Graham Heat Exchangers

• Customized: Customized
• Certification: CE, ISO, RoHS
• Sectional Shape: Square
• Material: Stainless Steel
• Transport Package: Wooden Case
• Specification: Stainless Steel
• Model NO.: P26 FLOW PLATE
• Trademark: DGXT OR OEM
• Origin: China
• HS Code: 84195000
• Production Capacity: 100000pieces/Year

Product Description

                                                                 Graham heat exchangers
 

Heat Exchanger Example

Model	Corrugated angle	Center distance	Size	Corrugated depth	DN	Cleat	Splint size (W*H)
RX0.08	120°	416*86	497*168	3.0	50Inner	20mm	235*525
M6-0.15	126°	496*140	604*250	3.0	DN50/DN65	25mm	342*694
RX0.16	120	565*155	665*248	3.6	DN40/DN50	25mm	320*710
M6-1-0.19	126°	639*140	750*250	3.0	DN50/DN65	25mm	342*842
M6-2-0.25	126°	886*140	1000*250	3.0	DN50/DN65	25mm	380*1104
M6-2-0.25-SH	126	886*140	1000*250	2	DN50/DN65	25mm	380*1104
RX0.3	120	875*180	1000*303	3.6	DN65	30mm	400*1074
RX1001-0.33	120°	716*223	875*375	3.7	DN80-DN100	30mm	490*1126
RX1002-0.46	1200	1058*223	1219*375	3.7	DN80-DN100	30mm	500*1478
M10-S-0.33	57°121°	720*223	875*375	4.0	DN80-DN100	30mm	490*1126
M10-L-0.45	57°121	1047*223	1205*375	4.0	DN80-DN100	30mm	500*1478
RX1502-0.61	120°	1000*290	1219*500	3.7	DN125-DN150	35mm	610*1488
RX1503-0.75	120°	1280*290	1500*500	3.7	DN125-DN150	35mm	610*1769
M15MD1-0.45	61°123°	698*298	906*500	4.0	DN125-DN150	35mm	610*1153
M15MD2-0.55	61°123°	897*298	1105*500	4.0	DN125-DN150	35mm	610*1352
M15MD3-0.70	61°123	1195*298	1403*500	4.0	DN125-DN150	35mm	500*1647
M15M-0.75	61°123°	1294*298	1502*500	4.0	DN125-DN150	35mm	610*1746
M15BD-0.61	70°130°	1012*298.5	1220*500	2.6	DN125-DN150	35mm	610*1448
M15B-0.75	70°130°	1294*298.5	1502*500	2.6	DN125-DN150	35mm	610*1746
Model	Corrugated angle	Center distance	Size	Corrugated depth	DN	cleat	Splint size (W*H)
RX2001-0.75	120	970*345	1234*610	3.7	DN200	40mm	735*1576
RX2002-1.08	120°	1515*345	1778*610	3.7	DN200	40mm	735*2126
M20MD-0.94	49132°	1229*353	1500*625	4.0	DN200	40mm	736*1764
M20M-1.1	49132°	1479*353	1750*625	4.0	DN200	40mm	736*1994
T20BD-0.96	70°126.5°	1267.5*353	1540*625	2.0	DN200	40mm	756*1744
T20B-1.1	70°126.5°	1478*353	1750*625	2.0	DN200	40mm	756*1994
RX2501-1.06	120°	1096*436	1415*750	3.7	DN250	45mm	870*1765
RX2502-1.33	120°	1451*436	1772*750	3.7	DN250	45mm	870*1260
MX25D1-1.0	56120.5°	1013*439	2252*750	4.0	DN250	45mm
MX25D2-1.34	56120.5	1476*439	1789*750	4.0	DN250	45mm
MX25M-1.69	56120.5°	1939*439	1326*750	4.0	DN250	50mm
MX25B-1.69	127.5	1939*439	2252*750	2.6	DN250	50mm
RX3002-1.55	120°	1385*480	1772*868	3.7	DN300	55mm	1062*2132
M30A-1.5	67°127°	1085*596	1493*1000	3.4	DN300-DN350	60mm	1129*1860
M30B-1.86	67°127	1446*596	1854*1000	3.4	DN300-DN350	65mm	1129*2200
M30C-2.3	67127°	1842*596	2250*1000	3.4	DN300-DN350	70mm	1129*2600
TL35S-2.57	128	2178*578	2591*991	7.5	DN300-DN350	80mm	3000*1200
T45A-2.6	60°118°	1528*720	2060*1250	4.0	DN400-DN450	80mm	1430*2440
T45B-3.2	60118°	1998*720	2530*1250	4.0	DN400-DN450	90mm	1420*2970

