Polaris-I-60. active chilled beam. the future of space conditioning
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- Rudolph Fox
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1 the future of space conditioning Polaris-I-60 active chilled beam Function Cooling and supply air with two-way air distribution Available with heating and integrated controls Application Offices, hotels, hospitals, schools, banks, etc. Installation Recessed in a suspended ceiling Suspended from the soffit Capacity Up to tk Features High capacity in a shallow product profile Very low noise level No adjustment required on the air side As standard with hood to prevent noise transfer Available with Drypac TM condensation protection
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3 Description Polaris-I-60 Active chilled beam The Frenger Polaris-I-60 unit is an active chilled beam for integration into a suspended ceiling system. It uses a supply of fresh ventilation air to induce warm room air to the unit s vertically mounted cooling batteries. This warmer room air is cooled as it passes through the finned tube cooling batteries, which comprises of aluminium fins with copper channels through which cool water passes. The heat of the room is taken in through the aluminium fins, and transferred into the water circuit through the copper tube and on to a central chiller. The unit is able to induce and condition 4-5 times as much room air as fresh air supplied. Conditioned air is then quietly reintroduced into the room, entraining to the ceiling rather than being dumped directly below the beam, thanks to patented nozzle technology and air chamber design that produces a Coanda effect within the unit. Polaris I single air connection (shown here with slotted underplate) Polaris I double air connection (shown here with perforated underplate) Benefits of active chilled beams units can deliver cooling, heating, fresh air and lighting no moving parts equates to reduced maintenance costs capital costs now comparable with more traditional systems improved efficiencies translate to lower running costs can be installed in shallow ceiling voids (240mm) units can deliver cooling capacities in excess of 200W/m 2 Frenger s unique benefits all recirculated air is induced through the removable underplate and consequently there is no need for a return air path via the ceiling void advanced technology delivers induction ratios of 5:1, enabling effective cooling at supply air rates as low as 1litre/s/m 2 patented nozzle design results in whisper-quiet operation unique discharge air chamber design creates a Coanda effect within the unit, with air entraining to the ceiling for improved comfort levels units with Drypac TM coil coating can deliver cooling capacities in excess of 300 W/m 2 3
4 Efficient and quiet space conditioning The vertical batteries that characterise Frenger s range of active chilled beams enables the units to deliver unrivalled levels of cooling capacity with a given air volume. The units are so efficient that they can provide cooling in excess of 100 w/m 2 with fresh air supply of as little as 1 litre/s/m 2. Units are designed to integrate into suspended ceiling systems. They fit easily into the most common ceiling designs and have removable faceplates that can be perforated to match perforated metal ceilings where required. This removable faceplate provides access to the factory-fitted motorised valve, drain cocks and controls. Systems are also designed to ensure very low noise levels. They incorporate a patented nozzle design which delivers cool air to the room very quietly, and makes them suitable for discreet installation in hotels, offices, hospitals, schools and banks. Air delivery can be acurately controlled so that air velocities do not exceed 0.25 m/s, ensuring compliance with ISO Beams can be supplied with factory fitted motorised control valves to reduce on-site costs, and CIBSE LG3 compliant integrated lighting systems. Operation An active chilled beam is essentially a water-driven, ceiling-mounted induction unit. It uses a supply of fresh ventilation air to draw warm room air to the unit s cooling battery. The Frenger beam is able to induce and condition 4-5 times as much room air as fresh air supplied. Conditioned air is then quietly reintroduced into the room, entraining to the ceiling rather than being dumped directly below the beam, thanks to patented nozzle and air chamber design that produce a Coanda effect. The nozzle technology also allows the Company to determine and factory-set the airflow dispersion characteristics of each unit. Beams can deliver a cooling capacity in excess of 200W/m 2. Composition and manufacture Air is cooled as it passes through a lamella battery, which comprises aluminium fins with copper channels through which water passes. The heat of the room is taken in through the aluminium lamellae, and transferred into the water circuit through the copper tube and on to a central chiller. Active chilled beams have no moving parts, and as such maintenance costs are minimal. 4
