Meaning of Delta 50 (75/65/20)
Delta 50° (75/65/20) - with Delta T of 50°C, means 75°C inlet water temperature, 65°C outlet water temperature and 20°C of room temperature. The average water temperature in this example is 70°C (i.e. 75° plus 65°, divided by 2). If we then take the 20°C room temperature we are left with a temperature differential of 50°C or Δt 50°.
Add the flow water temperature and the return temperature together
Divide the answer by 2
Subtract the room temperature from the answer this gives you the Delta T temperature
Select the closest Delta T valve from the table and multiply the corresponding factor by the output provided for the particular radiator to obtain the output for your calculated Delta T valve.
|Btu Value T50||T50 to T35 (T50 x 0.6290)||Equivalent T50 figure to give the required T35 is T50 / 0.6290|