Block Diagram For Temperature Control In A Refrigerator

Block diagram of feedback control loop. One key section of a temperature controller is the adjustable bi directional current source. Draw a block diagram of the components for temperature control in a refrigerator or automobile air conditioning system.

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Block diagram for temperature control in a refrigerator. It can also be known as the output stage. Closed loop control system feedback is present block diagram. Types of control system. Discover st s solutions and ics for smarter refrigerator and freezer designs including motor control power management microcontrollers sensors and wired wireless connectivity.

The sensing bulb of the control should be mounted so that it senses the evaporator inlet air. During the off cycle the constant fan recirculates the air in the box. Temperature controller current source. Sensor r s u s actuator process y s flow disturbance d s feedback controller figure 4.

Refrigerator block diagram solutions stmicroelectronics. Depending on feedback it is divided into two types 1. Temperature sensor lm35 2. 6 temperature control device or thermostat.

The temperature of the air becomes an average of the product temperature the wall temperature any infiltrated air and any other loads such as caused by a person entering the box. To control the temperature inside the refrigerator there is the thermostat whose sensor is connected to the evaporator. The thermostat setting can be done by the round knob inside the refrigerator compartment. Walkthrough for chapter 1 problem 5p walkthrough video for this problem.

This section responds to the control system section by driving current to the temperature actuator thermoelectric or resistive heater. Open loop control system feedback is not present 2. Now we ll learn how to make a closed loop temperature control system. In this block diagram classical pid controller is used as the controller.

The block diagram of a closed loop feedback control setup of heat exchanger system is shown in fig. The refrigeration system is designed so that the refrigerant will evaporate in the evaporator at a temperature that s about 10 to 15 below the temperature setting if it s a refrigerator or freezer and the temperature will drop to around 0 in the evaporator of an ice machine or ice cream machine.