[Gasification] SORPTION HEAT DRIVEN COOLERS

Tue May 27 11:01:36 CDT 2008

For the past several years, I have been collecting material from the web 
that deals with solar adsorption cooling - and while they may not be wood 
fired, the information might be of use to adapt the process to using wood 
heat.

Let me know if you would be interested in in the information.

Greg H.

----- Original Message ----- 
From: "Oscar Jimenez Cabeza" <oscar at geprop.cu>
To: "'Discussion of biomass pyrolysis and gasification'" 
<gasification at listserv.repp.org>
Sent: Tuesday, May 27, 2008 8:02
Subject: Re: [Gasification] SORPTION HEAT DRIVEN COOLERS

Dear Benjamin and gasification colleagues.

It has been rather surprising receiving a message addressing sorption heat
driven chillers in a gasification mailing list environment.
Currently we are assessing the possibility of integrating a biomass
gasification system, which its investment has been already approved for
supplying heating needs to a milk processing plant, with a sorption heat
driven chiller aimed at pre-chilling the milk produced before being
distributed to costumer. We are assessing two main scenarios:
1 Using wood gas for direct firing the absorption chiller.
2 Using steam generated in a wood gas fueled boiler and using steam for
driving the chiller.

The figure you mention in the message did not get to my end. Can you please,
re-send them to me...????
Do you have or are aware of anyone having experience of integrating/using
wood gas in sorption heat driven chillers....???

Thanking you in advance.

Kindest regards.

Oscar.

-----Mensaje original-----
De: gasification-bounces at listserv.repp.org
[mailto:gasification-bounces at listserv.repp.org] En nombre de Benjamin
Domingo Bof
Enviado el: martes, 27 de mayo de 2008 9:33
Para: Discussion of biomass pyrolysis and gasification
Asunto: [Gasification] SORPTION HEAT DRIVEN COOLERS

Sorption Heat Driven Coolers (HDCs)   The principle of sorption
refrigeration is shown in Figure 3 which illustrates the simplest type of
sorption cooler and which has an intermittent cycle consisting of two
phases. Continuous cycles are also possible - the Electrolux uses a
continuous cycle. The general term sorption covers both liquid absorption
and solid adsorption variants of this technology. Sorption units have some
very important advantages. They can be designed to contain no moving parts,
so that skilled maintenance personnel and replacements of components are
less likely to be needed. Secondly, they are simple to manufacture; local
manufacture increases local knowledge of the technology, which improves
operation, maintenance and faultfinding. Thirdly, they are readily adaptable
to locally available fuels, including biomass and solar energy. Finally, the
refrigeration circuit does not use CFCs, which damage the environment.
Sorption units are referred to as HDCs
 (heat-driven coolers).
  Conventional gas and kerosene-driven sorption units   The heat source in
conventional sorption refrigerators is usually gas or kerosene flame. Units
powered from gas bottles are used on caravans or boats. A domestic unit,
often used in remote locations in developing countries is the
kerosene-driven Electrolux. It has been calculated that the cost of
purchasing and running one of these units is around £1000 for 10 years use.
The refrigeration circuits of these devices operate reliably for many years.
Maintenance of the burner assembly is required and a constant supply of
wicks, burners and lamp glasses are essential. Lastly, the fuel tank must be
replenished with kerosene of suitable quality. These units involve the use
of hydrogen as a working fluid and cannot be designed as efficient
icemakers, although they have some ice-making capacity.
  Novel sorption units   Novel sorption units are being developed at present
for greater efficiency in ice making and cold storage. They do not involve
hydrogen as a working fluid. A great deal of emphasis is being placed on
design for reliable operation in remote environments where technical
maintenance services are not available. Emphasis is also placed, in some
cases, on design for local manufacture.
  Costs and performance figures are not easily available since many units
are still on trial. Projected retail prices for biomass driven units are in
the order of £2000 for a 100-kg per day icemaker. Taking fuel and operation
costs into account, as well as capital repayment, this represents a
production cost of ice of around £0.02 per kg.
  Solar-powered sorption units   The heat source for sorption units of the
kind shown in Figure 3 can be the sun. In a simple version the heating phase
ends at sunset, and the refrigeration phase occurs during the night. If the
sun fails to shine for a few days, the ice made on previous days acts as a
store of cold, keeping the cold box at a low temperature while it gradually
melts. It is expected that a unit producing 100 kg of ice per day can be
produced for £4,000 (including the cost of highly efficient solar thermal
panels), giving an ice cost of £0.03 per kg.
 Source; Practical Action

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