Storage Engineering — Summer 2022

What is cooling load?

What are important aspects to be considered during design and construction of Storage Structure

Discuss in detail the different types of modern food grain storage structure

What is angle of internal friction?

What is the need for controlled atmosphere storage?

Design a bag storage structures for storing 300 tonnes of paddy. Assume reasonable data wherever necessary.

Calculate the total cooling load from the following information: Mass of Potato to be stored: 1500 Mt Loading rate: 4% of the total storage capacity/day Product temperature at the time of loading = 20 0C Outside Dry Bulb Temperature: 40 0C Out Side RH: 50% Inside Dry Bulb Temperature: 2 0C Inside RH: 95% Volume of cold room: 20.8 m x 16.625 m x 14.0 m Density of air: 1.12 kg/m3 Air change factor, z = 2.65 Enthalpy of air at 40 0C DBT and 50% RH= 105 kJ/kg Enthalpy of air at 2 0C DBT and 95% RH= 15 kJ/kg Specific heat of potato: 3.6 kJ/kg K kJ Heat of Respiration of potato = 0.0325 kg.h 3 number of occupants each working in cold storage for 10 hours/day 10 lamp of 18 Weach lighting for 2 hours/day in cold storage room

What is passive MAP?

What are advantages of aeration?

Astorage structure having smooth wall used for storing rice has diameter of 2.5 m and height 25 m. The characteristics of stored rice are as follows: Minimum bulk density : 720 kg/m3 Maximum bulk density: 830 kg/m3 Minimum angle of internal friction (φ): 25º Maximum angle of internal friction: 30º Minimum angle of friction on smooth wall (φ’): 180 Angle of repose: 250 Calculate the load on the bottom, and the lateral pressure thrust at 10 m.1

Write five general arrangements and considerations for design of cold storage.

Differentiate between shallow and deep bins.

Classify different storage structure on the basis of a. Duration of Storage b. Size or Scale of Storage

What are ripening chambers?

Write about count and weigh method for estimating storage loss. Mention its two shortcomings also.

Discuss the effect of temperature and moisture on stored grains.

Calculate the refrigeration load due to the heat of respiration of spinach at a constant temperature of 3.33°C. Given a = 65.6 mW/kg and b = 0.131°C–1.

What are apparatus used to remove carbon dioxide from storage atmosphere.

Describe the normal and subnormal gas regimes in controlled atmosphere storage. Also mention the permissible value of gases in CAS.

What is hermetic storage technology?

Write a short note on respiration of grains during storage.

What are different types of traditional storage structure used in India. Discuss the improved version of one of them.

Write five rat control measures in storage.

Discuss the basic design components of aeration system.

Explain with diagram air movement and migration of moisture inside storage bin in summer season.