4. Capacity and selection data
TCGB0075 rev.0 - 11/2012
72
a.ii) Use of auxiliary heating source (electric heater or boiler combination)
In installations which already have a conventional boiler (gas/oil), it can be used to alternate with YUTAKI S80 (Bi-valent
system) which it will help to increase the overall performance of the whole installation significantly.
Equally, if an additional heat load is required, an electric heater can be installed as accessory for the Mono-energy system.
In any case, the Procedure description explained before can be applied to all the energy systems mentioned but includ
-
ing a heat load check when using auxiliary heating source (Mono-energy or Bi-valent systems) and recalculating the new
heating points.
It will be checked that the combination (YUTAKI S80 + electric heater / boiler) covers the temporary needs in the coldest
days of the year.
Mono-energy and Bi-valent systems are usefull when there is a constant regular heating load and low periods of heating
load peaks related to the coldest days of the year.
N O T E
The following check can be used as well for the two combinations.
•
Step 1: Initial pre-selection
Proposed energy system
Mono-energy
Inlet/outlet water temperature
47/55 ºC
Regular ambient temperature WB/DB
(HR = 85%)
-5/-4 °C
Required regular heating load
9.0 kW
Ambient temperature WB/DB on the coldest
day of the year (HR = 85%)
-10/-9 ºC
Heating load required on the coldest day of
the year
13.0 kW
Installation restrictions
Installation type
Radiant floor
Power supply
1~ 230V 50Hz
Indoor unit lower than outdoor unit
15 m
Equivalent piping length between outdoor
and indoor unit
20 m
13.0 kW, -10 ºC WB
Capacity of
YUTAKI S80
Heating capacity
Outdoor ambient temperature
9.0 kW, -5 ºC WB
Heating load
demanded
In this new system the heat pump meets with the regular heating load. To reach the peak heating load of 13.0 kW (-10
ºC WB) necessary in the coldest days of the year the electric heater can provide the auxiliary heating capacity to cover it.