Let’s simulate a fresh air ERV with a maximum airflow of 500CMH without total energy recovery. To process fresh air at 35 degrees Celsius and 70% humidity to 20 degrees Celsius and deliver it to the room, a cooling capacity of 7.4KW is require
Electricity cost without energy recovery
Assumption: Air conditioning is a first level energy consumption, which means that the air conditioning consumes 1KW of electricity to generate 3 KW of cooling capacity.
The power consumption of air conditioning to bear the fresh air load for one hour is 2.4 kWh (7.4/3=2.4)
The electricity fee is calculated at an average of $0.1 per kilowatt hour. After turning on the fresh air, the air conditioner consumes 2.4 * 0.1 =$0.24 more electricity per hour than usual (electricity consumption * electricity price)
The fresh air system usually needs to be turned on 24 hours a day, which is 24 * 0.24=5.76 US dollars (usage time * power consumption unit price/hour)
The electricity cost for the air conditioner to bear the fresh air load during the three-month operation season of the summer fresh air fan is, 5.76 * 90 days=518.4 USD (daily power consumption * usage days)
Electricity cost with energy recovery
The heat recovery efficiency of fresh air ventilation is generally around 60%.
If the fresh air fan has heat recovery, it is 2073 * 0.1=207.3 US dollars (electricity consumption amount * total heat recovery efficiency)
Saveable electricity costs
In summary, both with and without heat recovery can save air conditioning electricity by 518.4-311.04=207.3 USD
During the three months of summer, the fresh air ventilation system with full heat recovery helped us save $207.3 in electricity bills. So, is ERV still an intelligence tax?
The enthaly exchange function of the fresh air ventilation does play a significant role in improving indoor environmental quality and energy conservation and emission reduction.
Post time: Jul-31-2024
