[Gasification] Gasification or Pyrolysis + Absorption Chiller for Fruit

Oscar Jimenez Cabeza oscar at cubaenergia.cu
Fri Aug 15 11:10:18 CDT 2014


Rolf.

Thank you very much for your message.
Regarding a different cooling agent, you are looking for, I do not have
information, at least for commercially proven chillers. Perhaps some
research could be in its development stage at universities o research
centers. 
On the other hand, even chillers driven by producer gas, on commercial
bases, is a rather uncommon technology.  

Thanking you once again.

Kindest regards.

Oscar.


  


-----Mensaje original-----
De: Gasification [mailto:gasification-bounces at lists.bioenergylists.org] En
nombre de Energies Naturals C.B.
Enviado el: viernes, 15 de agosto de 2014 10:26
Para: gasification at lists.bioenergylists.org
Asunto: Re: [Gasification] Gasification or Pyrolysis + Absorption Chiller
for Fruit

Oscar,

here in Spain they use quite a lot of l-b chillers in "trigeneration" mode (
heat-electricity-cold) in cogeneration with ICE's and solar. The driver temp
is tipically around or just above 100 °C.Backcooling via a cooling tower
gives you a higher COP but you loose heating value.

For fruit or vegetable conserves, heat in the higher range could be
interesting for sterilizing before chilling or bottling.

This asks for ammonium machines.

Do you know whether there is a different cooling agent for e.g. 350/ 120 °C
situations burning TLUD gas ?

Rolf 




On Fri, 15 Aug 2014 10:02:47 -0400
"Oscar Jimenez Cabeza" <oscar at cubaenergia.cu> wrote:

