Tube trains to carry giant 'ice blocks' to cool commuters

Viking wrote:

> One wonders if better ventilation for heat exhaustion would allow them
> to run the a/c in the tunnels without all this frou-frou about giant
> ice blocks and having to specially design trains - which will take a
> min of three years. Maybe a series of ports - heat does rise, after
> all.

But given the description of the air in the tunnels that might result in
unacceptable levels of pollution.

On Jun 6, 12:05 pm, Viking <n...@goodgoodbye.com> wrote:
> One wonders if better ventilation for heat exhaustion would allow them
> to run the a/c in the tunnels without all this frou-frou about giant
> ice blocks and having to specially design trains - which will take a
> min of three years. Maybe a series of ports - heat does rise, after
> all.

I suspect the heat problem is when the outside air temp is already
high. As such, the air you're pulling in isn't all that much cooler
than what you're pumping out. My first thought was that a heat
exchange medium at each station was a potential. I just can't think
real quick of a way to rapidly exchange any significant amount
of stored heat.

On Jun 6, 3:16 pm, Viking <n...@goodgoodbye.com> wrote:
> On Wed, 06 Jun 2007 11:55:58 -0700, me <oconn...@slr.orl.lmco.com>
> wrote:
>
> >On Jun 6, 12:05 pm, Viking <n...@goodgoodbye.com> wrote:
> >> One wonders if better ventilation for heat exhaustion would allow them
> >> to run the a/c in the tunnels without all this frou-frou about giant
> >> ice blocks and having to specially design trains - which will take a
> >> min of three years. Maybe a series of ports - heat does rise, after
> >> all.
>
> > I suspect the heat problem is when the outside air temp is already
> >high. As such, the air you're pulling in isn't all that much cooler
> >than what you're pumping out.
>
> Not true if the prob is train a/c overheating the tunnels.

I'm guessing that the air outside is 80F and the air inside
is 100+F. Exchanging air with the surface I would guess
would only let you get down to something around 90F.
That's still gonna feel hot.

>
> >My first thought was that a heat
> >exchange medium at each station was a potential. I just can't think
> >real quick of a way to rapidly exchange any significant amount
> >of stored heat.
>
> Vents along the lines might work.

We kicked it around here with the thermal guys. They had
similar thoughts that probably action #1 is to start at
least cooling the stations so that you aren't introducing
heat into the cars each time you open the doors. The
same cooling used at the station could be used to export
the stored heat from the car's cooling system. That way
the cars only have to store a few minutes worth of heat
before exporting it at each station and taking on new
storage capacity.

"Hatunen" <hatunen@cox.net> wrote in message
news:r9nt63dqppkv1l1ml0pln9mhgnsvv5p4tc@...
>
> In fact, that's the reason large refrigeration systems in the US
> have been rated in "tons" that being the tonnage of ice the units
> would replace.

Ha! A mystery solved at long last! Thank you!