Peter_1
13-08-2008, 06:50 PM
This will be the final work/exams for next year classes I'm giving.
What do you guys think of it?
I appreciate your comments.
They start in September 2008 and they must give this 'project' to me in June 2009 where they will then have to defend it before a jury.
GIVEN.
A client wants a cooling/freezing chamber for the quick chilling of hot prepared foods.
The company starts at 06:00
The first chariot with 100 kg hot meals enters in the cooler at 90°C at 07:30.
Then, each hour another chariot enters the room till we have 5 chariots and a total of 500 kg food.
The goods must be cooled according HACCP.
After the quick cooling process, the room must be maintained at 2°C.
As soon night rates starts, client must have the choice to start a freezing cycle to freeze all the goods to -20°C.
At 06:00 the next morning, the room is emptied completely and cleaned before the unit is switched on again at 07:30.
So the room can function as a freezer and as a cooler.
Client wants also heat reclaim on this system to preheat water.
DEMANDS.
1 Determine Total cooling load in cooling and freezing cycle. Don’t forget the chariots, opening of the doors.
2 Re-do your calculations with Coolpack and compare results.
3 Select all components (main components and all regulating devices)with the catalogs. You clearly state how you came to the result and add a marked copy of the catalog page.
Add also pages with correction factors
4 Re- do all the calculations with the software and compare your results.
5 The compressors are located in a machineroom 6 m (18 ft) above the cooling room. Condenser and receiver are on the roof 14 m height above floor level.
6 Calculate manually suction, discharge and liquid Lines.
7 Re-do your calculations with Coolpack and Danven and compare the results.
8 Calculate line isolation.
9 Draw a equilibrium diagram in cooling and freezing phase and determine working points with an ambient of 30°C and -10°C.
10 Draw both cycles in a lop-P, each on a separate page (Coolpack and manual) Determine all the relevant pressures and temperatures.
11 With which COP will the plant run in summer and winter?
12 Draw a complete electrical layout
13 Draw the complete refrigerant circuit.
14 Determine refrigerant volume and clearly give how you came to the result.
15 Determine room, panel thickness, door , Floor and pressure valves on the room.
16 Make a complete material list and give a price for each. Give also an estimate how long you will work on this project.
17 Make a complete offer to your client like you should sell this, selling conditions included.
Following combinations are allowed
• Bock compressor + Roller evaporator + Searle condensors.
• Bitzer compressor + Goedhart evaporator+ Guntner condensors
• DWM compressor + Friga Bohn/Heatcraft evaporator+ Searle condensers
Danfoss, Alco, Honeywell
Eliwell, Dixell, Carel,..
What do you guys think of it?
I appreciate your comments.
They start in September 2008 and they must give this 'project' to me in June 2009 where they will then have to defend it before a jury.
GIVEN.
A client wants a cooling/freezing chamber for the quick chilling of hot prepared foods.
The company starts at 06:00
The first chariot with 100 kg hot meals enters in the cooler at 90°C at 07:30.
Then, each hour another chariot enters the room till we have 5 chariots and a total of 500 kg food.
The goods must be cooled according HACCP.
After the quick cooling process, the room must be maintained at 2°C.
As soon night rates starts, client must have the choice to start a freezing cycle to freeze all the goods to -20°C.
At 06:00 the next morning, the room is emptied completely and cleaned before the unit is switched on again at 07:30.
So the room can function as a freezer and as a cooler.
Client wants also heat reclaim on this system to preheat water.
DEMANDS.
1 Determine Total cooling load in cooling and freezing cycle. Don’t forget the chariots, opening of the doors.
2 Re-do your calculations with Coolpack and compare results.
3 Select all components (main components and all regulating devices)with the catalogs. You clearly state how you came to the result and add a marked copy of the catalog page.
Add also pages with correction factors
4 Re- do all the calculations with the software and compare your results.
5 The compressors are located in a machineroom 6 m (18 ft) above the cooling room. Condenser and receiver are on the roof 14 m height above floor level.
6 Calculate manually suction, discharge and liquid Lines.
7 Re-do your calculations with Coolpack and Danven and compare the results.
8 Calculate line isolation.
9 Draw a equilibrium diagram in cooling and freezing phase and determine working points with an ambient of 30°C and -10°C.
10 Draw both cycles in a lop-P, each on a separate page (Coolpack and manual) Determine all the relevant pressures and temperatures.
11 With which COP will the plant run in summer and winter?
12 Draw a complete electrical layout
13 Draw the complete refrigerant circuit.
14 Determine refrigerant volume and clearly give how you came to the result.
15 Determine room, panel thickness, door , Floor and pressure valves on the room.
16 Make a complete material list and give a price for each. Give also an estimate how long you will work on this project.
17 Make a complete offer to your client like you should sell this, selling conditions included.
Following combinations are allowed
• Bock compressor + Roller evaporator + Searle condensors.
• Bitzer compressor + Goedhart evaporator+ Guntner condensors
• DWM compressor + Friga Bohn/Heatcraft evaporator+ Searle condensers
Danfoss, Alco, Honeywell
Eliwell, Dixell, Carel,..