How to properly use central air conditioning during the epidemic Just read this one

How to properly use central air conditioning during the epidemic Just read this one

At the moment of the epidemic, is there a risk of cross-infection in central air conditioning? How do units reduce the risk of using central air-conditioning?

　　 Xu Wei: The prevention and control of the new crown pneumonia epidemic is currently the most important work. The correct operation of the air conditioning and ventilation system during the epidemic period of infectious diseases can effectively reduce the chance of cross infection. Due to the diverse types of buildings and the wide variety of central air conditioners, in an environment with the possibility of cross infection, three common suggestions can be made: First, use fresh air from the air conditioner to run as much as possible, increase the amount of fresh air, and open windows conditionally Open windows at regular intervals to ventilate, which helps prevent the spread of the epidemic; second, for buildings that do not have fresh air conditions, in order to prevent cross-infection, it is necessary to add medium-efficiency and sub-high-efficiency filters, which can effectively remove fine particles in the air; third, If the first two suggestions cannot be realized, it is recommended to avoid using central air-conditioning and use local heating.

Li Xianting: At the moment of the epidemic, in order to avoid cross-infection, the use of central air conditioners that share return air in multiple rooms needs to increase the fresh air volume while turning off the return air; for central air-conditioning systems that cannot increase the fresh air volume and must use return air, they should Try to use filters above F7 in the air conditioning unit or the return air outlet; considering that most areas of the country are still in the heating period, increase the fresh air volume while maintaining the indoor temperature to maintain the basic comfort requirements of the human body. 　　 For buildings without fresh air system or insufficient fresh air volume, it is recommended to open windows regularly for ventilation, and turn on the exhaust system when conditions permit. A room that has neither a fresh air system nor exhaust and cannot open windows for ventilation has a greater risk of cross-infection and should be avoided during special periods. Xu Wei: It should be emphasized that the above recommendations do not include hospitals and buildings with confirmed cases. Because the situation in hospitals is more complicated, personal protection must be done. Once confirmed cases are found in other buildings, the central air-conditioning system should be turned off in time. And carry out elimination and isolation work. In response to this epidemic, can you tell us what work related units in the industry have done?

Xu Wei: Based on the valuable experience during the prevention and control of the SARS epidemic in 2003, the Chinese Academy of Building Research and the Environmental and Health Related Product Safety Institute of the Chinese Centers for Disease Control and Prevention jointly compiled the national standard GB50365-2005 "Management Regulations for Operation of Ventilation and Air-Conditioning Systems". Chapter Five has formulated emergency management measures specifically for emergencies, and the standard was revised in 2019. 　　

The spread of the new crown pneumonia epidemic is basically the same as that of SARS, so the central air-conditioning response measures are the same as before, but higher requirements are put forward. On February 1, the China Academy of Building Research Institute of Building Environment and Energy Conservation launched the "Guidelines for the Operation and Management of Public Building Air Conditioning and Ventilation Systems during Epidemic Period", which is applicable to office buildings and other buildings such as hotels, schools, hospitals, and transportation hubs with the same function. It can be implemented by reference, and different functional parts need to be added or supplemented according to the used functions. Li Jianhui: The Facility and Equipment Technical Committee of the China Property Management Association and the China Academy of Building Research, according to the national standard GB50365 "Air Conditioning and Ventilation System Operation Management Standards", organized some professionals in the air conditioning system of the property management industry, together with experts from the China Academy of Building Sciences, in 2 On March 3, the "Technical Guidelines for the Operation and Management of Air-conditioning and Ventilation Systems in Public Buildings During the Epidemic Period (Trial)" was jointly issued in time to guide the safe operation of air-conditioning and ventilation systems in various public buildings during the epidemic prevention and control period. Since then, the China Property Management Association has successively issued the "Operational Guidelines for the Prevention and Control of New Coronary Pneumonia in the Property Management Area of ​​Colleges and Universities" and the "Operational Guidelines for the Prevention and Control of the New Coronary Pneumonia in the Property Management Area of ​​Industrial Parks". Liu Peng: Considering that the management of many office building property companies will face shortcomings after rework, China Construction Technology Group organized and compiled the "Guidelines for Emergency Measures for the Operation, Management and Use of Office Buildings". In the three directions of system, water supply and drainage system, daily disinfection, and garbage collection and temporary storage, concise and practical implementation measures are given to cut off pollution sources and transmission paths. 　　