> Dear Rolf,
> 
> Thanks for your note about COP´s value in absorption chillers. 
> I am not really a cooling specialist. I am a chemical engineer who has
been
> always interested on thermodynamic, energy efficiency etc. 
> When talking about absorption chillers there are two main technologies:
> 
> 1. Lithium bromide chillers.
> 2. Ammonia chillers.
> 
> Usually the first one, as far as I know, are mainly used in air
conditioning
> systems. I remember reading articles, some years ago, about their
> application in cooling class rooms in a college in United States.
> The second one are mainly used for industrial cooling, in order to keep
> vegetables and fruits at a proper temperature.
> Actually when I made my estimates for Tom, I was mainly thinking on
ammonia
> chillers, based on what I mentioned above regarding what published
> literature and thermodynamic texts states on this issue. 
> Current state-of-the-art on this matter is something I am not wholly
> updated, however anyone really interested may get a deeper insight should
> there be enough time to spend on it.
> Maybe re-estimating the figures, using a little bit less COP´s value,
would
> led to using more biomass to gasify in order to increase producer gas flow
> to the chiller. The question is: Is there room for increasing producer gas
> demand having the same level of cooling...????
> 
> Thanking you one more time.
> 
> Kindest regards.
> 
> Oscar.
> 
> 
> 
> 
> 
> 
> -----Mensaje original-----
> De: Gasification [mailto:gasification-bounces at lists.bioenergylists.org] En
> nombre de Energies Naturals C.B.
> Enviado el: jueves, 14 de agosto de 2014 15:25
> Para: gasification at lists.bioenergylists.org
> Asunto: Re: [Gasification] Gasification or Pyrolysis + Absorption Chiller
> for Fruit
> 
> 
> Hallo Oscar,
> 
> the estimated COP of .6 is reported as normal for lithium bromide
chillers,
> but experiments in Spain some years ago led to minor COP s :
> 
> http://www.sciencedirect.com/science/article/pii/S1359431107002098
> 
> Abstract
> 
> Trials were conducted to determine the performance of a commercial
> (Rotartica 045v) 4.5-kW air-cooled, single effect LiBr/H2O absorption
> chiller for residential use. The experiments were run at La Poveda,
Arganda
> del Rey, Madrid, in August 2005. Three typical August days, with different
> outdoor temperatures, were chosen for the study. The hot water inlet
> temperature in the generator varied throughout the day from 80 to 107 °C.
> Thermal demand was calculated, along with period energy balance and COP.
> Variations in machine component temperatures were recorded and chilling
> power and the daily COP calculated for each of the three days. The results
> for the period as a whole showed that cooling power tended to decline with
> rising outdoor dry bulb temperatures. At temperatures from 35 to 41.3 °C
the
> chilled water outlet temperature in the evaporator climbed to over 15 °C.
> The average COP for the period, when auxiliary equipment was included into
> the calculations, was 0.37.
> 
> But this refers to  a typical 100/40 °C situation. (Is that your
> condensation figure in the tropics?)
> 
> I am by no means an absorbtion specialist, but I guess that with a
different
> configuration and the higher input temperatures
> available from the gas flame (ammonium/water?) you can even chill down to
> freezing temps at a reasonable COP.
> 
> I would be delighted to hear from our cooling specialists and learn what
is
> the state of the art.
> 
> Rolf
> 
> 
> On Thu, 14 Aug 2014 10:26:30 -0700
> "Tom Miles" <tmiles at trmiles.com> wrote:
> 
> > Oscar,
> > 
> >  
> > 
> > Thanks. This is a good start. 
> > 
> >  
> > 
> > Tom 
> > 
> >  
> > 
> > From: Gasification
[mailto:gasification-bounces at lists.bioenergylists.org]
> On
> > Behalf Of Oscar Jimenez Cabeza
> > Sent: Thursday, August 14, 2014 11:14 AM
> > To: 'Discussion of biomass pyrolysis and gasification'
> > Subject: Re: [Gasification] Gasification or Pyrolysis + Absorption
Chiller
> > for Fruit
> > 
> >  
> > 
> > Dear Tom,
> > 
> >  
> > 
> > I have always been interested in generating cold by using producer gas.
I
> > think it has been an issue which has unfortunately deserved little
> > attention, when compared to power and heat production.
> > 
> > In order to answer your question,  I am sending my preliminary estimates
> on
> > the practical refrigeration capacity you are asking for.
> > 
> >  
> > 
> > 1.      Assuming 2.5 tpd of biomass to be gasified, it should deliver
> > roughly 240 m3/h of producer gas.
> > 
> > 2.      Considering a COP value of 0.6 for the chiller.
> > 
> > 3.      LHV of the gas of 5000  kJ/m3.
> > 
> >  
> > 
> > My modest estimates of the refrigeration  capacity should be around 200
> kW.
> > 
> >  
> > 
> > I hope those figures could be of help to you.
> > 
> >  
> > 
> > Kindest regards.
> > 
> >  
> > 
> > Oscar.
> > 
> >  
> > 
> >  
> > 
> >  
> > 
> > De: Gasification [mailto:gasification-bounces at lists.bioenergylists.org]
En
> > nombre de Tom Miles
> > Enviado el: jueves, 14 de agosto de 2014 12:08
> > Para: 'Discussion of biomass pyrolysis and gasification'
> > Asunto: [Gasification] Gasification or Pyrolysis + Absorption Chiller
for
> > Fruit
> > 
> >  
> > 
> > In the tropics there are needs for making char and cooling fruit. Has
> anyone
> > coupled a small pyrolyzer or gasifier up with a boiler and an absorption
> > chiller? What sizes and capacities make sense? We're looking at a fuel
> input
> > of 2-3 tpd. How much char can I make and what practical refrigeration
> > capacity can I generate? I am assuming that the chiller can get down to
> > about 36 F (2 C). The cooler the better. 
> > 
> >  
> > 
> > Thanks
> > 
> >  
> > 
> > Tom
> > 
> > 
> >   <http://correo.cubaenergia.cu/firma_correo.png> 
> > 
> 
> 
> -- 
> Energies Naturals C.B. <energiesnaturals at gmx.de>
> 
> _______________________________________________
> Gasification mailing list
> 
> to Send a Message to the list, use the email address
> Gasification at bioenergylists.org
> 
> to UNSUBSCRIBE or Change your List Settings use the web page
>
http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenerg
> ylists.org
> 
> for more Gasifiers,  News and Information see our web site:
> http://gasifiers.bioenergylists.org/
> 
> 
> 
> 
> 
> _______________________________________________
> Gasification mailing list
> 
> to Send a Message to the list, use the email address
> Gasification at bioenergylists.org
> 
> to UNSUBSCRIBE or Change your List Settings use the web page
>
http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenerg
ylists.org
> 
> for more Gasifiers,  News and Information see our web site:
> http://gasifiers.bioenergylists.org/


-- 
Energies Naturals C.B. <energiesnaturals at gmx.de>

_______________________________________________
Gasification mailing list

to Send a Message to the list, use the email address
Gasification at bioenergylists.org

to UNSUBSCRIBE or Change your List Settings use the web page
http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenerg
ylists.org

for more Gasifiers,  News and Information see our web site:
http://gasifiers.bioenergylists.org/








More information about the Gasification mailing list