KLIMA 2 600 Active Chilled Beams
Index Subject Page Index 1 Introduction 2 General description 3-4 Product features 5-6 Dimensions 7 Performance data 8-11 Section example Guide specifications 13 1
Introduction The Barcol-Air chilled beam systems are designed to achieve a comfortable indoor climate with low energy consumption and a low ceiling void height. The systems provide cooling, heating, ventilation and humidity control with low noise and minimal maintenance. Figure 1: KLIMA Active Chilled Beam System Technology Barcol-Air active chilled beams integrate the primary air distribution function with the secondary air heat exchange using a proprietary air nozzle technology to induce secondary room air into the unit and through the heat exchanger before mixing with the primary air. The resulting mixture of primary air and induced secondary room air is then supplied to the room through the contoured diffusers which are designed to keep the air close to the ceiling using the Coanda effect. Barcol-Air's KLIMA 2 600 series active chilled beams units are designed with a nominal width of 600 mm to integrate with the ceiling grids of the more popular ceiling configurations. Standard unit lengths are nominally 1,0 mm to 3,000 mm in 0 mm increments but special lengths are also available to match with specific ceiling requirements. Primary Air Discharge Air Room air Discharge Air Figure 2: Operating Principle of the Active Chilled Beam 2
System Concept The principle of the active chilled beam system is to use terminal chilled water heat exchangers in the ceiling to offset the room sensible cooling loads or to provide sensible heating. The ventilation and humidity control requirements are taken care of by using separate primary conditioned air supplied by a central air handling unit. Active Chilled Beam System 7- C - + -19 C Figure 3: Active Chilled Beam System Due to the relatively high supply chilled water temperatures, about deg C, the heat exchangers operate dry, avoiding many of the maintenance and health concerns that are associated with other systems that use terminal heat exchangers such as fan coil units. The system provides large energy savings because the amount of air to be circulated around the building can be reduced to close to that required for ventilation and humidity control only, resulting in large reductions in air handling unit fan power and energy consumption. Further energy savings result from the use of high chilled water temperatures serving the heat exchangers. This can allow the water chiller to operate at higher water temperatures, giving the opportunity to improve chiller operating efficiency and energy consumption. 3
Air distribution The specific shape of the supply slot diffusers creates two opposing discharge air flows from the active chilled beam along the ceiling. The velocity of the supply air along the ceiling creates the Coanda-effect whereby velocity differences in the cool air stream press the air stream against the ceiling, thereby extending the air throw and preventing the cool air from dropping into the comfort zone prematurely. It is important, with such air patterns, that the ceiling is flat and free of any obstacles, especially light fixtures situated close to the slots, because these can disturb the Coanda-effect. Comfort zone 1.8m 1.0m 0.5m Facade-orientation Figure 4: KLIMA