5 Access for Cleaning and Maintenance. The requirement that all parts on the beam can be easily cleaned, has been met by using a removeable perforated underplate. All items requiring cleaning or maintenance are accessible from underneath. Polaris-I-60 with single air connection also has a detachable cleaning and adjustment hatch on the distribution air channel. Unscrewing the hatch provides access both for cleaning the supply air channel system and the beam s own side channels from the inside. Polaris-I-60 with double air connection has a detachable cleaning hatch in the end of the product. The vertical batteries are accessible from three sides (unlike products with horizontal batteries, which are impossible to clean from above) and can in this way be cleaned out completely; the same applies to the Coanda nozzles, which can easily be cleaned from underneath. In this way, thorough cleaning of the product can be carried out from underneath. Where units are fitted with control valves, actuaters or condensation sensors, these are also totally accessible via removable underplate. Detachable access hatch When removed for access, the underplate is retained back to the unit using braided wire security cords. In this way the unit can be accessed safely and without damage to the product. 5
6 Regula Polaris-I-60 with built-in regulation and fast coupling Climate Units Cooling, heating, air supply and control The large capacity of the product enables it to satisfy the room s cooling, air supply and heating needs using a minimum area of the valuable ceiling space. In a normal-sized office, a 1.2m long unit is often enough! Because the product is delivered with a factory-installed air flow at a selected air pressure, mounting is quick and easy. If required, the air flow can later be increased by unplugging the nozzles or decreased by plugging off more nozzles. Polaris-I-60 can also be supplied with built-in valves and actuators for cooling and heating, and also with condensation sensors. If desired the actuator s cables can be connected to an interconnection card on the products end gable with a fast coupling adapted to the cable for the Regula controller.the interconnection card has contacts for coupling together control signals and/or power supply between the chilled beams. Up to 12 chilled beams can be controlled by each central control. The construction of the active beam has provision for integrated lighting. This requires room air to be circulated from the top side of the beam, which will be supplied open. Polaris-I-60 with integrated lighting therefore demands openings in the suspended ceiling (or the introduction of perforated metal ceiling tiles), and should be mounted at a minimum distance from the structural soffit (see Fig 3, page 9). 6
7 Air Distribution Frenger s range of active chilled beams have been specifically designed to deliver air into the space in a controlled and predictable manner. All beams create a Coanda effect in the unit which encourages the supplied air to entrain to the ceiling or soffit. Furthermore, units can be manufactured with varying throw characteristics (short, medium and long) and even with different air delivery characteristics from either side of the unit. Air distribution and comfort levels are determined by many factors; supply air temperature, air volume, air pressure, air direction and entrainment and beam spacing. Extensive laboratory tests have been undertaken to develop a library of imperical data presented in the form of scatter diagrams, which enables the designer to select the most appropriate product configuration for any given condition. 7