Meng Qingguo: On February 3, the Chinese Society of Refrigeration, together with well-known experts and scholars in the industry, jointly compiled the "Recommendations on the Safe Use of Air Conditioning (Heating) after the Spring Festival to Respond to the New Coronary Pneumonia Epidemic" after work during the Spring Festival," which was officially released and reported to the China Association for Science and Technology. In the follow-up, we will also do a good job in industry services through the establishment of a WeChat group of experts, establishment of a dedicated telephone line, and submission of special reports to the China Association for Science and Technology. During the epidemic, can household central air conditioners be used normally? What are the precautions for users in use? 　　

Xu Wei: In the residence, without confirmed cases, suspected cases and close contact with them, the home central air-conditioning should be able to operate normally, but pay attention to opening windows for ventilation, frequent hand washing and necessary disinfection. 　　

Li Xianting: Compared with public buildings, the design of household central air-conditioning system is relatively simple, and families do not affect each other. If there are no potential infected persons in a family, it can be used normally. If a family member is a suspected case and needs to be properly isolated for observation, it is recommended that the quarantined person live in a room with exhaust function. Relatively speaking, this can ensure that the wind in the family flows from other rooms to the room, and minimizes the family Internal cross-infection situation. It should also be noted that, based on the experience of Hong Kong Amoy Gardens during SARS, residents should pay attention to maintenance when using water pipes and floor drains, and seal the water seals and floor drains to minimize the risk of cross-infection between different floors. 　　

Liu Peng: First of all, all water seals in the home must be sealed, including washbasin drains and floor drains, including shower drains, bathtub drains, sink drains, and washing machine drains. The user needs to check whether all the drain pipes have traps. For the bathtub and washing machine, if they are not or are not easy to determine the trap status, it is recommended to plug the bathtub drain when not in use, pull out the washing machine drain, and connect it when it is in use. Check whether the floor drain in your home is airtight, especially to clean the hair in the bathroom floor drain. If you cannot determine the depth of the water seal, you can plug the floor drain with a plastic bag filled with water. Some water can be seen in the bottom of the toilet. The drain pipe must be submerged when it is stored horizontally, and it should be noted that no bubbles can emerge in the water. In both cases, it needs to be repaired in time. Secondly, wash hands frequently at home and disinfect sanitary appliances frequently. 　　

Xinhuanet: During the epidemic, what specific suggestions do you have for the majority of upstream and downstream central air-conditioning enterprises? 　　

Li Xianting: First of all, in order to reduce the risk of cross-infection during the epidemic, some buildings have put forward central air-conditioning transformation requirements, which puts forward new requirements for the product design and improvement of central air-conditioning enterprises, and can bring new opportunities for industrial development. Secondly, from the perspective of the central air-conditioning industry itself, it should focus on solving problems that have not been solved before, such as how the central air-conditioning system can better adapt to needs and protect better in special environments such as designated hospitals and rebuilt shelter hospitals. Medical staff, etc. 　　

Third, many buildings attach importance to indoor temperature protection rather than ventilation systems. From the perspective of health and epidemic prevention, the priority of ventilation should be higher than room temperature protection. The indoor temperature must meet the demand while ensuring ventilation. The epidemic will prompt the entire industry to think about meeting new requirements for comfortable and healthy central air-conditioning products, design and operation. Xu Wei: Air-conditioning operation companies must actively cooperate with owners to operate and maintain scientifically in accordance with relevant guidelines to ensure the health and safety of personnel in buildings. Designers of central air-conditioning systems should actively think about and summarize the new problems, new requirements and requirements brought about by this epidemic. New measures to improve and upgrade relevant standards to better protect people’s health and respond to emergencies.