[Digestion] Digestion Digest, Vol 5, Issue 22

Fri Nov 24 13:04:15 CST 2006

One automotive compressor might be sort of small for the loads, but I don't 
really know how many cows or goats you are milking. Do you precool milk with 
well water, what is acceptable temperature pull down time for milk, also the 
size of the cooler for the cheese?  I would try to find a large enough 
compressor rather than risk undersizing.

----- Original Message ----- 
From: <digestion-request at listserv.repp.org>
To: <digestion at listserv.repp.org>
Sent: Friday, November 24, 2006 12:00 PM
Subject: Digestion Digest, Vol 5, Issue 22

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> Today's Topics:
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>   1. Re: Yazaki coolers... (Mike Barnett)
>   2. Re: Digestion Digest, Vol 5, Issue 20 (Zietsman, Rex)
>   3. Kitchen grease to biogas (Zietsman, Rex)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 23 Nov 2006 23:17:16 -0500
> From: "Mike Barnett" <dreadlox at cwjamaica.com>
> Subject: Re: [Digestion] Yazaki coolers...
> To: "The Digestion Discussion List" <DIGESTION at LISTSERV.REPP.ORG>
> Message-ID: <00f901c70f7f$6d23e280$0100000a at Mikey>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> Thanks for correcting that typo of mine Stan!
> Correct info for interested persons, can be ascertained at
> http://www.yazakienergy.com/waterfired.htm
> I believe when something in the One tonne region comes out, then this wont
> take off!
> Right now, the Yazaki's etc. are used in a niche of larger projects,
> unfortunately... or even small family biogas systems may actually help
> generate cooling in hotter areas of the world, such as where I live, here 
> in
> Jamaica!
>
>
> Mike
> JAMAICA
>
>
>
> ----- Original Message ----- 
> From: "stan simon" <slsimon at tds.net>
> To: <digestion at listserv.repp.org>
> Sent: Thursday, November 23, 2006 5:20 PM
> Subject: Re: [Digestion] Digestion Digest, Vol 5, Issue 20
>
>
>> Yazaki water fired chillers are available in 10, 20 or 30 ton.
>>
>>
>>
>
>
>
>
> ------------------------------
>
> Message: 2
> Date: Fri, 24 Nov 2006 07:06:47 +0200
> From: "Zietsman, Rex" <Rex at Process.co.za>
> Subject: Re: [Digestion] Digestion Digest, Vol 5, Issue 20
> To: <digestion at listserv.repp.org>
> Message-ID:
> <15158807F724CB4593BF508C151108CC4B3072 at scalpel.imsgroup.local>
> Content-Type: text/plain; charset="us-ascii"
>
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> I am not sure what amount of cooling you need, are you trying to cool
> the milk tank or the whole barn?
> An automotive compressor and condensor will give you about 5 tons of
> cooling.  Trane, Carrier or York Absorption chillers start at about 100
> tons.  That smallest size would probably be the least economical.
> Yazaki advertised a hot water absorption chiller, not sure what size
> range they have.  There may be others.
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> Two parts really - the milk tank primarily to hold milk for 48 hours and
> then a "cool room" to store the cheese as it matures. 4degC or
> thereabouts?
>
> Rex
>
>
>
> ------------------------------
>
> Message: 3
> Date: Fri, 24 Nov 2006 13:05:58 +0200
> From: "Zietsman, Rex" <Rex at Process.co.za>
> Subject: [Digestion] Kitchen grease to biogas
> To: <bioenergy at listserv.repp.org>, <digestion at listserv.repp.org>
> Message-ID:
> <15158807F724CB4593BF508C151108CC4B3084 at scalpel.imsgroup.local>
> Content-Type: text/plain; charset="us-ascii"
>
> Here is an interesting article:
> "MILLBRAE, CA -- Chevron Energy Solutions, a unit of Chevron
> Corporation, and the City of Millbrae today celebrated the completion of
> new facilities at Millbrae's Water Pollution Control Plant that use a
> common urban waste -- inedible kitchen grease from restaurants -- to
> naturally produce biogas for generating renewable power and heat to
> treat the city's wastewater.
>
> The unique system, engineered and installed by Chevron Energy Solutions,
> includes a grease receiving station and an expanded cogenerator as well
> as other upgrades that result in annual revenues and energy savings of
> $366,000 for Millbrae while nearly doubling the amount of "green power"
> produced at the plant.
>
> More than 3,000 gallons of restaurant grease -- the kind washed from
> grills and pans -- will be delivered to the plant each day by grease
> hauling companies, which pay a city fee for disposals. Microorganisms in
> the plant's digester tanks eat the grease and other organic matter,
> naturally producing methane gas to fuel the plant's new 250-kilowatt
> microturbine cogenerator to produce electricity for wastewater
> treatment. Meanwhile, excess heat produced by the cogenerator warms the
> digester tanks to their optimum temperature for methane production.
>
> "This project clearly demonstrates that cities can develop renewable
> energy economically, with multiple benefits to urban communities," said
> Jim Davis, president of Chevron Energy Solutions. "By applying proven
> technologies and looking at the entire waste stream in new ways, the
> City of Millbrae has cost effectively upgraded its facilities, reduced
> its operating costs, created new revenue and solved environmental
> challenges all at the same time."
>
> "This innovative project brings new meaning to the term 'sustainable
> development,'" said Millbrae Mayor Robert Gottschalk. "Through our
> partnership with Chevron Energy Solutions, we're taking an urban waste
> and turning it into an asset for the city and the environment."
>
> Nationally, restaurants produce an average of 14 pounds of inedible
> grease per capita annually -- a total of nearly 4.2 billion pounds each
> year in the United States alone. Much of this grease is disposed of in
> landfills, where it releases methane -- a potent greenhouse gas -- as it
> decomposes, sometimes directly to the atmosphere. Millbrae's grease
> receiving station will reduce the amount of grease sent to landfills.
>
> The grease and other organic matter will produce enough biogas at the
> plant to generate about 1.7 million kilowatt hours annually, which will
> meet 80 percent of the plant's power needs and reduce its electricity
> purchases significantly. This lower demand for utility-generated power
> reduces carbon dioxide emissions by 1.2 million pounds annually, the
> same amount of carbon dioxide absorbed by planting about 170 acres of
> trees.
>
> The total cost of the project, $5.5 million, was reduced by about
> $200,000 with a rebate awarded through the state of California's
> Self-Generation Incentive Program administered by Pacific Gas and
> Electric Company. The net amount, along with maintenance costs, is being
> funded entirely by savings from the new system and, therefore, will have
> no effect on the city's wastewater treatment rates.
>
> The project's completion is being celebrated today at an event in
> Millbrae attended by national, state and local government officials and
> representatives from business, environmental organizations and academia.
>
> "This is the only wastewater treatment plant in the U.S. to receive and
> process inedible grease in a self-funding, purpose-built system that
> successfully addresses so many challenges simultaneously," said Dick
> York, superintendent of the Millbrae plant. "It's a complete solution
> that could be adopted in many cities around the country."
>
> Chevron Energy Solutions partners with institutions and businesses to
> improve facilities; increase efficiency; reduce energy consumption and
> costs; and ensure reliable, high-quality energy for critical operations.
> The company employs proven technologies to meet customers' specific
> needs, including infrastructure technologies, energy controls, solar
> photovoltaics, fuel cells, biomass and other systems.
>
> For more information about Chevron Energy Solutions, please visit
> www.chevronenergy.com "
>
>
>
> ------------------------------
>
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> End of Digestion Digest, Vol 5, Issue 22
> ****************************************
> 