Asst Prof Department of Mechanical Engineering Knowledge Institute

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Asst. Prof. Department of Mechanical Engineering. Knowledge Institute of Technology, Salem.

Asst. Prof. Department of Mechanical Engineering. Knowledge Institute of Technology, Salem.

� Need of Refrigeration system � Working of Refrigeration system � Video link �

� Need of Refrigeration system � Working of Refrigeration system � Video link � Reflection Question 1 � Answer for Q 1 � Reflection Question 2 � Answer for Q 2

� If we need reduce the temperature of any object below the surrounding temperature,

� If we need reduce the temperature of any object below the surrounding temperature, the external source is essential. � Refrigeration has many applications, including, but not limited to: household refrigerators, industrial freezers, cryogenics, and air conditioning.

� In refrigeration system there are four major components, �Compressor �Condenser �Expansion valve �Evaporator

� In refrigeration system there are four major components, �Compressor �Condenser �Expansion valve �Evaporator � From compressor the high pr vapour, sent to condenser.

� In condenser, condenser the high pr vapour gets condensed to convert the vapour

� In condenser, condenser the high pr vapour gets condensed to convert the vapour into liquid. � The high pr partial liquid from condenser is the input of expansion valve. � Expansion valve is used to regulate the flow of refrigerant and for phase change of refrigerant. � From expansion valve, the high pr liquid refrigerant is the input of evaporator. � Evaporator is component which is having the thinks to reduce the temperature. � From evaporator low pr vapour refrigerant will comeout.

� https: //nptel. ac. in/courses/112107208/2

� https: //nptel. ac. in/courses/112107208/2

� In the above video at time 1. 30, the Prof. explained about refrigeration

� In the above video at time 1. 30, the Prof. explained about refrigeration with example of tea cup, � Question 1 �In : this temperature of the tea cup is 80 C and surrounding is 30 C. if you keep the tea cup for few minutes the temperature of tea cup came to equal of surrounding temperature without any sources. how we can call this process interms of heat transfer.

�Natural convection.

�Natural convection.

� If above process called as Natural convection means, here what is the role

� If above process called as Natural convection means, here what is the role of refrigeration?

� The temperature of the tea cup and surrounding temperature is equal that heat

� The temperature of the tea cup and surrounding temperature is equal that heat transfer called as convection heat transfer. � if we want to reduce the temperature of the tea cup below surrounding temperature, need external source or device is called refrigeration system.

THANK YOU

THANK YOU

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