User Indications; Refrigerant Fluid R744 In The Transcritical Regime Cycle; Unit Description - Epta Technica R744 Backup Unit Bedienungsanleitung

Model - Modello - Modèle
Modell
Manufacturer - Fabbricante - Constructeur
Hersteller
User manual
EN
EN
8.1 Refrigerant fluid R744 in the
IT
transcritical regime cycle
FR
The basic refrigeration cycle on R744 is
composed by
DE
compression,
expansion (inverse principle of compression,
this transformation occurs in the electronic or
thermostatic valve before the evaporator) and
evaporation.
The transcritical cycle is called that way because
the transformation of condensation occurs
above the critical point. When this happens we
can no longer call it condensation but gas-
cooling.
Working above the critical point pressure and
temperature are no longer unequivocally
determined,
temperature
pressures. In this case, the temperature at the
gas-cooler outlet is measured through which it
is possible to find the pressure which optimises
system performance (operation carried out
constantly by the controller).
The MEDIUM and LOW TEMPERATURE utilities
are served by the same liquid receiver; the
compressors of the LOW TEMPERATURE utility
discharge in suction to those of the MEDIUM
TEMPERATURE utility, with the consequent
presence of a single gas cooler.
Doc. n° UM000863 | Rev. "A" | 17/06/25
8.
four transformations:
condensation, lamination
this means that
may correspond
R744 BACKUP UNIT
Epta Spa - Via Mecenate, 86 - 20138 Milano (MI) ITALIA
Tel. 02/55403211 Telefax 02/55401023

USER INDICATIONS

8.2
The R744 backup unit is suitable as an auxiliary
cooling unit for the refrigeration unit: it is
activated in the event of a system shutdown to
ensure pressure in the liquid receiver remains
or
constant.
It uses the R744 refrigerant contained in the
liquid receiver itself for cooling.
STRUCTURE the base is made of sheet metal
(3mm) and steel casing (1,5mm)
COMPRESSOR hermetic rotary type
SPEED CONTROLLER for continuous regulation
of speed and consequently of the refrigerant
flow rate of compressors
a given
FAN axial type
to more
HEAT EXCHANGER finned type for oil cooling
OIL SEPARATOR
SAFETY VALVE (maximum permissible pressure
120bar)
PRESSURE TRANSDUCER, connected to the
speed regulator for controlling the outlet
pressure with an interval of 0–150bar
The general characteristics and the dimensions
are illustrated in the figures and in the sections
contained in "General description" (from pg.
"10" to pg. "12").
L
Refer to the documentation provided by
the
management of the various components
installed on the unit.

Unit Description

suppliers to ensure proper
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