Cleanroom Ventilation System Operating Theatre
AC Installation Services

Information

Hospital operating rooms can be classified as cleanrooms, but their main function is to restrict certain types of contamination rather than the quantity of particles are located. Cleanrooms are used in patient isolation and surgery where infection risks exist.

An isolation chamber is built to minimize particle migration from isolation spaces to other areas of health care facilities. The risk of getting infected through the airways is a function of particle concentration. The possibility of particles carrying the organism falls on the patient being treated. By reducing the concentration of particles aimed at reducing the likelihood of infection, therefore, the number of infected patients. And prevent new diseases that arise.
First, the concentration of particles will tend to increase with the rate of production of particles indoors.
Second, the proportion of air supply and the quantity of air exhaust is related to the size of the room.
Third, the level of air filtration provided will affect the ability of the ventilation system to reduce the concentric and particle space
Fourth, air turbulence and indoor air movement can transport particles so that air distribution methods will affect local concentration levels.
The four main factors that affect the concentration around a person in a room: These last three are attributes of a ventilation system that can be engineered to limit the first effect. Recommendations for control engineering to contain or prevent the spread of an airborne contaminant center on:
1. Air vent
2. Air Filter or Air Purifier (primary and secondary filtration)
3. Exhaust air vent

AIR VENTILATION
The most effective way to control contaminants, odors and indoor air pollution is through ventilation, which requires simultaneous control with several conditions:
1. Air exchange
2. The pressure of the room is adjusted to the isolation class
3. Appropriate air distribution is conditioned by cooling the air conditioner
4. High quality of air filtration system is needed
5. Appropriate temperature and humidity controls ensure maintenance according to climate

Air Exchange
Supply Provisions Ventilation for health facilities requires a large amount of fresh air to dilute and eliminate contaminants generated in space and there are some spaces that do not require air behind. The level of ventilation for a health facility that states as air hourly air changes (ACH), which is a measure of how quickly the air in the interior space is replaced with outside (or air conditioned) air.

For example, if the amount of air entering and leaving in an hour equals the total volume of space, the space is said to have an air change per hour. Airflow rates are measured in suitable units such as cubic feet per minute (CFM) and provided by:

In this equation,
Q is the calculated air volume flow rate, and ACH is the number of hourly air changes. To determine the airflow required for adequate area ventilation,
Calculate the volume of space for ventilation Width x Length x Height = ft3 (cubic feet).
Calculate the air volume requirement by multiplying the volume of space by the rate of air exchange per hour = ft3 / hour.
Study done. shows that only one air change with fresh air can remove 63% of the particles from the room air. If the ventilation system can perform 10 air changes per hour (ACH), it takes 14 minutes to remove 90% of air contaminants in space and 28 minutes to remove 99%. Thus an increase in the amount of fresh air changes per hour is effective for cleaning air contaminants. However, the higher the air exchange rate (> 20 ACH) can cause turbulence and the cost for self-ventilation will be too high. Therefore, a recommended 12 ACH proposed compromise is to be achieved when the filter has reached the maximum pressure drop. High ACH is also equal to the energy usage required.
The selection of 12 air exchange per hour is largely a matter of convention. The level of ventilation is changing unless there is a provision on a government or local set standards in the health license terms. These standards usually apply only to the design of facilities, rather than to operations. Based on knowledge and professional scientific judgments reflected in the AIA guidelines, ASHRAE and the American National Standards Institute (ANSI) have developed design recommendations for ventilation and relationship pressure for various patient care sites. Health facilities without special ventilatory standards should follow ANSI / ASHRAE Standard 62, Ventilation for Acceptable Indoor Air Quality or in the absence of supply / hour changes following certain air guidelines can be used:
For air-pressure space under negative pressure. Air exhaust 10 to 15 percent more than air supply.
For space for air pressure under positive pressure, air exhaust is 10 to 15 percent less than air supply.

ROOM PRESSURE CONTROL
Building pressurized space is an important factor for monitoring in hospitals as it can greatly affect control of the hospital room. If air pressure can allow the building to become negative due to the supply of filters used, the Air Supply goes too slow, or Air Return goes too fast, humidity and air impurities can be pulled into the building through cracks and crevices.

The pressure of the building space is achieved by controlling the quality and quantity of air supply and air exhaust, keeping the air pressure difference between adjacent areas, and designing airflow patterns for specific clinical purposes.

For a more complete explanation of your hospital's HVAC requirements, please consult with us via 081361689837 (whatsapp)

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