With heat recovery systems in industrial environments, the heat contained in the exhaust air is efficiently used to heat air or water. A very efficient use of this energy is the preheating of dryer supply air. The heat can be used continuously here. This warm exhaust air is also suitable for heating buildings. Depending on the local conditions, both air-to-air heat exchangers and air-to-water heat exchangers can be used for this purpose. The heated air, in turn, is fed into production and factory halls or other areas of the building. This type of supply air heating is particularly cost-efficient.
Such recovery systems also have a positive effect in terms of environmental compatibility. Waste heat from industry that is harmful to the climate is no longer released into the environment but remains in the cycle of the production process or building heating. The systems are also suitable for cooling rooms when outside temperatures are hot, for example.
Heat recovery from emission-containing process exhaust air has a lot of potential. This is because during many processes, especially in the industry, heat is lost via exhaust air. To ensure that this loss is not released into the environment unused and further boosts the greenhouse climate, the waste heat can be reused by means of rotary heat exchangers. Fresh air is heated in the system by the waste heat and fed into the building. Thus, most of the heat remains in the energy cycle.
Wessel heat recovery systems are also available with self-cleaning systems. This means that heat recovery systems, type Wessel, can also be used for dusty or aerosol-laden exhaust and waste gases, for which the use of residual heat was not suitable in the past. By saving energy – be it gas, oil, or electrical energy – these systems already make an important contribution to resource-saving production in many areas of application. At the same time, they play an essential role in reducing greenhouse gases such as CO2 and other harmful gases such as NOx and CO when fossil fuels are burnt.
The heat recovery systems from Wessel-Umwelttechnik, the WERO rotary heat exchangers, provide the supply air with heat from exhaust air containing dust, aerosols, and pollutants. Incidentally, the multi-stage and functionally expandable systems are also suitable as a preliminary stage for bio scrubbers. During the recovery process, the exhaust air saturation temperature is reduced before the purified exhaust air is released into the environment. This system combination also significantly reduces freshwater consumption in the scrubber.
Environmentally friendly heat recovery
Heat recovery systems from Wessel are highly efficient in terms of the heat that can be recovered. This is accompanied above all by a positive effect on the environment: less artificially generated heat enters the natural cycle and thus slows down the greenhouse effect.
Depending on the conditions on site and the respective requirements of the operation, the heat recovery systems from Wessel-Umwelttechnik can be modularly constructed and expanded. Such a system can therefore be adapted to the individual conditions.
The efficiency of heat recovery systems from Wessel-Umwelttechnik means savings through recovered heat. Up to 90 percent less primary energy is required, which has to be supplied from outside. This means that you heat the rooms and/or workshops of your company and save energy costs at the same time.
In a heat exchanger, including the WERO rotary heat exchanger from Wessel-Umwelttechnik, thermal energy is transferred on one side from warm exhaust air to cooler supply air. In a rotary heat exchanger, which belongs to the group of regenerators, exhaust and supply air flow alternately through the same rotatable, cylindrical structure. The exhaust air transfers its heat to the structure and thus cools down. The cooler incoming outside air is then heated by the warmed structure and directed inside the building or factory hall.
As a rule, metal, less often ceramics, is used as a material. WERO rotary heat exchangers are also made of metal. To prevent solid particles and aerosols from the exhaust air from entering the supply air, filters are placed in front of the heat wheel.
The recovery systems from Wessel-Umwelttechnik can be retrofitted and expanded as required. For example, a single-stage or multi-stage design is possible to increase efficiency. A pressure equalisation system, the WERO-LOGIC, can also be added to ensure a constant volume flow in the rotor. A sealing air system can be fitted to minimise leakage between supply and exhaust air. Furthermore, depending on the task, design and functionality adaptations can be carried out by Wessel-Umwelttechnik.
The areas of application for heat recovery are unlimited. Both in air-conditioning technology for residential buildings or offices and in the context of process air technology in the manufacturing industry, such recovery systems are an efficient and eco-friendly solution. The use of heat recovery systems has proven itself in the following areas, among others:
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