Control using CO2 sensors
Demand control based on CO2 content is an excellent method for managing the indoor air quality in every required places, such as schools, academies and universities, Coal Mines, Industries, Car Park areas, Power Plant, Cold Storage and Fruit Ripening Chamber . An indoor environment with good air quality could be expected to have a CO2 concentration of between 850 and 1250 ppm, which poses no issues to mental function. Studies have shown that high levels of CO2 have an adverse effect on people’s ability to concentrate and take decisions. Beyond 2,000 ppm human being can expect to experience lethargy, drowsiness and lack of concentration.
CO2 sensors , air handling units with demand controlled ventilation are compact and can be wall-mounted or integrated within the casing. Their operating range is between 0 – 2,000 ppm. Crucially, they can be used for modulating control of the heat recovery ventilation system. Typical set values for a CO2 sensor are Minimum CO2 = 500 ppm (for the initiating signal) and Maximum CO2 = 900 ppm (for full throughput).
Demand controlled ventilation using carbon dioxide (CO2) sensors is essentially a combination of two technologies: sensors which monitor CO2 levels in the air inside a building and an air handling unit (AHU) that uses data from the sensors to regulate the amount of ventilation air admitted.
CO2 sensors can be paired with a ‘base’ level of direct ventilation. In this mode, the heat recovery ventilation unit is programmed to run continuously at low load, until a signal from the sensor indicates that air quality has begun to change. As long as the CO2 level remains above the minimum threshold, the AirMaster heat recovery air handling unit continues under modulating control.
To prevent stop/start cycling around the CO2 entry level, the start point is automatically programmed to ‘lower limit + 10%’. The stop signal is generated at the lower limit exactly.
From an energy saving perspective, CO2 control makes a great contribution by preventing losses incurred through over-ventilation, without compromising on consistency of good indoor air quality.
The potential of CO2 sensors and demand controlled ventilation for operational energy savings is considerable. The highest benefit can be expected in school classrooms, seminar rooms, meeting rooms and other spaces in which occupancy is variable.
The higher the prevailing utility rates, the higher the benefit.
Control using CO Sensors Transmitters
CO sensors provide signals which can be used for start / stop control of heat recovery ventilation units. These sensors respond to minute increases of smoke or CO gas emitted from within their field of vision, which are then interpreted in terms of Electrochemical detection sensitivity within a range of 700 Square meter .
Their operating range is between 0 – 300 ppm. Crucially, they can be used for modulating control of the ventilation system. Typical set values for a CO sensor are Minimum CO = 25 ppm ( TWA Limit of CO Gas) (for the Fan ON signal) and Maximum CO = 200 ppm (For Fan And Fire Alarm Signal).
From an energy saving perspective, CO sensor Transmitter makes a great contribution by preventing losses incurred through over-ventilation, without compromising on consistency of good indoor air quality.
The potential of CO sensors and demand controlled ventilation for operational energy savings is considerable. The highest benefit can be expected in school classrooms, seminar rooms, meeting rooms, Coal Mines, Car Park, Chiller, Plant and other spaces in which occupancy is variable.
Control using humidity sensors
Humidity Sensor v units can be used to monitor and control relative humidity (RH) of ventilation system. This can be achieved with RH sensor which have a humidity measuring sensor. accurate operation range of humidity is within the range 25 – 95% RH.
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