Air Distribution Orientation of the active chilled beam with regard to the facade has no influence on the operation. There are two common installation arrangements, perpendicular or parallel to the facade. The choice between perpendicular and parallel will be determined by: Aesthetics (fitting into the pattern of the ceiling). Level of flexibility to create offices within the floor plan. Number of active chilled beams required. Available distance for the air throw. The air must have the opportunity to mix with the room air before impinging on a wall or an opposing air stream from another chilled beam. Disturbances in the suspended ceiling which might influence air pattern, like lighting fixtures. Disturbances in the facade or floor, like radiators or floor convectors that could influence the air pattern. Figure 5: Perpendicular to Facade Figure 6: Parallel to Facade 4
Product Features High capacity with multi choice nozzles The KLIMA 600 series active chilled beams have a choice of 8 nozzle configurations designed to provide high induction rates for the secondary room air and thereby high cooling and heating capacities. This makes them suitable for application in a building s perimeter zones requiring higher cooling capacites as well as internal zones. Nozzles are factory installed and can be blanked if one side discharge is required. Figur 7: High Efficiency Air Nozzles Low Height: The KLIMA 600 series has a maximum height of 0 mm allowing the use of reduced height ceiling voids to maximize ceiling heights. Alternatively the building slab to slab height can be reduced allowing more floors in a given building height. Flexible Sizes Units are available with lengths between 00 mm and 00 mm to match with most ceiling configurations. Unit lengths can also be tailored to match exact installation requirement. Aesthetic Choices The KLIMA 600 series can be supplied with perforated return air diffusers or linear slot diffusers to match the aesthetic requirements of the building. Exposed metal surfaces are powder painted. The standard finish colour is RAL 9010 with % gloss. Other RAL colours can be supplied to match project requirements. Simple mounting: Units can be easily suspended from the concrete slab above using threaded rod or hanging wire support systems to match with metal panel, fiber board or plaster ceilings. Units can also be installed without ceilings. 5
Low noise: The efficiently shaped nozzles create maximum induction with low sound levels. Low maintenance: The KLIMA 600 series active chilled beam has no filter, fan, drain pan or any other moving parts and maintenance is limited to cleaning the exposed metal surfaces and cleaning any dust from the heat exchanger every 2 to 5 years depending on the cleanliness of the supply air. The heat exchanger can be easily accessed by dropping down the centre perforated diffuser which is equipped with a safety hanging wires, and then removing any dust with a vacuum cleaner. Controls: The active chilled beam can be supplied with constant air volume controllers for the primary air, water control valves with room control sensors as well as balancing and isolation valves and condensation sensors. Air Distribution Control (Optional) To allow selection of the air discharge pattern KLIMA 600 series units can be supplied with optional air discharge deflectors. These air deflectors can be independently adjusted to provide different air distribution patterns. Figure 7 : Air Distribution Control 6
