> Anthony Lui said:
> More or less.
> You can adjust the ratio of fresh air to exhaust air.
> 100% fresh air: very energy consuming, but lower CO2 concentration generally
> 100% exhaust air (close loop): CO2 concentration increases over time, but it saves energy.
> So, there should be good balance.
> When you drive a car, you can adjust. But I don't know whether a bus driver can do this when he drives.
> Anthony Lui
> Anthony's Bus Homepage