Chilled Beam in a Healthcare Environment

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Chilled Beam in a Healthcare Environment
Andrew Clarke Halton Products Ltd
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Content

• Typical Installations
• Chilled Beam Operation
• Cooling
• Heating
• Patient Benefits
• User Benefits
• Projects Testament

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BT Sovereign Street - Leeds
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Roche HQ Welwyn
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Sandwell Hospital Emergency Services Centre
Resuscitation Ward
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Sandwell Hospital Emergency Assessment Ward
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Content

• Typical Installations
• Chilled Beam Operation
• Cooling
• Heating
• Patient Benefits
• User Benefits
• Projects Testament

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Chilled Beam Types Passive
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Chilled Beam Types Active - Exposed
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Chilled Beam Types Active - Recessed
DRY OPERATION!!
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Active Chilled Beam Installation
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UCLH - London
Patient Ward
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Content

• Typical Installations
• Chilled Beam Operation
• Cooling
• Heating
• Patient Benefits
• User Benefits
• Projects Testament

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1 Bed Ward 50W/m2. MFA48l/s
Ward Area 4.8m x 4.1m 19.7m2 Sensible cooling
requirement 984W
Room Condition 25?C/50RH RDP 14?C CHW
15?C Primary Air Temp 18?C
Number of beams 1 x 1800mm CHW flowrate
0.062kg/s Output (400W air 584W water)
984W Return temperature 17.2?C PD 2.4KPa
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1 Bed Ward
Supply volume (Peak MFA) 48l/s
Airside PD 101Pa 32dB(A) NR28
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1 Bed Ward _at_ 24l/s MFA
Design Sensible 984W Less 2 x occupant gain _at_
70W each 844W CIBSE Guide.
25?C seated at rest
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1 Bed Ward
MFA (no visitors) 24l/s
Airside PD 101Pa 25dB(A) NR20
(NR28 _at_ 48l/s)
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Motorized HAQ for CHC
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4 Bed Ward
Area to be conditioned Approximately
70m2 Typical cooling requirement 3290W (47W/m2)
Number of beams 2 off Beam length 3000mm CW
flowrate 0.1kg/s/beam Output 2 x (600W air
1046W water) 2 x 1646W/beam 3292W
V3 ? 0.25m/s
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Comfort Conditions
Recommendations Thermal comfort is determined by
the temperature gradient in the space and room
air velocities. Based on EN ISO 7730 the
following recommendations can be given for light
sedentary work (PMV 0, PPD 5)
Air velocity and operative temperatures (to avoid
draughts) Winter lt 0.15 m/s _at_ 22ºC /-
2ºC Summer lt 0.25 m/s _at_ 24.5ºC /-
1.5ºC Vertical air temperature difference lt 3ºC
from feet to head, 0.1m to 1.1m (seated) Radiant
temperature asymmetry Winter lt 10ºC from cold
vertical surfaces lt 5ºC from warm
(heated) ceiling
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Comfort Conditions
The human response to the thermal environment is
expressed by the predicted mean vote (PMV) and
the predicted percentage dissatisfied (PPD)
indicies of EN ISO 7730. These predict the
percentage of occupants generally feeling too hot
or too cold. PMV is based on the heat balance of
the human body. Man is in thermal balance when
the internal heat production is equal to the heat
loss.
Draught, abnormally high vertical temperature
difference, hot/cold floor temperatures, or high
asymmetric radiant temperature may cause such
discomfort.
The PMV index predicts the mean vote of the
thermal sensation census of a large group of
people on the following 7 point scale 3
hot 2 warm 1 slightly warm 0 neutral -1
slightly cold -2 cool -3 cold
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Condensation Must be Prevented

• Sufficiently high inlet water temperature
• Employ dew-point sensor
• Dehumidification of primary air
• Insulate valves and pipes

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Content

• Typical Installations
• Chilled Beam Operation
• Cooling
• Heating
• Patient Benefits
• User Benefits
• Projects Testament

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1 Bed Ward HEATING
Room condition 21?C LTHW 45?C/35?C Primary Air
Temp 18?C
LTHW flowrate 0.014kg/s Airside duty
-87W Waterside duty 569W Beam Htg 482W
(24W/m2)
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Content