Dimension KLIMA 2 600 Duct connection on the side 2 duct connections for models and 00 Duct connection on top 1. Dimensions in mm. 2. Air connectors can be provided on the short side of the plenum on request. 3. Intermediate lengths are available on request. Connection Diameters in mm Unit Size Chilled water Hot water 00- -00 15 Table1: Dimensional data KLIMA 600 Size A B C D D1 E F K Weight (kg) 4 00 1195 595 1 x ø3 1 x ø3 1090 3 0 10 1495 595 1 x ø3 1 x ø3 10 3 0 1795 595 1 x ø3 1 x ø3 90 3 0 25 595 2 x ø3 1 x ø1 90 3 0 00 95 595 2 x ø3 1 x ø198 90 3 0 54 7
Performance Data KLIMA 2 600 KLIMA 600-00 Cooling Troom minus T entering water temperature = 10 deg C Cooling Flow 1 Cooling Flow 2 Cooling Flow 3 Heating Flow 1 Heating Flow 2 Heating Flow 3 dba 10C flow l/s deg C l/s deg C l/s deg C l/s deg C l/s deg C l/s deg C 6 8 10 14 64 100 1 196 17 73 97 1 1 170 4 5 5 604 653 0 545 6 692 749 1.8 2.1 8 579 665 7 795 1.4 1.7 2.0 679 902 1079 13 8.1 1.9 859 11 15 1709 6.8 9.1 1.3 1 945 56 12 1706 80 5.6 7.5 9.0 10.2 1 00 A1 8 10 14 66 95 9 9 23 97 1 1 170 194 5 6 1 6 698 6 1 666 7 800 6 617 707 784 8 2.1 8 1021 16 89 17 10.2.2 15.4.7 1071 92 15 1768 8.5 1 11.8 1 1178 14 13 1795 1945 7.0 8.5 9.7 1 00 B1 15 21 73 105 1 6 17 23 1 2 2 5 1 4 5 604 6 7 7 613 692 759 817 2.1 549 6 7 806 868 1.6 9 1075 1198 15 10 11.1.8 1 15.6.7 1175 10 17 1772 9.4.1 93 1496 68 17 1949 7.7 9.0 10.0 1 00 C1 57 85 119 1 3 19 2 7 5 4 4 7 5 6 689 7 593 670 7 790 8 6 7 780 8 890 2.1 964 1092 01 97 13 1 1 1.5 21 12 11 17 9.7 11.0.1 1 13 15 73 07 19 8.0 9.1 10.0 1 00 E1 79 103 1 0 1 0 8 7 5 556 607 6 690 7 6 696 7 791 8 2.8 677 7 793 8 882 2.0 1067 16 53 13 19.8 1 15.9.7 13 16 16 83 1771 1 11.8.7 1 15 14 17 19 8.9 9.7 10.4 11.0 00 F1 70 93 119 1 0 0 1 5 2 5 608 6 689 723 6 697 7 790 8 2.8 680 7 793 8 880 2.0 1073 1173 59 13 11.8 15.9.7 13 15 1594 89 1774 11.8.7 1 1493 1753 19 8.9 9.7 10.4 11.1 00 G1 56 73 97 6 1 8 1 5 607 679 5 6 663 704 7 6 707 760 807 8 2.8 685 7 808 857 901 2.0 1103 13 53 15 11 1 1.4 17 1497 16 65 17 11.1 1.7 1 1 15 17 1910 9.2 9.9 10.4 1 11.4 00 H1 60 68 76 66 88 113 1 5 6 7 8 9 6 676 707 7 757 7 776 810 8 868 781 8 861 894 9 16 10 15 14 1.7 16 1567 1715 1777 11.8.5 1 1 13 1723 10 86 1955 9.7 1 11.3 Performance table notes 1) Air cooling capacities are based on Troom minus T primary air = 10 deg C. For other conditions multiply the table air cooling capacity by the required (Troom minus Tprimary air) divided by 10. Alternatively the air cooling capacity can be calculated from the formula: Air cooling capacity W = 13 x Airflow (l/s) x (Troom minus T primary air) 2) cooling capacities are based on Troom minus T entering water temperature = 10 deg C. For other conditions multiply the table water cooling capacity by the required (Troom minust entering water) divided by 10. 3) heating capacities are based on 4 pipe chilled beams with T room minus T entering water temperature = deg C. For other conditions multiply the table water heating capacity by the required (Troom minust entering water) divided by. 8
