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MVW01 WC (WATER COOLED)
6.4.5 Three-Way Valve
The 3-way valve is located in the primary circuit and it is used for controlling the temperature of the coolant fluid and avoiding condensation
inside the panel, according to the combination of parameters measured by the system (fluid, environmental, and moisture temperatures) the
valve is controlled in such a way as to keep a small difference in temperature measured to avoid condensation.
6.4.6 Centrifugal Pump
The centrifugal pump is responsible for supplying a continual flow of coolant fluid in the primary circuit. It supplies enough mechanical energy
so that the flow complies with the required parameters of the project.
6.4.7 Over Pressure Valve
The over pressure valve is activated when, due to a system fault, the system pressure exceeds the adjusted value. In these cases, it lets the
fluid drain outside the primary circuit, thus preventing the pressure from increasing and damaging any component. The adjustment range is
from 0.5 to 10 bar. In the MVW01, it is adjusted to 6 bar.
6.4.8 Automatic Degasser Valve
6
The automatic degasser valve allows the release of the existing air from the primary circuit. Its working priciple is based on a sphere that is less
dense than the refrigerant fluid and denser than the air, whereas, the presence of a significant amount of air makes the sphere move down by
gravity, allowing the air to flow and thus discharging it from the circuit. When only coolant fluid is present, the valve remains closed. It is an
automatic valve, installed vertically at the highest place in the circuit.
6.4.9 Expansion Tank
The membrane in the expansion tank prevents severe pressure variations while the equipment is operating, to prevent possible damages to the
components. The expansion tank is composed of two sections, separated by a membrane, whereas one of the sides is filled by compressed
air pre-loaded at 2 bar, and the other side is filled with coolant fluid from the primary circuit. If there is an increase in the pressure in the circuit,
as the coolant fluid is incompressible, it will occupy a larger volume than the expansion tank and the air (compressible) in the other section, so
it will be reduced in volume. Desta forma, a indesejável pressão elevada será amenizada pelo tanque de expansão.
6.4.10 Leakage Sensor
Located on the lowest part of the RSW, it is a sensor that, on the presence of liquid, triggers a signal for alarm and changes the LED color from
green to red.
6.5 INSTALLATION SPECIFICATIONS
6.5.1 Coolant Fluid
The quality specifications of the coolant fluid in the primary circuit must comply with the properties in
Table 6.1 on page 6-7
. The fluid must not
contain any organic sediments or active chemical agents. The fluid must contain a corrosion inhibitor appropriate for PVCC pipes and EPDM
sealants.
A filter must be used while filling the primary circuit tubes, in order to prevent the entrance of particles larger than 0.3 mm.
The temperature of the coolant fluid must never be under the environmental temperature of the panel and components, in order to avoid any
risks of the fluid condensation. Up to 20% of glycol ethylene can be added to the fluid in order to lower the fusion point of the fluid and avoid
the fluid freezing. This percentage reduces the specific heat of the fluid and the capacity for heat exchange in the system.
Fluid: Demineralized water with a corrosion inhibitor and Glycol ethylene.
MVW01 | 6-6
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