Brochure
Variable speed technology
Continuously matches cooling needs with high efficiency
Variable speed technology is the premium solution in commercial air conditioning
when it comes to energy savings, optimal comfort, accurate humidity and
temperature control and controlled impact on the electrical network.
Around 85% of traditional commercial air conditioning installations are oversized
to enable them to handle peak load conditions (about 3% of the operating time).
Variable speed technology continuously matches building cooling demand under
part-load conditions which is the vast majority of operating time. It also handles
peak load conditions in a cost effective way. With a very low starting current and
the ability to manage power fluctuations, Danfoss variable speed solutions ease
the strain on power grids.
Danfoss is a world leader in this segment and offers the widest available range of
commercial scroll, reciprocating and oil-free centrifugal inverter compressors for
systems from 3 to 350 tons in single compressor/circuit configurations. Capacities
of over 1,000 tons can be achieved by using multiple compressors and circuits.
Danfoss Inverter Scrolls VZH – 3
rd
generation with IDVs
3
rd
generation Danfoss inverter scrolls feature an Interior Permanent Magnet (IPM)
and dedicated variable speed drive designed to provide maximum efficiency
across the full operating range. Adapting to varying pressure ratios, it delivers the
highest level of efficiency across a wide range of applications. Numerous case
studies in renovation projects and laboratory testing demonstrate energy savings
of up to 35%.
Tandem 15TR Inverter scroll VZH117 Dierence
EERnet 3.22 3.17 -2%
SEER 3.16 4.15 31%
Annual En. Input (kWh) 23 386 22 470 -24%
Running cost (€) (*) 4 996 3 820 -1 176 €
CO
2
emission
(metric Tons) (**)
11.8 9.0 -2.8
(*) based on European average climate: 2602 running hours
17 € cents per kWh: European average for commercial buildings (VAT incl.)
(**) 0.0004 Tons of CO
2
per kWh, EU average 2015
Rooftop parameters:
Tcond: 50° C
Tevap: 11° C
Fan Pw(*): 9.5%
Evap. Fan Pw(*): 18.0%
(*): of Comp. Pw at full load
European SEER according to EN14825
100kW A/W Rooftop: 1 circuit
Savings with Danfoss inverter scrolls VZH
Savings on
running costs
10 Compressors for Commercial Air Conditioning