Write the importance of food preservation. What are the causes of food spoilage?
Enlist the methods of food freezing.
What are the basic elements of controlling of air conditioning?
2.0 m³/s of moist air at a state of 30°C DBT, 21°C WBT and 101.325 kPa flows across a cooler coil and leaves the coil at 12°C DBT and 8.2 g/kg of dry air. Determine i) the apparatus dew point ii) the contact factor and by-pass factor iii) cooling load.
What are the causes of spoilage of food? Why it need to preserve? Explain.
What are the basic elements of controlling of air conditioning? Discuss their functions.
Briefly discuss the acoustic design in building air conditioning.
Define air-conditioning and refrigeration. Write the history of refrigeration.
Discuss briefly the frozen food chain in the global with sketches.
We have to design a cold storage with a temperature -5°C while the surrounding temperature is maintained at 34°C. Heat will be transferred from the hot surrounding into the cold storage room amount is to be 25 kW. The COP of the refrigerating plant is 1/3 of an ideal plant. Calculate the power required to drive the plant.
Why do foods become spoilage? Explain
Write down the working principle of thermostatic expansion valve with neat sketch.
Differentiate among frosting evaporator, non-frosting evaporator and de-frosting evaporator. Also write the advantages of food preservation.
Define 1st law and 2nd law of thermodynamics. What are their applications in the field of Refrigeration system?
State Joule's law. Write the equation of Joule's law.
A cold storage is to be maintained at -5°C while the surroundings are at 35°C. The heat transfer from the surrounding into the cold storage is estimated to be 29 kW. The COP of the refrigeration plant is one-third of an ideal plant. Find the power required to drive the plant.
What are the factors to be kept in mind while storing the foods in cold storages? Explain in brief.
A cooler 4 m×3 m×3 m high equipped with 6 m×0.7 m×1 m triple-glass doors is used for general purposes storage in a grocery store. The cooler is maintained at 2°C and the service load is heavy. The walls are insulated with the equivalent of 100 mm of corkboard and the ambient temperature is 25°C. Determine the cooling load in kW based on a 16 hr operating time.