solar set up

[bster]

went to a job today and was 'checking' out there smart energy solar install. The system consisted of a tank fed combination cylinder with the solar circs at the botom and the DHW draw off at the top, but there was TMV on the DHW outlet with the mains cold tee'd off the blending valve and going into the cylinder - whats the cold inlet into the cylinder for?

my guess i that its a secondary coil that will provide pressurised DHW?

 

[micky p]

can't quite picture what you are describing but there is a TMV so that it isn't sending the water to the combi too hot and also it will increase the capacity as it is blending cold water with hot. Solar can get quite hot so best to have a TMV on the hot outlet. Althought i wouldn't store the water any higher than 65 deg C.

 

[Bamber gaspipe]

went to a job today and was 'checking' out there smart energy solar install. The system consisted of a tank fed combination cylinder with the solar circs at the botom and the DHW draw off at the top, but there was TMV on the DHW outlet with the mains cold tee'd off the blending valve and going into the cylinder - whats the cold inlet into the cylinder for?

my guess i that its a secondary coil that will provide pressurised DHW?

cold to fill cylinder, thermostatic blending valve on hot out to ensure hot taps at 60 degrees, works on same principle as a thermal store, where temp in cylinder is usually 75 to 80 degrees.

 

[bster]

Bamber - thats what i thought, the cylinder is a thermal store, with the cold running through and out as hot water.

 

[Bamber gaspipe]

The cold inlet at the cylinder runs through a coiled heat exchanger & back out through blender at 55-60 degrees. Hot water at mains pressure. I stated before that the cold supply into cylinder was to fill it, my mistake, the cylinder is filled by the integral feed & expansion cistern.

 

[bster]

I did notice your confusion, but didnt want to tell you