AERMEC NRL 280-75, Техническое руководство

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22 Aermec 13_01. 5641300_00
NRL 0280-0750 60Hz
EN
10.2. HEATING CAPACITY AND INPUT
POWER
− "HEAT PUMP VERSIONS"
The heating capacity efficiency and electrical
input power in conditions differing from normal
conditions are obtained by multiplying the nomi-
nal values (Pt, Pa) by the respective coefficient
correctives (Ct, Ca).
The following diagram shows how to obtain cor-
rective coefficients; the produced hot water tem-
perature, to which reference is made, is shown in
correspondence to each curve, assuming a water
temperature difference equal to 5°C between the
condenser inlet and outlet.
The yields are intended net of de-frosting cycles.
KEY:
Ca: Corrective co-efficient of the
input power.
Ct: Corrective co-efficient of the
heating capacity.
Ca in hea
ting
-15 -12 -9 -6 -3 0 3 6 9 12 15 18 21 24 27 30
°C
5 10 15,8 21,2 26,6 32 37,4 42,8 48,2 53,6 59 64,4 69,8 75,2 80,6 86
°F
7
44,6
77
86
95
104
113
131
°F
122
0.5
0.6
0.7
0.8
0.9
1.1
1.2
1.3
1.0
25
30
35
40
45
55
°C
50
External air temperature
INPUT POWER IN HEATING MODE CORRECTIVE COEFFICIENTS
Ct
0.5
0.6
0.7
0.8
0.9
1.1
1.2
1.3
1.4
-15 -12 -9 -6 -3 0 3
6
9 12
25
°C °F
30
35
40
45
55
50
77
86
95
104
113
131
122
15 18 21 24 27 30
°C
5 10 15,8 21,2 26,6 32 37,4
42,8
48,2 53,6 59 64,4 69,8 75,2 80,6 86
°F
1.0
7
44,6
External air temperature
HEATING CAPACITY CORRECTIVE COEFFICIENTS
FOR ∆ t DIFFERENT TO THE NOMINAL
FROM 10.01°F / 5.56°C.
For ∆ t different from 10.01°F / 5.56°C at the evaporator
use Tab. 10.3.1. to obtain the correction factors of the
cooling capacity and input power. In order to consider
exchanger dirtying, use the relative dirtying factors
Tab.10.4.1.
10.3. FOR ∆ T DIFFERENT TO THE
NOMINAL
The performances given by the technical data
refer to AHRI standard conditions: flow rate
0.043l/s per kW (
Δ t 10.01°F / 5.56°C).
Use table to obtain the corrective factors of the
cooling capacity and input power different than
Δ t 10.01°F / 5.56°C.
Δ T DIFFFERENT FROM THE RATED
VALUE ( Δ T 5°C_10.01°F)
3°C/5,40°F 5,56°C/10,01°F 8°C/14,40°F 10°C/18°F
Cooling capacity correction factors 0,99 1 1,02 1,03
Input power correction factors 0,99 1 1,01 1,02
10.3.1. CORRECTIVE FACTORS AT ∆ T DIFFERENT FROM THE CHILLER NOMINAL
FOULING FACTOR [K*M2]/[KW] 0,018 0,05 0,1
Cooling capacity correction factors 1 0,987 0,967
Input power correction factors 1 0,987 0,967
10.4. DEPOSIT FACTORS
The performances shown by the table refer to
clean tubes with deposit factor=1.
For different deposit factor values, multiply
the data in the performance tables by the co-
efficients given.
10.4.1. DEPOSIT FACTORS