When we purchase VRF, some salesmen will mention "my brand VRF has electric auxiliary heat, efficient system of heating bar". Many friends have the following questions:
What is auxiliary heat?
Electric auxiliary heat is actually a thermistor, heating form similar to the old "electric heating ding". VRF electrified auxiliary heat, usually in the VRF indoor machine outlet add such a power of the heating wire, through the wind to bring the heating wire into the room.
When the outdoor temperature is relatively low in winter, it will affect the heating capacity of the compressor. In order to meet the national standard of heat production, many manufacturers have to add an electric auxiliary heat. So, in terms of function, electric auxiliary heat is optional. At the same time, ask the salesman if the VRF unit needs auxiliary heat distribution, and you can indirectly infer whether the heating capacity of the VRF unit to remove auxiliary heat is up to the standard.
VRV, does that mean higher heat production?
In fact, at this point, our common understanding of the situation is exactly the opposite of the actual situation. It is not because there is electric auxiliary heat on VRF, indicating high heat production; It is precisely because the heat of multi-link mechanism cannot meet the national standard that auxiliary heat is needed to make up for it.
Is it right to say, "with or without electric heat, heat will do"?
Yes, it can make up for a VRF winter heating capability, but that doesn't mean it's a better choice. This is mainly because there are three unavoidable "SINS" of using electric auxiliary heat on VRF.
The "three SINS" of VRF
1. Poor comfort
Because of the cold weather in winter, there is less moisture in the air. However, the temperature of the heating source of VRF is often very high, which will lead to drier air from the air conditioner. Chapping from the dry mouth to the chapped skin may also result in respiratory illness.
2, double power consumption
General air conditioning, or VRF heating, are through the refrigerant heat exchange, the heat in the outdoor air "transfer" to the indoor. Electric auxiliary heat is the same as the traditional "electric heating", which directly produces low-grade "thermal energy" through thermistors.
Compared with the form of air conditioning, electric auxiliary heat is not only inefficient, but also very environmentally friendly, there is a lot of waste.
It is the room of 3 rooms one hall that 5HP are configured on line likewise, below the circumstance with same heating effect, the charge of electricity of the many on line that electrify complementary heat a month unexpectedly tower above twice much!
3, there are safety risks
Most families cannot clean the frequency of standard requirement of multi-on-line indoor machine filter net, thus easy to reduce the air volume, lead to electric auxiliary heat temperature higher than normal value, cause deformation of plastic parts around.
However, with the growth of the use time of VRF, no matter it is the dirt adhering on the auxiliary heat of electricity, or the summer condensed water aggravating the heating wire aging, plus the high temperature of the heating wire itself for a long time, it may cause internal spontaneous combustion of the indoor machine.
Since electric auxiliary heat is not good, why do air conditioners generally add electric auxiliary heat?
Below the circumstance with lower outdoor temperature, the heating effect of general air conditioning can become very poor. Most brands will choose electric auxiliary heat, which can not only control the production cost, but also achieve the national requirements of heating effect. But this has passed on safety concerns and high usage costs to consumers.