mistrale fusion - gilberts blackpool · 2020. 7. 20. · or 256 (high capacity) litres per sec of...

MistraleFusion Terminal

PUBLICATION

NATURAL VENT. 1

JUNE 2020

Dynamic Hybrid Ventilation

FUSION CONTROL TERMINAL

Natural ventilation, unlike mechanical fan forced ventilation, simply

uses the naturally occurring pressure differential forces of air

movement, wind and buoyancy to deliver a steady supply of fresh

air for building ventilation and space cooling. In an era where energy

conservation is at a premium this sounds ideal.

Indeed Naturally Ventilating a building can offer the best of

both worlds combining little or no energy consumption with low

capital costs, whilst still providing adequate fresh air and comfort

temperature conditions throughout the year. With the plant room

also eliminated, services space minimised and lower servicing/

maintenance costs Natural Ventilation now makes for one the most

practical choices of the day.

Modern buildings in the UK with their low u values, low air leakage

and high heat gains typically have a high cooling requirement. The

climate in the UK and many parts of central through Northern Europe

is perfectly suited for Natural Ventilation type applications with low

extremes of temperature providing an ample supply of fresh cooling

air even in a typical summer.

Gilberts Mistrale series offers a range of products designed and

engineered to provide a variety of energy efficient cooling and ventilation solutions.

Incorporating an ultra low power fan our new Mistrale MFS is not in

the strictest sense a full natural ventilation solution however, instead,

it does allows us to harness this free natural cooling energy source

both reliably and efficiently… but with added benefits. One of the latest innovations in ventilation our new design “Fusion” terminal is

able to provide an extremely low cost ventilation solution with the

added benefits of heat recovery.

Unlike a normal full natural ventilation solution MFS is a dynamic

hybrid that includes an ultra low power fan assistance feature able

to energise in poor air movement conditions to ensure adequate

ventilation at all times. Whilst fan power assistance may seem at

odds with a low energy ventilation concept it is important to point out

that the fan is there to provide only occasional support ensuring that

the terminal operates at all times to provide design heat recovery

and ventilation requirements. And it is truly energy efficient. With a design consumption of just 34kw per year per classroom Mistrale

MFS costs less than £5* per classroom per year yet guarantees full

operational ventilation and cooling efficiency at all times.

Unlike other designs, Mistrale MFS is a stand alone system

providing adequate ventilation and cooling without the need for

supportive systems such as opening windows although it can still

be integrated with other heating, cooling or ventilation strategy if

required.

*Based upon energy cost of £0.12 per kw/h.

Energy Efficient Ventilation

Fusion Terminal

2

33


• Standard slimline terminal MFS/128 (128 L/s)

• High capacity slimline terminal output MFS/256 (256 L/s)

• Boost feature available to increase output to 256L/s on MFS/128

and 512 L/s on MFS/256

• Highly energy efficient ventilation solution

• Compliant with DoE guidance on ventilation

• Accurate air and temperature control with free cooling and heat

recovery

• Full summer evacuation mode with fan boost to meet all BB101

and PBSP overheat requirements

• Includes CO2 override to meet current D of E guidelines

• Operator overrides with easily adjustable set points

• Clear indication of control strategy for users/occupants

• Single wall or façade location with no need for either transfer into

corridors or a stack reducing both cost and noise transfer

• Low noise operation to meet current D of E guidelines (BB93)

• Optional glazing panel positioning to avoid builders work

• No ductwork requirement and maintenance free

The terminal uses natural air buoyancy with low power fan

assistance to deliver a steady supply of fresh air from a single wall/

window façade whilst allowing it to blend controlled amounts of

mixed extract air for heat recovery.

The concept is simple and was driven by the need to enhance our

natural ventilation solutions to include a unit situated in just a single

wall or façade but able to control the internal room space accurately

all year round irrespective of weather, wind or temperature

conditions and with the added benefit of using previously discarded warm air for heat recovery without a heat exchanger.

Design Profile and Key Features

4


Normal mode would be during typical winter, autumn or mild

weather conditions with temperatures ranging between -5 and

+20c. In these instances standard room heating (radiators etc)

would be employed to bring the room up to temperature (around

20˚C)

As the room becomes occupied we can expect the heat load

to increase and room temperature to rise. At a given set point

(typically 22˚C) the terminals will come on line and open the fresh air inlet damper allowing cool air to permeate into the room space.

The fan is also energised to assist with air distribution ensuring

that 2 MFS/128 units can deliver the full provision of 256 litres/sec

of fresh air (8 l/sec for a 32 person classroom). The fan provides

the correct air velocity to avoid dumping and to ensure an even

distribution of airflow throughout the space.

