CABERO AD PURISYS
Effective and economical disinfection of the air.
CABERO PRODUCTS ARE PRODUCED ACCORDING TO THE HACCP REGULATION
Since 2015 this has been confirmed by TÜV SÜD with the HACCP certificate for CABERO production.
UV-C radiation
UV-C radiation was discovered as early as 1801 by the German physicist Johann Wilhelm while researching the blackening of silver salts in sunlight.
86 years later, the English scientists Downes and Blunt discovered that the microorganisms are greatly reduced in sunlight. Experiments have shown that solar radiation below a wavelength of 320 nm has a germicidal effect.
Effect UV-C disinfection technology
Since short-wave UV-C radiation is already filtered out in the atmosphere, this effect is very small on the earth's surface and is therefore generated artificially.
UV-C rays are also known as ultraviolet radiation and cannot be detected by the human eye.
A major disadvantage of UV-C rays is that if you are exposed to it for a long time without protection, this can pose a dermatological and ophthalmological health risk.
One reason for this is the very high energy density in this spectrum.
The advantage, however, is that, depending on the radiation dose for microorganisms (germs) such as viruses (e.g. SARS-CoV-2 or COVID-19), bacteria (e.g. E. coli), mold, spores, fungi, prions, etc. destruction or neutralization is caused.
For example, the short-term irradiation attacks the protein coat, depending on the type of germ, and the genetic make-up (DNA and RNA) in the cell nucleus is disturbed or destroyed.
By destroying the DNA and RNA, the organisms remain sterile, which means that they are unable to function or reproduce. In simple terms, a sterile organism is an organism that cannot reproduce, spread, or cause disease.
Disinfection means the removal or killing of pathogenic microorganisms using physical or chemical methods. Sterilizing means removing living or dead microorganisms from a substrate., therefore, the terminology disinfection should be used when there is a material that is contaminated with germs and that is being treated with UV-C. In colloquial language, both are used with the same meaning.
With UV-C rays it is important to avoid the formation of ozone, which occurs at wavelengths below 242 nm. The extremely high energy input splits the oxygen molecule (O2) into two individual atoms. These combine with another oxygen molecule to form ozone (O3).
Ozone also has a disinfecting property, since most of the pollutants in the air are oxidized, but an ozone concentration of over 0.12 mg/m3 (BG ETEM information sheet no. 526) is considered by lawmakers at the workplace to be harmful to human health and also Animal classified.
A germ or pathogen is an infectious organic structure that can cause disease when it enters the body. Pathogens can be transmitted in different ways, depending on the way they enter the body: Skin contact, body fluids, airborne particles (including aerosols) and contact with a surface touched by an infected person. The most common types of pathogens are viruses, bacteria and fungi.
Empirical studies have shown that the efficiency of reducing germs depends on the duration and intensity of the radiation and the UV-C dose.
It has been found that microorganisms have varying resistance to UV-C radiation. If for example, E. coli bacteria are inactivated at a very low radiation dose of 1.5 mJ/cm2, much higher values must be applied to certain viruses.
Scientific studies show that the virus SARS-CoV-2 known as COVID-19 can also be inactivated with UV-C radiation.
Examples of pathogens with epidemic potential are the corona virus (SARS-CoV-2), West Nile virus, Ebola, E. coli, influenza and MERS.
Mortality as a measure of the number of sterile organisms can be expressed as a lethal dose (LD) at a certain concentration of the type of disinfection used, e.g. LD50 or LD90, indicating the amount of substance or radiation required to kill 50 % and 90 % of the germs to be tested, respectively. CABERO AD PURISYS evaporators are always designed for a specific radiation dose and therefore performance for a lethal dose of MINIMUM 90 % (LD90). Optionally, for example, for storage rooms with a significantly lower hazard potential, systems with a lethal dose of LD50 can also be offered.
Design
For the design of an appropriate radiation intensity and to be able to determine the lethal dose exactly, that should guarantee effective and reliable UV-C disinfection, the following external factors and physical conditions should be taken into account:
Air temperature, air humidity, internal air speed, residence time, air particles, lamp arrangement, particle distance, air space, radiation intensity, contamination factor lamp, surfaces of the device material.
CABERO AD PURISYS
The CABERO AD PURISYS evaporator, for which a patent application has been filed and which is under utility model protection, enables effective and low-cost disinfection of the room air during normal cooling operation. Additional ballasts or installations are therefore unnecessary.
Systems already available on the market, such as ballasts or the simple free placement of a simple UV-C lamp without effective control and monitoring together with the evaporator itself, cannot provide an effective radiation dose (LD90) for the disinfection of the room air, since in most cases the influencing factors described above are not taken into account or the basic aerodynamic requirements may be completely missing in a retrofit.
When developing CABERO AD PURISYS, the focus was on achieving a very high germination rate of up to 90 % (LD90). The following aspects are important here:
In general, the air velocities are not the same across the suction surface of heat exchangers. This is due to the use of axial fans, which do not generate a uniform air flow. In order to generate an even air flow over the suction surface, CABERO AD PURISYS uses an air straightener in the suction as well as in the outlet , which also functions as a deflector and prevents direct radiation to the people in the room.
The position and size of the air chamber of the disinfection system in the evaporator is important for high effectiveness and disinfection rate (mortality).
As a standard, in the processing room evaporator or cooler, UV-C emitters (lamps) are placed at the air inlet (L, in) of the lamellar heat exchanger. The UV-C radiation must reach both the actual heat exchanger and the condensate pan below the heat exchanger without restriction. In addition to the constant air speed, the dwell time of the germ in the air flow and the effective distance of the UV-C emitter to be observed also play an important role.