Performance Data KLIMA 2 600 KLIMA 600- Cooling Troom minus T entering water temperature = 10 deg C Cooling Flow 1 Cooling Flow 2 Cooling Flow 3 Heating Flow 1 Heating Flow 2 Heating Flow 3 dba 10C flow l/s deg C l/s deg C l/s deg C l/s deg C l/s deg C l/s deg C 10 13 19 68 103 145 195 21 1 1 194 2 7 5 706 802 881 949 670 809 919 1011 1088 2 2 2 2 2 7 860 977 1074 1156 2.1 1070 14 1701 19 8.5 11.3 1 15.4 17.0 14 2153 95 8.1 1.8 1 1490 1980 90 64 9.5 11.3.8 A1 13 19 45 68 96 9 6 23 1 194 2 7 3 3 7 8 9 1011 5.6 714 855 972 1072 1159 2.8 2 2 2 2 2 759 909 10 11 13 10 02 10.6.8 1.2 17.5 89 23 73 88 10.1.2 1 1.7 59 66 8.9 1.2 1 B1 75 102 1 8 21 21 3 1 0 8 7 687 787 872 945 1010 4.7 5.2 5.6 787 902 999 1083 11 2 2 2 2 2 8 959 10 11 14 94 89 07 1.4 53 2145 22 05 94 11.0.8 1 15.6.7 29 66 73 9.7 11.3.6 1 C1 55 77 102 1 3 23 0 0 1 5 2 7 8 896 956 1010 5.4 856 9 10 1096 11 2 2 2 2 2 910 1007 1091 15 11 17 95 21.1 1.3 17.4 19 28 90 60 1 1 1.5 2117 28 49 10.1 1.6 1 1 E1 56 78 101 6 155 1 5 607 679 7 8 882 9 998 10 5.6 6.3 9 1011 1082 11 00 2 2 2 2 2 989 1075 1149 15 75 82 1976 97 06 1 1 1.7 23 01 54 92.7 1 1 1.7 60 71 1.2 1 F1 60 68 76 69 93 119 1 45 5 6 7 8 9 811 885 949 1005 1054 6.3 9 1015 1088 11 09 2 2 2 2 2 988 1079 1156 84 91 1985 2104 10 1 1.7 21 21 13 63 97.8 15.9.7 25 76 65 77 11.3.3 1 G1 54 70 78 86 59 77 98 2 149 49 655 7 849 9 10 8 914 970 10 1065 5.4 6.1 6.3 974 10 11 19 21 4.7 2 2 2 2 2 10 1113 11 97 17 65 1976 74 23 1 1 1.5 17.2 02 21 01 1 1.4 23 97 88 11.4 1 1 H1 72 84 96 108 0 69 90 114 1 53 56 873 1019 14 10 1456 945 992 10 1070 1103 5.6 5.9 6.1 6.4 6.6 1083 11 15 65 4.7 2 2 2 2 2 11 09 59 14 14 19 21 14 1.3 17.0 23 71 95 04 02 1.7 60 54 75 83.2 1 1 1 Performance table notes 1) Air cooling capacities are based on Troom minus T primary air = 10 deg C. For other conditions multiply the table air cooling capacity by the required (Troom minus Tprimary air) divided by 10. Alternatively the air cooling capacity can be calculated from the formula: Air cooling capacity W = 13 x Airflow (l/s) x (Troom minus T primary air) 2) cooling capacities are based on Troom minus T entering water temperature = 10 deg C. For other conditions multiply the table water cooling capacity by the required (Troom minust entering water) divided by 10. 3) heating capacities are based on 4 pipe chilled beams with T room minus T entering water temperature = deg C. For other conditions multiply the table water heating capacity by the required (Troom minust entering water) divided by. 9
Performance Data KLIMA 2 600 KLIMA 600- Cooling Troom minus T entering water temperature = 10 deg C Cooling Flow 1 Cooling Flow 2 Cooling Flow 3 Heating Flow 1 Heating Flow 2 Heating Flow 3 dba 10C flow l/s deg C l/s deg C l/s deg C l/s deg C l/s deg C l/s deg C 14 70 105 1 196 21 170 2 7 5 4 8 1007 11 10 957 11 92 14 13 0. 0. 0. 0. 0..7.7.7.7.7 998 1193 17 18 2.0 11 19 23 08 8.7 1 1 17.4 59 30 81 8.8 11.8.0 05 74 49 8.1.9 1 A1 19 23 75 104 1 174 23 2 9 3 6 4 9 1097 17 19 5.4 1064 19 15 2.8 0. 0. 0. 0. 0..7.7.7.7.7 1110 10 1459 1596 1717 23 2199 11 76 08 1.6.0 84 78 14 08 11.0 1 15.2.8.2 96 66 10.1.2 1 15.4.7 B1 55 76 101 9 1 17 21 0 0 1 5 2 990 1117 13 18 5.6 14 69 14 13 00 0. 0. 0. 0. 0..7.7.7.7.7 1173 13 1454 1567 69 00 24 81 11 14 1 1 15.4.8.0 36.1 15.6 17.0.2 84 93 14 97 11.1.8 1 15.6.7 C1 65 73 99 7 0 9 5 619 704 788 10 11 54 13 11 1173 19 14 15 15 0. 0. 0. 0. 0..7.7.7.7.7 23 15 16 1591 84 77 22 88 95 78.4.7 1 77 36 70.6 1 1.9.0 92 03 91 1 1 1.5 E1 68 78 88 72 99 1 6 2 704 8 9 1067 1094 13 13 15 19 11 17 1710 0. 0. 0. 0. 