Whilst fresh air provision must be maintained for comfort conditions

we also need to be careful to avoid any differentials between the

room and cooling air. To ensure the fresh inlet air stays within these

parameters the terminal includes temperature sensors that control

a mixing damper which modulates to allow warm exhaust air to be

re-circulated. By doing so the terminal can temper the cool air to

ensure a maximum temperature differential of 10˚C.

The room temperature and ventilation will continue to be controlled

automatically within the set point criteria for the room. The terminal

includes a CO2 sensor as well as room temperature sensor and

can vary fresh air inlet and recirculation to ensure that maximum

CO2 levels are not breached.

When heat loads are removed, such as during breaks or lunch, the

room will be balanced to a neutral status and the unit will go into

standby. Fresh air dampers will be closed and the fan switched

off. The terminal will remain in standby until either variations in

temperature or Co2 are significant enough to activate the unit.

When the set point for the room exceeds 22 degrees the damper

will fully open and the fan will cycle providing fresh air cooling for

warm air evacuation.

The fan will provide additional boost if outside temperatures do not

fall sufficiently for natural cooling.

How does the Mistrale Fusion Terminal work?

Normal Mode

Summer Mode

Clearly throughout a typical year both the external and internal environments

vary greatly depending upon weather and occupancy factors.

5


Outside of normal hours of operation when the room exceeds 20

degrees the damper will fully open and the fan will cycle providing

100% fresh air cooling for warm air evacuation.

Once room temperature drops below set point (typically 20˚C)the fan shuts down and cooling air will be drawn in naturally until room

temperature hits the minimum room set back (typically 15˚C). The fan will provide additional boost if outside temperatures do not

fall sufficiently for natural cooling. Once the room temperature is achieved the damper will close and seal the building.

• Average internal air temperature is not to exceed

5°c over the average external air temperature.

Mistrale design solution is engineered to control the air

temperature to the standard with additional fan boost to ensure

compliance.

• Minimum fresh air rate of 5 l/s per person. This is to ensure

adequate ventilation and control levels of CO2.

• Each Mistrale MFS terminal is designed to deliver 128 (standard)

or 256 (high capacity) litres per sec of fresh air. The eco boost

fan will cycle to ensure this demand is met under all climatic and

temperature conditions, with a boost volume up to double initial

fan capacity.

• Limit daytime average concentrations of CO2 to less than

1000ppm with a max of 1500ppm for no more than 20 minutes.

• Each standard Mistrale MFS/128 will deliver up to 128 litres per

second of fresh air to each classroom ensuring that, using 2

units, a 32 child classroom and staff benefit from an adequate ventilation rate of 8 litres per sec per person. The larger high

capacity terminal increases the output to 256 L/s from a single

terminal. This ventilation rate ensures that CO2 levels are

controlled within the defined parameters. Classroom CO2 sensors modulate fresh and recovered air to accurately maintain a healthy

CO2 level and a boost mode can provide up to 10 l/s per person

initially with a further boost up to 16 L/s per person available.

To prevent draughts and discomfort the air speed flowing across occupants should be less than 0.15 m/s in winter and 0.25 m/s in

summer.

Mistrale is a hybrid natural ventilation solution using natural

air flows with occasional eco fan assistance to provide comfort conditions. Air velocities are naturally low. Gilberts have 60 years

of Air Distribution experience and have designed internal grille

outlets to ensure velocities within the room are optimal.

• Ventilation design should where possible recover heat gains from

occupancy.

By design Mistrale MFS includes heat recovery where warm re-

circulated air is recycled to improve efficiency and performance.

• Noise levels in a standard classroom should be at or below 35

dbA. (BB93)

• Mistrale MFS is designed to operate under silent natural

ventilation conditions with occasional eco fan boost. Running at

low voltage and speed the fan operation is quiet with acoustic

insulation in the terminal casing ensuring whisper quiet operation

well below 35dbA.

• Staff override control of ventilation should be provided to allow

extra control over noise and ventilation levels.

Mistrale terminals and controls feature a simple and clear override

for occcupant control.

