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OcramClima

UTA - OCRAMCLIMA

The best choices to
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Casing strength (Maximum relative deflection [mm/m])

D1

Casing air leakage (Maximum leakage rate [l/(s/m²)])

L1/L1 (Model box)
L2/L2 (Real box)

Filter Bypass leakage(Maximum filter bypass leakage rate [%])

0,5 (F9)

Thermal transmittance (Thermal transmittance range [W/m². K])

T2 e T3

Thermal bridging factor

TB2, TB3 e TB4

Note: The information here presented complies with DIN EN 1886:2009-07

Frequência (Hz)

125

250

500

1000

2000

4000

8000

T3/TB4

17

21

25

23

22

28

33

T3/TB3

19

23

27

30

30

34

43

T2/TB2

21

23

25

32

35

44

50

Complementary information: Standard casing made of aluminium profile with 70mm wide and sandwich panels consisting of double galvanized sheet with rockwool insulation. The inner sheet is 0,8mm thick and outer panel is 1,0mm, painted in epoxy RAL 9006.

Aluzinc Panels

Epoxy painted inner and outer panels

Stainless steel panels

Different Thicknesses (by request)

COMPOSITION OF AIR HANDLING UNITS

Mixing sections are responsible for airflow regulation. These are made of aluminium blades, which movement is assured through a polypropylene gear, placed inside the aluminium structure as climate protection for a longer lifecycle. Leak-tightness is assured by rubber seals and mixing sections can be 2, 3 or 4 class, accordingly to EN 1751:2014. Mixing sections can operate manually or automatically, with a handler or an actuator respectively.

There can be several empty sections for access to allow maintenance operation and inspection for components.

All units are equipped with high-performance centrifugal fans of direct drive, class IE2 and IE5. State-of-the-art EC fans can be also applied. These are dynamically and statically balanced, accordingly to VDI 2060:2014 norm.
EC and PM fans can integrate electronic controls (including frequency inverter) if ordered by the client. The fan structure is made of galvanized steel. The rotor can be manufactured with aluminium alloy, galvanized steel or composite. Access to fans is granted through doors with inspection windows. Anti-vibration units are used to support fans (for AC fans) and prevent vibration transmission to AHU.

Sem Título-3
VERSIONS
DATA
EC Fan
IE4 e IE5
AC Fan
IE2 e IE3
PM Fan
IE4
Power Drawn by Fan
0,5 kW – 75 kW
Pressure Transducer
DC 0-10 V ; 0-3000 Pa

Coils are used to treat air temperature and can be water, direct expansion, steam and electric coils. Installed in rails to allow its removal, are easy to maintain and inspect. In the case of cooling coils, condensation pans installed are made of stainless steel.

Sem Título-4

Water coils

In water coils, the serpentine feed inside AHU is achieved through a hydraulic circuit, made of a group of circulating pumps. Fluid can be treated with an ethylene glycol solution of propylene glycol in case of freezing risk. Hydraulic connections are made with threaded ends (male thread) and pressure test for these coils is 16 bar.
In the cooling process, a droplet separator can be added if airflow velocity exceeds 2,2 m/s.

Direct Expansion Coils

Commonly known as DX Coils, these are based on a refrigeration circuit, where mainly R410 is used. Similar to water coils, connections are usually are made with threaded ends (male thread). The pressure test is 42 bar maximum, depending on the refrigeration gas used.

Steam Coils

Constructive features for steam coils are similar to water coils but these are built to increase airflow temperature. In this case, working fluid (water steam) operates with a temperature higher than 100ºC. Usually, steam coils have flanged connections.

Electric Coil

Electric Coils work based on Joule effect, where the production of heat is the result of a current flowing through a conductor.

Coils Frama Fins Tubes Drop eliminator
Space(mm) Material Material
Steam Galvanized Steel, stainless steel and aluminium alloy [2;12] Al, AlMg, AlPr*, Cu e CuSn Cu, CuSn, Stainless Steel e Fe
Direct Expansion Galvanized Steel, Al e stainless steel
Water
Electric Al Stainless steel

Although EN ISO 16890:2016 is the actual class for filter efficiency, EN 779:2012 is still being used for selection of filtering stage. High-efficiency HEPA filters use EN 1822:2019 norm.
Filter rails and structures can be made of galvanized steel. The frame/rails ensemble is efficient against leakage through a bypass. A comparison between classes EN 779:2012 and EN ISSO 16890:2016can be found in the table below, accordingly to Eurovent Recommendation 4/23.

FILTER OPTIONS EN 779:2012/EN 1822:2019 EN ISO 16890:2016
Pre-Filter G4 ISO Course
Bag Filter M5 up to F9 ISO ePM10 up to ISO ePM1
Compact Filter M6 up to F9 ISO ePM10 up to ISO ePM1
Rigid Filter M6, F7 and F9 ISO ePM10 up to ISO ePM1
Active carbon filter C4 and C7
HEPA filter E10, E11, H13 and H14

FILTER CONFIGURATION

Filters Depth Example Filters Depth Example
G4 (pre-filter) 50 M6; F7; F9 Rigid Filter 292
M5 up to M9 Bag Filter 360 C4; C7 Carbon Filter 292
M6 up to F9 Compact Filter 360 E10; E11, H13; H14 HEPA Filter 292

FILTER NUMBER

MODEL Dimensions (mm) MODEL Dimensions (mm)
592×592 287×592 592 287×592
MU01 01 00 MU14 08 06
MU02 01 00 MU15 12 03
MU03 01 01 MU16 16 04
MU04 02 00 MU17 20 00
MU05 02 02 MU18 20 05
MU06 04 00 MU19 10 07
MU07 02 03 MU20 20 09
MU08 04 02 MU21 18 00
MU09 06 00 MU22 24 06
MU10 06 03 MU23 24 10
MU11 09 00 MU24 30 05
MU12 08 00 MU25 30 11
MU13 08 04 MU26 36 06

A group of septa, placed in a parallel position to the airflow are made of non-inflammable rock wool, isolated with glass fibre. Both the length, height and thickness are variable and defined accordingly to the project. Septa structure, as well as the ensemble for galvanized steel, galvanized steel with epoxy RAL 9006, and Aluzinc or stainless steel, are installed in tracks, to allow easier maintenance and/or removal.

