Ceiling air cooler / Evaporator
Dual side discharge ceiling air cooler for chilled and deep-freeze storages, logistics and order picking
DHNI/DHNIT
HFC | CO2 | Water | Brine
Low dehumidification of goods due to large surfaces and highly efficient tube system
Generous inspection openings for cleaning and hygienic operation
Pressure-stable AxiEco Diagonal EC fans hinged as standard
Mounting flush with ceiling for optimal hygiene and max. room height utilization
Maximum flexibility guaranteed
Thanks to its high flexibility, the new ceiling-mounted fan air cooler is the perfect unit for use in workspaces with long staff stays and in cold room and deep-freeze logistics. The DHNI utilizes an AxiEco Diagonal EC fan for energy efficient and pressure stable operation and can also be used with CO2 up to 80 bar operating pressure. The unit offers large side spaces via swiveling covers and reversible drip trays for structurally optimal piping of the condensate line.
The DHNI/DHNIT is used in these applications
Food Industry
Especially high demands are placed on refrigeration in the food industry.
Hygiene, energy efficiency and reliability are the top priorities.
But even when it comes to requirements for refrigerants, corrosion protection, material combinations, practical fin spacing, optimised tube and fin geometries, uniform air distribution or energy efficiency, Roller offers the optimised solution for every performance range and every application with its wide product range of evaporators and air coolers.
Storage & Logistics
The requirements for cooling in warehouse logistics could not be more diverse. The tasks are very specific:
In plus cold stores for fruit and vegetables, it is crucial that the sensitive chilled goods are stored in the right conditions and cooled gently. Dairy products are highly perishable and require a closed cold chain. Ripening chambers turn fruit varieties into products ready for sale.
In deep-freeze warehouses, uniform temperature distribution is important, reliable air coolers protect against thawing of the goods. In order-picking rooms, the impact on employees must be minimised. Roller offers a variety of individual solutions for all applications.
Commercial Refrigeration
The range of refrigeration technology for the retail trade is broad. Whether it's a butcher's shop, bakery, flower shop, petrol station, restaurant or supermarket - each sector has its own requirements to ensure optimum product quality.
One thing is always in the foreground: reliability in refrigeration technology when it comes to failure safety, hygiene or energy efficiency. Roller is the specialist for air coolers, evaporators and heat exchangers for the commercial sector.
- Food Industry
- Storage & Logistics
- Commercial Refrigeration
Product benefits
Your advantages at DHNI
AxiEco EC-fans
Pressure-stable AxiEco Diagonal EC fans hinged as standard
Air intake from below
for logistics, storage and freezer rooms
Air intake from above
Version for air intake from above for commissioning and working rooms (optional)
Dehumidification mode
by downstream electric heating rods (option)
Large inspection openings
with swivel-mounted fans and hinged drip trays
Strongly dimensioned fins
for cleaning work with high pressure cleaner
Flush ceiling mounting
for maximum hygiene and maximum room height utilisation
Scratchproof powder-coated finish
Fully aluminium housing, scratchproof powder-coated finish
Features
All product advantages at a glance
General
- Cooling capacity from 10 to 45 kW
- Temperature range: DHNI: 0 – 50 °C / DHNIT: -45 – 45 ̊C
- Fin spacings 4 / 7 mm / (Optional 12 mm at CO2)
- Defrosting: electric, optional: Brine, hot gas
- Heat exchanger coil for an operating pressure of 25 bar/ 80 bar with CO2
- Very quiet AxiEco Diagonal EC-fans
Heat exchanger
- Proven aligned Roller pipe system with large surfaces
- CO2 evaporator block with PS 80 bar
- Thick fins (0.3 mm) for extra stability
Energy efficiency
- AxiEco EC fans with maximum energy efficiency for a high system efficiency
- Adjustment of the air volume flow according to the cooling load via external controller (0 - 10 V)
- Multi-fan units with intermediate plates (fan chambers) for optimum flow through the heat exchanger
- Optimised, aligned pipe system with smooth fins ensures low air-side pressure drop and high air flow rate
Inspection and cleaning
- Removable hinged drip pan for cleaning and servicing work
- Side doors can easily be swiveled
- Design geared to the HACCP concept (easy access to the entire unit for cleaning and maintenance work)
- Heat exchanger can be cleaned from three sides
Easy assembly
- Generously sized spaces at the sides of the unit for easy access via side doors, removable
- Drip tray for cleaning and servicing work hinged on both sides and easily removable
- Connections with threaded nipple, ventilation and drain valve (water or brine mode)
- Both evaporator coils are brought together on a shared inlet and outlet tube
- Ceiling flush stainless steel suspension
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 ceiling mounting integrated into the unit
- All corrosion protection variants at a glance
Defrosting
- Large heat exchanger surfaces remove less moisture from the air and thus reduce the need for defrosting
- Defrost safety thermostat interrupts electric defrosting if the defrost control system (accessory) malfunctions
- Defrosting by Brine, hot gas and electric heating
Accessories
Find suitable accessories for the DHNI
EVD-ice:
Electronic e-valve and superheat controller for efficient, safe operation and quick commissioning (optional)
Corrosion protection
Various types of heat exchanger corrosion protection for use in aggressive environments
Defrost safety thermostat
Switch contact opens at +25 °C and closes at +6 °C
Heating rods:
zur Blockabtauung (tR >0°C) (IP66) mit einfacher Nachrüstmöglichkeit
Technical data
All important technical data at a glance
| Product name | DHNI | DHNIT |
| Capacity range | 10 - 45 kW | 10 - 45 kW |
| Temperature range | 0 °C to 50°C | -40 °C to 50°C |
| Defrost heater | Without | E-heating |
| Tubes | Internally grooved | Internally grooved |
| Tube system | Aligned | Aligned |
| Number of fans | 1 - 3 | 1 - 3 |
| Fan type | EC / pressing / IP 55 | EC / pressing / IP 55 |
| Fan size | 450 mm | 450 mm |
| Fin spacing | 4 / 7 mm / 12 mm at CO2 | 4 / 7 mm / 12 mm at CO2 |
| Energy efficiency class | A+ to B | A+ to B |
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
