When cooling, do not immerse the component in water for cooling. Use a damp cloth to wipe the component to accelerate cooling. To prevent the brazed plate heat exchanger from being damaged by low temperature, a drain valve must be installed in the air-conditioning unit. When using brazed plate heat exchanger , pay attention to keep the water circulating and heating, and drain the water when not in use. If necessary, ethylene glycol can be added to the water to prevent freezing.
Pay attention to the state inside the evaporator to prevent freezing on evaporator water side. Inlet water temperature is too low, water flow is too small or water is cut off, refrigerant flushing capacity is not enough, etc. Water hammer is a condition that occurs when an incompressible fluid flows through a pipe and suddenly changes its flow rate. Generally, water hammer occurs when the solenoid valve is suddenly closed. Water hammer may rupture pipes, damage valves and brazed plate heat exchangers.
Therefore, delaying the opening or closing of the valve can avoid this phenomenon and protect all equipment in the liquid line. Due to the difference in water quality in different places and the place where the plate heat exchanger is applied, it is important to pay attention to solution of water quality problems during usual maintenance. Therefore, pay attention to the following matters. Filtration of insoluble matter. Pay attention to regular maintenance and cleaning.
Avoid corrosion and scaling. Formation of scale is caused by the concentration, temperature, pH value and other factors that cause the crystallization and precipitation of mineral salts, and adhere to the surface of brazed plate heat exchanger.
The higher the temperature, concentration, and pH value, the greater the possibility of scale formation.
Stainless steel has high corrosion resistance to most chemicals, but is more sensitive to chloride ions, so its concentration must be limited to less than PPM.
Copper used in brazing process is more sensitive to acids and ammonia, so all pH values must be maintained between In addition, the pH should be controlled with changes in temperature and saturation to reduce corrosion and scaling. Ammonia medium is not suitable for brazed plate heat exchanger. For the plate heat exchanger cleaning methods , different applications use different methods.
For the brazed plate heat exchanger commonly used in refrigeration and air conditioners, if the dirt is formed due to poor water quality, chemical cleaning, backwashing or a combination of the two can be used. If the dirt is mainly sediment, regular on-site backwashing is the easiest and most effective method. If scaling occurs, it must be chemically treated. A weak acid cleaner can be used. At about twice the normal flow rate, clean the brazed plate heat exchanger by passing the pump in opposite direction through the heat exchanger.
After cleaning the system, rinse the brazed plate heat exchanger with water for at least 30 minutes. November 12, at pm. It's not a bad idea. Most cold it is under pressure and can't flow back. Gary R Gregory. November 19, at pm. I am designing a small house that will be very energy efficient for the southwest desert. Most of the design is completed however, I am having a hard time finding a particular part.
I want to use a backup heating system that has a good looking natural gas free standing stove that has a heat exchanger built in so I can transfer heat to another part of the house.
I find a lot of heater to air transfers that include a wood burning stove. The burning of wood in the desert southwest is not an option. Natural gas is available to me. Has anyone designed or know of a product that will accomplish this task? No big hurry at this time but. January 21, at pm. January 30, at pm. February 1, at pm. Thank you for the nice words, we appreciate it.
Expansion tanks are only needed with a pressurized system we are not. February 6, at pm. Thank you for the nice words We appreciate that here. Not really understanding your question, But I will take a shot at it, If your not getting enough heat from the heat exchanger it can be three things. Your heat exchanger is installed incorrectly. Your heat exchanger is too small, not enough plates for your application 3.
Your pump is not circulating enough water to exchange enough heat Hope this helps, Jeff. February 19, at pm. Great article and video. Need help sizing. I want to use exchanger on a takagi tankless water heater to do space heating as well as domestic hot water. I have a 1, sq ft house. The heater only goes to F so not sure what size to get since I am running at lower temperatures then specs say.
What size I need for 30,BTU of heat? February 21, at pm. I hear this a lot, from people who are trying to do this kind of thing, unfortunately, I have zero experience with this. Please reply back here if you find some quality information so we can all grow.
Thanks Jeff. March 12, at am. Do the plate and xchangers need to be installed above the water heater? Will haveing one in the crawl space elbow the water heater not work well? March 18, at pm. I am installing a 20 plate brazed heat exchanger for DHW. I have watched the video and answered a lot of my questions.