The Department of education has issued detailed guidance on the ventilation, comfort

and indoor air quality requirements for school buildings and sets clear performance

standards that they should meet. Gilberts design team have worked in close

consultation with this framework to ensure that our solutions are proven to meet or

exceed these key requirements

Night cooling mode

Specification Checklist

Department for Education Guidance

6

3

55

.00

1393.60

3

10

.00

84.20

9

45

.00

Glass thickness

800.00

9

66

.00

141.00


Side Elevation

Top View

Front Elevation

Mistrale Fusion

- Standard MFS/128

• Slimline unit

• 128 L/s capacity (256L/s in boost mode)

• Normally 2 units per classroom

• Multiple fitting options• Optional heating coil and filter

7

3

10

3

45

1

70

0

1

76

6

1266 142

1

75

5

Glass thickness

1893


Side Elevation

Top View

Front Elevation

Mistrale Fusion

- High Capacity MFS/256

• High capacity unit

• 256 L/s capacity (512L/s in boost mode)

• 1 unit per classroom

• Multiple fitting options• Optional heating coil and filter• Alternative square faced outlet available

8


The design of Mistrale MFS

Combination Louvre means that

cross contamination (where stale air

enters the supply/fresh airstream) is

eliminated.

The terminal includes separate internal

supply and return air chambers which

connect to a specially designed external

louvre.

In turn the louvre is profiled and segregated to exhaust warm stale air

through the top section and draw cool

fresh air through the lower section.

The intake louvre is a registered

design with it’s unique segregation

features ensuring that contaminated air

transference is not possible.

Intake/Discharge Combined Louvre

®REGISTERED DESIGN 5002854

Cross Contamination

8

Designed as the air inlet and exhaust outlet for the MFS terminals.

Specific frame borders allow the unit to glaze into windows or be fitted to wall and cladding surfaces.

9


WMF Flanged Louvre

WMC Channel Louvre

Locates into

the frame

Located

into frame

10


WMZ Glazed In Louvre

Window Frame

11


Mistrale Solutions

Side Elevation

Mistrale Fusion MFS/128

Front Elevation

In this application the terminal is free

standing on the ceiling and will distribute

cooling air through its integral air

distribution grilles. Intake and exhaust

air is drawn through a combined intake/

discharge louvre glazed into the window.

Top View

12


Mistrale Solutions


Side Elevation Front Elevation



cooling air through ducted connections

to grilles or diffusers located elsewhere

in the room. Intake and exhaust air

is drawn through a combined intake/


Top View

13


Mistrale Solutions


Side Elevation

Top View

Front Elevation



cooling air through its integral air

distribution grilles. Intake and exhaust

air is drawn through a combined intake/


14


Mistrale Solutions


Side Elevation

Top View

Front Elevation



cooling air through ducted connections

to grilles or diffusers located elsewhere

in the room. Intake and exhaust air

is drawn through a combined intake/


Equally the louvre can be specified for wall/cladding fixing.

15


MFS Filter module

The MFS Fusion allows for the inclusion of an extra filter module to help provide fresher cleaner air especially in more urban applications. The F7 type filters are designed to remove very fine dust particles including soot, pollens, mould spores and bacteria.

Additional option available for an F7NOX filter.

• High efficiency F7 multi-pocket bag filters.

• Large surface area filters with high dust holding capacity and low pressure drop

• Modular design ensures ease of maintenance

and replacement.

16


Duct Extentions

Whilst in an ideal world all hybrid units would fit directly to an optimum sized louvre without the need for any transition,

unfortunately this is not always practical. Service layouts, main

structure, Architectural considerations and planning requirements,

to name but a few, can all impact on the ventilation service layout.

Utilising knowledge built up over many years, Gilberts have tried

to solve this issue with a range of Duct Extensions (DE) that cater

for most site-specific conditions. These units employ the same hanging flange technology that allows the louvre and MFS product

to fit together quickly and seamlessly. This reduces install times, maintains intake and exhaust air paths and delivers an integrated

building solution that performs functionally and aesthetically, from

outside to inside.

Straight Connection Module to extend the MFS away from the

louvre and further into the room. DE-SN is for louvres narrower

than the MFS and will usually need a DE-AL, DE-AR or DE-AC as

well. Length (DIM L) from 200mm to 600mm in 50mm increments.

“Periscope” Connection Module to lift an MFS module higher

than the louvre. Height (DIM H) from 100mm to 500mm in 50mm

increments.

DE-S and DE-SN

DE-P

Isometric View

Isometric View

Side Section

Side Section

Dim L

Dim H

17


Elbow Module to change the direction of the MFS from the louvre at

a 45-degree angle. DE-EL turns to the left when viewed from inside

the building. DE-ER turns to the right.

Adaptor Module to connect an MFS to a narrow louvre. DE-AL kicks

to the left when viewed from inside the building. DE-AR kicks to the

right and DE-AC is symmetrical.

