VAV Box Electric Reheat V Heating Coil
VAV Box Electric Reheat V Heating Coil
(OP)
Any body got and suggesting regarding the use of hot water heating coils in the VAV boxes as opposed to electric heaters. Do you get problems with small valves failing, blocking with dirt from the piping system, poor maintenance,...
Which is regarded as Cheaper, more energy efficient?
Which is regarded as Cheaper, more energy efficient?





RE: VAV Box Electric Reheat V Heating Coil
1.Electric heaters with SCR control will help you control temperature in a tight band whereas hot water coils in VAV boxes with their very low flow rates use only on/off valve control
2. The installation cost for hot water coils is more as compared to electric heaters.But their operation cost may be less depending on the fuel used for the boiler/hot water generator.
3.Electrical heaters pose a fire risk in the building.
RE: VAV Box Electric Reheat V Heating Coil
But Q = (COPref+1)W, which is the COP equation of a heat pump. i.e you can produce more heat than 1 kW when you use the electricity to run a heat pump. Lord Kelvin addressed these issues of inefficiency long back.
I found difficulties even with thyristor controls and other proportionate controls because of high thermal inertia of the heating elements. (note that, generally, electric resistors are good heat resistors)
Secondly, as the surface temperature of an electric heater is very higher than what is required, it cannot be used where you have solvent usage in your production area.
High switching frequency of electronic controls will lead to noise in your other equipment control systems.
Regards,
RE: VAV Box Electric Reheat V Heating Coil
RE: VAV Box Electric Reheat V Heating Coil