UTA - OCRAMCLIMA
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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.
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.
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 at 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 the selection of the 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 16890:2016 can 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 and PM10 up to ISO and PM1 |
| Compact Filter | M6 up to F9 | ISO and PM10 up to ISO and PM1 |
| Rigid Filter | M6, F7 and F9 | ISO and PM10 up to ISO and PM1 |
| 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 is 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 a 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 airflow (when injected steamed air mass and water steam in the airflow are correctly defined and adjusted). A 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.
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.
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
MU1
830
525
1500
2300
1,4
2,2
MU2
830
830
2600
4100
1,4
2,2
MU3
1135
830
3700
2800
1,4
2,2
MU4
1440
830
4800
7500
1,4
2,2
MU5
1440
1135
6800
10700
1,4
2,2
MU6
1440
1440
8900
14000
1,4
2,2
MU7
1745
1135
8400
13200
1,4
2,2
MU8
1745
1440
10900
17200
1,4
2,2
MU9
2050
1440
13000
20400
1,4
2,2
MU10
2050
1745
15900
25100
1,4
2,2
MU11
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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