DE-EL and DE-ER

DE-AL, DE-AR and DE-AC

DE-UD and DE-UDS

Isometric View (DE-ER shown)

Isometric View (DE-AR shown)

Isometric View (DE-UD) Isometric View (DE-UDS)

Both boxes change the orientation of the air from being horizontal or

up/down distribution to being vertical or side/side distribution. This

means being able to connect directly to the back of a Gilberts WH or

WP50 traditional 45-degree louvre blanked in the centre, in the case

of the DE-UD. The DE-UDS has 2 spigot connections that allow

connection to separate louvres or even to roof mushroom outlets

where access to an external wall is not possible.

18


DE-OL and DE-OR

Isometric View (DE-OR shown)

SIDE SECTION OFFSET SIZES

PLAN VIEW

Connection Module to sideways offset the MFS from the louvre. DE-

OL kicks the MFS to the left when viewed from the inside. DE-OR

kicks the MFS to the right. The OFFSET SIZE is 100mm to 500mm

in 100mm increments for the MFS128 and 100mm to 300mm in

100mm increments for the MFS256. DIM L increases the more the

unit is offset in order to maintain cross sectional areas and keep any

additional pressure to a minimum.

Offset Dim O (order sizes)

100

200

300

400

500

Dim L128 units

300

500

600

700

800

Dim W128 units

1000

1100

1200

1300

1400

Dim L256 units

400

700

900

Dim W256 units

1800

1900

2000

NOT AVAILABLE

NOT AVAILABLE

Dim W

Dim L

310mm

19


Heating Coils

The MFS unit can be supplied with a low temperature hot water

(LTHW) heating coil for initial heating of the classroom and

maintaining room temperature in cold weather. The coil can heat a

typical classroom in 30 minutes on morning warm-up, negating the

need for an additional heating system, saving on installation time

and freeing up valuable floor space that may have been taken by other traditional heating methods such as radiators.

The heating coils terminate with industry standard 15mm copper

connections.

Heating capacities are illustrated in the tables below for various

flow/return values and airflows based on an air on temperature of 13 degrees Celsius.

MFS128 in normal mode delivering 128l/s

of airflow (maintains room temperature)

MFS256 in normal mode delivering 256l/s

of airflow (maintains room temperature)

MFS128 in heat boost mode delivering 256l/s

of airflow (initial heating)

MFS256 in heat boost mode delivering 512l/s

of airflow (initial heating)

Water

60/40

70/40

70/50

80/60

50/40

Water

60/40

70/40

70/50

80/60

50/40

Water

60/40

70/40

70/50

80/60

50/40

Water

60/40

70/40

70/50

80/60

50/40

Air off

20.3

20.5

26.6

30.9

22.3

Air off

21.6

22.6

30

35.2

24.6

Air off

19.6

19.1

24.4

27.9

20.8

Air off

22.6

22

28.3

32.6

23.4

Kw

1.12

1.16

2.09

2.76

1.42

Kw

2.73

3.03

5.38

7.04

3.66

Kw

2.04

1.87

3.5

4.59

2.39

Kw

6.09

5.67

9.69

12.37

6.58

Water flow

0.014

0.01

0.25

0.034

0.034

Water flow

0.033

0.025

0.065

0.086

0.089

Water flow

0.025

0.015

0.043

0.056

0.058

Water flow

0.074

0.046

0.118

0.151

0.159

Pressure drop

0.12

0.06

0.35

0.57

0.64

Pressure drop

0.14

0.07

0.49

0.81

0.89

Pressure drop

0.34

0.14

0.9

1.5

1.6

Pressure drop

0.62

0.25

1.49

2.38

2.72

STANDARD COIL DATA

20


In terms of energy the fan consumption for the MFS Terminals is

less than 23 Watts per classroom. This equates to less than £5 per

annum per classroom during occupied times at current electricity

costs (typ 0.12p per kw/h).

The test program was developed within Gilberts own R&D Test

Facility which has a raised floor and a fully glazed wall adjacent to a cold space area which can be heated or cooled down to minus 5ºC.

This space can therefore effectively simulate both outside winter

and summer conditions.

The MFS units were installed at ceiling height into openings through

the wall into the cold space. The Classroom comfort conditions are

maintained via dampers within the MFS units mixing room air with

conditioned outside air.

All tests and measurements were carried out using certified and calibrated instrumentation.

Results

A series of temperature and velocity readings

were recorded at designated positions.

• All environmental conditions were satisfied.

• Room temperature set point maintained.

• Velocities within the occupied zone were less than 0.25M/s in all

conditions.

• Even distribution of temperatures within the occupied zone and

within 2 degrees of set point.

• Excellent mixing of air within the room with no “dead zones”.