Here are a few examples of Heart exchangers:

• Air preheaters,
• economizers,
• evaporators,
• superheaters,
• condensers, and
• cooling towers

Classification of Heat Exchanger

Heat exchangers are typically categorized based on their flow configuration and construction type. The most basic heat exchanger has hot and cold fluids moving in the same or opposing directions. Heat Transfer Equipment can be classified into the following types based on its functionality:

• Recuperative
• Regenerative or Storage Type
• Direct Mixing Type

Recuperative

This is the most common type, in which heat is transferred between fluids separated by a barrier.

Regenerative or Storage Type

In this case, some material is heated by a hot fluid. Then the hot fluid flow is stopped. Cold fluid now flows over the hot solid and gets heated. This type is used for air heating in steam plants. This type is also used in solar heating homes.

Direct Mixing Type

In this case, the fluids mix and reach a common temperature. This type is rarely used.

Download Formulas for GATE Mechanical Engineering - Fluid Mechanics and Machinery

Types of Heat Exchangers

Heat exchangers are available in various designs, depending on the design characteristics. The following are some of the more popular variations used in the industry:

• Shell and tube heat exchanger
• Double pipe heat exchanger
• Plate heat exchanger
• Condensers, evaporators, and boilers

Shell and Tube Heat Exchanger

A single tube or a sequence of parallel tubes is encased within a sealed, cylindrical pressure vessel in a shell and tube heat exchanger. One fluid travels through the smaller tube(s), while the other flows around its/their outsides and between them within the sealed shell. Finned tubes, single- or two-phase heat transfer, countercurrent flow, co-current flow, or crossflow arrangements, and single, two, or multiple pass configurations are some of the other design features available for this type of heat exchanger.

Double Pipe Heat Exchanger

Heat exchangers with two or more concentric, cylindrical pipes or tubes are known as double pipe heat exchangers (one larger tube and one or smaller tube). One fluid goes through the smaller tube(s) while the other fluid flows around the smaller tube(s) within the bigger tube, according to the shell and tube heat exchanger's design. Because the fluids remain separated and flow via their channels throughout the heat transfer process, the design requirements of a double pipe heat exchanger contain characteristics from the recuperative and indirect contact types.

Plate Heat Type Heat Exchanger

Plate heat exchangers are made up of several thin, corrugated plates that have been grouped. Each pair of plates produces a channel for one fluid to flow through, and the pairs are stacked and connected (by bolting, brazing, or welding) to create a second passage for the other fluid to flow through. There are some modifications to the typical plate design, such as plate-fin or pillow plate heat exchanger. Fins or spacers between plates in plate-fin exchangers allow for different flow configurations and more than two fluid streams to pass through the device.

Condensers, Evaporators, and Boilers

Heat exchangers that use a two-phase heat transfer mechanism include boilers, condensers, and evaporators. During the heat transfer process, one or more fluids in two-phase heat exchanger change phase, either from liquid to gas or from gas to liquid. Condensers are heat-exchanging devices that take a hot gas or vapour and cool it down to the point of condensation, converting it to a liquid. In evaporators and boilers, on the other hand, the heat transfer process converts the fluids from liquid to gas or vapour.

Advantages of Heat Exchanger

There are various advantages of using a heat exchanger such as they are not very expensive. All the advantages of a heat exchanger are listed below:

• Heat exchangers are typically less expensive to maintain.
• These are subjected to extreme working pressures and temperatures.
• You may get an efficiency of roughly 80% with the right-sized heat exchanger.
• They are basic, low-maintenance, small in size, and easy to clean.
• When dismantling, there is no need for additional space.
• Heat exchangers made of shell and tube are less expensive than plate-type heat exchangers.

