1 General provisions
1.0.1 The Guidelines are developed to guiding the emergency operation and management of office buildings for dealing with the prevention and control of “novel coronavirus” epidemic.
1.0.2 During the epidemic prevention and control period, in order to prevent further spread of "novel coronavirus" caused by the concentration of people and the improper use of electromechanical systems in the buildings, the running of electromechanical systems shall place top priority to ensure the health and safety of indoor people, and take into considerations the energy-efficient and environmentally-friendly requirements.
1.0.3 The Guidelines is applicable to the emergency measures taken by office buildings to deal with the “novel coronavirus”, covering air-conditioned areas (adopting "cooling/heating terminal + fresh air" system or all-air-conditioning system), dining room and kitchen ventilation system, and air treatment and air-conditioning water system; building water supply and drainage system; system cleaning and cleaning disinfection; and domestic garbage collection and temporary storage.
1.0.4 The emergency operation and management of the office buildings in “novel coronavirus” prevention and control period shall meet the requirements specified in both the Guidelines and the current relevant standards of the nation.
2 Ventilation and air conditioning
2.1 Ventilation and air conditioning system
2.1.1 The office building should give priority to increasing the ventilation volume of fresh air as one of the most effective prevention measures. Various measures should be taken according to the forms of air conditioning systems in the office buildings.
2.1.2 The following measures are recommended for the air-conditioned areas adopting the "cooling/heating terminal + fresh air" system:
1 The air conditioning system may be operated normally as designed, and all the fresh air systems shall be operated normally;
2 In order to ensure that fresh air can be effectively delivered to each air-conditioned room and make the fresh air volume for the inside people meet the requirements specified in the current national standard GB 50736 Design code for heating ventilation and air conditioning of civil buildings, the following measures shall be taken depending on different air-conditioned rooms, respectively:
(1) For air-conditioned rooms with openable exterior windows, the exterior window shall be opened at a certain degree when using the air conditioning system; for buildings with magnetic interaction for both exterior windows and air conditioning windows for energy conservation or other purposes, it is recommended to close such interaction mode until the closing of this epidemic;
(2) For air-conditioned rooms without external windows, for which the exhaust system has not been arranged in the original design, the following provisions shall be followed:
1) Two-way energy-saving ventilator may be adopted to meet the ventilation requirements of the room; the fresh/return air heat exchanger of indirect heat exchange type shall be adopted (e.g., heat pipe type and aluminum foil plate fin type); rotary heat recovery equipment shall not be used at present; "mass transfer” heat recovery equipment (e.g., heat recovery device with "paper core" as the core) is not recommended for use either, since the protection capability of paper core against the virus cannot be confirmed at present;
2) For buildings with each office room equipped with centralized fresh air system and each floor (including toilets or walkways) equipped with centralized mechanical exhaust system, the exhaust system shall be put into operation, and two of the following ventilation modes may be adopted for each room:
① Unless for special reasons, it is recommended that during use, the room door be kept opening at a certain degree or a certain area of louvers be set on the room door so that the air of air-conditioned room can be exchanged with the walkway;
② For air-conditioned rooms that need to be relatively closed in use (such as some important meeting rooms and confidential rooms), it is recommended to set mechanical exhaust fans, with the exhaust air volume less than the fresh air volume of the room, on the partition wall between the room and the walkway, or to set exhaust ducts, with the cross-sectional area better greater than that of the fresh air duct of the room, directly leading to outdoors;
③ The total exhaust air volume of the centralized exhaust system on a floor shall not be less than 70% of the designed total fresh air supply volume of such floor, otherwise, the exhaust air system should be appropriately modified (by changing exhaust blower and other measures).
(3) If each office room is equipped with a centralized fresh air system but the walkway is not equipped with a centralized exhaust system, refer to Item (2) above to reasonably add mechanical exhaust systems and put them into operation; on the premise of taking effective measures and obtaining the consent of the competent fire-fighting department, it may also be considered to exhaust air in a centralized way by virtue of the fire-fighting exhaust system.
3 If a fan coil unit serves more than one room (at local positions in some buildings), the operation of such fan coil unit shall be suspended (or the unit shall be appropriately modified so that it only serves a main room);
4 Once a “suspected case of novel coronavirus infection” is found in the building, all the indoor convective cooling/heating terminals (such as fan coil unit and indoor units) should be stopped;
5 For severe cold and cold areas (and some of the hot-summer and cold-winter areas) where heating supply is still required for a period of time after the Chinese New Year holidays, the setting value of the outlet air temperature of the fresh air handling unit shall be increased as much as possible (for buildings in which the automatic air conditioning system operates normally), or the hot water valve of the fresh air handling unit shall be manually opened fully (for buildings without an automatic air conditioning system), so that the fresh air can bear the heating load of the building as much as possible. If cooling is required for the buildings (for example, in Hainan Island, etc.), the setting value of the outlet air temperature of the fresh air handling unit shall be reduced as much as possible (or the cold water valve of the fresh air handling unit shall be manually opened fully), so that the fresh air can bear the cooling load of the building as much as possible.
