PACIFIC fully integrates a capacity module and design module. The design module is designed to allow for easy servicing and access to controls. Return openings can be integrated into the design module to achieve a clean look in the ceiling. The capacity module, which can be selected independently from the design module, provides optimum performance and comfort.
PACIFIC | PACIFIC Hi-Cap | |
Primary Airflow | Typical 116 CFM (up to 200 CFM) | Up to 315 CFM |
Pressure Range | Typical 0.5 in WG (up to 0.75 in WG) | Typical 0.5 in WG (up to 0.75 in WG) |
Cooling Capacity | Up to 8872 Btu/h | Up to 13977 Btu/h |
Heating Capacity | Water: upto to 10236 Btu/h | Water: up to 12707 Btu/h |
Lengths | Min. 47 in /max. 120 in* | Min. 47 .8in/max. 119.8 in* |
Widths | Min. 23.4 in/ max. 26.26 in* | 23.7 in |
Heights | 6.4 in – with Ø 4 in air connection 7.4 in – with Ø 5 in air connection 10.9 in – with Ø 6 in air connection | 10.6 in |
The PACIFIC and PACIFIC HC are active chilled beams with two-way air distribution. The units do not contain a fan of its own but is driven by the pressure and flow generated by a centrally located air handling unit, which means low sound level and excellent comfort in the room. The PACIFIC models are designed for dry systems, i.e. without condensation and therefore do not require any condensate drainage system or any filter. The minimum number of moving parts and lack of filter guarantees very little need for maintenance.
The PACIFIC chilled beams operate according to the induction process. A centrally located air handling unit distributes primary air via the duct system into the plenum of the unit and creates excess pressure. The plenum is equipped with a number of sliding strips that in turn contain a row of nozzles of various sizes. The excess pressure in the plenum forces the primary air through the nozzles at relatively high velocity. When the primary air is distributed at high velocity through the nozzles, negative pressure is created in the space above the built-in heat exchanger (water coil). The negative pressure draws (induces) the room air up through the heat exchanger where the air is treated as required.
Active chilled beams utilize the induction process to cause room air to pass through the chilled beam to heat and cool the air and create a comfortable environment.
Induction Principle
The PACIFIC chilled beam has been developed for generating high cooling and heating capacity without compromising comfort. The outlet of the unit is designed to handle large pressure and flow ranges while maintaining the Coanda effect. The result is that the discharged air is kept near the ceiling and mix with the room air and its velocity decreases before it reaches the occupied zone. This provides an excellent indoor climate with low air velocities.
To achieve the best thermal comfort and account for future changes in the space (repurposing) PACIFIC Chilled beams include adjustable nozzles and Anti Draught Control (ADC).
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Delivering a comfortable environment is more than just heating and cooling the space, it requires well distributed air. Swegon Anti Draught Control (ADC) helps change air flow patterns for the best comfort level.
PACIFIC nozzle strip adjusted in three positions. L, M and H.
The PACFIC chilled beam’s adjustable nozzles allow the capacity of the chilled beam to be field changed without any tools. The nozzles can be adjusted in 12 inch (30 cm) increments on each side. Each increment has three settings allowing for accurate adjustment to meet the needs of the space now and in the future. To further augment the capacity range, PACIFIC chilled beams come in three models – LF, MF and HF. Each model has its own set of adjustable nozzle ranges.
Pacific HC Adjustable Nozzles
The PACIFIC HC adjustable nozzles utilize a sliding plate that can be adjusted with a screwdriver.
The goal of a well designed and operated chilled beam system is to obtain even temperature distribution throughout the space and avoid drafting (too fast air movement). To achieve this, PACIFIC chilled beams include The ADC (Anti Draught Control) as a standard feature. They are an option for the PACIFIC HC.
ADC consists of a number of sections with adjustable fins arranged in the outlet of the unit with a simple grip of the hand, the fins can be set to an appropriate angle to direct the discharge air and in this way create the desired air distribution pattern. The standard setting for ADC is straight but the unit can be supplied factory-preset to a V-shape distribution pattern if desired
Anti Draught Control (ADC)
ADC set to the V-shape setting
The Swegon PACIFIC and PACIFIC HC are Eurovent certified, which is your guarantee that all specified data has been confirmed by tests and has been validated. This includes data provided in Swegon’s selection software, ProSelect Web. Click here to learn more about Chilled Beam Certification.
In Addition, the PACIFIC and PACIFIC HC chilled beams are certified by Intertek to UL 1995- Heating and Cooling equipment and CAN/CSA C22.2.