0..7.7.7.7.7 96 1576 86 1783 97 98 64 13 1 1.0 08 79 14 1 15.2.3 17.3.2 99 97 57 88 95.7 1 15.9.7 F1 60 72 84 96 108 72 97 7 1 7 873 1019 14 10 1145 60 17 11 15 5.4 11 14 15 1721 0. 0. 0. 0. 0..7.7.7.7.7 17 1493 08 1707 1795 20 74 1 1.2 1.0 98 1 1.4 17.4.2 17 76 02 02.8 15.9.7 G1 70 82 94 106 1 53 73 95 1 1 49 849 995 11 86 14 17 70 19 14 18 4.7 5.4 13 13 15 1713 0. 0. 0. 0. 0..7.7.7.7.7 12 15 10 1703 1786 26 98 54 1 15.2.9 08 36 1 15.4.3 1 17.9 57 13 1 1.4 H1 90 110 1 1 170 64 90 119 153 55 60 55 1092 13 1577 96 14 1457 15 1575 5.2 5.5 6.1 6.2 13 1572 56 17 1789 0. 0. 0. 0. 0..7.7.7.7.7 15 17 01 66 11 66 00 15.9.7 17.4.0 79 75 94 15.2.9.3 97 99 63 10 1 1.2.8 Performance table notes 1) Air cooling capacities are based on Troom minus T primary air = 10 deg C. For other conditions multiply the table air cooling capacity by the required (Troom minus Tprimary air) divided by 10. Alternatively the air cooling capacity can be calculated from the formula: Air cooling capacity W = 13 x Airflow (l/s) x (Troom minus T primary air) 2) cooling capacities are based on Troom minus T entering water temperature = 10 deg C. For other conditions multiply the table water cooling capacity by the required (Troom minust entering water) divided by 10. 3) heating capacities are based on 4 pipe chilled beams with T room minus T entering water temperature = deg C. For other conditions multiply the table water heating capacity by the required (Troom minust entering water) divided by. 10
Performance Data KLIMA 2 600 KLIMA 600-00 Cooling Troom minus T entering water temperature = 10 deg C Cooling Flow 1 Cooling Flow 2 Cooling Flow 3 Heating Flow 1 Heating Flow 2 Heating Flow 3 dba 10C flow l/s deg C l/s deg C l/s deg C l/s deg C l/s deg C l/s deg C 00 17 65 98 1 5 19 6 7 3 8 9 9 11 97 16 15 5.2 6.1 1094 11 10 49 1777 4.7 0. 0. 0. 0. 0. 1 1 1 1 1 14 17 1789 19 2.8 53 63 87 1 17.2 19.6 21.6 99 55 54 4573 11.0.0.0 80 02 1 1.3.5.4 00 A1 75 102 1 172 19 23 1 2 4 3 5 1085 69 14 15 75 6.2 6.7 55 18 02 19 0. 0. 0. 0. 0. 1 1 1 1 1 11 1592 1786 1954 2101 21 88 14 1.2.5.5.2 07 1.7 19.0 21.0.7 82 4901.8 15.4 19.5 21.1 00 B1 55 73 100 1 7 4 497 2 667 7 1111 80 14 1545 53 6.1 6.6 85 10 45 1787 19 0. 0. 0. 0. 0. 1 1 1 1 1 13 05 1783 19 73 2.8 64 15.4 17.4 2.1 99 70 95 85 15.2 17.5 19.5 21.3.8 86 4556 4963 53.3.2 19.7 2 00 C1 66 74 82 59 79 103 9 159 607 704 801 898 995 19 13 1565 5.5 5.9 6.2 6.6 14 1704 10 1905 0. 0. 0. 0. 0. 1 1 1 1 1 1568 17 1963 66 82 31 76 17.2.8.2 2.6 90 87 45 87 1 1 19.6 21.1.6 67 4568 49 1.5.2 19.6.9 00 E1 74 86 98 110 73 99 9 1 45 49 7 898 10 19 13 86 14 15 17 6.1 6.6 6.9 17 1785 1904 10 0. 0. 0. 0. 0. 1 1 1 1 1 13 1787 19 65 2179 34 21 17.5 19.1.5 21.8.9 05 60 17.4 19.0.4 21.7.8 55 64 56 59.2.9.1 2 00 F1 75 90 105 0 1 70 95 4 157 45 49 55 910 1092 74 1456 13 1453 1566 63 1749 6.2 6.6 7.0 15 81 11 19 5.4 0. 0. 0. 0. 0. 1 1 1 1 1 56 23 1964 86 2194 17.7 19.3 2.0 2 45 95 96 92 17.5 19.1.5 21.7.9 78 60 87 73 53.2 1 19.1.2 2 00 G1 86 104 2 1 1 72 100 1 7 54 49 53 10 10 98 1917 13 16 1597 1701 1793 5.9 6.4 6.8 15 1707 1968 74 5.2 5.5 0. 0. 0. 0. 0. 1 1 1 1 1 70 03 21 49 13 21 91 45.2 19.5.6 21.7.6 74 4592 88.0 19.3.4 21.4.4 95 98 64 01 15.7 17.9.9 19.9 2 00 H1 0 145 170 195 0 69 95 5 0 49 53 56 63 53 1456 1759 25 69 15 1709 1779 6.1 6.5 6.8 7.3 1772 83 1977 57 4.7 5.5 0. 0. 0. 0. 0. 