The integral high efficiency fans deliver air volumes of 128 L/s for the MFS/128 or 256 L/s for the MFS/256 in normal operation with the acoustic insulation ensuring that

noise levels meet classroom use requirements (typically less than 35 dbA)

Mistrale MFS has undergone a rigorous

and exacting test regime to validate its

performance

SFP value is just 0.09

Fan Efficiency

Performance Validation

21


Supply Volume (L/s) Each

128

160

190

200

252

128

150

190

200

250


256

320

380

400

558

256

320

380

400

553


128

160

190

200

208

128

160

190

195


256

320

380

400

427

256

320

380

400

427

Coil

N

N

N

N

N

Y

Y

Y

Y

Y

Coil

N

N

N

N

N

Y

Y

Y

Y

Y

Coil

N

N

N

N

N

Y

Y

Y

Y

Coil

N

N

N

N

N

Y

Y

Y

Y

Y

Signal Voltage (V)

3.65

4.50

5.85

6.00

10.00

4.10

4.95

6.00

6.20

10.00

Signal Voltage (V)

3.55

4.45

5.45

5.60

10.00

3.55

4.45

5.70

5.90

10.00

Signal Voltage (V)

4.85

6.20

7.60

8.25

10.00

5.15

6.55

8.50

10.00

Signal Voltage (V)

4.20

6.00

7.25

7.75

10.00

4.20

6.00

7.25

7.75

10.00

SFP(2 units)

0.09

0.12

0.18

0.20

0.33

0.14

0.16

0.20

0.21

0.30

SFP(2 units)

0.09

0.11

0.16

0.16

0.30

0.09

0.11

0.16

0.17

0.30

SFP(1 units)

0.16

0.25

0.33

0.39

0.39

0.17

0.26

0.41

0.41

SFP(1 units)

0.12

0.21

0.29

0.32

0.39

0.12

0.21

0.29

0.32

0.39

d0a(2 units)

28

33

38

39

45

28

34

39

40

44

d0a(2 units)

29

33

38

38

46

26

31

36

37

45

d8a(1 units)

28

34

40

41

41

34

37

40

41

d8a(1 units)

28

36

42

43

45

28

36

42

43

45

Coil Duty(Kw)

-

-

-

-

-

2.35

2.91

3.46

3.64

4.58

Coil Duty(Kw)

-

-

-

-

-

4.37

5.40

6.46

6.80

9.40

Coil Duty(Kw)

-

-

-

-

-

2.35

2.91

3.46

3.55

Coil Duty(Kw)

-

-

-

-

-

4.37

5.40

6.46

6.80

7.26

2 No MFS 128 - Exposed

1 NR MFS 256 - Exposed

2 No MFS 128 - Ducted

MFS 256 - Ducted

Class leading quiet operation and attenuation

INTERNAL NOISE

The MFS unit is very quiet in operation with a background noise as low as 28dBa in normal operation, well below the

threshold of 35dBa allowed in BB93. Noise levels for various layouts and supply volumes are shown below.

22



128

160

190

200

252

128

160

190

200

250


128

160

190

200

128

160

190

200


256

320

380

400

558

256

320

380

400

553

Coil

N

N

N

N

N

Y

Y

Y

Y

Y

Coil

N

N

N

N

Y

Y

Y

Y

Coil

N

N

N

N

N

Y

Y

Y

Y

Y

Signal Voltage (V)

3.65

4.50

5.85

6.00

10.00

4.10

4.95

6.00

6.20

10.00

Signal Voltage (V)

3.65

4.77

5.85

6.20

4.20

5.85

6.90

7.50

Signal Voltage (V)

3.55

4.45

5.45

5.60

10.00

3.55

4.45

5.70

5.90

10.00

SFP(2 units)

0.09

0.12

0.18

0.20

0.33

0.14

0.16

0.20

0.21

0.30

SFP(1 unit)

0.08

0.12

0.17

0.21

0.12

0.19

0.26

0.30

SFP(1 units)

0.08

0.11

0.14

0.14

0.29

0.08

0.1

0.15

0.16

0.29

d0a(2 units)

27

30

36

37

43

27

30

35

36

40

dba(1unit)

25

30

31

32

24

27

30

31

d8a(1 units)

28

32

36

36

43

26

31

35

37

44

Coil Duty(Kw)

-

-

-

-

-

2.35

2.91

3.46

3.64

4.58

Coil Duty(Kw)

-

-

-

-

2.35

2.91

3.46

3.64

Coil Duty(Kw)