Standard PACIFIC
PACIFIC HC
PACIFIC and PACIFIC HC are designed to be installed in suspended ceilings, drywall ceilings, clouds or suspended pendant style. The PACIFIC and PACIFIC HC design module (faceplate) is designed to fit in most standard ceiling grid systems. Customized modules are available for integration in most suspended ceiling systems available in the market.
Hinged face plate.
The PACIFIC and PACIFIC HC face plate is hinged and can be swung out from either side to a 90-degree open position. This completely exposes the coil for cleaning. Safety cords secure the face plate and ensure that is cannot fall down.
The PACIFIC HC (High Capacity) chilled beam can deliver more primary air to the space which can be beneficial for spaces such as laboratories. The high primary airflow can also lead to increased cooling capacity per beam which can assist in spaces with high internal heat gains such as computer rooms and dry laboratories.
The Standard PACIFIC Chilled beam is designed with an ultra-low profile to fit in small ceiling spaces. For new construction, reduced ceiling space can significantly reduce construction costs by lowering the overall building height. For retrofit construction, the PACIFIC chilled beam call allow higher suspended ceilings improving the aethetics and occupant experience.
Standard PACIFIC Design module and Capacity module
The Standard PACIFIC chilled beam is supplied as a single unit but the Capacity Module and Design Module can be independently selected.
Standard PACIFIC with Built-in access panel using shorter capacity module
In certain cases it can be advantageous to select a design module that is extra-long in relation to the capacity module. One typical case is when the beam is installed in a drywall ceiling and there is a need for inspecting the valves and/or the commissioning damper. By employing a design module that is longer than the capacity module there is built-in access to the air and water connections and controls. The inactive section of the design module is covered to avoid acoustic disturbance and to conceal the space above the false ceiling from occupants of the room.
The capacity module is always installed offset toward the one end panel with the water connection on the side where the inactive section is situated.
Standard PACIFIC Chilled Beam with continuous Linear Look
The ability to choose the Design and Capacity Modules separately allows a cost effective means for create a linear look in the ceiling. The design models can be run continuously across the room awhile the Capacity models are only placed wither they are needed. This look can be accomplished in suspended ceiling, open ceilings or clouds.
Pacific SA/EA Option
The Standard PACIFIC chilled beam has the Supply Air/ Extract Air (SA/EA) option. The SA option allows additional primary air to be delivered to the space via the diffuser component of the chilled beam. For example, conference rooms may require increased primary air during high occupancy for improved indoor air quality and humidity control. A VAV damper in conjunction with the SA option can be used to deliver the additional ventilation air without required a diffuser in the space..
The left image shows a PACIFIC chilled beam with SA feature to deliver additional ventilation air; the Right image shows unsightly additional diffusers for increased ventilation air.
The R/A feature allows the design module to act as a return air grille and can be used in open ceiling return or duct return designs. In either case, an unsightly return air grille can be avoided by providing a clean ceiling design.
PACIFIC Chilled Beam with Coanda Wings
To maintain the Coanda effect when the PACIFIC and PACIFIC HC chilled beams are used in an open ceiling concept, optional Coanda wings can be supplied. The wings help ensure proper airflow and mixing to maintain a comfortable environment even when there is no ceiling for the air to travel along.
To maintain the Coanda effect when the PACIFIC and PACIFIC HC chilled beams are used in an open ceiling concept, optional Coanda wings can be supplied. The wings help ensure proper airflow and mixing to maintain a comfortable environment even when there is no ceiling for the air to travel along.
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Web-based software for easy dimensioning and selection of room products: induction units, air diffusers, displacement units and products for demand-controlled ventilation.
Recommended limit values – water
Max recommended operating pressure: | 232 PSI |
Max. recommended test Pressure: | 348 PSI |
Min. cooling water flow*: Capacity module: L=86.6, 106.3 in |
0.7 GPM |
Min. permissible heating water flow*: | 0.21 GPM |
Chilled Water Delta T | 3.6 – 9°F |
Hot Water Delta T | 9 – 18°F |
Min, supply flow temperature: | Should always be sized to avoid condensation |
Max. permissible inlet flow temperature: | 140°F |
*Min. recommended water flows to ensure the entrainment of any air pockets in the circuit.
Recommended limit values – air
Max. recommended inlet pressure: | 0.75 in WG |
Max. recommended nozzle pressure: | 0.2 in WG |
PACIFIC chilled beams installed in a suspended ceiling
The PACIFIC is designed for installation flush-mounted in the majority of false ceilings available in the market.
