Working Schematic Diagram
Main Application
| Heat Pump unit |
Boiler / Steam |
| Chillers |
Refrigeration |
| Waste Heat recovery |
Heating and cooling of high-purity water in areas like medical care, food, electronics and etc. |
| Cooling and heating of oils |
| Cooling and heating of oils |
Other industrial applications |
Product Parameters
Advantages of products
1.The size is compact and it is easy to install.
2. It is weight and it only accounts for 20%-30% of the shell and tube heat exchanger.
3.It is durable, and can withstand high temperature and high pressure.
4.It is not easy to deposit dirt, and high turbulence reduces the dirt coefficient, thereby reducing the number of cleaning times.
5.High heat transfer efficiency and less water consumption.
Installation Recommendations
The heat exchanger must be supported by special brackets other than the connection spigots to ensure its fixation and they must not be subject to stress or vibrations from the connected pip ework. It is advisable to place it on a platform and clamped to a solid structure using brackets shown in the picture. Connection of hydraulic hoses direct to the heat exchanger is not recommended due to pressure surges.
The heat exchanger must be mounted with vertical orientation as shown so that proper fluid drainage can take place. Even the least amount of air inside the exchanger would lead to a remarkable reduction of heat transfer effect.
Operating Recommendations
1.Freeze-up protection
Any heat exchanger could freeze up when the temperature is belowzero.Freezing up inside the heat exchanger will definitely result in structural damage and leaking. If leaking happens in the evaporator,even the compressor could be destroyed.Snch grave consequence should be paid special attention to.
The freeze-up risk is divided into two basic areas
External freezing
If evaporator or condenser is placed outdoor,the heat exchanger could freeze up in winters.To protect it from low temperature, it is imperative to install a drainage.Discharge the water when the exchanger is left unused and keep heating the water when in use. Adding glycol in the water is also an efficacious method.
Internal freezing
This only happens in the water side of evaporators.The freezing cause is the refrigerant's temperature being below zero owing to low evaporating temperature or suction pressure,low evaporator water entering temperature,fouled evaporators causing low water flow rates, and loss of refrigerant charge. Analyse by cases to solve the problems.
Methods of evaporator freeze-up protection:
a. ALP control switch should be fitted to prevent operation at low suction pressure conditions.
b. A temperature sensor fitted behind the valve can be used to stop the compressor when the valve temperature is below a certain level.
Temperature sensors can also be used to stop the compressor when the leaving water temperature approaches freezing. They must be as re-
sponsive as possible and fitted directly in the water flow as close as possible to the water outlet. Fitting on the pipe wall is not advisable for possible slow response leading to cease of effect in sensors.
c. It is recommended to turn on the cooling water flow in advance and start the compressor with an appropriate delay. A reliable flow switch to detect low water flow rates should be fitted so that it could give out warning or stop the compressor at a low water flow rate.
d. Additionally, pay attention and avoid control sensor failure .
2.Scale treatment
In daily use,scale accumulates at the water side of heat exchangers therefore regular scale treatment is a must. Variations in water quality from place to place and variations in applications of plate heat exchangers make it difficult to define in simple terms the water quality requirements for minimum maintenance. It is important to ensure the right water quality and reduce scale by establishing the requirements for local conditions or utiliing specialist water treatment companies.
The following should be paid attention to in daily maintenance.
Undissolved solids(turbid water)
If undissolved solids like sand,weeds, leaves and other fibres are in the water, the channels are easily blocked. Fibrous litters can not pass the
heat exchanger and must be disposed of. To reduce undissolved solids blocking the unit, granules should kept smaller than 0.8mm and is recommended to fit a 40-70 mesh strainer. Regular maintenance ofthis unit is required howeverto ensure continued performance.
Dissolved products
Under certain circumstance crystallized deposits of calcium and magnesium ion in the water will attach to the heat exchanger surface and scale the higher the concentration of Ca2+and Mg2* and the water temperature, the greater possiblity of scale formation.Thick scale will not only gravely affect heat transfer capability but even block the channels.As a result,to overcome nuisance tripping at start up never use this kind of water directly and always carry out water treatment beforehand.
Cleaning
Due to the diverse applications of brazed plate heat exchangers various methods of cleaning may be used. The following method is often used
for heat exchangers applied as refrigeration condensers in cooling tower circuits where poorquality water is used or poor water treatment results in heat exchanger fouling. This fouling can be corrected by chemical cleaning, reverse flushing or a combination of both. Regular reverse flushing in situ is the simplest option and may be the only treatment necessary if fouling is predominantly caused by sedimentation.If however, scaling has occurred, chemical cleaning will be necessary.This should be performed using a weak acid cleaning liquid pumped through the heat exchanger in reverse flow direction at approximately twice the normal flow rate.Remember that the cleaning acid should be circulated in reverse flow for usually 24 hours. At the completion of the cleaning process, it is important that the unit be flushed with clean water for at least 30 minutes.
3.Corrosion Protection
Stainless steel has a high resistance to most chemicals but is sensitive to chloride ion concentration so this must be limited to 280ppm or less
(lower than 55C).The copper used in the brazing process is mainly sensitive to strong acid and ammonia, so the pH must be maintained between 6 and 8. In practical application, for example, hydrochloric acid should never be used to clean the exchangers. If heat exchangers are applied in swimming pool heating, limite chloride ion concentration to 280ppm in the water. What's more, in chemical, pharmacy and other industries, solutions containing strong acid like hydrochloric acid or nitric acid and hartshorn won't be proper fluid medium.
4.Welding cooper tubing
Clean weld surface,brush on the chlorate brazing flux,using 40-50 silver-based rod for welding,the maximum temperature does not exceed 650C°. Cooling water into the water-side ,andinthe vicini ty of welding departmenttoimpose an appropriate cooling method prevents the temperature is too high, and the refrigerant-side injection with chlorine to oxidation.
Company introduction
East-Alliance Thermal Equipment Co., Ltd has been specialized in brazed plate heat exchanger for more than 16 years. As the global inventor of dust free and equal resistance brazed plate heat exchangers,East-Alliance Thermal Equipment Co., Ltd has multiple cutting-edge invention patents, mastered the core research and development technology of brazed heat exchangers, and has completely independent property rights. It is a National Science and Technology Enterprise, a Technology Innovation Fund Project, a Private Technology Enterprise in Guangdong Province, and a National High-tech enterprise.
The facility contains a complete set of professional producing and inspection equipment: punch, vacuum brazing furnace and the high-vacuum Helium leak detector, achieved to international leading level in mold design & development, and the heat exchanger technology & application. East-Alliance is an ISO 9001 and 14001 company, possessing Special Equipment manufacturing license, producing CE, UL and RoHS certificated product, which is widely used in heating and cooling industry and been exporting to over 40 countries all over the world.
Workshop
Certification
Packaging
Audited Supplier 
){kind=link}
){kind=link}