-

-

-

-

-

4.37

5.40

6.46

6.80

9.40

2 NR MFS 128 - Exposed + 300 attenuation

MFS 128 - Behind bulkhead

MFS 256 - Exposed + 300 attenuation

23


EXTERNAL NOISE

Further noise tests have also been carried out at a UKAS laboratory

(Salford University) to determine the sound absorption capabilities

of the terminal for outside noise (general and traffic) and ensure the units will not break past the 35dbA general classroom criteria. Noise

reduction values according to BS EN ISO 10140-2 are detailed

below: With the damper full open Mistrale MFS achieved a noise

reduction level of 34Rw and a Ctr (traffic weighted value) of 27.- If a 60dBA non traffic noise was the source a 34 DB reduction would apply with noise reduced to 26dbA in the room space. On this

basis if average outside traffic noise source was 60dbA the noise reduction through the unit would lower room noise ingress to just

33dbA

SALFORD UNIVERSITY NOISE REDUCTION TESTS ON MFS128 AND MFS256 UNITS.

TEST NO. PRODUCT TESTED DAMPER POSITION FAN OFF OR RUNNING VOLUME CONNECTIONS NOISE REDUCTION LEVEL

MFS128 acoustic data

Reason - Initial tests On MFS128 standard set-up in damper closed position to show the level of building seal achieved followed by the full open damper noise reduction

withfanoffandat2setpoints. (This shows the fan volumes when running has no influence on the noise data gathered and can be dismissed.)

Test 1 MFS128 with coil closed off none 52 Rw Test 2 MFS128 with coil open off none 36 Rw Test 3 MFS128 with coil open 128l/s none 36 Rw

Test 4 MFS128 with coil open 200l/s none 37 Rw

Reason - Further MFS128 tests but with duct connections added and 2xDG diffusers as a typical set-up for the

Test 5 MFS128 with coil (grilles off) closed off Duct and DG 55 Rw Test 6 MFS128 with coil (grilles off) open off Duct and DG 39 Rw Test 7 MFS128 with coil (grilles off) open 128l/s Duct and DG 40 Rw Test 8 MFS128 with coil (grilles off) open 200l/s Duct and DG 40 Rw

Reason - To prove the coil does not make a difference so all values previous and further on with a coil can be taken as the same as with or without a coil!

Test 9 MFS128 without coil closed off none 51 Rw Test 10 MFS128 without coil open off none 36 Rw

Reason - To see the effect of increasing the ,length by a further 300mm to gain better acoustic reduction

Test 11 MFS128 with coil 300 longer closed off none 52 Rw Test 12 MFS128 with coil 300 longer open off none 39 Rw Test 13 MFS128 with coil 300 longer open 128l/s none 39 Rw

Test 14 MFS128 with coil 300 longer open 200l/s none 39 Rw

Reason - To see the effect of increasing the length by a further 300mm to gain better acoustic reduction with duct connections added and 2xDG diffusers as a typical set-up

Test 15 MFS128 with coil 300 longer (grilles off) closed off Duct and DG 55 Rw Test 16 MFS128 with coil 300 longer (grilles off) open off Duct and DG 42 Rw Test 17 MFS128 with coil 300 longer (grilles off) open 128l/s Duct and DG 42 Rw Test 18 MFS128 with coil 300 longer (grilles off) open 200l/s Duct and DG 42 Rw

MFS256 acoustic data

Reason - Initial tests On MFS256 standard set-up in damper closed position to show the level of building seal achieved followed buy the full open damper noise

reduction with fan off and at 2 set points

Test 19 MFS256 with coil + Louvre closed off none 52 Rw Test 20 MFS256 with coil + Louvre open off none 35 Rw Test 21 MFS256 with coil + Louvre open 256l/s none 35 Rw

Test 22 MFS256 with coil + Louvre open 400l/s none 35 Rw

Reason - Further MFS256 tests but with duct connections added and 2xDG diffusers as a typical set-up for the

Test 23 MFS256 with coil + Louvre (grilles off) closed off 2x Duct and DG 55 Rw Test 24 MFS256 with coil + Louvre (grilles off) open off 2x Duct and DG 38 Rw Test 25 MFS256 with coil + Louvre (grilles off) open 256l/s 2x Duct and DG 38 Rw Test 26 MFS256 with coil + Louvre (grilles off) open 400l/s 2x Duct and DG 38 Rw


Test 27 MFS256 with coil + Louvre+sil300 (grilles off) closed off 2x Duct and DG 56 Rw Test 28 MFS256 with coil + Louvre+sil300 (grilles off) open off 2x Duct and DG 40 Rw Test 29 MFS256 with coil + Louvre+sil300 (grilles off) open 256l/s 2x Duct and DG 41 Rw Test 30 MFS256 with coil + Louvre+sil300 (grilles off) open 400l/s 2x Duct and DG 41 Rw

