Most Domestic Hot Water (DHW) systems require water to be supplied at 60 oC via the secondary circuit of an Instantaneous AEL Plate Heat Exchanger which in turn requires a certain amount of KW power from the Primary heat source.

When mixing valves are used at each tap or shower outlet in a DHW system the KW demand can be reduced because the PHE water at 60 oC is automatically blended through a mixing valve with mains cold water at 10 oC to arrive at a pre determined temperature of say 40 oC (as shown below) at the outlet of a shower or tap when required .

The temperature on each DHW circuit outlet can be adjusted at the mixing valve by altering the percentage of hot and cold water mixed to suit whatever is required at each appliance on site.

Each AEL domestic hot water Plate Heat Exchanger whether it is an AEL fully controlled Packaged unit , Brazed Plate or Plate and Gasket type heat exchanger each can be made to suit the temperature you require but most DHW systems are designed to supply water at 60 oC to avoid the growth of legionella .

The designs shown below are based on a flow rate of 60% of DHW from a Packaged Plate Heat Exchanger at 60 oC being mixed with 40% of mains cold water at 10 Oc giving an outlet temperature of 40 oC.

 

AELTHERM MODEL     DHW FLOW RATE @60 Oc     MAINS COLD WATER FLOW RATE @ 10 Oc.    MIXED OUTLET FLOW AT 40 oC

DHW020510 – 25.2KW         0.12 L/S                                         0.08 L/S                                                           0.20 L/S

DHW025510 – 31.5 KW        0.15 L/S                                         0.10 L/S                                                           0.25 L/S

DHW035510 – 44.1 KW        0.21 L/S                                         0.14 L/S                                                           0.35 L/S

DHW045510 – 56.7 KW        0.27 L/S                                         0.18 L/S                                                           0.45 L/S

DHW055510 – 69.3 KW        0.33 L/S                                         0.22 L/S                                                           0.55 L/S

DHW060510 – 75.6 KW        0.36 L/S                                         0.24 L/S                                                           0.60 L/S

DHW065510 – 81.9 KW        0.39 L/S                                         0.26 L/S                                                           0.65 L/S

DHW075510 – 94.5 KW        0.45 L/S                                         0.30 L/S                                                           0.75 L/S

DHW085510 – 107 KW         0.51 L/S                                         0.34 L/S                                                           0.85 L/S

DHW100510 – 123.9 KW      0.59 L/S                                         0.39 L/S                                                           0.98 L/S

DHW120510 – 149.1 KW      0.71 L/S                                         0.47 L/S                                                           1.18 L/S

DHW150510 – 186.9 KW      0.90 L/S                                         0.60 L/S                                                           1.50 L/S

DHW180510 – 224.7 KW      1.08 L/S                                         0.72 L/S                                                           1.80 L/S

DHW210510 – 262.5 KW      1.26 L/S                                         0.84 L/S                                                           2.10 L/S

DHW2401410 – 300.3 KW    1.45 L/S                                         0.96 L/S                                                           2.36 L/S

DHW2701410 – 338.1 KW    1.62 L/S                                         1.08 L/S                                                           2.70 L/S

DHW3001410 – 375.9 KW    1.81 L/S                                         1.20 L/S                                                           3.01 L/S

DHW3301410 – 413.7 KW    1.97 L/S                                         1.31 L/S                                                           3.28 L/S

DHW3501410 – 438.9 KW    2.09 L/S                                         1.39 L/S                                                           3.48 L/S

DHW3801410 – 474.6 KW    2.28 L/S                                         1.52 L/S                                                           3.80 L/S

DHW4101410 – 512.4 KW    2.47 L/S                                         1.64 L/S                                                           4.11 L/S

DHW4401410 – 550.2 KW    2.65 L/S                                         1.77 L/S                                                           4.42 L/S

DHW4701410 – 588.0 KW    2.83 L/S                                         1.88 L/S                                                           4.71 L/S

DHW5001410 – 625.8 KW    3.01 L/S                                         2.00 L/S                                                           5.01 L/S

DHW5301410 – 663.6 KW    3.19 L/S                                         2.12 L/S                                                           5.31 L/S

DHW5601410 – 701.4 KW    3.38 L/S                                         2.25 L/S                                                           5.63 L/S

DHW6001410 – 751.8 KW    3.60 L/S                                         2.40 L/S                                                           6.00 L/S

DHW6301410 – 789.6 KW    3.80 L/S                                         2.53 L/S                                                           6.33 L/S

DHW6601410 – 827.4 KW    3.98 L/S                                         2.65 L/S                                                           6.63 L/S

DHW7001410 – 877.8 KW    4.23 L/S                                         2.84 L/S                                                           7.07 L/S

Domestic Hot Water (DHW) Plate Heat Exchangers can be supplied as a Plate / Gasket unit or supplied as a Brazed Plate unit