TCAEY-THAEY 115÷238 - Rhoss

TCAEY-THAEY 115÷238
general characteristics
AdaptiveFunction Plus
TCAEY-THAEY 115÷238 with control
The new AdaptiveFunction Plus adaptive regulation has been
excl usivel y patent ed by RHOSS S.p.A. It is the result of a long
partnership with the University of Padua. The various algorithm
devel opment operations were i mplement ed and validated on units in the
Compact-Y range in the RHOSS S.p.A. R esearc h&Dev elopment
Laborat ory using numerous tes t campaigns.
Objectives
• To guarantee optimal unit operation in the system in which it is
installed. Evolved adaptive logic.
• To obtain the best performance from a chiller in terms of energy
efficienc y at full and partial c apacities. Low consumption chiller.
Operating logic
In general, the actual control logics on water chillers/heat pumps do not
consider the characteristics of t he s ys tem in which t he units are
installed; they usuall y regul ate the ret urn wat er temperat ure and are
positioned so as to ensure the operation of the chillers, giving less
priority to the s ys tem requirements.
The new AdaptiveFunction Plus adaptive logic counters these logics
with the objective of optimising the chiller operation on the basis of the
syst em char acteristics and the ef fecti ve t hermal load. T he c ontr oller
regulates t he deli ver y water t emperature and adjusts itself, as and when
required, to the relative oper ating conditions usi ng:
• the i nfor mation c ont ained in the ret urn and deli ver y water
temperature to estimate the wor king conditions t hanks t o a c ertain
mathematical formula;
• a special adapti ve algorithm that us es this esti mate to vary the
val ues and t he st art-up and s witch- off limit values of t he c ompressors;
the opti mised compress or start-up management guar ant ees a pr ecision
wat er suppl y t o t he user, reduci ng the fluct uati on around the set- point
val ue.
Main functions
Efficiency or Precision
Thanks to the evolved control, it is possible to run the chiller on two
different regulation s etti ngs to obt ain t he bes t possible performance in
terms of energ y ef ficienc y and considerable seas onal savings, or high
wat er delivery temperat ure precision:
1. Low consumption chiller: Economy” option
It is well known that chillers wor k at full capacity for just a ver y small
percentage of t heir operating time, while they wor k at partial capacit y
for most of t he s eas on. Therefore, the power t hey need to s upply
generally diff ers from t he nominal design power, and oper ation at
partial capacit y has a notic eable effec t on seasonal energy
perfor manc e and consumpti on.
This makes it nec essar y t o run the unit s o t hat it is as efficient as
possible at partial c apacit y. T he c ontr oller therefore ensures that t he
wat er delivery temperat ure is as high as possible ( when operating as
a chiller) or as low as possible (when operating as a heat pump)
whilst c ompati ble with the t hermal loads, meani ng that it is on a
sliding scale, unlike in traditi onal s ystems. T his prevents energy
wast age linked t o t he mai ntenance of pointlessl y onerous
temperature levels for the chiller, ensuring that the ratio between the
power t o be supplied and the energy to be us ed t o produce it is
always at an optimum level. Fi nall y t he right level of comfort is
availabl e to everyone!
Summer season: a unit that oper ates wit h a
sliding set-point enables s easonal energy
savi ngs of around 8% c ompared t o a traditi onal
unit t hat operat es with a fi xed s et-point.
W inter season: a unit that operates wit h a
sliding set-point enables s easonal energy
savi ngs of around 13% compared to a
traditional unit t hat operat es with a fi xed s etpoint
. Calculations carried out demonstrate that
seasonal c ons umption is equi val ent to that of a
CLASS A mac hine.
Annual: efficienc y over the annual operation of
the unit i n heat pump mode.
AdaptiveFunction Plu s, with the “Economy”
function, enables the chiller assembly to
operate energy-saving programmes whilst still
providing the required level of service.
Y
900
800
700
600
500
400
300
200
100
0
3 4 5 6
X
7 8 9 10
Y
1600
1400
1200
1000
800
600
400
200
0
9 10 11 12 1 2 3
X
4
Y
6,0
5,5
5,0
4,5
4,0
3,5
3,0
2,5
2,0 1 2 3 4 5 6 7 8 9 10 11 12
X
X
Y
Year divi ded int o months
(1 Januar y, 2 Februar y, etc.).
Energy cons umption ( kWh).
Unit with fi xed Set-point
Unit with sliding Set-point
X
Y
Year divi ded int o months
(1 Januar y, 2 Februar y, etc.).
Energy cons umption ( kWh).
Unit with fi xed Set-point
Unit with sliding Set-point
X
Y
Year divi ded int o months
(1 Januar y, 2 Februar y, etc.).
Energy efficienc y
kWh s upplied / kWh absorbed.
Unit with fi xed Set-point
Unit with sliding Set-point
Analysis performed by comparing the operation of a Compact-Y heat pump unit with AdaptiveFunction Plus logic that operates with a fixed set-point (7°C in the summer and
45°C in the winter) or with a sliding set-point (range between 7 and 14 °C in the summer, range between 35 and 45°C in the winter) for an office building in Milan.
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