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" <[email protected]> wrote: > Oscar, > > > > Thanks. This is a good start. > > > > Tom > > > > From: Gasification [mailto:[email protected]] 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:[email protected]] 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. <[email protected]> _______________________________________________ Gasification mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org for more Gasifiers, News and Information see our web site: http://gasifiers.bioenergylists.org/
