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@cybergibbons | |||||
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For those of you interested in what the engine room of a container ship looks like, I posted some pictures last year:
twitter.com/cybergibbons/s…
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Cybergibbons! (Project Zero Hounslow)
@cybergibbons
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4. sij |
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We used to factor around 4kW for a reefer... so that would be around 4MW total. Easy!
Problem is, bananas are not average.
Most frozen cargo is taken onboard frozen. It doesn't take much power to keep it frozen at -21degC
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Cybergibbons! (Project Zero Hounslow)
@cybergibbons
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4. sij |
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Bananas are different though - they are often packed warm, and brought directly to the ship.
They are also kept at +14degC.
This means the refrigeration needs to work harder.
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Cybergibbons! (Project Zero Hounslow)
@cybergibbons
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4. sij |
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We are now looking at as much as 20kW to cool that container when it comes onboard, and 8kW to maintain the temperature.
We've jumped to 8MW at least!
That's changed what you are doing in the engine room.
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Cybergibbons! (Project Zero Hounslow)
@cybergibbons
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4. sij |
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Each of the 5 generators on the Emma Maersk is around 4MW.
You are now running 3 generators just to keep the ship running in port!
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Cybergibbons! (Project Zero Hounslow)
@cybergibbons
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4. sij |
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Worse still, the shaft generator (the thing that recovers power from the main engine) is only 8.5MW.
You are now having to run extra generators. Not economical. But doable.
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Cybergibbons! (Project Zero Hounslow)
@cybergibbons
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4. sij |
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So where does all that heat go from the refrigerated containers?
The air.
That's fine above the hatches. But what about below the hatches?
Well, you need fans. And a lot of them.
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Cybergibbons! (Project Zero Hounslow)
@cybergibbons
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4. sij |
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No container ship I worked on had enough below hatch ventilation to handle 100% bananas. 100 containers dumping 8kW of power under a hatch is a lot.
Total guess, but I don't think you'd manage more than 75% of reefer being at full load.
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Cybergibbons! (Project Zero Hounslow)
@cybergibbons
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4. sij |
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So I think at best... we have 750 * 120k = 90 Mega Bananas.
Enough for everyone in the UK and me.
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Cybergibbons! (Project Zero Hounslow)
@cybergibbons
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4. sij |
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How do shipping companies handle this? Well, there are actually special banana ships - they are open hatch and can easily handle the load.
Anyway, hope that was fun :)
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Cybergibbons! (Project Zero Hounslow)
@cybergibbons
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4. sij |
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This is what happens when you just multiply containers by how much you think is in them.
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Per Tolbøll
@PerTolboll
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7. sij |
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The correct overall capacity for Emma is around 18000 TEU (the "official" number was around 15.000)
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Cybergibbons! (Project Zero Hounslow)
@cybergibbons
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7. sij |
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I think you are confusing the E class with the Triple-E.
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🚩Auntie Shepherd🏴
@NeolithicSheep
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6. sij |
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Being ex-Navy I'm way more interested in what the berthing was like!
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Cybergibbons! (Project Zero Hounslow)
@cybergibbons
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6. sij |
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En-suite, own cabin. Generally very nice in PONL. Some are stupidly spacious.
Some of the newer ones I have been on are Spartan.
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Steve Cheeseman
@steve149c
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5. sij |
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Very interesting, you must be an Engineer!
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Cybergibbons! (Project Zero Hounslow)
@cybergibbons
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5. sij |
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Used to be :)
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Michael Knudsen
@lookitsmk
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5. sij |
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My dad told a story of how once during maintenance they dropped the piston and someone lost most of his non-thumb fingers because he was holding on to the air-intakes or something.
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Cybergibbons! (Project Zero Hounslow)
@cybergibbons
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5. sij |
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Maybe he was in the scavenge space and had his hand through the exhaust ports on the liner?
marineengineeringonline.com/scavenge-port-… pic.twitter.com/lDQYa6BOFj
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Scott Schnaars (rhymes with 🚙 🚕, 🎸🎸, 📶, & ✨)
@schnaars
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5. sij |
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That photo needs a banana for scale.
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Codhisattva
@jfricker
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6. sij |
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All I see is a massive climate death machine.
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Quinn Norton should be writing right now
@quinnnorton
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6. sij |
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i see your food supply. it's complicated.
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