T-section grid systems with IP units (NA)
T-section grid systems with 600 mm c-c and gypsum ceiling
T-section grid systems with 625 mm c-c
T-section grid systems with 675 mm c-c
Clip-in ceiling / sheet metal modules 598 in
PACIFIC hanging bracket
PACIFIC drywall plaster flange kit
A drywall plaster flange kit is available for installing Pacific Chilled Beams in a dry wall ceiling. The kit snaps to the chilled beam hiding the plaster edge and providing a clean, finished look.
Example with straight air and vertical water connections
Example with air and water connections from the side
Example with straight horizontal air and water connections
Example with of beam suspension with threaded roots
Example of beam suspension with mounting strips
The Standard PACIFIC chilled beam can have the primary air connected to either end and is field selectable. The Connection sizes are 4”, 5” and 6” round depending on the beam size.
The beam can be 2 pipe or 4 pipe depending on the application. The water connections are 12 mm or ½ NPT. Steel braided hoses with 12 mm push on for the chilled beam connection are a common means to connect to the beam. The building connection can be NPT or compression fitting as required. Click here for other chilled beam accessories
Standard PACIFIC with Primary Air Tee Connection and SA/EA Option
End connections allow a single branch duct to connect to two beams reducing the required ductwork and lowering installation cost.
PACIFIC HC Air Connections
The PACIFIC HC air connections are center side and can be field changed to center top. Top connections are advantageous when the plenum height allows the ductwork to pass over the top of the chilled beams and a flex connection can be used from the bottom of the duct to the top of the chilled beam reducing fittings and first cost. The connection size is 5”, 6” or 8” round depending on the beam size.
The beam can be 2 pipe or 4 pipe depending on the application. The water connections are 12 mm or ½ NPT. Steel braided hoses with 12 mm push on for the chilled beam connection are a common means to connect to the beam. The building connection can be NPT or compression fitting as required. Click here for other chilled beam accessories
PACIFIC HC Water Connections
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A | B | C | ||
---|---|---|---|---|
Unit Length* | Coil Length ** | Dry Weight | Weight of Cool Water | Weight of Hot Water |
4′ | 4′ | 36 | 2.4 | 0.7 |
6′ | 4′ | 41 | 2.4 | 0.7 |
6′ | 6′ | 50 | 3.3 | 0.1 |
8′ | 6′ | 50 | 3.3 | 0.1 |
8′ | 8′ | 69 | 4.6 | 0.1 |
10′ | 8′ | 74 | 4.6 | 0.1 |
10′ | 10′ | 84 | 5.8 | 1.5 |
L – Unit Length | ||||
---|---|---|---|---|
Nominal Length FT | 4′ | 6′ | 8′ | 10′ |
Order Code | 1213 | 1823 | 2433 | 3043 |
Actual Length IN (“) | 47.76 | 71.77 | 95.79 | 119.80 |
C – Unit Length | ||||
---|---|---|---|---|
Nominal Length | 4′ | 6′ | 8′ | 10′ |
Order Code | 1100 | 1600 | 2200 | 2700 |
Actual Length IN (“) | 43.5 | 64.4 | 87.1 | 107.9 |
a – access | 3.2 | 6.4 | 7.7 | 10.9 |
Nominal Length | Availability, L – Unit Length | |||
4′ | 6′ | 8′ | 10′ | |
4′ | ⊗ | |||
6′ | ||||
8′ | ||||
10′ |
Active Chilled Beam Cross Section
An active chilled beam is basically a cabinet with a water coil. There are no moving parts such as a fan and motor (i.e. fancoil). To get air in the space to pass through the coil, the induction principle is applied using primary air from a main air handling unit. The room air is “induced” to pass through the coil by creating a low pressure zone above the coil. As air passes through the coil, it can be heated or cooled using hot or chilled water. The induced air and the primary air mixed and delivered to the room via diffusers that are designed into the chilled beam to optimize mixing and take advantage of the coanda effect.
Induction Ratio
The ratio of induced air to primary air is the Induction Ratio. For example, if 1 cfm of primary air induces 3 cfm or room air to pass through the coil, the induction ratio would be 3 to 1 and 4 cfm would be delivered through the diffuser to the space.
Induction Process
The reason the induction process works can be seen in Bernoulli’s principle.
Said in words, if you increase the kinetic energy (the speed) of a fluid then its pressure must go down. In a chilled beam, the primary air passes through a nozzle bank and its speed increases, thus its pressure goes down and low pressure area is created downstream of the nozzle bank (above the coil).
This principle is how perfume atomizers and carburetors work, why sail boats can sail into the wind and of course, why airplanes fly.
To get room air to pass through a coil, work is being done and energy used. In a fancoil, the energy is electricity that the fan motor consumes to operate the fan. In a chilled beam the energy source is the primary air handling unit. The primary air must be delivered to the chilled beam and overcome the pressure drop of the nozzle bank. The nozzle bank requires more external static pressure at the air handling unit. Typically the fans and motors in air handling units are much more efficiency that mall fans and motors used in terminal products.