If there is an uneven and sometimes higher air speed in the fan chamber or emitter / air chamber, the applied radiation intensity (UV-C dose) is too low due to the shortened residence time of the germs and particles in the emitter / air chamber. In conclusion, it means that no conclusions about the sterilization rate (LD) and the necessary radiation strength to which different germs must be exposed to deactivate them can be made, neither theoretically nor practically.
Since a lamp means an additional source of energy, which must be considered in the cold load calculation, the emitter / air chamber is placed in the air flow in front of the heat exchanger. The reason for this is the temperature and humidity.
The lower the ambient temperature under which the UV-C emitter must work, the higher the radiation intensity that is required. A higher radiation intensity also means a higher energy requirement of the UV-C emitter (lamps). For applications in the processing room with a room temperature of 10 ° C, this electrical output can be 4 % to 6 % of the cooling capacity.
However, if the UV-C emitter is installed at the air outlet at a temperature of 4 ° C, the energy requirement and number of emitters increases dramatically and can amount to 12 % to 18 % energy requirement, compared to the cooling capacity.
Sterilization rate & air bypass
An important unique selling point for achieving a high sterilization rate (LD) of the air cooler or evaporator is the strict prevention of air bypasses in the device. In retrofit kits in particular, the escape of the conveyed air volume can only be prevented with great effort due to structural limitations through side panels, condensate pan and when connecting the UV-C retrofit kit and device.
The CABERO AD PURISYS evaporator directs the air flow through the entire device almost without a bypass. Special condensate trays and seals are used for this.
To ensure effective protection for the staff from virally triggered infections, an evaporator or air cooler must have an air bypass rate below 1 %.
Since the virus emitter (an infected person) remains in the work area and constantly releases viruses, a disinfection rate of at least 90 % can be achieved. With a bypass of the total air volume of only 3 % to 5 %, such protection is no longer realistic, even if the correct dwell time, air speed and radiation intensity were available.
An example illustrates this value. With a conveyed air volume of 4,500 m3 / h in a room with approx. 240 m3 room volume, with a bypass rate of 3 % to 5 % per hour.
Air volume between 135 m3 and 225 m3 untreated (no disinfection) returned to the work area through the device. A targeted disinfection rate of 90 % would therefore fall to a disinfection rate of 85 % to 87 % if this infected person remained in the room.
Applications & advantages
The application possibilities of the CABERO ADVANCED PURISYS evaporators are versatile, both in the meat industry, in fish processing companies, the fruit and vegetable processing industry but also in dairies and in general in companies with mainly cooled air circulation, the CABERO ADVANCED PURISYS evaporator can be used cost-effectively and efficiently.
The advantages at a glance:
- The formation of resistance from germs is completely stopped
- Greatly reduced use of chemicals (only for cleaning and longer cleaning intervals)
- Disinfected surfaces in the device (although cleaning is necessary)
- Targeted and controlled inactivation of certain germs through targeted UV-C radiation strength and emitter management
- Noticeable reduction in operating costs
- HACCP compliant manufacturing
- Odor reduction
- Controlled and improved product quality in terms of germ count
- Low acquisition costs compared to retrofit kits
- High sterilization rates
- Prevention of new infections in the work area
The use of germicidal UV-C radiation ensures safe and reliable sterilization of the room air. By individually calculating and designing the required radiation dose, users achieve efficient protection of their employees and products.
The exclusive use of ozone-free emitters (lamps) as well as the patent pending air / light diffuser (air rectifier) ensure environmentally friendly, chemical-free and safe disinfection of the room air.
Cleaning & maintenance
The simple and low-maintenance construction of the CABERO AD PURISYS evaporator or air cooler, enables the germicidal components of the system to be cleaned and serviced directly within normal cleaning and maintenance intervals.
All internal chambers of the device are accessible by means of foldable components such as Condensate trays and fan plate are freely accessible and offer optimal cleaning and maintenance access. No tools are required to unfold the components. These are opened and closed by means of a fastener with a PVC handle.
In addition, the UV-C lamps must be replaced every 12 to 24 months, depending on the model. A UV-C lamp used in the CABERO AD PURISYS evaporator has a service life of approx. 8,000 operating hours. Replacing the lamp at every annual HVAC service and maintenance is almost effortless. Replacement lamps can be conveniently obtained from the CABERO After-Sales Service (CASS).
CABERO Smart Control
A smart control with the new modular CABERO Smart Control (CSC) modules for AD PURISYS evaporators and air coolers enables optimal control and monitoring.
CSC controls:
- The switching cycles and operation of the germicidal lamps. Monitors their function and documents the operating hours and, in the event of failure, transmits a fault message to the building management system (BMS) and initiates a shutdown of the CABERO AD PURISYS device (if requested by the customer).
- Fault messages (fans) can be transmitted directly to the BMS via potential-free contacts, so that faults can be reacted to immediately. Another potential-free contact enables proactive warning messages such as the imminent reaching of the maximum operating hours of the lamps. This means that replacement can take place within a reasonable maintenance window.
- Air volume and air temperature are constantly monitored. If the air temperature falls below the designed temperature or the air volume is exceeded, an error message is output with the optional operation of the device being blocked. This means that the specified LD values can be achieved and the operator can be sure of the disinfection rate.
- The fully digital CSC control can optionally also be equipped with further BMS connectors. So, it is possible to use the evaporator e.g. to be monitored via Modbus, Modbus TCP / IP, ProfiNet or BACnet.