Selection and installation of the expansion valve for recirculating chillers

Regarding today’s topic, we have the
following analysis.

The selection of expansion valve plays an
important role in the performance of the recirculating chiller refrigeration
system. The correct choice of expansion valve will maximize the use of the evaporator
and make the evaporator always be matched to the heat load.

First, the selection of thermal
expansion valve.

In the recirculating chiller refrigeration
system, the selection and installation of the expansion valve is very
important. Only the correct selection and installation can ensure the normal
operation of the unit. Therefore, when selecting the expansion valve, we can
use the appropriate size of the thermal expansion valve according to the size
of the evaporator load and the evaporating temperature. The capacity of the
commonly used expansion valve is about 20% larger than the evaporator heat
load. For small chiller refrigeration systems, gas-filled thermal expansion
valves are generally used, and medium-sized recirculating chiller refrigeration
systems mostly use adsorption-filled or mixed-filled expansion valves.

Second, the expansion valve
installation.

1. The chiller expansion valve is installed
in front of the evaporator and is usually installed in a vertical position.
Considering the ease of installation and maintenance, the cooling loss is small
and should be as close as possible to the inlet of the evaporator.

2. The working
condition of the expansion valve for the recirculating chiller has a direct
relationship with the installation position of the temperature sensing package.
Because the expansion valve completely adjusts the opening size of the
expansion valve by the temperature change of the temperature sensing package.
The temperature sensor package is installed on the pipe at the outlet of the
chiller evaporator. As the evaporator outlet pipe grows, its superheat
gradually increases. Therefore, the position of the expansion valve temperature
sensing package is directly related to the amount of fluid supplied from the
expansion valve.

We, LNEYA, have been engaged in the
manufacturing and R&D of industrial refrigeration, heating and temperature
control equipment for 15 years and have experienced designers and equipment
maintenance personnel. The selection and installation of the expansion valve of
the recirculation chiller can be said to be very complete, which not only
reduces the failure rate of the equipment, but also allows users to avoid loss
of production capacity during use. If you have any questions or needs regarding
recirculation chillers, you can contact us at sales@cnzlj.com.