Glanded Pumps - THERMO-ECO-ENGINEERING úvod

Planning Guide
Scope of delivery
Pump, including packing, installation and operating instructions
Accessories
Electronically controlled In-line pumps:
- IF Modul: PLR or LON for the Series IP-E, DP-E, IL-E, DL-E (see also
Catalogue section “Switching Devices and Control Systems”).
- IR-Monitor for the Series IP-E, DP-E, IL-E, DL-E.
- Analogue interface converter
(see also Catalogue section “Switching Devices and Control Systems”)
- Digital interface converter
(see also Catalogue section “Switching Devices and Control Systems”).
- Mounting brackets for installation on a base
- Blank flanges for twin-head pumps
Uncontrolled In-line and monobloc pumps:
- Wilo control system for continuous regulation of motor speed to provide
specified pump operating mode.
- Changeover switches for automatic control of operational and
reserve pumps (see also Catalogue section “Switching Devices and Control
Systems”).
- Mounting brackets for installation on a base
- Blank flanges for twin-head pumps
Pump duty splitting
In association with the continuous regulation of power, the “Split
solution” is available for optimisation, starting with the medium
pump power range (1–1.5 kW). This provides for the use of 2 smaller
pump aggregates or a twin-head pump in place of a large pump to
distribute the maximum design performance.
In the normal case, i.e. over 85% of the heating season, one pump is
adequate as the basic load aggregate. The second pump is available
to satisfy peak load requirements.
Note:
The extra cost of the pumps is more than compensated by power
savings on the control devices.
Advantages of pump duty splitting:
- Electricity savings of between 50% and 70%
- A second pump is always available for standby duty.
With the so-called “Split solutions” one pump is operated for basic
load requirements, whilst the other pumps are in parallel circuit for
peak load duty.
This ensures that the design requirement is in accordance with
DIN 4701. In conjunction with an auto pump control system, continuous
adjustment of pump capacity to the ever-changing load demand
can be achieved.
Note:
Wilo Auto control systems for dual or multiple pump installations
feature the peak-load operation facility.
Continuously controlled peak load operation of a twin-head pump
with two equal power motor impeller units.
Caption:
PH = Main pump (base load)
PS = Trailing pump (peak load)
QV = Full-load flow volume
QT = Partial-load flow volume
P1V = Full-load power consumption
P1T = Partial-load power consumption
Investment costs
The total investment costs in heating systems can be reduced by
almost 1 / 4 with “Split-solutions”. Particularly when use is made of
twin-head pumps in place of single pumps, with their very high
installation costs (Y-pipes, etc.)
Note:
Due to their low outlet velocities, Wilo twin-head pumps are particularly
suitable for parallel operation.
Operating costs
Considerable reductions in the operating costs also ensue as a result
of the large saving in current of the lower performance “Split aggregates”,
since these supports better utilisation in the partial load range
and, in particular, in the low load range.
Standby facility
From an operating point of view there are other advantages, because
in the event of failure in the partial load range and the low load range
a 100 % reserve is available and in the peak load range, on the few
extremely cold days, there is a so-called emergency reserve (75%).
12 Subject to change without prior notice 09/2006 WILO AG
Delivery head H[%]
Power requirement P[%]
100
40
0
100
50
0
n = 60 %
n = 2 x 100 %
n = 100 %
PH
QT 50 % QV 100 %
P1T
Q[%]
PH +
PS
p = constant
P1V