Manual selection, installation and maintenance
16
Roof-top units -
RTE series
-
0,8
1
0,85
0,9
0,95
1,05
1,1
1,15
1,2
Ca
0,5
0,6
0,7
0,8
0,9
1
1,1
1,2
-8
-6
-4
-2
0
2
4
6
8
10
12
14
16
°C
Ct
Te = 16 °C
Te = 20 °C
Te = 24 °C
Te = 20 °C
Te = 24 °C
Te = 16 °C
Pt [kW]
Pa [kW]
d.b. External air
KEY
Pt Cooling
Capacity
Pa
Absorbed power fan excluded
Ct
Corrective coefficient for cooling capacity
Ca
Corrective coefficient for heanting capacity
b.s. Dry
bulb
Te
d.b. temperature of the air to be treated
Variation of the total performances on the RTE units as
the relative humidity varies maintaining the dry bulb tem-
perature constan
t
Variations of the sensible capacities on the RTE units as
the relative humidity varies keeping the dry bulb tempe-
rature constant:
In the heat pump performance table the y-axis shows a temperature that refers to the following table
The heating capacity and the absorbed electric power in
conditions either than the nominal ones, can be obtai-
ned by multiplying the nominal values (Pt, Pa) with their
respective correction factors (Ct, Ca).
The following diagram makes it possible to obtain the
corrective co-efficients; indicated next to is the outside
temperature with dry bulb with variable relative humidity
, in accordance with the data shown in the table below.
Capacities do not include defrosting periods.
TABLE2 CORRECTIVE COEFFICIENTS FOR HEATING
CAPACITY AND ABSORBED POWER FOR H
VERSION
WA R N I N G
Reductions in the outdoor unit air flow are not
permitted in heat pump operation.
Temp. on y axis
°C
-8
-6
-4
-2
0
2
4
6
8
10
12
14
16
Temp. B.S. D.B. Temp. °C °C
-8
-6
-4
-2
0
2
4
6
8
10
12
14
16
Umid. Rel. Rel. Humid.
%
90
90
85
80
75
75
70
70
70
65
65
65
65
Example: if RTE090F supplies 22,0 kW tot. cooling cap.
and 16,5 kW sensible cool. cap. at 27°C and 50% R.H.;
Then at 27°C and 40% R.H. it will supply respectively:
22,0x0,94=20,7 kW and 16,5x1,11=18,3 kW.
VARIABLE RELATIVE HUMIDITY
U.R.
%
30 40 50 60 70
Coef. corr (°C) 1.23 1.11 1.00 0.89 0.79
VARIABLE RELATIVE HUMIDITY
U.R.
%
30 40 50 60 70
Coef. corr (°C) 0.89 0.94 1.00 1.06 1.12
Thermal capacity and total input power
