《办公建筑应对“新型冠状病毒”的运行管理应急措施指南》英文版.pdf

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Standard of the Architectural Society of China T/ASC 08-2020 Guidelines for emergency operation and management of office buildings for dealing with “novel coronavirus” 办公建 筑应 对“新型 冠状 病毒” 运行 管理应 急 措施 指南 English Translation Issue date 2020-02-04 Implementation date 2020-02-05 Issued by the Architectural Society of China Standard of the Architectural Society of China Guidelines for emergency operation and management of office buildings for dealing with “novel coronavirus” T/ASC 08-2020 Developed by China Construction Technology Group Corporation Limited Approved by Architectural Society of China Implementation Date February 05, 2020 2020 Beijing Contents Foreword ii 1 General provisions . 1 2 Ventilation and air conditioning 2 2.1 Ventilation and air conditioning system . 2 2.2 Air treatment and hot/chilled and condensing water system . 6 3 Water supply and drainage system 7 3.1 Water sealing, water trap, and floor drain in drainage system 7 3.2 Water quality assurance 9 3.3 Centralized hot water supply system . 9 3.4 Reclaimed water treatment station 10 3.5 System maintenance . 10 4 System cleaning and cleaning disinfection 11 4.1 System cleaning. 11 4.2 Cleaning disinfection 12 5 Garbage collection and temporary storage 14 Explanation of wording in the Guidelines 15 List of quoted standard 16 i Notification on Publishing T/ASC Standard Guidelines for emergency operation and management of office buildings for dealing with “novel coronavirus” Guidelines for emergency operation and management of office buildings for dealing with “novel coronavirus” has been approved as a standard of the Architectural Society of China with a serial number of T/ASC 08-2020, and shall be implemented as of February 5, 2020. Architectural Society of China February 04, 2020 ii Foreword The Architectural Society of China is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. The present stage is critical for the prevention and control of the “novel coronavirus” epidemic. In order to implement the decisions and arrangements of the Central Government, the epidemic prevention and control shall be taken as the top priority at the moment. Under the circumstances that the epidemic situation has not been fully and effectively controlled and that the Chinese New Year holidays are coming to the end, the drafting group has developed the Guidelines through careful summarization of practical experiences from SARS prevention and control and on the basis of widely soliciting for opinions, with aims to ensuring the scientific and normal use of people-intensive office buildings after the holidays, preventing further spread of “novel coronavirus“ due to the concentration of people and improper use of electric and mechanical systems in the buildings, and protecting the health of office building users. The Guidelines consists of 5 clauses 1. General provisions; 2. Ventilation and air conditioning; 3. Water supply and drainage system; 4. System cleaning and cleaning disinfection; and 5. Garbage collection and temporary storage. China Construction Technology Group Corporation Limited CCTC is responsible for the explanation of specific technical contents of the Guidelines. In case of any comment or suggestion during the implementation of the Guidelines, please contact CCTC Address No.36, Deshengmenwai Street, Xicheng District, Beijing, 100210, China; Contact Zhao Li, Tel. 86-10-88328008, Email zhaolcadg.cn. Developed by China Construction Technology Group Corporation Limited Participated with China Architecture Design 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 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 “fan-coil units, independent air-conditioning units, etc. fresh air“ system 1 The air conditioning system may be operated normally as usual, and all the fresh air systems shall be operated with the maximum fresh air volume. 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 occupants 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 adopting control sequence that when exterior windows opens the corresponding air-conditioning terminals will be shut off automatically for energy conservation or other purposes, it is recommended to disable this control sequence until the end of this epidemic; 2 For air-conditioned rooms without exterior windows and exhaust systems , the following provisions shall be followed 1 Ventilator with heat recovery may be adopted to meet the ventilation requirements of the room; ventilator with such heat recovery device that fresh air and exhaust air is isolated should be adopted, e.g., heat pipe or plate heat exchanger, etc.; rotary heat recovery equipment shall not be used at present; “mass transfer” heat recovery equipment e.g., patent heat recovery device is not recommended for use either, since the protection capability of these kinds of equipment against the virus cannot be confirmed at present; 2 For buildings with each office room equipped with centralized fresh air system and each floor’s toilets and 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 3 ① Unless for special reasons, it is recommended that during occupancy, 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 exhausted through the walkway; ② For air-conditioned rooms that need to be relatively closed while 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 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 the floor, otherwise, the exhaust air system should be appropriately reformed by replacing exhaust fan, etc.. 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 install new exhaust systems and put them into operation; on the premise of taking effective measures to assure the safeness of smoke exhaust system and obtaining the consent of the competent fire-fighting administrative department, it may also be considered to exhaust air in a centralized way by virtue of the fire-fighting smoke exhaust system. 