8 Variants Size: Polaris-I-60 is 592mm wide (width 60) and 230mm high. Lengths: Polaris-I-60 is available in lengths from 1.2m to 3.6m in 0.3m increments. Water Connection: Available in o.d. 15mm or o.d. 22mm copper. Both horizontal and vertical connections are available as standard. Heating tubes in o.d. 15mm; copper to Swedish standard SS5015/04. Air Connection: Polaris-I-60 comes with a single or double air connection. The single air connection is 125mm and both horizontal and vertical connections are available as standard. Polaris-I-60 with double air connection uses a double 100mm horizontal connection. Design: Polaris-I-60 is available with perforated underplates, which offer different aesthetics. It is perforated as standard, but other finishes are available such as traverse slots. Hood to prevent transfer: This is available as standard on the product to prevent spreading of noise to adjacent rooms, and also where there is a requirement to prevent the room air from mixing with the air in the ceiling void. There is no hood to prevent transfer on the Polaris-I-60 with integrated lighting. Surface finish: Polaris-I-60 is produced as standard in finish-lacquered plate using colour NCS 0502-Y, gloss value 30 +/- 5%, equivalent to RAL Additional functions Heating: Polaris-I-60 can be delivered with a heating function. An extra tube in the battery heats the room. Drypac TM : Anti-condensation treated cooling battery which allows the chilled beam to operate below dew point. See also separate brochure. Lighting: Avaialble in several versions. Please contact Frenger Systems for further information. Air flow control: The product has a factory-installed pressure drop value, so that on-site adjustment is not necessary. This presupposes that the primary air ductwork in the building has a relatively low pressure drop compared with the pressure drop across the product. In cases where a damper is still needed, Frenger Systems silent dampers with metering socket can be ordered. Only available in 100mm diameter. Room control: The room temperature can be controlled with our electronic control equipment, Regula. Room control with fast coupling: Polaris-I-60 can be ordered with built-in valves with actuator connected to an interconnection card with fast coupling for central control and for coupling together control signals and/or power supply between the chilled beam units. See figure on page 6. 8
9 Installation. Polaris-I-60 is designed to be integrated into a standard 24mm wide exposed grid ceiling system installed on a 600mm module. It is important the the ceiling grid main runners are positioned either side of the chilled beam and parallel to it s length, and that the bayonets on the cross noggins are bent back to accept the unit. The chilled beam itself is supported directly from the structural soffit using threaded rod suspension hangers. Two sets of hangers are used to support beam lengths up to 2.5m, and three sets for beams above this length. Extra hanger where beam is longer than 2.5m 300 = = 300 9
10 Dimensioning Cooling effect supplied in ventilation air (W) 1. Start by calculating the requisite cooling effect needing to be delivered to the room to give a specific temperature. 2. Calculate the possible cooling effect delivered to the room through the ventilation air. 3. The residual cooling effect to be delivered by Polaris I. Quantity of air Temp. difference of Room air - Supply air ( o C) q (l/s) Formula for air cooling effect: P (W)=m x cp x t m = mass flow kg/s cp = specific heat capacity Kws/kg, C Usually m x cp q x 1.2 Where q = air flow (l/s) Effect diagram for different pressures (see also quick selection charts for 60 Pa on the following pages) Follow these instruction for reading off the effect from the diagram. Product length minus 0.3m, to obtain active length. Divide the air flow by the active length, enter the results on the lower axis of the diagram. Follow the flow line up to the right pressure, then read off the effect. Multiply the effect read-off by t (room temp. the average water temperature) Then multiply by the active length. Example: How large an effect has a 1.8m long Polaris-I-60 with 25 l/s and 60 Pa pressure. Temperature difference room-average water = 9 o C Answer:1.8m-0.3m = 1.56m = active length 25 l/s 1.5m = 16.7 l/s per m. Read-off 52 W/m and o C. Cooling effect = 52 x 9 o C x 1.5m = 702W. 10
11 Cooling effect, Polaris-I-60 Drypac, condensation protection If Polaris-I-60 is chosen with batteries protected with Drypac coil coating then the supply water temperature can be selected 4 C lower than with a standard battery. This will permit 24-hour operation 4 C below dew point with no risk of condensation. For more detailed information refer to the relevant Frenger data sheet. Where Drypac TM is used to offer additional condensation protection, but the unit is operating above dew point (dry) then the following capacities need to be reduced by 17%. Sound absorption is equivalent to 10m² Sabine. Frenger Systems documents its effects using the V-method. 0 l/s and unit air pressure 60 Pa. Length, m Cooling effect per unit Room temp. - Average water temp. ( o C) Noise level db(a) x <25 < <25 < <25 < <25 < <25 < <25 < <25 <25 If Drypac TM is used reduce the cooling effect by 17% when operating above dew point (dry). 20 l/s [72 m 3 /h] and unit air pressure 60 Pa. Length, m Cooling effect per unit Room temp. - Average water temp. ( o C) < < < < < < <25 If Drypac TM is used reduce the cooling effect by 17% when operating above dew point (dry). Noise level db(a) 2 x 100 <25 <25 <25 <25 <25 <25 <25 11
