OPTIMIZATION OF INDUSTRIAL PROCESSES
BY FOGGING
Fogging is used for humidity control in industrial processes. Electronic equipment manufacturers, for example, use it to prevent static electricity. Due to the use of solvents, these facilities have low humidity levels. We regulate humidity between 55 and 65% RH. Fogging is also used to moisten paper in the paper industry.
MISTYL SYSTEM FOR ADIABATIC COOLING
ADIABATIC COOLING PROCESS
Adiabatic cooling is a process used in industry. It helps to save considerable amounts of electrical energy and increase refrigeration capacity during the hot season.
In addition, MISTYL systems evaporate water under high pressure. What’s more, they are easy to install on existing systems, such as evaporators or condensers.
Industrial plants and data centers also generate heat. This heat has to be cooled by expensive, energy-hungry air-conditioning systems.
The higher the temperature, the more it reduces machine performance. Finally, this process consumes a great deal of electricity, and the efficiency of compressors or water/air coolers remains lower than that of adiabatic cooling.
THE BENEFITS OF FOGGING USING ADIABATIC COOLING PROCESSES
AVERAGE ENERGY SAVINGS OF AROUND 25%.
Energy savings average around 25%. Less energy means less maintenance, less wear and tear, and above all a considerable reduction in costs.
It takes 100 calories to heat one gram of water from 0°C to 100°C. It takes 540 calories to convert the same gram of boiling water to the gaseous phase. With adiabatic cooling, this energy is directly subtracted from the ambient temperature, resulting in a temperature drop. A 7.4 kW MISTYL high-pressure fogging system consumes around 2,400 liters of water per hour. One liter of misting water produces a cooling capacity of around 2450 BTU. So a 7.4 kW (10 hp) system produces around 600,000 BTUs per hour. This achieves the potential of a 500-ton chiller.
Cooling capacity, of course, depends on climatic conditions. These include relative humidity and temperature. It is calculated using the famous Mollier H-X diagram, taking into account other parameters such as the difference between dry and wet bulb temperature and atmospheric pressure. In general, the higher the temperature, the lower the humidity and the higher the adiabatic cooling efficiency. Even in tropical regions, humidity falls during the day as the heat rises, justifying the use of a MISTYL-type cooling system.
INCREASED COOLING CAPACITY
Water diffusers produce a fog under high pressure, forming tiny droplets of water that immediately change to a gaseous state. The average droplet diameter is around 15 microns. This requires high-quality fog nozzles. The water must be as pure as possible. Depending on its quality, it must be treated by reverse osmosis or an equivalent process. This prevents deposits from forming on the equipment.
The diffuser jet is directed away from the air flow to achieve optimum evaporation dispersion. The diffusers are arranged on a grid and are activated or deactivated in stages, depending on the refrigeration rate required. Control can be stand-alone or connected to the central HVAC management system. This means the misting system can be perfectly integrated into existing installations.
The result is either considerable energy savings or an increase in cooling capacity, should existing resources prove limited.
COMBINATION OF ADIABATIC MIST COOLING AND HUMIDIFICATION PROCESSES
Adiabatic cooling systems can be perfectly combined with humidification of the production process.
Cooling the heat of the machines reduces the relative humidity and creates a risk of breakdowns. In this case, the nozzles are installed directly in the production room or in the air ducts. The mist is filtered to prevent condensation.
Adiabatic misting applications are designed for all heat-generating operations, including refineries, the chemical industry, plastics manufacturing, the automotive industry, gas turbine power plants and data centers.