3 If a fan-coil unit serves more than one room this kind of situation may occur in part area of a building, the operation of such fan-coil unit shall be suspended or the unit shall be appropriately reformed so that it only serves a main room; 4 Once a “suspected case of novel coronavirus infection” is found in a building, all the on-site convective cooling/heating terminal such as fan-coil unit and indoor unit of independent air-conditioning unit should be shut down; 5 For severe cold and cold zone and some of the hot-summer and cold-winter zone where heating supply is still required for a period of time after the Chinese New Year holidays, the set point 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 effectively, or the hot water valve of the fresh air handling unit shall be manually opened fully for buildings without an effective air-conditioning system, so that the fresh air can undertake the heating load of the building as much as possible. If cooling is required for the buildings for example, in Hainan Province, etc., the set point of the outlet air temperature of the fresh air handling unit shall be as lower as possible or the cold water valve of the fresh air handling unit shall be manually opened fully, so that the fresh air can undertake the cooling load of the building as much as possible. 4 2.1.3 The following measures are recommended for air conditioned areas serving by VAV/CAV systems 1 If the air-conditioning system only serves one room, it can be operated as usual; under the premise that indoor temperature could be controlled not lower than 16℃18℃ an on-site test can be conducted to determine whether the indoor temperature variation is acceptable or not, following measures to increase fresh air volume are recommended 1 For single-fan system make sure that the fresh air valve is fully opened, and reduce the return-air valve opening or shut off the return-air valve; 2 For system with supply fan and return or exhaust fan open or fully open the fresh air valve and exhaust valve while reducing the return-air valve opening or shutting off the return-air valve; 3 In hot summer and warm winter zone, air-conditioning system may operate in whole fresh air mode by fully closing return-air valve during the period from the end of the holidays to the day cooling is needed; 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 set point of room temperature or the control method of the hot/chilled 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 canteen and kitchen areas 1 For canteen, food delivering area and dining area shall be partitioned for example, using transparent plates to properly separate the diners in the dining area from the staffs in the kitchen and in the food delivering area. The isolation height shall be 1.3m2.0m the respiratory affected space of human being; 5 2 For zones seriously affected by the epidemic, the canteen shall be completely isolated from the kitchen, and measures shall be taken to prevent the air in the canteen from flowing into the kitchen. At this time, when vent hood exhaust fan 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 air; 3 For canteens 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 employees eat packed meal instead of eat in canteen. 2.1.5 The following measures are recommended for ventilating area 1 In order to improve the indoor air quality of the building, VAV/CAV system, all-air system and exhaust system with their return-air valve closed including the systems where fire-fighting smoke exhaust is temporarily converted into air exhaust can be properly put into operation 1d3d before the building running for early ventilation; however, for severe cold and cold zone, it is necessary to pay attention to the operation time to ensure that the room temperature is not lower than 5℃8 ℃ when the building is unoccupied; 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 not lower than 5℃8 ℃; 3 All exhaust systems for toilets and soiled articles disposal rooms shall be put into operation all the time to ensure that the air pressure difference between these rooms and the area beyond these areas 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; 6 5 Ventilation shall be enhanced in the drinking water tank room and the direct drinking water treatment room. 2.2 Air treatment and hot/chilled and condensing water system 2.2.1 The fresh air and all makeup air of the building shall be taken directly from the a clean place ,outside air shall be introduced from outside air inlets to air handling units or fans by duct other than air handling units or fans take fresh air indirectly e.g. from mechanical room. 2.2.2 “Disinfection via chemical disinfectant” shall not be adopted for air conditioned rooms, air conditioning duct systems and air conditioning mechanical rooms; without exact evidence or the opinions from the medical experts, it is currently not appropriate to install ultraviolet lamps in air-conditioning system and ventilation system. 2.2.3 If possible, for buildings with heating requirements, the hot water temperature of the air handling unit and air conditioning units shall be increased as much as possible to reduce the impact on room temperature caused by the increased fresh air volume; for buildings with cooling requirements, the supply chilled water temperature set point shall be reduced to 5℃6 ℃. 2.2.4 During working hours, the indoor air-cleaning devices shall be put into operation. 7 3 Water supply and drainage system 3.1 Water sealing, water trap, and floor drain in drainage system 3.1.1 For the connection of water apparatus and the
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