Parallel and counter- flow type heat exchangers

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These are two simplest forms of heat exchangers which are widely used in various fields. In parallel type heat exchangers, the two fluids enter at the same point inside the system and flow in the same direction. Here, the temperature difference between the two fluids decreases from inlet to outlet. In The counter flow type heat exchangers, the fluids enter the system from two opposite ends and flow in opposite directions. Here, the temperature difference between the two fluids remains almost constant throughout their flow path. In both these types of heat exchangers, the flow of fluids is along the same axis. The fluids are mostly passed through two or more concentric tubes which enable the heat transfer to occur between them. Parallel flow heat exchangers require lesser surface area than counter flow ones as the average temperature difference of fluids is greater in them. These are heat exchangers are comparatively simple in construction and comparatively lighter in weight.

Effectiveness-NTU method for analysis of heat exchangers

With heat exchangers there can be two types of problems. The first one is about the determination of the rate of heat transfer, temperatures of the fluid outlets and the pressure drops for an existing heat exchanger, so the heat transfer surface area and the dimension of the flow passage are available. The second problem is the determination of the dimensions of the heat exchanger to meet the specified pressure drop and heat transfer requirements.  If the pressure drop is not of concern, then in the case of the problems of the first kind calculation of the performance of a specific heat exchanger is required. And in case of the second types of problem designing heat exchangers for a previously specified performance is involved. If the outlet and the inlet temperatures of the cold and hot fluids and the total heat transfer coefficient are known or can be calculated easily in that case we can employ the LMTD method for solving the problem. In case the outlet temperatures are not known another alternative method known as the Effectiveness Number of transfer units or –NTU method is used.

Learning Center: how does a boiler heat exchanger work

Pillow Plate Heat Exchanger

Pillow Plate Heat Exchangers have unique designs, and are adapted for use mainly in the diary industry. Milk that is produced in diary industry is collected on huge stainless steel tanks. In such circumstances, the pillow plate heat exchanger is used to cool down the milk by connecting with the entire surface area of the huge bulk tanks containing milk. The pillow plate heat exchanger uses a unique technology where a thin metal sheet is welded to a much thicker metal sheet. The metal sheet is spot welded, and usually in the uniformly dotted pattern. After such welding, the part is put in high pressure, and the thin metal plate curves outward. The fluid that exchanges heat flows in these spaces which are formed due to such bulging. These bulges look like the formation of a pillow, and this exchanger is very economic and efficient for use in diary industry.

Water Ionizer – Essential for a Healthy Drink

Nothing could be more concerning to you than the water you and your family drink. Stay away from diseases by using water ionizer. A water ionizer filters all the contaminants from the water and makes it free from organic chemicals such as benzene, acrylamide; inorganic chemicals such as asbestos, mercury, and lead, also removes pesticides, chlorine and herbicides. The water ionizer also makes the water fit for your drinking by filtering out microbes such as Cryptosporidium, some bacteria from the Bacillus and Streptococcus species and also improves odor, color and taste of the water. Important ions needed for the proper functioning of your body organs are concentrated in the water you drink by the ionizers which protects you from diseases like osteoporosis and cerebrovascular malfunctions. Thus the ionizers ensure your water free from impurities and works as your body guard against diseases.

Notable Points on Hot Water Heat Exchanger

A hot water heat exchanger is equipped with a smooth coil system. The completion with temperature and control provided by the device is fabulous. The device has also got the capability of withstanding the pressure of large volume of water. The equipment is even able to recover fast if somehow damaged. An economic product, the hot water heat exchanger looks after reducing the energy bills as well. Different series of models are available for sufficing various types of needs regarding the heat transfer applications. There are several and simple instructions which direct the installation and accessing processes of the devices. These instructions are needed to be followed carefully. Doing things otherwise can damage the device. The instructions can be found on the packaging system, web pages and even consulting the specialists. Technology does a lot for the world, and it is clearly understandable through inventing modern solutions of heat transfer applications.