Capacity Control Methods in Refrigeration- Engineering Lab Training Systems Description and Specifications for Lab Tenders
Capacity Control Methods in Refrigeration- Engineering Lab Training Systems.
Technical Description
This unit demonstrates
several possible ways of regulating the capacity. The cooling capacity
of the system with 2 separate evaporators can be changed by adjusting
the speed of the open compressor. The compressor drive motor is
controlled using a frequency converter. The evaporators are in
individual insulated compartments. In the first compartment the
temperature is regulated using an intake pressure controller and
thermostat (mechanical regulation), in the second compartment using a
case controller (electronic regulation). In both cooling compartments a
cooling load can be generated using an electrical heater. Fans ensure
even temperature distribution. A bypass capacity regulator is installed
in the refrigerant circuit that connects the high and low pressure sides
of the compressor. The system is equipped with temperature sensors at
all relevant measuring points. The signals provided by these sensors are
also used by the case controller.