Regarding the question of whether the fresh air system and central air conditioning(AC) are redundant or complementary, we will answer them separately:
1. Are they redundant or complementary?
2. Is it necessary to install the fresh air system and central air conditioning at the same time?
1.Different functions
First of all, it can be determined that in terms of function, central air conditioning and fresh air system are not redundant. Central air conditioning adjusts indoor temperature through compressor cooling and heating, which belongs to indoor circulation.
The fresh air system uses the exchange of indoor and outdoor air to ensure indoor air quality, which belongs to indoor and outdoor circulation.
2.Complementary in comfort
The two are complementary in terms of comfort.
Central air conditioning uses compressor cooling and heating to ensure that the indoor environment is at a comfortable temperature.
The fresh air system adopts an “active” ventilation method to discharge the indoor dirty air to the outside and send the outdoor fresh air into the room. Before the two airflows enter the heat exchange core, they are filtered and purified separately.
Due to the enthalpy difference (different temperature and humidity), the two airflows generate heat and conduct heat, thereby pre-cooling and pre-heating the fresh air entering the room, so that the fresh air enters the room at a state close to room temperature, avoiding the excessive temperature difference caused by opening windows for ventilation in winter, affecting the comfort, and playing a role in energy saving for the equipment.
Comparison of air outlet temp under different thermol efficiency conditions at the same indoor and outdoor temperatures
3.Is it necessary to install them at the same time
Many people are entangled in whether to install central air conditioning and fresh air systems at the same time. There are three reasons for the entanglement:
1. Whether the budget is sufficient.
2. There are blind spots in the understanding of central air conditioning and fresh air systems.
3. Do not live in areas with poor air quality
The issue of budget will not be discussed. In areas with poor air quality, such as centralized heating areas, haze is inevitable in winter.
4.Carbon dioxide CO2 concentration
The human body is not sensitive to the high or low CO2 concentration. It will only be noticed when the value exceeds the standard, and it will be harmful to health at that time.
The only way to reduce CO2 is to open windows for ventilation, and the use of fresh air systems can provide continuous ventilation 24 hours a day, 365 days a year. Regardless of wind, rain, snow, flying catkins, severe winter, outdoor noise, and odor, the fresh air system can work without opening windows.
Continuous ventilation can not only reduce the concentration of carbon dioxide, but also eliminate odors and VOC volatile organic compounds such as benzene and formaldehyde.
5.Necessity of improving air quality
In recent years, more and more finely decorated houses have adopted fresh air systems as standard configurations, which shows the importance of fresh air systems. Especially in areas with poor air quality, continuous air exchange is particularly necessary.
Although central air conditioning can adjust the temperature, it cannot effectively remove harmful gases in the room, such as carbon dioxide and formaldehyde. Therefore, as an effective means of air purification, the fresh air system can continuously bring fresh air to the room and ensure the health of the living environment.
Moreover, even in areas with better air quality, the fresh air system can avoid heat loss caused by opening windows in winter, maintain the stability of indoor temperature, and further improve living comfort.
6.Combination of energy saving and comfort
From the perspective of energy saving, the installation of fresh air system and central air conditioning(AC) not only improves air quality, but also reduces energy waste caused by frequent window opening.
By preheating or precooling the fresh air entering the room, the fresh air system can ensure the relative stability of indoor temperature,reduce the burden of central air conditioning cooling or heating. This intelligent adjustment method can significantly reduce energy consumption, thereby achieving the goal of energy saving and environmental protection.
In addition, the combination of the two can further improve air quality while ensuring comfortable temperature, making the living environment healthier.
7.Conclusion
The installation of fresh air system and central air conditioning is complementary. The two are responsible for different functions.
The central air conditioning adjusts the temperature, and the fresh air system ensures air quality. Therefore, especially in an environment with poor air quality, installing both at the same time can help improve the comfort and health level of the living environment.
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