Disadvantages of Heat Exchanger

Apart from advantages, there are some disadvantages to using a heat exchanger. All the disadvantages of the heat exchanger are provided below:

• Leakage and pressure decrease in the system are the main downsides.
• The initial cost of the plate type is expensive due to the high cost of titanium plates.
• When disassembling and assembling, the operator must be cautious.
• The pressure in the cooler is increased by over-tightening the clamping bolts.
• The tube cooler's capacity cannot be increased, which is also a disadvantage.

Applications of Heat Exchanger

Heat exchangers can be used in various places as they can be used to warm a cold fluid entering a hot process system by transferring heat from the system's hot fluid. Check out some applications of the heat exchanger shown below:

• Heat exchangers are most commonly used to transfer heat from one medium to another.
• Heat exchangers of the shell and tube types are utilized in a wide range of industries.
• The spiral heat exchanger is used for digester heating, heat recovery, and effluent cooling, among other things.
• These are commonly used to heat and cool food and beverages.

To be able to select a heat exchanger, we need to know;

• Primary circuit fluid type, temperature and flow rate (usually the hot fluid)
• What you want to take out of the primary circuit (Heat dissipation or a target outlet temperature)
• Secondary circuit fluid type, temperature and flow rate (usually the coolant)

The fields above are only the basics. When putting an enquiry together you should also make Thermex aware of any pressure loss limitations and any other special requirements.

Please click here to download the Thermex data sheet template which highlights the required fields for heat exchanger selection. The data sheet should also be saved and sent to us if you require a quotation for a heat exchanger.

 

Plate Fin Exchangers consist of fins or spacers sandwiched between parallel plates. The fins can be arranged so as to allow any combination of crossflow or parallel flow between adjacent plates. It is also possible to pass up to 12 fluid streams through a single exchanger by careful arrangement of headers. They are normally made of aluminum or stainless steel and brazed together. Their main use is in gas liquefaction due to their ability to operate with close temperature approaches.

Lamella heat exchangers are similar in some respects to a shell and tube. Rectangular tubes with rounded corners are stacked close together to form a bundle, which is placed inside a shell. One fluid passes through the tubes while the fluid flows in parallel through the gaps between the tubes. They tend to be used in the pulp and paper industry where larger flow passages are required.

Spiral plate exchangers are formed by winding two flat parallel plates together to form a coil. The ends are then sealed with gaskets or are welded. They are mainly used with viscous, heavily fouling fluids or fluids containing particles or fibres.

 

This category of heat exchanger does not use a heat transfer surface, because of this, it is often cheaper than indirect heat exchangers. However, to use a direct contact heat exchanger with two fluids they must be immiscible or if a single fluid is to be used it must undergo a phase change. (See Direct Contact Heat Transfer.)

The most easily recognizable form of direct contact heat exchanger is the natural draught Cooling Tower found at many power stations. These units comprise of a large approximately cylindrical shell (usually over 100 m in height) and packing at the bottom to increase surface area. The water to be cooled is sprayed onto the packing from above while air flows in through the bottom of the packing and up through the tower by natural buoyancy. The main problem with this and other types of direct contact cooling tower is the continuous need to make up the cooling water supply due to evaporation.

Direct contact condensers are sometimes used instead of tubular condensers because of their low capital and maintenance costs. There are many variations of direct contact condenser. In its simplest form a coolant is sprayed from the top of a vessel over vapor entering at the side of the vessel. The condensate and coolant are then collected at the bottom. The high surface area achieved by the spray ensures they are quite efficient heat exchangers.

Steam injection is used for heating fluids in tanks or in pipelines. The steam promotes heat transfer by the turbulence created by injection and transfers heat by condensing. Normally no attempt is made to collect the condensate.

Direct heating is mainly used in dryers where a wet solid is dried by passing it through a hot air stream. Another form of direct heating is Submerged Combustion. This was developed mainly for the concentration and crystallization of corrosive solutions. The fluid is evaporated by the flame and exhaust gases being aimed down into the fluid which is held in some form of tank.