2 K SETS - Energija plus

CHOICE PARAMETERS OF A UNIT
IN ORDER TO SUPPLY WATER TO APARTMENTS,
IT LODGES, SIMILAR HOSPITALS AND BUILDINGS
To be able to choose a pump you have to know two things: how much water is needed and to what height it
has to be taken. In the following table you will see how water is used in a house or flat.
Q (l/min)
Toilet with quick flush 90
Bath tub 15
Shower 12
Washing machine 12
Dish washer 10
Wash basin 9
Sink 6
Bidet 6
Toilet with flushing cistern 6
166
Of course, 166 Lt./min are not needed
for a flat because the shower, toilets,
etc., are not used all at once, so to calculate
how much water is needed
mathematical formulas have to be used
which will give us the required quantity
of water for flats. The results of such
calculations are given in the following
tables.
To flats
To hotels and hospitals
In the case of flats with two bathrooms increase the quantity of water 30%.
In the case of flats with three bathrooms increase the quantity of water 25%.
In the case of flats with four bathrooms increase the quantity of water 20%.
For tourist resorts multiply the number of flats by 1,2.
When we know the number of flats or beds, we know how much water is needed. The pump must take the
water to the highest floor in the building and its pressure must be at least 1 bar (about 10 m) in the furthest
point. But the pump must overcome the leaks in the system while it is helped by the pressure from the water
mains. So the pump’s head is worth:
H = (building H + leak H + residual H) - water mains H (m)
Considering that the leaks are equivalent to about 20% of building H we have:
H = (1,2 x building H + 10) - water mains H (m)
Summarising: 1) From the number of flats find the quantity Q.
2) From the height of the building and water mains pressure find H.
3) From the tables on the following pages choose the pump that has, as its end of curve
point, the calculated values of Q and H and which has at least 2 bar (20 m) between the
start and finish of the curve.
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