So, i balanced my rads today so all rad returns are returning the same temperature which is 20 degrees below the primary flow. Before anyone says it should be 11 or 12 degrees, my worcester bosch boiler specifies that optimum performance is achienved when there is a 20 degree difference between flow and return.
Having closely watched the behaviour of the boiler during balancing i believe that the boiler will deliver a minimum temperature of 55 degrees (probably due to legionaires) and will only increase in temperature if the return is greater than 10 degrees difference or so.
My dilema is this;
With my alpha 2l pump on proportional curve setting the pressure delivered reduces with falling demand. This means there will be a greater flow rate through the bypass (fitted with a taconova flow setter rather than an auto bypass valve) ehen the ch demand is high and a lower flow rate through the bypass when the system is on overrun. This is the oposite of ideal!
The problem with this is that the hot water which passes straight into the return raises the temperature of the return thus causing the boiler to not burn as hot as it perceives the demand for heat to be less.
Fitting an auto bypass valve would clearly not resolve this issue either!
My question is this;
If i fitted a motorised valve on the bypass wiring it to open when the CH valve is closed and close when the CH is open would the 20 second period or so when both valves are closed (given that it takes longer for a valve to open that close) be danerous to the pump or the boiler, or would this brief period be irrelevant.
I know this is unconventional but it Could potentially optimise the boilers performance as return temperatures would be the full 20 degrees less.
If this worked i could direct the flow of the bypass through a rad (of sorts) that was outide of the house on the coolest shadiest part of the house. Fortunately for me this would be out of site in my home. This would be a suberb heat sync in the winter.
Ps. The HW system would similarly be wired to the bypass valve.
Am i conmpletely bonkers ir is this idea a stroke of genius?
Love to hear
Having closely watched the behaviour of the boiler during balancing i believe that the boiler will deliver a minimum temperature of 55 degrees (probably due to legionaires) and will only increase in temperature if the return is greater than 10 degrees difference or so.
My dilema is this;
With my alpha 2l pump on proportional curve setting the pressure delivered reduces with falling demand. This means there will be a greater flow rate through the bypass (fitted with a taconova flow setter rather than an auto bypass valve) ehen the ch demand is high and a lower flow rate through the bypass when the system is on overrun. This is the oposite of ideal!
The problem with this is that the hot water which passes straight into the return raises the temperature of the return thus causing the boiler to not burn as hot as it perceives the demand for heat to be less.
Fitting an auto bypass valve would clearly not resolve this issue either!
My question is this;
If i fitted a motorised valve on the bypass wiring it to open when the CH valve is closed and close when the CH is open would the 20 second period or so when both valves are closed (given that it takes longer for a valve to open that close) be danerous to the pump or the boiler, or would this brief period be irrelevant.
I know this is unconventional but it Could potentially optimise the boilers performance as return temperatures would be the full 20 degrees less.
If this worked i could direct the flow of the bypass through a rad (of sorts) that was outide of the house on the coolest shadiest part of the house. Fortunately for me this would be out of site in my home. This would be a suberb heat sync in the winter.
Ps. The HW system would similarly be wired to the bypass valve.
Am i conmpletely bonkers ir is this idea a stroke of genius?
Love to hear