Practical Note Book

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GGS COLLEGE OF MODERN TECHNOLOGY KHARAR RAC LAB

RAC LAB

EXPERIMENT:-1 Aim : - Study of various elements of a Mechanica l Refr igera to r system through cmodels / actual apparatus

Theory :-

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STUDENT SIGN FACULTYSIGNViva Voce Question:

1. What is the funct ion of Capil la ry Tube?2. What is the function of Thermostat?

3. Which material is used in the manufacturing of refrigerator parts?

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EXPERIMENT:-2

Aim : - Study and performance of domesti c ref r ige ra to r

Theory :-

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Procedure : -

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Calculat ions:-

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Drawings :-

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STUDENT SIGN FACULTYSIGN

Viva Voce Question:1. What is COP of a Refrigerator?2. Which gas used in Domestic Refrigerators?3. What is the function of a compressor?

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Working :-

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Procedure :-

Drawing :-

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Calculat ions:- The coefficient of Performance of Refrigerator is given by

COP = Heat absorbed in the Evaporator

Heat supplied in the GeneratorVapor Absorption Refrigeration Unit:-COP = TE * TG-TA

(TC- TE) TGWhere TE=Temp of Evaporator

TC=Condenser TemperatureTG=Generator TemperatureTA=Ambient Temperature

Temperatures in Kelvin k

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Viva Voce Question:1. What is the di f f erence between Vapor absorpt ion and Vapor

compression?2. Why Ammonia is used in Electrolux Refrigerator?3. Which is better Vapor absorption or Vapor compression?

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EXPERIMENT:-4

Aim : - Study of an Ice plant and vis i t to a Cold storage for study.

During the visit the students will study the following components/parameters in the ice plant/coldstorage:

1. Construction of the main components of refrigerating systems.2. Draw a detailed block diagram of the plant.3. Note down the capacity of each unit i.e. evaporator, compressor, condenser etc.4. Type of evaporato r , condenser , compressor , expansion val ves , contro l valves and mat

construction.5. Name of refrigerants primary and secondary and flow rates.6. Temperature and pressures in evaporators and condensers.7. Comparison between theoretical and actual COP of the system.8. Capacity control of the plant under various load conditions.9. Types of insulation materials used.10. Suggest various methods to improve plant performance.11. Comparison between ice plant and cold storage.

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Drawings :-

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STUDENT SIGN FACULTY SIGN

Viva Voce Question:1. Which type of Condenser is used in an Ice Plant?2. What is the function of Brine Solution?3. Which Refrigerant is used in an Ice Plant?

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EXPERIMENT:-5

Aim : - Calculat ion/ Estimation of cooli ng load for large build ing.

Theory

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EXPERIMENT:-6

Aim : - Visit to a central Air condit ion ing plant for study of processes for wintsummer ai r condit i on ing .

During the visit the students will study the following components/parametersin central air conditioning plant.

1. Draw a detailed block diagram of the plant.2. Construction of the main components of air conditioning systems.

3. Note down the capacity of each unit i.e. evaporator coil, compressor condenser etc.4. Type of evaporator, condenser, compressor, expansion valves, control valves and material used inconstruction.

5. Name of refrigerant and flow rates.6. Temperature and pressure variation in evaporators and condensers.7. Comparison between theoretical and actual COP of the system.8. Capacity control of the plant under various load conditions in summer and winter.9. Types of insulation materials used.10. Suggest various methods to improve plant performance

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Drawings :-

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EXPERIMENT:-7

Aim : - Study and performance of window type room ai r condi t ioner

Theory :-

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Drawing

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Procedure

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Calculat ions:-COP =H1-H4

H2-H1

Compressor outle t = H2Evaporator out le t = H1Evaporator in le t = H4

Power Consumed by Compressor = VxI

OBSERVATION TABLE:-

Take the di f fe ren t pressures and temperature read ings: -

Sl . No. P1 P2 T1 T2 T3 T4 T5 T6

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STUDENT SIGN FACULTYSIGNViva Voce Question:1. Which type of Gas is used in an Air Condit ioner?2. What is Air Condit ion ing?

3. What is Dalton s Law?

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