Glandless Pumps - THERMO-ECO-ENGINEERING úvod

Planning Guide
High-Efficiency Pumps
Wilo-Stratos/Stratos-Z/Stratos-D/Stratos-ZD
Planning
Guide
High-
Efficiency
Pumps
Wilo-
Stratos/
Stratos-
Z/Stratos-D/
Stratos-
ZD
Utilisation of potable water circulation
(Wilo-Stratos-Z/Stratos-ZD)
Pumps used in potable water circulation systems are subject to
specific requirements which are satisfied by the Wilo-Stratos-Z/
Stratos-ZD series:
- The fluids involved are potable water and water for food businesses
in accordance with the TrinkwV 2001 (German Potable Water Ordinance).
The design of the pumps take into account calcification in
such a way as to permit total carbonate hardness of 20°d at a max.
fluid temperature of +80 °C.
- All plastic parts that come into contact with the conveyed media
conform to the KTW recommendations.
- The differential-pressure control modes p-c and p-v allow automatic
adjustment of pump performance in variable volumetric-flow
potable water circulation systems with thermostatically controlled
line shutoff valves.
- The manual control mode allows optimum manual adjustment of
pump performance to the constant volumetric-flow circulation system.
This can be performed for example with the Wilo-IR-Monitor.
The criterion for this is the temperature of the potable water in the
circulation pipe which upon entry into the potable water accumulator
is permitted to be a max. of 5 K below the accumulator temperature
High-Efficiency Pumps
The pump overall efficiency is determined by the hydraulic and motor
efficiencies. Both components have been doubled in the Wilo-
Stratos in comparison with the glandless pump previously used in
building engineering and thus significantly improved.
The applied ECM technology drastically reduces the annual power
consumption, achieving significant cost savings in comparison to
conventional pumps.
Annual power consumption of a heating pump (DN 30) with setback operation*
Comparison of different pump types
High-efficiency pump Stratos 30/1-12
Energy-saving pump TOP-E 30/1-10
Standard pump TOP-S 30/10
* Load profile with 5500 operating hours per year:
396
1216
1832
0 1000 2000
Power consumption [kWh/a]
2% (110 hrs.) at 100% QN(peak load)
25% (1375 hrs.) at 65% Q N(partial load)
40% (2200 hrs.) at 30% Q N(low load)
33% (1815 hrs.) setback operation
Wilo-TOP-E with AC motor
Wilo-Stratos with EC motor
Comparison of motor components
Advantage: The magnetic field required in the rotor does not first
have to be generated with losses.
Advantage: Particularly in the partial-load range (up to 98% of the
operating time), the difference in efficiency in comparison
with an asynchronous motor will be even greater
than it already is anyway in the full-load range.
Advantage: This motor can be operated at higher speeds than with
an asynchronous motor. This leads to a reduction in size
and weight of the pump with comparable hydraulics.
Wet rotor encapsulation
The rotor of the glandless pump motor runs in the pumping medium.
This fluid serves to lubricate the bearings and cool the motor.
The current-carrying stator is separated from the pumping medium
by a can, this being known as the wet rotor encapsulation.
This wet rotor encapsulation directly influences efficiency
- through the size of the necessary gap between stator and rotor,
- through the magnetic resistance of the selected can material.
- In this respect the efficiency improvement on the Wilo-Stratos
results from:
- reduction of the air gap and
- utilisation of an innovative can material with smaller losses to the
magnetic flux between stator and rotor.
Hydraulic optimisation
Optimised hydraulic conditions are provided by a 3D spiral housing,
an 3D impeller and a smooth surface in the pump housing (cataphoretic
painting).
The suction throat seal between impeller and pump housing reduces
radial gap losses. Axial losses are reduced by the lip seal at the front
of the impeller.
Heating, Air-conditioning,
Cooling
Potable water circulation
Solar thermal
Service/Accessories, Systems
ECM technology
The new ECM technology is the basis for the outstanding efficiency
of the Wilo-Stratos. It consists of:
EC motor
EC stands for electronically commutated motor. Its basis is a synchronous
motor with a permanent magnet rotor. The rotating stator
flux is generated by electronic commutation, meaning that the stator
windings are specifically activated for the reciprocal action of the
electrical and magnetic poles.
Switchgears and Control
Devices Pump Management
Systems
Wilo Catalogue A1 - Circulating pumps in glandless design
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