[work-log] Mini-cascade R-507/R-1150
This is a cascade i've been building for a month or two (on and off, mostly off due to € shortage), it's main purpose will be dual-core benching, those small compressors are too weak to cool anything hotter anyway. All components are brand new except for the oil sep which i got dirt cheap on eBay.
As the project went on i was forced to buy myself my own equipment which took me some time since my budget doesn't stretch as i would like.
High temperature stage:
- compressor: Danfoss NL11F (1/3HP)
- condensor: Empor 0.72kW (200mm, three-row) + 10W 220Vac motor + 200mm fan blade
- filter/drier: Castel 20g /w service port
- refrigerant: R-507
- metering device: TC-28 (0.7mm ID) capilarity tube
Interstage heat exchanger:
- 10-plate stainless steel (rated up to 5kW water-water)
Low temperature stage:
- compressor: Danfoss NL11F (1/3HP)
- desuperheater / oil cooler: Empor 0.72kW (230mm, one-row) + 10W 220Vac motor + 230mm fan blade
- oil separator: Danfoss OUB-1 (floated)
- filter/drier: Danfoss 40g copper
- refrigerant: R-1150 - ethene / ethylene
- metering device: TC-31 (0.8mm ID) capilarity tube
- 2m stainless steel flexible suction line
- evaporator: tiborrr's Maze GT1 EE (extreme edition)
Safety:
- Ranco high pressure cut-off @ 27bar (on low temperature stage)
- 2x high pressure bourdon type pressure gauge Wigam
- Fach 0.9L receiver to act as an expansion tank 0.9L on low temp. stage
Initial preparations - lining up the component on a mock-up board:
http://shrani.si/t/3e/D5/D3Ekjer/dsc0798.jpg http://shrani.si/t/e/l7/2adYwQd/dsc0797.jpg http://shrani.si/t/1G/R5/1bc6slnc/dsc0796.jpg
Backbone of this cascade - 3mm steel plate:
http://shrani.si/t/14/41/1oWgG62f/nosilnaplosca.jpg
The evaporator / suction line / safety - HPCO:
http://shrani.si/t/3y/O1/4yxmnisE/dsc1069.jpg http://shrani.si/t/2V/ru/nUf9Ivh/dsc1068.jpg http://shrani.si/t/40/s7/39pEtTMb/dsc0794.jpg http://shrani.si/t/X/12T/1Og6iDYC/dsc0793.jpg
Manual hot gas bypass (to compressor, not into evaporator) - ball valve:
http://shrani.si/t/1n/Mj/1A34TJzW/dsc1051.jpg
Temperature monitoring - K-types & Voltcraft K102 K-type thermometer:
http://shrani.si/t/1I/V6/2aN1V8jP/dsc1049.jpg http://shrani.si/t/z/nY/2KyOLwFB/dsc1056.jpg
Interstage heat-exchanger enclosure is made out of scrap wood - three major plates are 5mm, rest is 2mm:
http://shrani.si/t/2R/H7/3uFoyBW6/dsc1059.jpg http://shrani.si/t/3o/Rh/ImtoNxL/dsc1057.jpg http://shrani.si/t/3d/11O/1nXXFzlx/dsc1060.jpg
Brazing the first stage:
http://shrani.si/t/2J/uZ/3xYtRq7j/dsc1062.jpg http://shrani.si/t/D/11w/1AkBLnad/dsc1066.jpg http://shrani.si/t/k/lB/4t6bAOEH/dsc1064.jpg http://shrani.si/t/42/27/1Z5a8HeP/dsc1071.jpg http://shrani.si/t/3K/Dg/4RdEQHr1/dsc1072.jpg
First frost on first stage @ ~ -43°C:
http://shrani.si/t/1H/cp/3VccCzCV/dsc1073.jpg http://shrani.si/t/1W/u1/vUv5f3T/dsc1076.jpg http://shrani.si/t/3Z/CM/1yIEEGxB/dsc1074.jpg http://shrani.si/t/3h/2X/1Ezpj4hc/dsc1075.jpg
Insulated with poliurethane foam (great specs, temperature conductivity ~ 0.039W/mK, neoprene has 0.036W/mK) it does ~ -53°C:
http://shrani.si/t/39/81/eO55P4Z/dsc1077.jpg http://shrani.si/t/A/NI/16T6Dir1/dsc1078.jpg
Ran out of oxygene to complete the second stage. Will continue the next weekend as i am away from home during the week.
Best regards,
Niko :up: