Design standards of air conditioning systems for clean rooms

As you know how clean rooms are and requirements for design of air conditioning systems in clean rooms from the article:

I introduce to you some standards when designing air-conditioning systems for clean rooms and hospitals.

I. Some design standards for air-conditioning systems for clean rooms:

Currently in the world there are quite a few International Standards defining "Clean rooms" & air conditioning systems. Areas related to clean rooms & air-conditioning such as Biology, Pharmaceuticals, Microelectronics, Hospitals, Medicine and many more. The important standards that apply to clean rooms are as follows:

- Vietnam standard:

* TCVN 4088 - 1985: Climate data used in construction design.

* TCVN 5687 - 1992: Ventilation, air conditioning, heating - Design standards.

* TCVN 2622 - 1995: Fire prevention and fighting for houses and buildings - Design standards.

– ASHRAE Standards:

* 2000 - HVAC Systems and Equipment

* 1999 - HVAC Applications

* 1998 - Refrigeration

* 1997 - Fundamentals

Australian Standard:

* AS 1668 - Part 1 - 1998: The use of ventilation and airconditioning in buildings - Fire and smoke control

* AS 1668 - Part 3 - 2001: The use of ventilation and airconditioning in buildings - Smoke control systems1. US Federal Std 209E 1992

- And some other standards:

* EEC cGMP 1989

* France AFNOR 1989

* German VDI 2083 1990

* Hospital HVAC Design: A Challenge for IAQ, Energy Recovery and System Reliability

II. Design parameters of air-conditioning systems for operating rooms and sterilization zones:

Area	Cleanness	Noise level (N / C)	Fresh wind (times / hour)	Number of wind exchanges (times / hour)	Room temperature (0C)	Humidity (%)
Operating room	10,000	30	100%	20 – 40	23 ± 2	50
Primary room	100,000	30	30%	25	23 ± 2	50
Surgery corridor	100,000	30	2 ÷ 3	6	23 ± 5	–
Pasteurization area	1,000,000	30	1	2	23 ± 5	–
Recovery	1,000,000	30	1	2	23 ± 2	50
ICU, CCU	1,000,000	30	1	2	23 ± 2	50

III. A rough description of the air conditioning system for operating rooms:

1. Air conditioning systems are divided into 02 types:

- The central air conditioning system (Chiller - AHU) uses cold water to cool the air and separate the moisture from the air.

- The local air-conditioning system (1 outdoor unit + 1 indoor unit) uses gas to cool the air and separate the air from moisture.

2. Purpose:

Used to regulate the air state (temperature, humidity), cleanliness, pressure to suit each area in the hospital.

3. Due to the special requirements of the operating room with the air conditioning system, it is necessary to ensure the following parameters:

- Temperature: 23 ± 2 ° C

- Humidity: 50 ± 5%

- Cleanness:

Cleanliness class 10,000: for large operating rooms

Cleanliness class 100,000: for the primary rooms and clean corridors

- Create positive pressure to prevent contamination from neighboring rooms Air treatment equipment AHU, FCU will treat the air to temperature, humidity, then use high standard air filters (H13- H14) to filter dust to meet the requirements of cleanliness and air exchange times for operating rooms.

Note:

- An operating room with class 10,000 cleanliness, satellites such as instrument washing, postoperative rooms and clean corridors must have a clean grade less than 01 class 100,000 to ensure the principle of cleanliness.