Envicool EMW90HDNC1A - 2.1.2 Functionality; 2.2 System Principle and Control Logic

User Manual
2 Product Description
EMW90HDNC1A Air-cooled Chiller
7
Feature
Description
Energy
efficient

The high-efficiency controller is
used to control the cooling
output on demand to achieve
the best cooling and lowest
energy consumption.

Equipped with frequency
conversion compressor and
frequency conversion water
pump to realize double
frequency conversion
adjustment of cooling system
and coolant circulation system.
2.1.2 Function Description
Smart Refrigeration / Heating
The EMW90HDNC1A chiller is equipped with
high-efficiency controller, and supports a field
communicator to visually set control parameters,
which is easy to operate.
The controller monitors the coolant outlet
temperature (the control temperature type is
configurable) in real time, and intelligently adjusts
it according to the target temperature setting, so
that the battery operating temperature in the
container is stabilized within an appropriate
range.

When the coolant outlet temperature is higher
than the refrigeration set point and the
refrigeration start condition is met at the same
time, the chiller starts cooling and chooses to
output different refrigeration capacity
according to the actual temperature.

When the coolant outlet temperature is lower
than the refrigeration set point, the chiller
saves energy by turning off the compressor
and reducing the speed of the circulating
pump.

When the coolant outlet temperature is lower
than the heating set point and the heating start
condition is met at the same time, the chiller
will start electric heater.
RS485 / CAN Communication
The EMW90HDNC1A chillers communicate with
the host computer through the RS485 or CAN
(Controller Area Network) interface using Modbus
or CAN protocol. By sending request messages,
the host computer can perform operations such
as remote start-up and shutdown, query the
operating status of the chiller and set control
parameters to realize remote monitoring of the
chiller.
Power-off Memory and Self-start
After the chiller is powered off, it can memorize
the settings before power off, and it can
automatically and intelligently run according to
the memorized settings after the power is turned
on again.
2.2 Implement
2.2.1 System Principle
The EMW series chiller is composed of a
refrigeration cycle system and a coolant cycle
system, and the system principle is shown in
Figure 2-2.
Figure 2-2 Chiller composition structure
1
2
3
4
5
7
6
From the load side
To the load side
1: Compressor
2: Condenser
3: Condenser fan
4: Throttle element
5: Plate heat
exchanger
6: Circulation pump
7: Electrical heater
The working process of EMW series air-cooled
chillers is as follows:
1. When the outlet coolant temperature reaches
the refrigeration opening point, the
compressor starts to compress the gaseous
refrigerant.
The chiller supports the execution of
temperature control logic based on the outlet
coolant temperature and the cell temperature
sent by the host computer.
2. The condenser condenses the
high-temperature refrigerant, and the
refrigerant changes from a gaseous state to
a liquid state.
3. The fan sucks in the outside air and
discharges the heat released when the
refrigerant condenses to the surrounding air.
4. The throttling element (electronic expansion
valve) throttles and depressurizes the
condensed refrigerant.