Total Heat Recovery - AERMEC NRA 0800 Manual Tecnico

When operating with the total heat
recovery function, machine performan-
ce depends on the temperature of the
hot water produced, not on that of
external air; to calculate the absorbed
electrical and heat recovery power
values, multiply the values (Pa, Pr) spe-
cified at the bottom of the page by the
relevant correction factors (Ca, Cr)
derived from the diagrams below. The
temperature of the relative hot water
is given for each curve (a difference
of 5°C between total heat recovery
unit input and output is presumed).
Calculate the cooling power (Pf) by
measuring the difference between
heat recovery power (Pr) and power
absorbed (Pa).
NOTA
In heat pumps total recovery is only available
for the "OO versions without hydronic kit"
The heating capacity available to the
total heat recovery is in rated condi-
tions:
Air temperature
Water produced
∆t
13. 1 PRESSURE DROPS
All NRA models with total recovery are
equipped with ONE recoveries. Heat
recovery unit specifications and load
loss curves are given below. The pres-
sure drops you see in the table do not
include the filter drop, whose curve is
indicated.
NOTE
The parallel water connections is to be
made by the installer
The pressure drops in the charts
above refer to an average water tem-
perature of 50 °C. The following table
shows the corrections to apply to the
pressure drops with a variation in ave-
rage water temperature.
TOTAL RECOVERY
13
(Cr)
LEGENDA
Cr Coefficiente correttivo potenza recuperata
Ca Coefficiente correttivo potenza assorbita
35 °C
Taglie
50 °C
PTR kW
5 °C
P o t e n z a
kW
assorbita
P o r t a t a
m 3 /h
acqua
Perdit a di
kPa
carico
kPa
Values different from the nominal value
Average water temperature °C
Multiplicative coefficient
Temperatura dell'acqua refrigerata prodotta (∆t=5°C)
0800 0900 1000 1250
290 324 357 435
73 81 89 109
50 55.7 61.4 74.8
7 9 9 10
Water flow rate m3/h
30
1.04
(Ca)
1400 1500 1650 1800
485 534 591 654
121 133 157 174
83.4 92.0 101 112
10 9.6 13 18
40 50
1.02 1
25