RHOSS Compact-Y SM TCAEY 122 P0 Instrucciones De Uso página 23

Annual: efficiency over the annual operation of the unit in heat pump
mode.
AdaptiveFunction Plus, with the "Economy" function, enables the
chiller assembly to operate energy-saving programmes whilst still
providing the required level of comfort.
Y
6,0
5,5
5,0
4,5
4,0
3,5
3,0
2,5
2,0
1
2 3
4
5
The Seasonal Efficiency Index PLUS
The University of Padua has developed the seasonal efficiency index ESEER+, which takes the adaptation of the chiller set-points to different partial
load conditions into account. This, therefore, characterises the seasonal behaviour of the chiller with Adaptive Function Plus compared to the more
traditional ESEER index
The ESEER+ index can therefore be used for a quick evaluation of seasonal energy consumption of units with Adaptive Function Plus, instead of
more complex analyses conducted on the plant-system which are usually difficult to complete.
Simplified method for calculating energy saving with Adaptive Function Plus
The dynamic analyses used to calculate the energy consumption of chillers in a building/system are generally too elaborate to be used for a quick
comparison of different refrigerant units, inasmuch as they require a range of data that is not always available.
For a quick estimate of what the energy savings could be with a unit equipped with Adaptive Function Plus software compared to a machine with
traditional control, we suggest using a simplified method based on the following formulae:
E
N
C
ESEER+
Therefore in two units at the same nominal cooling capacity and the same number of working hours but equipped with different controls, the higher the
absorbed power the lower the seasonal efficiency. In order to simplify matters, here is an example comparing a traditional control Rhoss unit to one with
Adaptive Function Plus control:
6
7
8
9
10
11
12
X
E=
power absorbed by chiller equipped with Adaptive Function Plus software (kWh)
number of chiller operating hours
nominal cooling capacity of the chiller (kW)
average seasonal efficiency of the chiller equipped with Adaptive Function Plus software
E=
E
power absorbed by chiller equipped with traditional contro(kWh)
N
number of chiller operating hours
C
nominal cooling capacity of the chiller (kW)
ESEER
(European seasonal EER) Average European seasonal efficiency
X
Year divided into months (1 January, 2 February, etc.).
Y
Energy efficiency kWh supplied / kWh absorbed.
Unit with fixed 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.
0.54 x N x C
ESEER+
0.54 x N x C
ESEER
23
Compact-Y SM