2.1.3 The following measures are recommended for air conditioned areas using all-air conditioning systems:
1 If the air conditioning system only serves one room, it can be operated normally as designed; under the premise that the indoor temperature is not seriously affected (i.e., the recommended room temperature is not lower than 16℃~18℃, and a short-term test can be conducted), the following measures to increase the fresh air volume of the system may also be adopted:
(1) Single-fan system: make sure that the fresh air valve is fully opened, and switch down (or off) the return-air valve;
(2) Double-fan system or single-fan system with mechanical exhaustion: open (or fully open) the fresh air valve and exhaust valve while switching down (or off) the return-air valve;
(3) In hot summer and warm winter areas, the return-air valve can be fully closed for all fresh air operation during the period from the end of the holidays to the day the cooling system is started; If possible, the exterior window shall be opened at the same time.
2 For areas seriously affected by the epidemic, or where the air conditioning systems serve more than one room, the return-air valve of the air conditioning system shall be fully closed, and the fresh air valve and exhaust valve shall be fully opened during the epidemic period;
3 The requirements for the setting value of room temperature or the operation mode of the hot-/cold-water valve are the same as those for the fresh air handling units, see 2.1.2, Item 5.
2.1.4 The following measures are recommended for dining hall and kitchen areas:
1 The areas inside and outside of the food-selling window shall be locally partitioned (for example, using transparent plates) to properly separate the diner in the dining hall from the staffs in the kitchen (and in the food selling area). The isolation height shall be 1.3m~2.0m (the respiratory range of human being);
2 For areas seriously affected by the epidemic, the dining hall shall be completely isolated from the kitchen, and measures shall be taken to prevent the air in the dining hall from flowing into the kitchen. At this time, when the oil smoke exhauster of the kitchen is in operation, other measures shall be taken to supplement the air, such as using mechanical makeup air or opening windows (or arranging air ducts) to introduce natural air make-up from outdoor;
3 For dining halls without mechanical ventilation measures or private rooms without openable windows, it is recommended to temporarily stop using them if they cannot be renovated;
4 The operations in the kitchen shall comply with the corresponding occupational management regulations; during the epidemic period, it is recommended that the dine way of the employees be changed in the method of “set meals” like fast food; and it is recommended to temporarily stop using large-scale staff canteens.
2.1.5 The following measures are recommended for areas with mechanical ventilation:
1 In order to optimize the indoor air quality of the building, the fresh air conditioning system, all-air system and exhaust system with their return-air valve closed (including the systems where fire-fighting exhausting is temporarily converted into air exhaust) can be properly put into operation 1d~3d before the work is resumed for early ventilation; however, for severe cold and cold areas, it is necessary to pay attention to the operation time to ensure that the room temperature is not lower than 5℃~8℃ when there is nobody in the room;
2 The ventilation and air conditioning systems in the building (including heating coils and centralized air conditioning and hot water systems) shall be started 1h before the working hours; after work, the operation of the ventilation and air conditioning systems shall be continued for 1h to 2h, and it shall be ensured that the room temperature is lower than 5℃~8℃;
3 All exhaust systems for toilets and soiled articles disposal rooms shall be put into operation to ensure that the air pressure difference between these rooms and the area where people normally stay is negative;
4 The ventilation system of the underground garage shall be put into normal operation according to the design requirements; in areas seriously affected by the epidemic, the daily operation time shall be extended;
5 Ventilation shall be increased in the drinking water tank room and the direct drinking water treatment room.
Foreword ii
1 General provisions
2 Ventilation and air conditioning
2.1 Ventilation and air conditioning system
2.2 Air treatment and air conditioning water system
3 Water supply and drainage system
3.1 Water sealing, water trap, and floor drain in drainage system
3.2 Water quality assurance
3.3 Centralized hot water supply system
3.4 Reclaimed water treatment station
3.5 System maintenance
4 System cleaning and cleaning disinfection
4.1 System cleaning
4.2 Cleaning disinfection
5 Garbage collection and temporary storage
Explanation of wording in the specification
List of quoted standard
