Why measure CO2 in hvac applications?
Measure the CO ₂ hvac applications
Generally speaking, in the region of the HVAC air conditioning (HVAC) CO ₂ sensor it is easy to use.Although such area, in most cases, have good environmental conditions, but the sensor will be reliable, easy to maintain and have long-term stability measurement.Introduces the measure how to help maintain the building and how to influence people health before operating costs, I will be detailed in this blog postCO ₂The fundamental cause of measurement requirements, as well asAccording to the demand controlled ventilation (DCV)The working principle.
Why measure the CO ₂ hvac applications?
While measuring CO ₂ common reason is energy-saving, but a growing body of evidence suggests thatIndoor air quality (IAQ)There is a direct contact with human health, which means that the CO ₂ measure for maintaining efficient and healthy working environment is also very important.Another reason is that regulatory compliance, especially in building owners hope to get some certification (requires the use of DCV and/or CO ₂ measurement).
The working principle of DCV on-demand ventilation control system
Graphic above shows the timing control ventilation and the difference between DCV.Article blue representation space (such as office) on the utilization rate of the day, the orange line shows the timing control ventilation works.In this case, the ventilation control of time in the morning 7 PM to 6 PM, night ventilation, to conserve energy.Gray line shows the DCV CO ₂ and work principle of the measurement.The user through the CO ₂ concentration sensor to measure the room, and controls the amount of fresh air into the, thus maintain CO ₂ concentration at the ideal level.Fresh air into the amount or ventilation fluctuates according to the building usage.
And hvac applications within the CO ₂ sensor related laws and regulations
Related to hvac applications is one of the important standards of ASHRAE 189.1 green building standards, the accuracy of the standard of CO ₂ sensor set strict requirements, and demanded that the sensor can measure or according to local data forecast outdoor CO ₂ concentration.This means that in practice, many people will turn to outdoor sensor.
The California energy commission (CEC - 400-2008-001 standard (residential and non-residential energy consumption standards) is one of the early release of energy laws and regulations.CO ₂measurement是 LEED v.4 绿色建筑标准的一项考量因素，如果用户在使用的空间内监控 CO₂ 级别，则可以获得两分。 如今还出现了与准确度、校准间隔和传感器维护相关的要求，这些要求越来越常见且意义非凡。为什么即使不需要维护也要进行测量？
Indoor air quality (IAQ) is a new topic.International WELL construction institute, for example, LEED and ASHRAE standards as the main basis set WELL construction standards.At present, standard focus is from the technical requirements to building the user's health.In 2010, the world health organization released a indoor air quality guidelines, including the guide, in view of the partial pollutants and discussed them may cause health threat.
The influence of hvac measurement of building operating costs
General office building operating cost breakdown is as follows:
Energy costs account for 1% of the construction total operating costs, lease and the cost of capital (9%), staff salaries accounted for 90%.This means that the employee health and working efficiency may be important factors related to hvac.Without CO ₂ measure to optimize hvac system may reduce staff work efficiency, which accounted for 90% of than the huge cost.
CO ₂ concentration level and the connection between the employees' work efficiency
Studies have shown that CO ₂ concentration has a great influence on human cognitive performance.The team conducted a study of Harvard University, at different concentrations of CO ₂ effects on specific skills.Studies have found that even the concentration of 1000 PPM level (regarded as does not affect the normal work of security levels) also would result in grave damage to crisis response, such as information use and strategic thinking skills.
CO ₂ concentration levels they can cause problems for employees to learn, to reduce the work efficiency, influence decision making, and even lead to dangerous errors.Overall, the study seems to supportGood indoor air qualityCan significantly improve the efficiency of this view.
In the next blog post, we will knowVisa pull CARBOCAP ® sensor technologyAdvantages in hvac applications.
browseHvac equipment productsOr visitHvac web siteTo look at it.