Reason - To see the effect of increasing the length by a further 600mm to gain better acoustic reduction

Test 31 MFS256 with coil + Louvre+sil600 closed off none 56 Rw Test 32 MFS256 with coil + Louvre+sil600 open off none 40 Rw Test 33 MFS256 with coil + Louvre+sil600 open 256l/s none 40 Rw

Test 34 MFS256 with coil + Louvre+sil600 open 400l/s none 40 Rw

Reason - To see the effect of increasing the length by a further 300mm to gain better acoustic reduction

Test 35 MFS256 with coil + Louvre+sil300 closed off none 54 Rw Test 36 MFS256 with coil + Louvre+sil300 open off none 38 Rw Test 37 MFS256 with coil + Louvre+sil300 open 256l/s none 38 Rw

Test 38 MFS256 with coil + Louvre+sil300 open 400l/s none 38 Rw


Test 39 MFS256 with coil + Louvre+sil600 (grilles off) closed off 2x Duct and DG 57 Rw Test 40 MFS256 with coil + Louvre+sil600 (grilles off) open off 2x Duct and DG 42 Rw Test 41 MFS256 with coil + Louvre+sil600 (grilles off) open 256l/s 2x Duct and DG 43 Rw Test 42 MFS256 with coil + Louvre+sil600 (grilles off) open 400l/s 2x Duct and DG 43 Rw

24


The Mistrale Control Unit has been designed to offer an effective, efficient anduser friendly control solution for our Mistrale Fusion Hybrid Ventilation Systems.

Mistrale Control Unit (MCU)

• The Mistrale Control Unit (MCU) gives individual automatic room

control. Set within a small attractive wall-mounted panel, the

Controller includes integrated temperature and CO2 sensors, a backlit

LCD display and easy to use push button controls that provide the

user with a wide choice of features without the need for separate

sensors within the room:

• CO2 monitoring and level display.

• Temperature monitoring and level display.

• LED indication for high temperature and CO2 levels

• User control can vary temperature setpoint by +/-2 degrees C.

• User overrides for high operation, vent boost and heat boost

• Can be enabled for Modbus to receive occupancy, morning warm-up

and outside air temp.

• Night Cooling Strategy

• Gas Interlock and Fume Cupboard interlock strategy available for

Science/Design Tech rooms.

• Fresh air ‘morning start’ setting.

• Data logging for performance analysis available when Modbus

enabled

The system will control room CO2 levels to a variable profile ensuring that Indoor Air Quality is always maintained. The Bespoke temperature

control strategy will modulate the ventilation rate, and water coil

(if fitted) flow rate to maintain set internal temperatures. Multiple temperature control strategies based on external temperature will

provide temperature control throughout the year. A night purge cooling

strategy is also included for a fresh morning start in the warmer months,

whilst a morning start-up (if heater fitted) heating strategy will bring the room up to the desired temperature before the rooms are occupied.

The system is designed to meet the Facilities output specification. The system is also compliant for noise attenuation requirements as BB93,

Ventilation requirements of BB101, and thermal comfort levels as

CIBSE TM52.

Each room has one or more MFS ventilation units with combined

controls. The controls consist of a wall mounted controller with built in

temperature sensor, CO2 sensor, and override facility.

For systems with slave MFS units the damper and the fan in the slave

unit mimic the master MFS unit.

A pre-wired junction box is fixed to the side of the master MFS unit to house a power supply, fuses and junction PCB. A slave MFS unit may

also be included which has a junction box on the side for termination

purposes.

Each MFS unit is fitted with one (128 or 256) modulating damper.

Each MFS unit is fitted with one (128) or two (256) variable speed fans.

Each MFS unit is fitted with a water heating coil (if specified). The controller, utilising the sensors and input signals adjusts the MFS unit

fan, heater coil valve (if fitted, and by others) and damper to manage the room temperatures and CO2 levels within the room.

A customer Modbus communication interface (if used) to BMS is

utilised to provide time switch, morning warm up time switch, and

outside air temperature inputs to the control system. Modbus also

allows data logging and operation interrogation remotely.

There are also alternative standalone strategies available using a BMS

timeclock, the controller’s internal timeclock and Gilberts supplied

outside air temperature sensors and boosters.

The below wiring schematic indicates a typical set up. Please contact

our Technical Department for more in-depth descriptions of operation,

full wiring diagrams, user instructions and Modbus interface details for

your specific strategy.

