The difference between double-walled and coiled storage tank

The hot water source is one of the types of equipment of the building's central heating system, which, together with the boiler, burner, and other related equipment, together form the engine room of the building. The hot water source is used to supply hot water for the central heating system of the building. In this article, the difference between the double-walled spa source and the coil source of the spa is discussed. Please stay with us in the rest of this article to examine and compare double-walled and coil spa sources.

Double-walled hot water source

As the name suggests, the double-walled source consists of two separate walls in the form of a horizontal cylinder. The cold water used in the building enters into the main source, which has a larger volume, and the hot water of the heating system, which is supplied from the boiler or boiler, flows into the peripheral or outer wall of the double-walled source. Double wall sources are usually produced and used from 300 liters to 1200 liter capacity and with working pressure up to 8 bar.

How the double wall source of the spa works

Sanitary cold water enters the main (internal) source through the inlet pipe located at the bottom of the double-wall source. At the same time, the hot water of the heating system enters the outer wall through the hot spring inlet pipe located above the source and flows between the inner and outer walls. The hot water outlet pipe is located above the source, and because it has enough time for heat exchange, it is placed in the opposite direction of the incoming cold water inlet pipe, then the hot water used flows into the building's sanitary spa piping network. The water of the heating system also loses its heat after the heat exchange and exits the source through the outlet pipe that is placed at the bottom of the double-walled source and is directed to the boiler or boiler of the engine room to be reheated. In general, as a result of the circulation of hot water in the heating system inside the outer wall (on the inner wall), sanitary and consumption water is heated. The image below shows the working schematic of the double window source.

Note: If the double-wall source is installed at a higher level than the engine room boiler, it is not necessary to use a circulator (linear) pump to circulate the water of the boiler in the outer wall of the double-wall sources, and the flow of heating water from the boiler to the outer wall of the double-wall source is by gravity. It is done by itself.

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The coiled source of hot water

There is only one wall in the coiled source or indirect water heater, inside which horizontal U-shaped or circular tubes (called the spa coil) are embedded. These pipes are usually copper and are used due to their small diameter and higher heat exchange capability compared to iron pipes. The hot water of the heating system flows inside the coil pipes and its heat is transferred through the wall of these pipes to the water stored in the wall of the coil source, and heats it for consumption.

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Coil sources with a capacity of 400 to 8000 liters are used based on the calculations and needs of each building, and the issue of correctly calculating and implementing the thickness of the body sheet based on the volume of the source and its working pressure is very important and vital. Usually, the thickness of the lens sheet on the sides of the coil sources in a capacity higher than 3000 liters is considered one size larger than the thickness of the cylindrical body sheet of the coil source.

How the coil source works

The way the coil source works is that hot water or steam from the building's central heating boiler flows inside the coil embedded in the coil source, and its thermal energy is transferred from the coil wall to the sanitary cold water inside the source and produces a sanitary spa.
It should be noted that in the horizontal coil source if the lowest part of the coil is above the collector level of the engine room hot water boiler, it is possible to supply hot water with a horizontal coiled source without using a hot water circulator pump. In the picture below, you can see the schematic of the coil source function.

Note: In order to flow the hot water of the heating system in the coil of coil sources, it is absolutely necessary to use a hot water circulator pump.

final word

On the site of Damatajhiz specialized collection, technical information of dozens of models of double-walled hot water sources and coil hot water sources from reputable brands with original warranties has been presented, so that you, dear ones, can enjoy the good feeling of optimal and smart shopping. To check and choose the double-wall source or hot spring coil source needed for your building, you can contact the heating equipment and motor room experts at Damatajhiz during office hours.

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