1 1 1 1 1 1921 21 34 80 00.9.1 21.1.0.8 10 71 60 19.0.2 2.1.9 06 49.7 19.7.5 21.3 Performance table notes 1) Air cooling capacities are based on Troom minus T primary air = 10 deg C. For other conditions multiply the table air cooling capacity by the required (Troom minus Tprimary air) divided by 10. Alternatively the air cooling capacity can be calculated from the formula: Air cooling capacity W = 13 x Airflow (l/s) x (Troom minus T primary air) 2) cooling capacities are based on Troom minus T entering water temperature = 10 deg C. For other conditions multiply the table water cooling capacity by the required (Troom minust entering water) divided by 10. 3) heating capacities are based on 4 pipe chilled beams with T room minus T entering water temperature = deg C. For other conditions multiply the table water heating capacity by the required (Troom minust entering water) divided by. 11
Selection example Specified data: Office (LxWxH) 7.2 (L) x 5.4 (W) x (H) m Occupants: 4 Minimum Ventilation 4 x 10 l/s = l/s Preferred size of chilled beams x 600 mm ( 2 units ) Summer room design condition ( Troom ) deg C with % Relative Humidity (dew point 1 deg C) Chilled temperature (Tw,in ) 15 deg C (Room Dew Point 13 deg C + 2 deg C) Summer supply air temperature (T1 ) deg C Summer sensible room cooling load 00 W or 13 W per chilled beam Winter room design condition ( Troom ) deg C with % Relative Humidity (dew point 9.0 deg C) Heating water temperature (Tw,in ) 45 deg C Winter supply air temperature (T1 ) deg C Winter heating requirement 00 W or 10 W per unit Calculation: The temperature differences required to make Determine required airflow for humidity control: the cooling selection are: Room latent load = 4 people x 55W = 0W ΔTAC = Troom - T1 = = deg C = x Airflow l/s x humidity g/kg ΔTWC = Troom - Tw,in = -15 = 9 deg C Room condition deg C % RH and humidity = 9. g/kg The temperature differences required to make Supply air condition deg C. Allow 1 deg C heat gain for the heating selection are: AHU motor and duct heat gain so required off coil temp = 11 ΔTAH = T1 - Troom = - = 0 deg C deg C and with 98% RH and humidity = 8.03 g/kg ΔTWH = Tw,in - Troom = 45 - = deg C Required primary airflow for humidity control = 0 / [ x(9. 8.03)] = 56 l/s or l/s per beam which is more than the l/s or l/s per beam required for ventilation Selection: Model: Width: 600 mm Length: mm Performance table: Page 9 Primary airflow: l/s per beam Nozzle: B1 Static air pressure in plenum: 102 Pa Cooling Performance Available cooling from primary air: 13 x x = 7 W per unit Required cooling from chilled water: 13 7 = 9 W per unit From page 9 select water cooling capacity: 10 W per unit at ΔT WC = 10 deg C with water flow = l/s With ΔTWC = 9 deg C water cooling equals: 10 x 9 deg C / 10 deg C = 956 W per unit and water flow is: l /s water pressure drop is: 2 K pa water temperature difference is: 956 W / ( 4.7 x l/s x 1000) = deg C And total cooling capacity is: 7W + 956W = 13W per unit x 2 units = W This satisfies the total sensible cooling requirement of 00 W for the room Heating Performance Available heating from primary air: 13 x x 0 = 0 W per unit Required heating from heating water: 10 0 = 10 W per unit From page 9 select water heating capacity 89 W per unit at ΔTWH = deg C with water flow = l/s So water heating capacity for ΔTWC = deg C 89 x deg C / deg C = 19 W per unit and water flow is: l /s water pressure drop is: K pa water temperature difference is: 19 W / ( 4.7 x l/s x 1000) = 1 deg C So total heating capacity is: 0W + 19W = 19 W x 2unit = 98 W per unit This satisfies the total sensible heating requirement of 00 W For non standard applications and/or selections, please contact our technical staff.
