Air cooler / Evaporators
High performance flat ceiling air cooler for special applications and bakery processes
RDVN
HFC | Water | Brine
Ceiling air coolers with 1 to 5 fans in a particularly compact design and low height
Energetically optimized, proven AC fans, extremely pressure-stable characteristic curve
Low dehumidification of the goods due to large surfaces and highly efficient pipe system
Robust design for long-lasting and low-maintenance operation
Efficient defrosting system (block and tray) for reliable deep cooling operation
Easy cleanability according to hygienic requirements
External, easily accessible junction box
High performance ceiling air cooler for special applications
The RDVN is a high performance ceiling mounted air cooler specially designed for sensitive applications. With its flat design, combined with an evaporator block with 7 rows of tubes in the direction of the air, the RDVN achieves a high cooling capacity and, due to the use of smooth tube, low dehumidification at the same time. It is therefore particularly suitable for use with sensitive chilled goods, e.g. dough pieces in baking processes and as a fermentation interrupter.
With the powerful, pressure-stable 2-pole fans, the RDVN provides homogeneous air distribution and ensures a uniform room temperature with a high air flow rate in the cold room. The design incorporates a corrosion protection concept for durability as well as a long service life and withstands the highest hygiene requirements.
Hygiene standards based on the HACCP concept
Hygiene plays a particularly important role in the food industry. That is why we base the design features of our air coolers on the HACCP concept during development and offer maximum serviceability for easy cleaning.
Smooth surfaces, rounded corners and removable drip trays and side covers provide easy access and enable hygienic operation.
The RDVN´s range of application in bakery technology
Controlled fermentation delay or interruption
Proper rising of the dough is critical to the quality of the baked goods. To achieve the best results at the desired time, a controlled proofing delay or interruption is necessary, which is created by the controlled ambient temperature and moisture content.
The large heat exchanger surface of the RDVN ensures gentle cooling of the dough pieces.
Careful storage of dough pieces
In the production of baked goods, the right cooling conditions for the sensitive dough pieces are particularly important. To prevent the surface of the dough pieces from drying out too quickly, gentle storage is required to ensure optimum temperature, humidity and air circulation of the goods, which are usually stored on the oven racks.
Quality preservation by blast freezing
In blast freezing, the chilled product is cooled so quickly that it retains its quality without, for example, further fermentation processes.
Blast freezing is also used for already pre-baked or pre-cooked products. In this process, a core temperature of -7 °C is reached in the product as quickly as possible using a very low temperature with a high air volume.
Due to its high cooling capacity coupled with a high air output, the RDVN can also be used as a blast freezer.
Ideal temperatures for people and product
It is not only in summer that the high temperatures in a bakehouse cause problems for the employees and the quality of the baked goods. With the continuously adjustable EC fans, the bakery can ensure not only the right temperature in the room but also gentle airflow.
This ensures consistent quality of the baked goods and the well-being of the employees.
- Controlled fermentation delay or interruption
- Careful storage of dough pieces
- Quality preservation by blast freezing
- Ideal temperatures for people and product
Corrosion protection:
Various types of heat exchanger corrosion protection for use in aggressive environments
Aligned roller high-performance tube systems
with (optional) staggered fin spacing and no inner structure of the core tube (smooth)
Features
All product advantages at a glance
General
- Cooling capacity from 1.9 to 11.5 kW
- Temperature range: DLK: -40 – 40 °C
- Fin spacings 4.7 mm (alternating with 9.4 mm) and 7.5 mm
- Defrosting: electric, optional: Brine, hot gas
Operating pressure up to 25 bar
Easy assembly
- Compact dimensioning of the side spaces for smaller housing widths
- Easy access via side doors, removable
- Hinged drip pan for cleaning and servicing work
- Ceiling flush suspensions
- Pipe routing upwards possible
- Drain nozzle - vertical - R3/4 made of plastic (optinal aluminum or stainless steel)
- Horizontal drain connection made of aluminum or stainless steel (optional)
- Connections with threaded nipple, ventilation and drain valve (water or brine mode)
- Drain heating can easily be retrofitted/replaced
- External junction box for on-site wiring of the heating elements
Inspection & cleaning
- Double pan construction to avoid condensation
- Drip tray additionally powder coated
- Side doors can easily be removed
- Aligned tube pattern and fin spacings of up to 10 mm for easy cleaning
- Thick fins (0.3 mm) for extra stability during cleaning
- Removable drip tray for easy assembly and cleaning of the device
Energy efficiency
- Optimized aligned tube system with smooth fins ensures low pressure losses on the air side and high air flow
- Powerful 2-pole fans for pressure-stable operation
- Energy optimized AC fans
- Multi-fan units with intermediate plates for optimum flow through the heat exchanger
Corrosion protection
- Corrosion-resistant aluminium housing with scratchproof powder coating
- Corrosion protection for the heat exchanger and housing to withstand a range of environmental conditions
- Stainless steel housing (optional)
- All corrosion protection variants at a glance
Defrosting
- Heating rods in the coil for reliable defrosting, in aluminium housing to prevent vapours
- Uniform tray defrosting consisting of two U-shaped heating rods (optional)
- Defrost safety thermostat interrupts electric defrosting if the defrost control system (accessory) malfunctions
- Large heat exchanger surfaces remove less moisture from the air and thus reduce the need for defrosting
- Defrosting using brine circuit
- Insulated drip tray available as an option
Defrosting methods at a glance
Electric defrost
Electric defrosting is still the most common in commercial refrigeration.
Energy is required for the regularly repeating defrosting cycles with electric heating rods, which often contributes a considerable share of the operating costs. Therefore, with constantly rising energy costs, a particularly energy-optimised electric defrost is of great importance.
Brine defrost
Every refrigeration system transports heat out of the cold room to a point where this energy is usually given off as waste heat.
So what could be more obvious than to use this heat? For example, for thermobank defrosting. For this purpose, a separate brine circuit is installed in the evaporator block. During defrosting, warm glycol flows through it. Since the remaining equipment is relatively expensive, this method is particularly suitable for larger systems. With a glycol circuit, several air coolers can be defrosted (one after the other).
How can we help you?
We consult you competently and comprehensively!
Make a concrete enquiry now!
Tel.: +49 (0) 7156 / 2001-30
markus.mank@walterroller.de
