1Underground garage carbon monoxide monitoring system schemeSystem Overview

Underground garages are enclosed or semi enclosed buildings with limited air circulation. The environmental pollution of underground garages mainly comes from car exhaust, which is mainly composed of carbon monoxide. The most significant impact on human tissue hypoxia is on the heart and brain.

In recent years, the country has also begun to put forward requirements for carbon monoxide monitoring systems in underground parking garages, which are in line with industry standards in the People's Republic of ChinaArticle 9.5.5 of JGJ/T 229-2010 "Code for Green Design of Civil Buildings" clearly states that "carbon monoxide detection and control devices should be installed to control the operation of the ventilation system in garages with mechanical ventilation." In the national standard GB-T50378-2014 "Green Building Evaluation Standard" of the People's Republic of China, Article 8.2.13 clearly states that "the installation of carbon monoxide concentration monitoring devices linked to exhaust in underground garages has an evaluation score of 5 points." In addition, in Article 8.2.11 of the "Green Building Evaluation Standard" DB37/T 5097-2017 of Shandong Province, it is clearly stated that "the installation of carbon monoxide monitoring devices linked to exhaust equipment in underground garages has an evaluation score of 7 points. Provinces and cities have gradually introduced directional requirements for monitoring underground CO concentration in local green building standards. ShanghaiZhilian Intelligent Technology Co., LtdA professional integrated monitoring and control solution has been designed for the carbon monoxide monitoring system and ventilation linkage system of the underground garage.

According to the test, the concentration of carbon monoxide in the air has reachedAt 50ppm, healthy adults can tolerate it for 8 hours; When reaching 200ppm, healthy adults may experience mild headaches and fatigue 2-3 hours later; When reaching 400ppm, healthy adults experience frontal pain within 1-2 hours, which is life-threatening after 3 hours; At 800ppm, healthy adults may experience dizziness and spasms within 45 minutes, lose consciousness within 2 hours, and die within 2-3 hours.

The production of carbon monoxide in underground garages mainly comes from car engines. When the engine is idling, due to insufficient combustion of gasoline, a large amount of carbon monoxide is producedCO exhaust gas. Underground parking lots are enclosed environments where vehicles frequently enter and exit, and the exhaust emissions are difficult to release. This can easily accumulate a large amount of CO gas, causing a pungent odor to pervade the parking lot and harming human health. Therefore, underground garages and parking lots should be equipped with air supply and exhaust systems, and fresh air should be used for replacement. The CO content in underground garages should be below 25ppm in the long term and not exceed 37.5ppm in the short term.

IIUnderground garage carbon monoxide monitoring system schemesystemdesign scheme

1. System design basis

GB 12358-2012 General Technical Requirements for Gas Detection and Alarm Devices in Workplace Environment

JJG 915-2008 "Carbon Monoxide Detection Alarm"

◆GB50189-2015 "Design Standard for Energy Efficiency of Public Buildings"

◆JGJ/T 229-2010 "Code for Green Design of Civil Buildings"

GB/T18883-2002 "Indoor Air Quality Standards"

2. System design scheme

2.1 Working principle of the system

According to the principle of electrochemistry, the electrochemical oxidation process of the gas under test on the working electrode potential in the electrolytic cell is utilized. The current generated by the electrochemical reaction of the gas under test is proportional to its concentration and follows Faraday's law. By measuring the magnitude of the current, the current under test can be determinedCO gasThe concentration. Monitor the concentration of carbon monoxide gas in the environment and issue an alarm,The entire system adopts a two bus approachImplement controlFan start stopAnd system integration, it can achieve two-level sound and light alarms for compensating gas concentration under different temperature environments. The alarm points can be set by themselves and can be linked to external devices such as exhaust fans or solenoid valves.

2.2 System Architecture

Install one in the control roomAir quality management hostReal time displayunderground parking garageThe concentration of all carbon monoxide detectorsandOperation status and other information. Install according to the area of each fire compartmentA set of air qualityController and severalsetCarbon monoxide detector，whenAny carbon monoxide detector in this fire compartmentWhen the concentration reaches the preset alarm point, the area in questionAir quality controllerSend out an alarm signal, and at the same timeActivate thisPartition fans for air replacement,whenWhen the concentration of carbon monoxide is lower than the set value, the fancanAuto Close，The entire system operates automatically without the need for manual supervision.

2.3 Systemarchitectureimage

IIISystem equipment composition

The underground garage carbon monoxide monitoring system is mainly composed ofCarbon monoxide (temperature and humidity)DetectorAir quality controller、Air quality management hostform.

3.1 environmentdetector

3.1.1 Carbon monoxide detector

Product Model:ZH-Q200CO

Technical Specifications:

Product dimensions:86*86*35（mm）

Product Material:ABS

Working voltage:DC24V

Measurement range:0-1000ppm

Communication method: Two bus

Installation method: Standard86 box installation

Protection level:IP30

3.1.2 Temperature and humidity detector

Product Model:ZH-Q200WS

Technical Specifications:

Product dimensions:86*86*35（mm）

Product Material:ABS

Working voltage:DC24V

Measurement range:0~50℃，0~100%RH

Communication method: Two bus

Installation method: Standard86 box installation

Protection level:IP30

3.2 Air Quality Controller

Product Model:ZH-Q200KZQ

Technical Specifications:

Product dimensions:160*95*55（mm）

Product Material:ABS

Working voltage:AC220V

Output signal:1 passive contact

Installation method:35mm standard guide rail

Protection level:IP30

Can connect at most64 CO detectors

3.3 Air Quality Management Host

Product Model:ZH-Q200ZJ

Technical Specifications:

Product dimensions:500*400*120（mm）

Working voltage:AC220V

Communication method:CBUS bus

Communication line:NH-RVS-2*2.5mm2

Communication distance:≤1000m，Exceeding the length can be extended through the regional extension

Protection level:IP30

Installation method: Wall mounted

Embedded management software, connectable200An air quality controller;

4system wiring diagram