One way to look at the energy usage in a chilled beam is to consider the air flow rate (cfm) as equal to electrical current and the pressure drop of the nozzle bank as equal to voltage. Some combination of airflow are and pressure drop (i.e. voltage and current) will provide the necessary energy to draw room air through the coil.
Modern chilled beam design has advanced to the point where the pressure drop across the nozzle bank is less than a 0.25 inches w.c. and typically around 0.5 inches w.c. for the whole chilled beam (which includes the diffuser components.)
Induction Process in Swegon PACIFIC Chilled Beam
Induction Process in Swegon PARASOL Chilled Beam
Chilled Beam Slot Nozzle
Chilled Beam Round Nozzle
Nozzles come in all sorts of shapes and sizes. A orifice plate is a nozzle. Nozzle design in chilled beams has evolved to create the best induction result with the lowest pressure drop and noise level.
Nozzle selection is based a specific operating conditions and is very sensitive to changes in the design conditions. As primary air passes through a small opening it accelerates. In a very complicated fluid dynamics process, the shape of the jet profile, plenum geometry, jet velocity and other properties will create a low-pressure area I the plenum that will cause room air to be drawn into the plenum via the coil and then pass out through the diffuser slots back to the room.
If the building design requires a small amount of primary air (i.e. “low current”) then the chilled beam selection will use small nozzles to induce more room air but requiring a larger pressure drop (i.e. “high voltage”) to get enough room air to pass through the coil to meet the cooling and heating demands. In short, the induction ratio will go up.
Nozzle K Factor
Changing the nozzle size and properties is known as changing the k factor. k factors are listed on the chilled beam printouts and can be used by the balancing contractor to measure the amount of primary air entering the chilled beam.
Where
q = (primary) airflow in cfm or l/s
K = k factor (note the k factor has a different value for SI or IP units)
P = the pressure drop across the nozzle bank in Pa or inches w.c.
If the chilled beam is manufactured with a fixed nozzle size (fixed k factor), then any changes in the design conditions in the future will be very limited. For example if the space ventilation rate, cooling or heating loads change appreciably, adjustments in the beam performance will be very restricted to the point where the beam may need to be replaced.
Adjustable Nozzles
Adjustable nozzles solve this issue by allowing the nozzle design to changed as the needs of the space evolve. You can change the K factor in the field. Adjustable nozzles must be built into the product at time of manufacture. Most nozzle adjustments can be achieved by hand or with hand tools.
Modulating Nozzles
The ultimate form of adjustability is a Demand Control Ventilation or VAV chilled beam where the nozzle adjustment is motorized and varies based on the amount of primary air entering the chilled beam. DCV chilled beams have variable k factors than maintain the induction process over a large primary airflow rate. As the primary airflow rate is reduced to save energy, the k factor changes and the induction process continues allowing space control. Click here to learn more Chilled Beam Design.
Swegon Test Lab set up to check air distribution mimicking computer and occupant heat sources
Chilled beams not only provide heating, cooling and ventilation air, they are the air distribution component that delivers good thermal comfort. Being able to adjust the airflow pattern from the chilled beams is critical to delivering optimal occupant comfort. As the building use evolves (re-purposing) the space loads and layouts change often requiring air pattern adjustments to maintain thermal comfort.
ADC in Swegon PARASOL Chilled Beam
To achieve air pattern control Swegon chilled beams can adjust the airflow pattern by means of Anti Draught Control (ADC). ADC consists of a number of sections with adjustable fins arranged in the outlet of the unit with a simple grip of the hand, the fins can be set to an appropriate angle in 10 degree increments to direct the discharge air and in this way create the desired air distribution pattern.
ADC in PACIFIC Chilled Beam
ADC in ADRIATIC Chilled Beam
ADC in PARAGON Chilled Beam
The ADCs are adjusted to spread the primary and induced airflow evenly in all directions across the ceiling for maximum even air distribution.
The ADCs deliver an X pattern airflow that avoids the airflows from to adjacent beams running into each other and breaking away from the ceiling resulting in “dumping”. The X pattern allows more chilled beams in the ceiling for increased cooling capacity (i.e. a computer classroom) without compromising thermal comfort.
The ADC biases the airflow pattern in one direction to increase throw and focus cooling or heating capacity yin a particular part of the room such as an exterior wall. Alternatively, if the space is repurposed and a new partition is built near the chilled beam, the airflow pattern can be directed away from the partition avoiding relocating the chilled beam.