Hitecsa EWMIG 236 Manuel D'installation, D'utilisation Et D'entretien page 41

Chiller or heat pump set-up with DS or RC100
Chiller
With this type of system, the main hydraulic circuit of the chiller is connected to the user and produces cold water for air conditioning. The unit can be
set-up as a pump or pump and storage tank as alternative to the traditional solution seen installed in the system. The desuperheater (DS), with which
the machine can be supplied, will be connected by means of a technical water storage tank and external pump for DHW or to the system to produce hot
water for the post-heating coils of the CTA or other applications. RC100 total recovery, as an alternative to DS, can be used in the same applications,
however, the amount of heat produced is significantly higher and, at the same time, the heat level of the water produced is lower.
Heat pump with partial recovery (DS) - 2-Pipe+DHW system
Should the unit be a reversible heat pump, summer operation is the same as the aforementioned situation of the chiller. Instead, with winter operation,
the user has DHW produced from the heat pump. If the unit is equipped with a DS desuperheater, this can be also active in winter mode. However, in
this case, this value is deducted from the portion of heat from the hot water produced from the main heat exchanger.
Heat pump with total recovery (RC100) - 2-Pipe+DHW system
If the unit is a reversible heat pump fitted with total recovery (RC100), the behaviour is identical to a Polyvalent 2-pipe unit with specific application in
2- pipe+DHW systems.
Air conditioning and the DHW production in a 2-pipe system is a typical application in hotels, hospitals, gyms and hospitality structures in general.
The 2-pipe+DHW systems provide summer mode with the production of chilled water and/or simultaneous or separate production of hot water from the
heat recovery unit. In winter, however, the demand is for hot water production from the main heat exchanger and alternatively (assigning appropriate
priority) from the recovery exchanger.
The unit can run in two modes:
•
AUTOMATIC: the system allows total recovery of the condensation heat and/or the production of chilled water (summer season)
•
SELECT: this allows the production of hot water to the recovery heat exchanger or from the main one (winter season)
Summer season "AUTOMATIC"
Domestic
Hot water
II.6.7.1.1 Competitive advantages
The heat pump unit with total recovery, defined as 2-pipe Polyvalent, fulfils the simultaneous or separate request for hot and cold water with one single
unit, thereby optimising energy consumption and simplifying management in the 2-pipe+DHW systems.
○
Its natural application and as a valid alternative in all conventional systems that require a chiller or heat pump with the use or integration of a
boiler.
○
The advantages are due to a single unit being used, the economic saving due to the high COP (operating with heat recovery in summer mode),
the non-use of combustible products that are harmful to the ozone so as to be defined as an ecological polyvalent unit.
○
Fourth generation polyvalent versatile heat pump, which unlike other polyvalent units meets the typical demand in 2-pipe systems with a single
unit and in a completely flexible way.
○
It is therefore offered on the market as the unit that guarantees fundamental aspects such as EFFICIENCY, RELIABILITY AND VERSATILITY.
Technical data DS – RC100
Model EWMIG
Nominal heating capacity RC100 (1)
Nominal flow rate/pressure drop RC100 (1)
Nominal heating capacity DS (1)
Nominal flow rate/pressure drop DS (1)
(1) Recovery unit heating capacity Conditions referring to the unit operating with chilled water temperature 7°C, differential temperature due to
evaporation of 5 K, hot water temperature produced equivalent to 40/45°C (RC100) 50/60°C (DS). NB. With heat pumps operating in winter mode with
DC active, the heating capacity available is decreased from the portion supplied to the desuperheater.
Air Conditioning
Cold water
kW
3
m /h / kPa
kW
3
m /h / kPa
Winter season "SELECT"
Domesitc or Air Conditioning
Hot water
236 245
40,1 54
1,3 / 12 1,7 / 12
14,6 19,4
6,9 / 45 9,3 / 46
43
SECTION I: USER
250 260
63 69,8
1,8 / 16 2,1 / 16
20,6 24,2
10,8 / 49 12 / 46