With the rapid development of society, people pay more and more attention to their own quality of life, in view ofWe80%The time is spent indoorsIndoor air quality is particularly important. The HVAC system plays an important role in improving the indoor environment.Measuring and controlling indoor air quality is becoming increasingly important.

      1.     Introduction to Indoor Air Quality

Human beings begin to breathe from birth, and stopping breathing means death. Breathing is closely related to air, and the quality of air determines the health and safety of breathing. The air quality in different regions is different, and the indoor and outdoor air quality is also very different.

Indoor air pollution has attracted more and more attention. The time of people's indoor activities continues to increase, but indoor air pollution is gradually increasing.Air pollutants are important factors affecting the quality of indoor environment in public places.indoor air pollutantsThe main sources are as follows: building and interior decoration materials, outdoor pollutants, combustion products and human activities. Among them, the pollution of interior decoration materials and furniture is the main aspect of indoor air pollution.Indoor pollutants such as PM2.5, PM10, carbon dioxide, formaldehyde, TVOC and other indoor pollutants exceed the standard, which will cause strong discomfort to the human body and cause a series of diseases. It can be said that there are great health risks.

2 HVACIntroduction of the system

HVACThe system and the air conditioner supply cold air, heating or dehumidification are similar in principle. The refrigerant is evaporated or condensed under the action of the compressor, which causes the evaporation or condensation of the surrounding air to achieve the purpose of changing the temperature and humidity. In the past, the HVAC system was started manually. The switch was started when needed and turned off manually when not needed. The main problem was that it was not intelligent enough and did not save energy. Now the HVAC system is generally more intelligent, the system is equipped with a temperature sensor, humidity sensor, dust sensor and other sensors, when the sensor detects the data to reach the system threshold, the corresponding adjustment function will start, the environment to reach a suitable state and then resume the standby state, the use of a lot of convenience, but also to achieve the effect of energy saving.

     3.Introduction of the sensor

Shenzhen Technology Co., Ltd. agent of a variety of alpha sensors are very suitable for indoor air quality detection and integration into the HVAC system, and for some harmful gases for accurate monitoring.

The photoelectric ion sensor can PID-AH5 measure VOC (volatile organic compounds) and some toxic gases in the range of (1ppb-40ppm). It has the advantages of fast response, high sensitivity and good stability. The sensor uses a bulb with special brightness and stability, which can reliably detect weak volatile and difficult to detect compounds over a long period of time.

       PID-AH5

      • linear dynamic range1PPBTo 40ppm(isobutylene)

      • Typical sensitivity: 50 mV/ppm (isobutylene)

      • 5Annual working life(Replaceable lamps and electrode stacks are not included)

      • Power consumption:80mW~200mWDepends on supply voltage

Alpha pioneered a serieslight scattering principleof optical particlesSensor(OPCs), This series has been continuously developing to provide customers with the best quality and lower cost sensors on the market. At present, our products: OPC-N3 and OPC-R2.

       OPC-N3

      • CountPM1,PM2.5 and PM10(PM4.25 optional)

      • Measurement range from0.35μmTo40μm (including flowersPowder detection)

      • Classify24Oneparticle size channel

      • Dimensions= 75mm(Long)x63.5mm(High)x60mm(Wide)

     OPC-R2

      • CountPM1,PM2.5 and PM10(PM4.25 optional)

      • Measurement range from0.30μmTo12.4μm (including flowersPowder detection)

      • Classify16Oneparticle size channel

      • Dimensions= 72mm(Long)x25.5mm(High)x21.5mm(Wide)