SURGICAL ROOM AIR CONDITIONERS
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Transcript of SURGICAL ROOM AIR CONDITIONERS
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SURGICAL ROOM AIR CONDITIONERS
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SURGICAL ROOM AIR CONDITIONERS
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The air conditioning system for surgical rooms
must assure a
“high air quality”.
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To get it the following
“six goals”must be achieved:
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First goal
Elimination or minimization
of the chemical contamination
due to the anestetical gas
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Second goal
Elimination of the
batteriological contamination coming from the external
environement (through fresh air).
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Third goal
Elimination of the
batteriological contamination coming from
the surrounding environments
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Fourth goal
Reduction of the
batteriological pollution due to the
surgical team or to
the patient himself
Fourth goal
Reduction of the
batteriologicalcontamination
due to the surgical team
or to the patient himself
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Fifth goal
Guaranty a good level
of control of temperature
and humidity
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Sixth goal
Obtain the first 5 goals guarantiing
the maximum
energy saving
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The air conditioning system for surgical rooms must assure a “high air quality”.
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Chemical contamination cannot be filtered; the only solution is the dilution with a great quantity of fresh air.
First goal:
Elimination or minimization
of the chemical contamination
due to the anestetical gas
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First goal:
Elimination or minimization
of the chemical contamination
due to the anestetical gas
How great?
In Italy 15 volumes per hour
In Germany
In Switzerland
1.200 m3/per hour
800 m3/per hour
This depends by the local Standard:
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The fresh air flow must be constant in time even if the filters become dirty and
therefore raise there pressure drop.
Within the unit an air flow measurer is therefore foreseen to informs the microprocessor of the reduction. The microprocessor raises through the inverter the number of revolution of the fan so to get the set air flow.
Technical considerations
about the first goal
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Double fan for supplying and expelling air
for the maximum functionment
security. (Accessory)
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Second goal
Eliminationg of the batteriological pollution from the external
environement (through fresh air).
The batteriological pollution coming from outside is eliminated through the absolute filters to be fitetd at the end of the supply ducts: H12 for general surgery, and H14 for orthopedics and more delicate operations.
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The absolute filter must be the last component of the aeraulic circuit since everything between it and the patient can contaminate the treated air.
The absolute filter is therefore installed in the surgical room immediately above the operating bed.
Technical considerations
about the second goal
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The EN10339 Standard , for the duration in time of the fresh air filters, foresees that before an absolute filter another F9 fine filter be installed and before this a G4 filter.
Technical considerations
about the second goal
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Direct expansion surgical room air
conditioner
MODEL OHA 132/R407
AIR FLOW: 4.400 m3/h
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The blocking device of the filter on its gasket must guaranty that the air cannot by-pass the filter itself. The good efficency of the filtrating section must be guarantied and not only of the filter according to the EN 1886 Standard
Technical considerations
about the second goal
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Third goal
Elimination of the batteriological
contamination from the surrounding environments
The batteriological contamination coming from the surrounding environments is eliminated by mantaining the room is overpressure respect to them.
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Third goal
Elimination of the batteriological
contamination from the surrounding environments
To mantain an environment in over/underpressure in respect to a reference one it is sufficient to extract more or less air than the one supplyed in.
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Third goal
Elimination of the batteriological
contamination from the surrounding environments
The opposite is true in case of septic or dirty operations; the surgical room must be mantained in depression so not to pollute the surrounding environements.
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A differential pressure pressostat mounted between the surgical room and the clean corridor informs the microprocessor of the situation of over/underpressure in the room. The microprocessor then confronts this with the desired situation and acts on the exaust fan inverter raising or reducing the quantity of the expelled air from the environment.
Technical considerations
about the third goal
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Mounting within the room
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Fourth goal
Reduction of the batteriological
pollution due to the surgical team
or to the patient himself
The endogenous batteriological pollution from the patient or from the surgical team is eliminated by filtering with absolute filters as frequently as possible the treated air.
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Fifth goal
Guaranty a good level of control of
temperature and humidity
How is it done?
With treatment sections that guaranty the high quantity of fresh air throught thermodynamic components both for the control of humidity and temperature with modulating capacity control.
Even in the case of direct expansion units the frigorific capacity is modulated
by an electronic injection of hot gas.
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Sixth goal
Guaranty the maximum
energy saving
How is it done?
Raising as much as possible the recirculation: obviously in respect to the local Standard
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Sixth goal
Guaranty the maximum
energy saving
Night Stand-by of the units, activable from the presence feelers, BMS, hour timetables or manualy:
1: Reducion of the capacity by 1/3 of theal fffffffnominal one, external one
2: Mantaining the overpressure
3: Raising the dead range from 0,3 ° to 10 °
How is it done?
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Sixth goal
Guaranty the maximum
energy saving
In case of no recirculation: Local Standards or septic environemnts to be mantained in depression a heat recovery system must be foreseen.
How is it done?
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CHILLED WATER SURGICAL ROOM AIR
CONDITIONER
WITH HEAT RECOVERY SYSTEM
MODEL OHU 208
AIR FLOW: 6.900 m3/h
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DIF-O.T. CEILING FILTRATION SYSTEM
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DIF-O.T. CEILING FILTRATION SYSTEM
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Thank you