage should occur, the structure enables the liquid to drain onto the floor surface
through the weep holes and not to intermix with the other fluids within the structure
tubing. This is one of the least costly removable bundle type of exchanger construction.
b. Internal-floating-head- type: This type of construction is used in the petroleum
industry.
the differential expansion of the tubes is accounted for by the movement of the rear
floating tubesheet.
c. Outside packed floating head type: the shell side pressure and temperature can
be 600
F (316 C) and 600 PSI (4137 kPa). There are no similar restrictions on the tube side
of the construction. The shell to OTL clearance is maximum in this type of exchanger.
This structure is highly preferred among the removable bundle type constructions in the
chemical industry.
d. Pull-through-floating-head-type: It is very similar to the internal-floating-
head-type in its construction with difference in the floating head cover which is attached
directly to the floating tubesheet. In this construction the shell-to –OTL clearance is
very large. Seal strips are employed to reduce the bypassing of the shell- side fluid. The
maintenance and repair time of the pull-through-floating-head-type is minimal.

In some of the Floating-head type exchangers, there is a problem of leakage which results
from the tilting of the tubesheet . Numerous manufacturers have addressed this issue by
manufacturing precise matching and accurate tilt-up, spacing ring or second clamp ring at
90° from the first one to attain leak tight joints.

what is a plate heat exchanger and its advantages?

What is a plate heat exchanger and its advantages?

It is a type of exchanger where the flow passages are made of ridged plates. Multiple
plates are positioned vertically and are held together by gaskets. Within the plates, on
either side, there are two fluids which flow in countercurrent direction.

The heat transfer occurs in the following ways: the fluids which flow on either side of the
plate, spreads out over the plate itself and hence covers a larger surface are as compared
to a conventional heat exchanger. Larger surface area results in quicker change and
transfer of heat. In other words, plate heat exchanger changes the temperature faster than
the conventional heat exchanger.

Advantages of plate heat exchanger: It is compact, easy maintained and assembled. The
heat transfer area can be changed to preference as plates can be assembled to best suit
your needs. If a leak should occur, it is easily detectable as the water accumulates on the
floor enabling one to detect the problem as soon as it occurs.

Heat Exchangers In Solar Applications Are An Essential Tool For An Efficient Solar Heating System

Millions of home and business owners across the world are learning to harness the sun’s energy to save precious environmental resources as well as money on utility bills. People are learning how to tap into a free resource and turn it into power and heating for their homes and businesses. To create a successful solar heating system Heat Exchangers in Solar Applications must be used.

The basic job of the heat exchanger sounds rather simple but is actually complex in nature. A heat exchanger is responsible for transferring heat from one liquid to another. Quite often these liquids have differences such as one may be composed of glycol and the other water. The liquids used most often need to be separated because of the different requirements of each liquids normal operating pressure.

An effective solar heat exchanger must provide an efficient transfer of heat energy between these liquids while preventing heat loss in the process. In order for a heat exchanger to provide this efficient transfer certain variables must be met. One of these variables requires having an appropriate material that creates a surface area which separates the two heat conducting liquids.

Having an appropriate flow rate between these two heat transfer liquids is equally as essential as having adequate pressure drop ratings on both sides of a heat exchanger. Manufacturers of heat exchangers include the importance of surface area increase into their plans to accommodate the fluctuating temperature difference of each liquid as they transfer heat energy between each other. This improves the efficiency of heat transfer and reduces the amount of heat energy loss when the transfer takes place.

In addition to the burden of efficiently transferring heat between the two liquids a heat exchanger must also be able to adjust and restrict the pressure drops to provide an output of desirable heat. The internal components of a heat exchanger adjusts these pressure drops at the incoming and outgoing ports of the liquids. This provides an adequate pressure brought on each side that adjusts to produce adequate heat transfer for the volume of the heat exchanger.

Studies have shown that liquids that flow in opposite directions creating a counter current flow create uniformed heat production. A heat exchanger is responsible for allowing this counter flow while exchanging heat between the two liquids and producing a radiant heat that is useful for heating both air and water. Solar heating has enabled both home and business owners to heat home and office space, water for bathing and other purposes, as well as heating swimming pools and hot tubs. It is evident that Heat Exchangers in Solar Applications are an essential variable in an efficient business or home solar heating system.

Why Get a Solar Heat Exchanger?

Why Get a Solar Heat Exchanger?

A solar heat exchanger has many advantages to other heating options. Solar heat exchangers absorb sunlight and capture it in collectors that then trap the heat. Heat is then transferred through tubes and delivered where it is needed. It is a common misconception that solar heat is only effective in certain places. While it is most effective with more sunlight, solar heat exchangers can be used anywhere. Some of the major benefits of a solar heat exchanger include: saving money, decreasing maintenance, and helping the environment.

It is easy to save money with a solar heat exchanger because they use sunlight as the energy source. This means that once the heat exchanger is installed it is virtually free of cost. It reduces the electricity bill in most households by more than half and up to eighty percent. While it does cost money to install, it quickly pays for itself by reducing the monthly bills.

Maintenance is something else that is less expensive and even less common when it comes to a solar heat exchanger. They break down less often than traditional heating systems that use coal or natural gas. The average furnace or boiler needs to be maintained regularly and costs a lot to repair but solar heat exchangers are easy to clean and take care of at a low cost.

Finally, solar heat exchangers are far more environmentally friendly than their counterparts. This is because they do not use nonrenewable fossil fuels such as coal or natural gas in order to create heat. Using a solar heat exchanger is a great way to reduce a carbon footprint and feel good about keeping the planet safe and environmentally sound.

For solar and other types of heat exchangers, visit brazetek.com/products

What is a Solar Heat Exchanger

What is a Solar Heat Exchanger
A solar heat exchanger is used to create household solar power. People who do not want to install solar systems should use exchangers. These affordable machines are effective in heating homes thoroughly. Some models are designed to work in small places. People who need solar heat, but cannot afford it, will benefit. The equipment is made in different sizes and designs. Sun energy is beneficial because it improves the environment, reduces energy bills, increases property value and increases the eligibility for incentives.

Heat exchangers are common in houses, fridges and vehicles. The machines deter excessive heating and transfer sufficient amounts to the proper places. Solar heat exchangers use the heat of the sun instead of manmade systems. It is common to use a solar heater for a swimming pool. Pool heating can lead to high costs and energy consumption. People who want to be as environmentally friendly as possible should use sun or wind power.

Using a solar heat exchanger is a good way to use nature’s power without spending a lot or making a major transformation. The sun’s power is free and renewable. Water is driven and heated by the sun. The heated water transforms into steam, which runs the turbine to create electricity. Anyone who uses it will promote eco-friendly technology. Affordable devices transform regular water heaters into solar ones. An existing system is transformed without the extra costs, space and hassles. The regular system stays active, even if there is no sun. Hot water is available at all times.

Solar units power homes without electricity. Sunlight is the main source needed. Solar heat exchangers are important units that are attached to existing systems. To create an effective sun-powered unit, it is necessary to review the size and fitting. Many companies provide a wide range of exchangers for any use. The machines require minimal maintenance because parts do not move. Many companies are available for selection, but choosing one from another is a challenge. Design and quality are valuable factors to consider when looking at the products. When the right one is chosen, it can operate for many years or decades.

Brazetek.com offers great selection of heat exchangers for solar applications.