Application of nano coatings in HVAC industry | DamaTajhiz HVAC

Product name in English: HEX Nano Coat or Nano Sav coat

In this article, you will learn about nanotechnology and the application of nanocoatings in the HVAC industry and its effect on increasing heat transfer, reducing energy consumption, and reducing deposits.

What is Nanotechnology?

Nanotechnology is the new ability and achievement of scientists and engineers to manage the movement of atoms and interfere with how atoms are arranged and placed together with the aim of increasing the surface area and improving surface properties to achieve better efficiency.

One of the main and important methods to increase efficiency and heat exchange in heat exchangers is to increase the surface of heat exchange. Nanotechnology, as a new approach in the HVAC industry, and with the increase in heat levels, has a lot of potential to increase efficiency and reduce energy consumption in this equipment; in the following, we will mention some of these applications and the effects of using nanotechnology in heat exchangers. did

In general, today, the energy demand in the world is increasing rapidly, while energy resources are becoming scarcer day by day. In all HVAC systems, such as air-cooled compression chillers and centrifugal water-cooled chillers, screw, scroll, and absorption chillers, boilers, air handlers, heating packages, etc., they are one of the main consumers of electricity and gas, which are used to provide Heating and cooling systems are used in all types of residential, commercial and industrial buildings.

According to the latest research, approximately 40% of the total energy consumed worldwide is in the building sector. A total of 70% of the total energy consumed in the world is for the production of cooling and heating in various industries during the product production process, as well as providing air conditioning for all types of buildings. Residential, office, commercial, hospital, industrial, service, etc.

Reputable international organizations with research and studies to reduce energy consumption consider one of the best and most effective solutions to reduce energy consumption and prevent excessive energy use, to improve efficiency and increase efficiency in all types of HVAC equipment. Since the converter Heat exchangers are one of the most important and influential components in the construction of HVAC equipment, new technologies such as nanotechnology in the design and construction of these heat exchangers can be fundamental changes to increase efficiency. And the efficiency of these devices, and finally, their energy consumption is significantly reduced.

In the general definition of heat exchangers, which are basically one of the important internal parts in the production and construction of various heating and cooling devices in the HVAC industry, this equipment may be known by a specific name such as the condenser, evaporator, coil, boiler, stove, converter, etc. Still, in fact, the performance of these internal equipment is such that all of them are considered a type of heat exchanger. The better these converters and efforts to increase the efficiency of heat exchangers will ultimately lead to a significant reduction in energy consumption in the device.

Specialists and designers of heat exchangers in the design of this equipment in macro and micro dimensions have implemented all possible ways to increase the efficiency of these exchangers; among these methods can be the use of fins in macro and micro dimensions as well as the use of He pointed out special mechanisms to prevent the formation of sediments inside heat exchangers.

Factors that reduce efficiency in heat exchangers

The most important factors in reducing the efficiency of heat exchangers are:

1- Existence of boundary layer

The creation of a boundary layer on a microscopic scale is a constant problem in heat transfer in heat exchangers in such a way. The stickiness of fluid molecules on the internal surfaces of the exchanger, which is caused by the molecular bioelectricity of the fluid, prevents the direct heat exchange and transfer of the metal surface with the fluid. And it acts like an insulating layer, which causes a drop in efficiency in these converters.

2- Formation of sediment layer

Another factor in reducing heat exchange and efficiency in heat exchangers is the formation of sediment layers caused by impurities in the circulating fluid in heat exchangers. Lack of sensitivity and accuracy in controlling the degree of hardness and impurities in the fluid within the permissible limit. The formation of sediment layers on the inner surfaces of the pipes in the heat exchanger caused an increase in the pressure drop in the heat exchanger and a decrease in the system's efficiency. This issue will result in a lot of financial costs in the additional payment of electricity.

In addition to that, the increase in the level of deposits on the inner surfaces of the pipes in the heat exchangers, which has led to disruptions in the efficiency and optimal performance of the device and a sharp drop in efficiency, has caused very high costs and many and sometimes irreparable damages to The device requires a lot of time for basic repairs. For example, forming sediment with a thickness of every millimeter of the sediment layer will lose at least 10% energy consumption.

To increase the efficiency in heat exchangers, increasing the surface area by creating more fins and the geometry of the fins have always been and will be the attention of the designers of heat exchangers, but in the dimensions and geometry of the fins, almost in the micro and macro dimensions, the designers of the heat exchangers have reached the ultimate design and options. There is not much left, and a new method must be replaced.

The new suggestion is to use nanocoatings

Using nanotechnology, we create nanofin heat exchangers on the surface. By increasing the surface area and modifying the surface properties of the heat exchanger, nano fins create new achievements in increasing heat transfer for us; some of these new properties and achievements are:

• Increasing the heat transfer coefficient (h)
• Increasing the internal wall surface of heat exchangers
• Reducing the thickness of the boundary layer
• Molecular-scale turbulence in the boundary layer
• Preventing the formation of deposits on internal surfaces
• Impregnation of residual sediments on the surface
• Conversion of film condensation to droplets in condensers
• Increasing the heat transfer coefficient in heat exchangers
• Significant reduction in energy consumption

It should be noted that each of these stated achievements will bring many technical and economic advantages with the creation of nano-coating technology on the surfaces of heat exchangers, which can be discussed and analyzed in their own place.

Final word

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