Basic Mechanical Engineering 312006 Practical No 17 Answers
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| Basic Mechanical Engineering 312006 Manual |
Practical No.17: Demonstrate the working of the Household Refrigerator to identify different components and type
Practical Significance
A household refrigerator is an appliance that is used for the short-term preservation of food
products in the home by means of refrigeration. A domestic refrigerator is a metal cabinet with
a built-in hermetically sealed refrigerating unit when the hot gas in the coils of the condenser
meets the cooler air temperature of the kitchen, it becomes a liquid. Now in liquid form at
high pressure, the refrigerant cools down as it flows through the expansion valve into the
evaporator coils inside the freezer and the fridge.
Procedure
1. Identify and locate the components.
2. Locate the refrigerant tubes connecting different parts and trace the path of the refrigerant.
3. Observe and trace the path of the refrigerant.
Observations and calculations
| Component | Function | Type |
|---|---|---|
| Compressor | Increases the pressure and temperature of the refrigerant. | Electric motor-driven pump |
| Condenser | Releases heat from the high-pressure, high-temperature refrigerant to the surrounding environment. | Finned coil, usually located on the back of the refrigerator. |
| Evaporator | Absorbs heat from the inside of the refrigerator, causing the refrigerant to evaporate and cool. | Finned coil, located inside the refrigerator compartment. |
| Thermostat | Senses and regulates the temperature inside the refrigerator, turning the compressor on and off as needed. | Bimetallic strip or electronic sensor |
| Expansion Valve (or Throttling Valve) | Reduces the pressure and temperature of the high-pressure liquid refrigerant before it enters the evaporator. | Capillary tube or thermost |
Practical Related Questions
1. Draw a layout of household refrigerator on graph paper
Answer:
2. Collect the names of Indian manufacturers of household refrigerators along with their range of capacity in TR.
Answer:
- Godrej: Capacity range: ~190 liters to 650 liters
- LG: Capacity range: ~180 liters to 600 liters and above
- Samsung: Capacity range: ~190 liters to 700 liters and above
- Whirlpool: Capacity range: ~170 liters to 600 liters and more
- Haier: Capacity range: ~190 liters to 600 liters and more
3. Select the capacity of the refrigerator for a. medical store b. Small pan shop c. Hotel
Answer :
a. Medical Store:
Capacity: 200 liters to 400 liters
b. Small Pan Shop:
Capacity: 100 liters to 200 liters
c. Hotel:
Capacity:
Mini-fridge for individual rooms: 40 liters to 100 liters
Larger refrigerator for common areas: 300 liters to 600 liters and above.