• Typical Installations
• Chilled Beam Operation
• Cooling
• Heating
• Patient Benefits
• User Benefits
• Projects Testament

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Sandwell Hospital Ward Space Temperature (Clg)
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Sandwell Hospital Ward Space Temperature (Htg)
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Halton Velocity Control (HVC)
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Environmental Benefits
Energy Efficiency
Desired Air Temperature, and Velocity
Good Air Quality
Low Sound Level
Draught-free Conditions
Low Temperature Gradient
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Content

• Typical Installations
• Chilled Beam Operation
• Cooling
• Heating
• Patient Benefits
• User Benefits
• Projects Testament

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Chilled Beam Maintenance

• No Moving Parts
• Sensible i.e. Dry Cooling
• No Filter
• De-Mountable Coil Option Available

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De-Mountable Coil Option
Valve Option
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Energy Saving Opportunities with HAQ
Consider 1 Bed Ward Peak Design MFA
48l/s Minimum Design MFA 24l/s
Applying the The Fan Laws we have N¹/N²
V¹/V² (N¹/N²)² P¹/P² (N¹/N²)³ W¹/W²
(48/24)³ W¹/W² Therefore W² W¹/ (48/24)³
W¹/8 0.25 W¹
Hence, reduction in fan power consumption 75
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Chiller Summer Operation
FreeCooling
Chiller Winter Operation
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DB Ambient of 10 ºC or less
46.96
                 
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GSHP

• Closed Loop
• Vertical boreholes or horizontal trenches
• ? 3m, ground temperature approx 10 ?C
• COP Approx 3 to 4
• Available Grant?

• Open Loop
• Extract groundwater at typically 10?C, pass
  through a PHE and return to aquifer
• SYSTEM water leaves PHE _at_ approx 14?C, ideal for
  chilled beam
• Remove need for chiller
• NB Chiller/DX still required for 1y Air cooling
  and de-hum.

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Content

• Typical Installations
• Chilled Beam Operation
• Cooling
• Heating
• Patient Benefits
• User Benefits
• Projects Testament

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Sandwell Hospital AE Patient,
Resuscitation Emergency Wards George Elliot
Hospital Clinical Skills Resuscitation
Skills Labs and Seminar Rooms St Jamess IOMM,
Leeds Primary/Microbiology/Imaging/Microscopy
Labs UCLH Single 4 Bed Patient Wards and
Consulting Rooms Royal London Pathology and
Pharmacy Labs Tameside Hospital Microbiology
Las Seminar Rooms Pontefract Pinderfields
Single 4 Bed Wards Great Ormond Street
Hospital Corridors and Single/Multi Bed Wards
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Use technologies that enable the use of
sustainable low energy cooling- displacement
ventilation- chilled ceilings- chilled
beamsSource Sustainable low energy cooling
an overviewCIBSE Knowledge Series, 2005
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Chilled beams 2.43 The use of chilled beams
for the provision of heating, cooling and
ventilation is increasingly common in healthcare
premises. 2.44 Active chilled beams providing
tempered, filtered air to the room can provide
effective local control of environmental
conditions. 2.45 Care should be taken in
positioning chilled beams to ensure that cold
draughts are avoided, particularly when used in
the cooling mode. The control settings should
ensure that the external elements of the beam are
always above dew-point. Manufacturers of these
devices are able to provide specific advice on
the siting and design limits of their
equipment. 2.46 Chilled beam units should be
easily accessible for cleaning and maintenance.
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Testament
Our experience with the operation of Chilled
Beams is as follows The Trust has chilled beams
installed in a number of areas ranging
from waiting rooms to ward environments in its
Emergency Services Centre. To date we have been
very pleased with the operation of these units
both from an environmental control and noise
point of view. Clearly both of these issues are
paramount in achieving a good patient
experience. My experience of the operation of the
Chilled beams is that they are virtually silent
in operation and compare well if not better than
more traditional forms of ventilation / air
conditioning.
Kevin Reynolds Deputy Head of Estates
(Operational) Sandwell West Birmingham
Hospitals NHS Trust
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ANY QUESTIONS?