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Questions and Answers
What is the maximum condensing capacity of the freeze dryer developed by DOST HITS?
What is the maximum condensing capacity of the freeze dryer developed by DOST HITS?
Which component is responsible for evacuating air and water vapor from the freeze dryer?
Which component is responsible for evacuating air and water vapor from the freeze dryer?
What is the purpose of the Pirani Gauge in the freeze dryer system?
What is the purpose of the Pirani Gauge in the freeze dryer system?
What operating temperature can the condensing chamber of the freeze dryer achieve?
What operating temperature can the condensing chamber of the freeze dryer achieve?
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How many layers of trays does the DOST HITS developed freeze dryer have?
How many layers of trays does the DOST HITS developed freeze dryer have?
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What is the primary purpose of the relief valve in the refrigeration system?
What is the primary purpose of the relief valve in the refrigeration system?
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Which refrigerant is used in the refrigeration system described?
Which refrigerant is used in the refrigeration system described?
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What is the maximum vapor condensing capacity of the refrigeration system?
What is the maximum vapor condensing capacity of the refrigeration system?
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How does the vacuum pump interact with the drying process?
How does the vacuum pump interact with the drying process?
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What is the standard voltage requirement for the electrical controls in this system?
What is the standard voltage requirement for the electrical controls in this system?
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What is the purpose of the Type – K thermocouple in the freeze dryer?
What is the purpose of the Type – K thermocouple in the freeze dryer?
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What is the approximate downtime of the vacuum pump during operation?
What is the approximate downtime of the vacuum pump during operation?
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What is the weight of the freeze dryer system, as indicated in the specifications?
What is the weight of the freeze dryer system, as indicated in the specifications?
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What is the main function of the vacuum pump in the freeze drying process?
What is the main function of the vacuum pump in the freeze drying process?
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Which component is specifically designed to prevent leakage in the vacuum chamber?
Which component is specifically designed to prevent leakage in the vacuum chamber?
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What is the purpose of the gas ballast valve in the vacuum pump?
What is the purpose of the gas ballast valve in the vacuum pump?
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Which part of the freeze dryer is responsible for measuring vacuum pressure?
Which part of the freeze dryer is responsible for measuring vacuum pressure?
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What material is used for the product trays in the vacuum drying chamber?
What material is used for the product trays in the vacuum drying chamber?
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What is the primary role of insulation in the ice condensing chamber assembly?
What is the primary role of insulation in the ice condensing chamber assembly?
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What function does the drain valve serve in the ice condensing chamber?
What function does the drain valve serve in the ice condensing chamber?
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Which component forms a part of the condensation unit within the refrigeration system?
Which component forms a part of the condensation unit within the refrigeration system?
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Where is the sight glass located in the vacuum drying chamber?
Where is the sight glass located in the vacuum drying chamber?
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What is the function of the electric heaters in the vacuum drying chamber?
What is the function of the electric heaters in the vacuum drying chamber?
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Study Notes
Vacuum Drying Chamber
- The main drying chamber where the freeze drying process occurs.
- Includes a sight glass to view the inside, product trays made of SS304, a tray support (also SS304), electric heaters, a type-K thermocouple for measuring temperature of the trays, a seal/O-ring made of Viton, and a vacuum relief valve to increase pressure when needed.
- The sight glass is made of polycarbonate glass and is attached to the front cover of the chamber
Product Trays
- Made of SS304 and designed to hold the products that will be freeze-dried.
- Dimensions of the trays are 500mm x 300mm.
Tray Support
- Located inside the chamber, it is also made of SS304 and is responsible for supporting the trays and heaters.
Type – K Thermocouple
- Measures the heating tray temperatures.
Seal/O - ring
- Ensures airtight seal within the vacuum chamber to prevent leaks.
- Made of Viton material.
Vacuum Relief Valve
- Increases the pressure within the vacuum chamber.
Ice Condensing Chamber Assembly
- Evacuates water vapor from the chamber and converts it into ice.
- Consists of the chamber itself, front and back covers, a sight glass, seal/O-rings, insulation, and drain valves.
Ice Condensing Chamber
- Cylindrical shaped, made of SS304 stainless steel.
- Insulated with foam.
Front and Back Covers
- Dome-shaped, with flanges for attaching the sight glass.
Ice Condensing Chamber Sight Glass
- Located on the front and back cover for viewing the inside of the chamber.
Seal/O – Ring for Ice Condensing Chamber
- Prevents leaks within the ice condensing chamber.
- Made of Viton.
Insulation for Ice Condensing Chamber
- Insulated with foam wrapping around the chamber and covers for maintaining temperature.
Drain Valve for Ice Condensing Chamber
- Drains water from the chamber after use.
Pirani Gauge
- Measures the vacuum pressure inside the chamber.
- Pressure range: 0.05 – 101325 Pa.
Vacuum Pump
- Evacuates air and water vapor from the system.
- Uses VFD (Variable Frequency Drive) to convert 3-phase pump to single phase.
- Type of Pump: Oil Sealed Rotary Vacuum Pump - Pumping Speed: 10 cubic meter per hour - Oil Capacity: 1.0 – 2.5 Liters - Motor Power: 1.5 kW
Important Components of the Vacuum Pump
- Oil Mist Trap: Reduces noise and oil mist exiting the pump
- Gas Ballast Valve: Admits air to prevent liquefication of water vapor within the pump.
Refrigeration System
- Provides refrigeration to the ice condensing chamber.
- Composed of the condensing unit (compressor & condenser), receiver, and pressure gauge.
Condensing Unit
- Composed of the compressor and condenser.
- The Compressor increases the pressure of refrigerant before it enters the condenser.
- The Condenser releases heat.
Receiver
- Stores liquid refrigerant after it leaves the condenser.
Pressure Gauge
- Monitors operating pressure in the evaporator and condenser.
Pipe Connection (Ball Valve)
- Disconnects the flow of vapor in the vacuum chamber from other parts of the system.
Control Panel
- Houses the control circuit elements, switches, and light indicators.
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Description
This quiz covers the essential components of a vacuum drying chamber used in freeze drying processes. Learn about the materials, features, and functions of key parts such as the product trays, thermocouples, seals, and vacuum relief valves. Perfect for those interested in food processing and preservation techniques.
