surgical room air conditioners

SURGICAL ROOM AIR CONDITIONERS

The air conditioning system for surgical rooms

must assure a

“high air quality”.

To get it the following

“six goals”must be achieved:

First goal

Elimination or minimization

of the chemical contamination

due to the anestetical gas

Second goal

Elimination of the

batteriological contamination coming from the external

environement (through fresh air).

Third goal

Elimination of the

batteriological contamination coming from

the surrounding environments

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

Fifth goal

Guaranty a good level

of control of temperature

and humidity

Sixth goal

Obtain the first 5 goals guarantiing

the maximum

energy saving

The air conditioning system for surgical rooms must assure a “high air quality”.

Chemical contamination cannot be filtered; the only solution is the dilution with a great quantity of fresh air.

First goal:




First goal:




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:

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

Double fan for supplying and expelling air

for the maximum functionment

security. (Accessory)

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.

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.


about the second goal

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.



Direct expansion surgical room air

conditioner

MODEL OHA 132/R407

AIR FLOW: 4.400 m3/h

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



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.

Third goal



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.

Third goal



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.

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.


about the third goal

Mounting within the room

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.

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.

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

Sixth goal


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?

Sixth goal


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?

CHILLED WATER SURGICAL ROOM AIR

CONDITIONER

WITH HEAT RECOVERY SYSTEM

MODEL OHU 208

AIR FLOW: 6.900 m3/h

DIF-O.T. CEILING FILTRATION SYSTEM

Thank you