Air conditioning 1 VRF systems
The Centrifugal from Hitachi. > The new units also feature longer pipe-runs (up by 765mm, or 1,200mm by 765mm for the two largest
from 510m to 1,000m) and a piping length after the models with three rather than two compressors.
first branch that has more than doubled to 90m, and At the core of this technology, says Samsung, is the
the maximum height difference between indoor units Copeland digital scroll compressor, teamed with fixed
is up from 15m to 18m. Maximum vertical separation scroll compressors to provide variable output across
of outdoor and indoor units is 50m. Even the length the operating range. In the larger capacity systems,
of electrical wiring is increased by 50 per cent to a compressors are activated in a different sequence each
maximum 1,500m. time in a bid to improve long-term reliability and part-
Efficiency is also a priority for Samsung, whose load efficiency.
DVM Plus III system – available in both heat pump The digital scroll compressors permit continuous
and heat-recovery versions – have CoP ratings up to heating or cooling during oil recovery, said to be a >
4.57 in heating mode and 3.89 in cooling mode.
However, although the CoP is important, Samsung
says it does not believe it tells the whole story. ‘For
example,’ it says, ‘most manufacturers measure CoP
when their systems are operating at an optimum 60-
100 per cent of maximum output, as in mid-winter and
mid-summer. But what about the months between,
where demand for heating or cooling is less than 30
per cent of capacity?’
For Samsung, one answer lies in IPLV (Integrated
Part Load Value) – a part-load efficiency rating system
originally developed by the North American Air-
Conditioning and Refrigeration Institute to determine
seasonal efficiency in chilled water air conditioning
systems in large buildings – but now, claims Samsung,
also applicable to R410a refrigerant systems like DVM
Plus III, ‘which operates with full efficiency down to
10 per cent or even 1 per cent of capacity’.
DVM Plus III’s 64hp outdoor combination can,
says the company, serve up to 64 indoor units.
Combinations are built up from five basic units of 8,
10, 12, 14 and 16hp. Units have a footprint of 880mm The KX6 heat pump from Mitsubishi Heavy Industries Europe.
44 CIBSE Journal March 2010
www.cibsejournal.com
CIBSEmar10 pp43-44,46_Aircon.indd 44 25/2/10 16:10:43
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