25


General MFS Classroom Detailed Schematic

��

��

��

� ��

��

��

��

��

��

��

��

��

��

��

� ��

��

��

� ��

��

��

� ��

��

��

��

��

� ��

� ��

��

��

� ��

� ��

��

��

��

� ��

��

��

� ��

��

��

� ��

��

MISTRALE FUSION TURRET

SERIES MFS-VRoof Mounted Hybrid Ventilation

27


MFS-V Roof Mounted Hybrid Solution

The MFS-V provides a roof top hybrid natural ventilation solution.

Perfect for internal zones such as auditoriums or other areas where

sidewall solutions may be problematic such as sports halls.

The solution is designed to comply with the design guidance

prescribed in Department of Education’s Guidance on Ventilation,

thermal comfort and indoor air quality in schools and the Latest

BB93 Department for Education Acoustic Performance Standards

for schools

A penthouse turret on the roof builds onto a vertical sleeve which

terminates with an air distribution plenum inside the space. The

terminal uses natural air buoyancy with low power fan assistance

to deliver a steady supply of fresh air from whilst allowing it to blend

controlled amounts of mixed extract air for heat recovery.

So, MFS-V is a dynamic hybrid that includes an ultra low power fan

assistance feature able to energise in poor air movement conditions

to ensure adequate ventilation at all times. The fan is there to

provide only occasional support ensuring that the terminal operates

to provide design heat recovery and ventilation requirements.

And it is truly energy efficient. With a design consumption of just 34kw per year per classroom Mistrale MFS-V costs less than £5* per

classroom per year yet guarantees full operational ventilation and

cooling efficiency.

Unlike other designs, Mistrale MFS is a stand alone system

providing adequate ventilation and cooling without the need for

supportive systems such as opening windows although it can still

be integrated with other heating, cooling or ventilation strategy if

required.

Features

• Energy efficient ventilation solution

• Compliant with DFE guidance on ventilation

• Accurate air and temperature control with free cooling and heat

recovery

• Full summer evacuation mode with fan boost to meet all BB101

and PBSP overheat requirements

• Includes CO2 override to meet current DFE guidelines

• Operator overrides with easily adjustable set points

• Clear indication of control strategy for users/occupants

• Low noise operation to meet current DFE guidelines (BB93)

• No ductwork requirement and maintenance free

In detail the MFS-V comprises of 2 no MFS 128 modules (see

page 6) discreetly housed in an internal outlet duct and attractively

finished on the roof with a choice of different turret styles.

The duct penetrates through the roof and terminates in the space

either through an air grille (numerous design choices) or a plenum

fitted with multiple air grilles. Roof depths of up to 1670mm can be accommodated as standard

Available in 2 sizes (900 and 1400mm) access to the fans

and dampers are available in the event of any adjustment or

maintenance requirements. Three different kerb sizes are also

available to cover the widest of upstands.

MFS-V can also even have a heating coil option fitted for initial heating of the classroom and maintaining room temperature in cold

weather.

Air volumes, noise levels and acoustic performance are identical to

the MFS256 series.

Controls

Single units are controlled in the same way that the MFS128 AND

MFS256 are controlled, utilising the Mistrale Control Unit (MCU).

Multiple units all act as slaves to a larger wall mounted panel that is

suitable for placement in a store room or similar, with Temperature/

CO2 sensors in the occupied zone.

The MFS is a stand alone system that does not rely on any supportive

systems such as opening windows (though the solution will work with

these) the low cost fan energy consumption ensure that the benefits derived far outweigh the low energy running costs.

Where natural ventilation is the design ethos Mistrale MFS is a purpose

designed solution specifically tailored and engineered as a full natural ventilation alternative. Modular in design it will fit easily and conveniently into the building structure

For selection and technical assistance please contact our Natural ventilation team

The new MFS Fusion terminal offers an alternative departure from traditional full natural ventilation solutions. Its hybrid mode of operation provides all of the benefits of natural ventilation but with the added advantages of both heat recovery and guaranteed air movement performance.

GILBERTS

The Air Movement

Specialists… since 1960

Head Office and WorksGILBERTS (BLACKPOOL) LTD

Gilair Works, Clifton Road,

Blackpool, Lancashire, FY4 4QT.

Telephone: (01253) 766911Fax: (01253) 767941e-mail: [email protected]

Web: www.gilbertsblackpool.com

Gilberts (Blackpool) Ltd reserve the right to alter the specification without notice. For our latest product data please visit www.gilbertsblackpool.com.

The information contained in this leaflet is correct at time of going to press © 2019.

mistrale fusion - gilberts blackpool · 2020. 7. 20. · or 256 (high capacity) litres per sec of...

Documents