12 Cooling effect, Polaris-I l/s [108 m 3 /h] and unit air pressure 60 Pa. Length, m Cooling effect per unit Room temp. - Average water temp. ( o C) Noise level db(a) x < < < < < < <25 If Drypac TM is used reduce the cooling effect by 17% when operating above dew point (dry). 40 l/s [144 m 3 /h] and unit air pressure 60 Pa. Length, m Cooling effect per unit Room temp. - Average water temp. ( o C) Noise level db(a) x If Drypac TM is used reduce the cooling effect by 17% when operating above dew point (dry). 12
13 Cooling effect, Polaris-I l/s [180 m 3 /h] and unit air pressure 60 Pa. Length, m Cooling effect per unit Room temp. - Average water temp. ( o C) Noise level db(a)* x If Drypac TM is used reduce the cooling effect by 17% when operating above dew point (dry). * The double air connection is always used for air flows above 40 l/s. 60 l/s [216 m 3 /h] and unit air pressure 60 Pa. Length, m Cooling effect per unit Room temp. - Average water temp. ( o C) Noise level db(a)* x If Drypac TM is used reduce the cooling effect by 17% when operating above dew point (dry). * The double air connection is always used for air flows above 40 l/s. 13
14 Cooling effect, Polaris-I l/s [252 m 3 /h] and unit air pressure 60 Pa. Length, m Cooling effect per unit Room temp. - Average water temp. ( o C) Noise level db(a)* x If Drypac TM is used reduce the cooling effect by 17% when operating above dew point (dry). * The double air connection is always used for air flows above 40 l/s. Heating effect, Polaris-I-60 The heating effect is half the cooling effect for the same temperature difference Heating effect = Cooling effect x t heat 2x t cooling Example: What will the heat effect be in a 1.8m long Polaris-I-60 with 30 o C temperature difference between average water temperature and room temperature, 60 Pa channel pressure and air quantity 25 l/s. Answer: A 1.8m long Polaris-I-60 gives 780W cooling effect at t 10 o C and 60 Pa channel pressure. The heating effect will then be 780 x 30 / (2x10) 1170 W. ~ 14
15 Coupling & connection Polaris-I-60 is supplied in lengths from 1.2m to 3.6m inclusive in 0.3m increments. The connection dimension on the waterside is OD. 15mm or OD 22mm and on the air side 125mm single or 100mm double. Step 1. State the position of the air connection. Air Connection. 125 Polaris-I-60 is available with a large number of coupling options. Step 2. State the position of the pipe connection. Water Connection Air Connection. 100 Water Connection Example See below for examples of standard coupling options. Type A4 therefore has horizontal air connection to the end gable and vertical pipes on the opposite end of the beam. 15
16 Width & height, mm Length, m 1.2, , , , , , , , - 3.6m Dimensions, mm 16
17 Weight and water volume Weight, kg/m Water content, l/m Working pressures Maximum working pressure, Bar (g) 6.0 Maximum test pressure, Bar (g) 10.0 Classification category Pressure Equipment Diretive 97/23/EC SEP 17
18 Scatter diagrams & cast lengths, Polaris-I-60 Polaris-I-60 and other induction beams use the pressure of the supply air to create room air circulation through the cooling battery. This enables a high cooling effect, but also creates large air movements which often produces long cast lengths. This is why an outwardly angled spread of air, which considerably reduces the cast length and air speed compared to conventional straight nozzle technology, comes as standard with Polaris-I-60. Depending on the room conditions, Polaris-I-60 can also be selected with a long distribution profile or an extra short distribution profile. See below for an example of how the nozzle angle affects cast length and air speed. 2.1m long product. 18
19 Standard distribution profile Height to underside of beam: 2600mm. Air flow: 22 l/s per active metre. Pressure in air channel: 60 Pa. t room - average water temperature: 9.0 o C. t room - Supply air temperature: 5.0 o C. Air speeds with standard distribution profile (nozzle angle 16 o ). Cast length (0.2 m/s) with standard distribution profile (nozzle angle 16 o ). Short distribution profile Height to underside of beam: 2600mm. Air flow: 22 l/s per active metre. Pressure in air channel: 60 Pa. t room - average water temperature: 9.0 o C. t room - Supply air temperature: 5.0 o C. Air speeds with short distribution profile (nozzle angle 30 o ). Cast length (0.2 m/s) with standard distribution profile (nozzle angle 30 o ). 19