From a Psychrometric point, there is a specific increase in humidity relative to airflow and decrease in temperature of the dry bulb.

Adiabatic Humidifier. 

Adiabatic Humidifier is based on airflow through a wet surface (combs) which can be organic or inorganic. Humidifiers comprise a stainless steel condensation pan and frame. Installation on trails for easy maintenance and cleaning.

Steam Humidifiers

Steam humidifiers are based on a steam injection in the airflow. The water boiling point requires an energy source which can be an electrode, a burner or others. The biggest advantage of the system is the isothermal humidification of the air flow (when injected steamed air mass and water steam in the airflow are correctly defined and adjusted). Condensation pan in stainless steel is considered also for this system.  

Energy Recovery Systems used in AHU’s are divided into three groups: Plates Heat Recovery; Heat Wheel Recovery and Coils System Recovery.

Energy Recovery Systems used in AHU’s are divided into three groups: Recovery – Plates Heat Recovery; Regenerative – Heat Wheel Recovery and run-around coils.
Recovery:
Energy Recovery Systems are made of plates. Heating transfer between circulating air flows is achieved through plates made of aluminium. These plates can also be of a hygroscopic material to allow latent heat recovery.
There are cross-flow recovery systems and counter-current systems with high impermeability between air flows and high mechanical resistance to larger differential pressures. Condensation pan is installed in the air exhaustion side. There is additionally a bypass system option to allow the airflow to return the recovery system (used for free-cooling). This is possible through the installation of a mixing section in the recovery system or externally. 

Components Constructive Options
Non-hygroscopic plates Alumínium and aluminium with anticorrosion protection
Hygroscopic plates Poliethylene and Celulosis
Bypass system Modeling or on/off type
Mixing Section bypass instalation Inside or outsider the recovery system

Regenerative

In regenerative systems, mainly Heat Wheel Recovery, heat transfer occurs through a cyclic process of accumulation-release of heat by a rotating matrix. Heat wheels are essentially made of aluminium and can be condensation, hygroscopic and absorption/adsorption. Heat Wheel is driven by an electrical engine and the heat recovery can be controlled by a Speed-sensitive Variable Gear.

Options Observations Aplications
Condensation Sensitive Recovery Current application
Hygroscopic Sensitive and latent recovery
Adsorption Sensitive and latent recovery
Epoxy Sensitive Recovery Water and corrosive environments

Run-around coils

Recovery system made of heat exchangers air-gas or air-water. In the case f direct expansion coils or water coils, these are respectively placed in supply-air or exhaust-air side. Refrigerating fluid can be gas, water, ethylene glycol water solution or propylene glycol water solution. In water coils, near heat exchangers, the system is made of a hydraulic system with a circulation pump and expansion vase. Being a direct expansion system (unlike the previous) it comprises a refrigerator circuit. Connexions between coils and tubes are, usually made with threaded ends (male thread). 

COILS SYSTEM RECOVERY

Recuperation system composed by a cooling coil in the supply air and an another in the exhaust air, with same power.

Natural Gas Burner

Burners allow airflow heating through the indirect burn of gas (natural or propane). With efficiencies of at least 91%, potentially this system can heat between 11kW up to 900 kW, per unit. Tubes can be made of stainless steel or aluminized steel with a regulation type on/off or modelling. 

Options – Stainless Steel

Regulation – On/off Modelling

MODELS vs DIMENSIONS

AHUs – Models and Dimensions

MODEL UNIT

Dimensions (mm)
Width
Height
Air Flow (m3/h)
Minimum
Maximum
Coil Velocity (m/s)
Minimum
Maximum

830

525

1500

2300

1,4

2,2

830

830

2600

4100

1,4

2,2

1135

830

3700

2800

1,4

2,2

1440

830

4800

7500

1,4

2,2

1440

1135

6800

10700

1,4

2,2

1440

1440

8900

14000

1,4

2,2

1745

1135

8400

13200

1,4

2,2

1745

1440

10900

17200

1,4

2,2

2050

1440

13000

20400

1,4

2,2

2050

1745

15900

25100

1,4

2,2

2050

2050

18900

29800

1,4

2,2

MU12

2355

1440

15900

23600

1,4

2,2

MU13

2355

1745

18400

29000

1,4

2,2

MU14

2660

1745

21000

33000

1,4

2,2

MU15

2660

2050

24900

39100

1,4

2,2

MU16

2660

2355

28800

45300

1,4

2,2

MU17

2965

2355

32300

50700

1,4

2,2

MU18

2965

2660

36600

57600

1,4

2,2

MU19

3270

1745

26000

40900

1,4

2,2

MU20

3270

2660

40600

63800

1,4

2,2

MU21

3575

2050

33800

53200

1,4

2,2

MU22

3575

2660

44500

66900

1,4

2,2

MU23

3880

2660

44800

76100

1,4

2,2

MU24

3880

2965

54200

85200

1,4

2,2

MU25

3880

3270

60000

94300

1,4

2,2

MU26

3880

3275

65800

103400

1,4

2,2

Operating flow rates
Air volume flow (m3/h)

Air volume flow (m3/h)

CONFIGURATION EXAMPLES

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address each project with holistic,
custom-made solutions.
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