One remains, Is it best to install upright into the water supply to tank or can it be installed horizontally, or lay on top of tank? My water supply comes into the top of the tank horizontally about one foot above and then goes vertical into tank. I don't know how to support it! It seems like a lot of weight to be resting on the pipes as you show in the video, and if installed horizontally it would be heavy as well. I am not a plumber November 18, at pm.
Install as you see in the video, that is the best way. If you don't have room, do the best you can. It should work well. November 16, at am. So I installed the plate exchanger and now my pump does not get hot water to the second floor water to air exchanger.
Any thought thanks so micj. Sounds like you installed the plate exchanger in the wrong location. Make sure the plate is installed on the return side of the boiler only. Jeremy Ackerman. December 11, at am. This has been noticeably to my wife bc we always had darn near instant hot water at all stickers within 10 secs and now it seems to take almost a minute or 2 before the hot water reaches temp.
Once it gets hot.. Is this normal? Should I look at putting a one way valve prior to my cold water going into the plate exchanger? On the flip side my cold water is now almost like warm coming out of the spicket for a few seconds before chilling off. Thanks for the help. Your videos have been very helpful!! January 20, at pm. I have no idea where to start. Michael Stoecker. January 18, at pm. I totally understand hooking up a plate exchanger in a manner that results in cross flow.
The label on the exchanger shows the domestic cold on the right going in through the top and out the bottom and the hot from the boiler on the left going in the bottom and out the top. My question is: can I put the domestic cold on the left and the boiler hot on the right as long as I have them flowing opposite directions for cross flow?
Or is it designed to have domestic cold on right and hot supply on left? No, it doesn't matter which side you use for boiler or domestic hot water. Nathan Leinweber. November 25, at pm. So I see you recommend a 20 plate for a household of 3 or more but when looking at your offerings there are 20 plate units that have lower BTU ratings than others do you have a specific BTU rating that we should also be considering when making a purchase? Hollye Abner. January 9, at pm. We have had a heat exchanger heating our water year around for several years.
All of a sudden we barely have any hot water flow in the house. Cold water comes out strong, but when you turn it to hot the flow almost stops. In two-phase applications such as evaporators, the orientation of the heat exchanger becomes very important.
Although evaporators normally have the refrigerant inlet in the bottom, it is possible to evaporate downwards. This means that refrigerant will enter the evaporator in connection F1 and gas will leave the evaporator from connection F3.
In these circumstances, performance will be reduced. Ensure that no refrigerant liquid enters the compressor. This installation may also lead to control problems. For DX-evaporators, counter-current flow is the normal flow arrangement because it results in the highest MTD. For flooded evaporators, cocurrent flow is a common flow arrangement because a high inlet temperature difference is needed to initiate the evaporation process.
In cases of very high outlet port velocity, double outlet connections may be needed. This will decrease the velocity and pressure drop in the outlet port and thus increase the performance of the evaporators. In the case of parallel installed evaporators with one compressor, it is important to make sure that the pressure drops in the suction lines are the same. This is to minimize maldistribution and prevent poor performance. For evaporators, it is practical to measure the water temperature inside the heat exchanger.
The sensor connections are internally threaded where a temperature sensor can be attached. It is important here to ensure that the sensor is long enough to reach at least the middle of the port. As with evaporators, the orientation of the heat exchanger is also very important for condensers.
In a SWEP condenser, the refrigerant gas should be connected to the upper left connection, F1, and the condensate to the lower left connection, F3 see Figure 8. The secondary fluid circuit inlet should be connected to the lower right connection, F4, and the outlet to the upper right connection, F2. Counter-current flow is the normal flow arrangement, resulting in the highest MTD. Condensers can be tilted with some performance loss. The condenser is normally less sensitive to tilting compared with evaporators, for which the performance losses are significant.
I agree. Navigation Refrigeration handbook 1. Basic heat transfer 2. Compression cycle 3. Compressors 4. Expansion valves 5. Refrigerants 6. Evaporators 7. Condensers 8. Practical advice 8. Troubleshooting Systems Appendix Glossary.
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