Guide Specifications Barcol-Air KLIMA 600 series active chilled beams shall be used to compensate for the external and internal heat loads of the building and shall maintain the thermal comfort in the room within the specified comfort and noise criteria. Functional description Primary air will be supplied by the fresh air handling unit to the chilled beam air plenum box. The primary air shall then pass through the induction nozzles into the mixing section to mix with the induced room air before being distributed into the room by two slot diffusers. Induction nozzles shall induce air from the room through the inlet air diffuser and then through the fin and tube cooling/heating heat exchanger before mixing with the primary air and being supplied to the room. The induction nozzles shall be factory installed to provide the required unit capacity with the specified primary airflow, air inlet pressure and noise level. Heat exchangers shall be 2-pipe type for cooling only or cooling/heating changeover systems or 4 pipe type for systems with separate cooling and heating circuits. The units shall incorporate two linear slot air supply diffusers and shall be designed so that the supply air is discharged horizontally under the ceiling using the Coanda effect to increase the air throw and to ensure the air mixing with the room air above the occupied zone. The centre diffuser shall be perforated to allow the room air to flow in to the heat exchanger and shall be easily removable to allow for any accumulated dust to be removed from the heat exchanger with a vacuum cleaner. The centre diffuser shall be provided with safety hanging wires. Construction of the chilled beam: The primary air plenum box shall be manufactured from galvanized sheet steel and shall have one or more circular air spigot connectors to ensure the inlet air velocity does not exceed m/s. The plenum should be internally insulated to prevent condensation if the primary supply air temperature is less than the surrounding air dew point temperature. The nozzle plate and chilled beam body shall be manufactured from galvanized steel with a minimum thickness of 0.8mm. The heat exchangers shall be made from seamless copper tubes with aluminum fins and shall have or 15 mm diameter water connections depending on unit's size and connections. The heat exchangers shall be suitable to operate at 15 bar working pressure and shall be factory pressure tested at bar pressure. The supply air diffuser and room air inlet diffuser shall be manufactured from galvanized steel with a minimum thickness of 1.0 mm and shall be finished with polyester powder paint to RAL9010 with % gloss or with an alternative finish to be specified. Dimensions Width: The chilled beam shall be 595 mm wide. Length: The units shall be 00, 10,, and 00 mm long or any intermediate length by special order. Height: The height of the chilled beam (including distribution plenum) shall not be more than 0mm. Installation The chilled beam shall have 7 mm diameter mounting holes for suspension by 6mm diameter threaded rod or suspension wires. 13