20 Long distribution profile Height to underside of beam: 2600mm. Air flow: 22 l/s per active metre. Pressure in air channel: 60 Pa. t room - average water temperature: 9.0 o C. t room - Supply air temperature: 5.0 o C. Air speeds with standard distribution profile (nozzle angle 0 o ). Cast length (0.2 m/s) with standard distribution profile (nozzle angle 0 o ). 20
21 Scatter diagrams, Polaris-I-60 The measurements are carried out with cooled supply air ( t room air - supply air o 5C) and cooling in the water circuit ( t room air - average water temperature 8 o C). All heat supplied through walls. Air speeds under chilled beam at air flow of 16 l/s per active metre. Standard distribution profile (16 o C angled nozzles) Air distribution against wall with desk Air distribution across ceiling Air distribution against wall with shelf Air distribution against free wall 21
22 Scatter diagrams, Polaris-I-60 The measurements are carried out with cooled supply air ( t room air - supply air o 5C) and cooling in the water circuit ( t room air - average water temperature 8 o C). All heat supplied through walls. Air speeds under chilled beam at air flow of 22 l/s per active metre. Standard distribution profile (16 o C angled nozzles) Air distribution against wall with desk Air distribution across ceiling Air distribution against wall with shelf Air distribution against free wall 22
23 Scatter diagrams, Polaris-I-60 The measurements are carried out with cooled supply air ( t room air - supply air o 5C) and cooling in the water circuit ( t room air- average water temperature 8 o C). All heat supplied through walls. Air speeds under chilled beam at air flow of 28 l/s per active metre. Standard distribution profile (16 o C angled nozzles) Air distribution against wall with desk Air distribution across ceiling Air distribution against wall with shelf Air distribution against free wall 23
24 Pressure drop in water circuit, cooling Pressure drop, cooling 15 pipework Minimum permitted flow=0.035kg/s Pressure drop, cooling 22 pipework Minimum permitted flow=0.07kg/s Water flow Effect (W) = water flow t = Temp. diff. Water in water out Minimum permitted flow = kg/s (4200 x t) Example: 500W at 500 ( (4200 x 3) ) t 3 o C (e.g. + 14/+17 o C) gives flow: 0.04 kg/s 24
25 Pressure drop in water circuit, heating Pressure drop, heating 15 pipework Minimum permitted flow=0.035kg/s Water flow Effect (W) = water flow t = Temp. diff. Water in water out (4200 x t) Example: 500W at t 10 o C (e.g. + 55/+45 o C) gives flow: 0.01 kg/s 500 ((4200 x 10) ) 25
26 Control Frenger Systems can offer a control system which is very simple to use. To avoid heating and cooling being on simultaneously, the system is controlled in sequence. See separate brochure for technical data. Room control Fig. 1 Room control in a large building or smaller spaces. Where flexible room division and temperature adjustment are high requirements. The thermostat is usually placed on the wall by the door about 1.2m above floor level. Colour Polaris-I-60 is powdercoated as standard in NCS 0502-Y/RAL 9010, gloss 30%. other colours can be ordered specially. Required Information Product/version: Polaris-I-60 Width, cm: 60 Connection dim. Water, mm: 15 or 22 Connection dim. Air, mm: 100 (double) or 125 (single) Coupling alternatives: Air: A, B, C or D Water: 1,2,3,4,7,8 Length, m: Length in metres Air quantity: specify as (l/s) Air pressure: specify as (Pa) Distribution profile: Standard (16 o ), Short (30 o ), Long (0 o ) Plus features: See page 8 Example Sequential control of cooling and heating. Supply beams from Frenger Systems Qty. Polaris-I A1-1.8m 40 Air quantity: 20 l/s. Air pressure: 60 Pa Short distribution profile (30 o ) Plus feature: Drypac Polaris-I A4-3.0m 20 Air quantity: 50 l/s. Air pressure: 60 Pa. Standard distribution profile (16 o ) Plus feature: Drypac, heating Other additional features Regula room thermostat for sequential control 60 Integrated control valve for cooling, dim Integrated actuator for cooling 60 Actuator for heating adapted for brand X 20 Actuator for cooling adapted for brand Y. 20 Frenger Systems damper 20 Fig. 1 26
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28 In accordance with our policy of continuous improvement, we reserve the right to amend any specification without prior notice. Details produced in this brochure may not be copied and are not drawn to scale. August Frenger Systems Limited Delta House Shaftesbury Street South Derby DE23 8YH +44 (0) (0) e sales@frenger.co.uk Certificate No: FS
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