Posts tagged with 'Refrigerator / freezer'

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Interesting paper on system design in Nigeria from Health Affairs. Abstract One of the major problems facing Nigeria’s vaccine supply chain is the lack of adequate vaccine storage facilities. Despite the introduction of solar-powered refrigerators and the use of new tools to monitor supply levels,...
I was recently looking at the “System Sizing tool 3/3” in a 2DI3 “Technical evaluation and Methodology” a unicef publication. The publication originated from a 2DI3 SDD industry meeting. The sizing method prescribed is based on the premise that “the daily potential solar energy supply is calculated...
Dear Supply Chain Managers and Friends, A few days ago, I conducted a supervisory visit to a health post in Senegal to check the implementation of the "Informed Push Model" project (IPM), which I have lead since last August, and which has been distributing family planning products (9 to 11 products...
WHO and UNICEF have just released a new joint publication on solar fridges and freezers that is intended to provide managers in national immunization programmes with guidance on how to implement successful solar-powered vaccine refrigerator and freezer systems. It takes into account new developments...
Dear Colleagues Is there any guidance (ideally offical and/or anecdotal) on transportation of non cold chain items in refrigerated vehicles? Assuming vehicles have space, (are making journeys less than half full), are there any concerns about transporting non cold chain, vaccine related supplies (...
Dear Colleagues, Many of the prequalified refrigerators have integrated digital thermometers with digital display outside showing instantaneous temperature readings. During the field visits, I have started to notice considerable number of refrigerators with non-functioning digital display. I a...
Potency of vaccine at the time of administration to the beneficiaries is of utmost importance in preventing morbidity and mortality due to vaccine preventable diseases. Evolution of more and more vaccines against crippling and lethal diseases has made vaccination the most cost-effective and importan...
Choices, choices, choices – they are both the bane and blessing of our times. As immunization managers, we now have a wide array of PQS-prequalified cold chain equipment to choose from, but how do we make the right choices and get the best value for our bucks? The TechNet Product Reviews area helps ...
The percent difference between the gross refrigerator (ILRs and SDDs) volumes quoted in the PQS Catalogue and the net vaccine storage volume varies from 29.6% to 88.6 %. This is a wide variation for front opening fridges, due to space for air-circulation. Increasingly, new models of ILR and SDD are...
Sun Frost developed a hybrid refrigerator/ice pack freezer, the FRH-3. The Sun Frost FRH-3 has a SDD freezer and a battery powered refrigerator. The SDD freezer is the same size as our F-1 (http://www.sunfrost.com/batteryless_direct_drive_freezer.html) and incorporates the same technology which allo...
Dear All, I am a project coordinator for Nexleaf Analytics. We are a nonprofit organization dedicated to building low-cost technologies that create positive health, environmental and social impact. I have attached a Standard Operating Procedure (SOP) for fridge maintenance for your review. Additio...
Two solar direct drive ice pack freezers have been successfully tested for seven months in Columbia. The F-1 was manufactured by Sun Frost and a second freezer was produced by Sun Danzer. The freezers were tested by Steve McCarney of SELF and the project was supported by BMGF grant. The tests result...
We think of fridge holdover time (autonomy) in the context of power shortage, whether cloudy weather in the case of solar, or power cuts for A/C systems. While this will see functioning equipment through power shortages and keep vaccine 'safe' for a given duration (a parameter which varies immensel...
The data given for solar-powered refrigerators in the PQS sheets is not given consistently enough so that comparisons of various models can be made. The data needed for a fair comparison most often is energy consumption at 32 deg C without ice making, energy use with ice making and quantity of ic...
Sun Frost has been building vaccine storage refrigerators for the past 20 years. Sun Frost is now building a direct-drive ice pack freezer. Some new technologies incorporated into the design allows the freezer to run even at very low light levels. On a cloudy day if the output of the PV array is les...
Hi, I would greatly appreciate your expert opinion on a technical question regarding extensive field monitoring of solar generator. The objective is to carry out a long-term, rather in-depth field monitoring of solar (DD) fridge installations for their long-term performance evaluation and programma...
Success has many fathers, failure is an orphan. Yet, we can learn so much more from failure than successes. The amazing safety of modern flight is a result of this systems-based analysis of failures. In contrast, medical safety continues poorly with a culture of 'blame' focusing on individuals rat...
Recently, I have seen a number of relatively large RFQ’s for direct drive refrigerators. These refrigerators do not have an ice pack freezer. From past feed back from our customers and WHO we have heard that ice packs are necessary to distribute vaccines to more remote areas. We are concerned that ...
In solar powered vaccine storage systems high quality wet cell batteries have the potential of lasting longer than sealed batteries. However, they periodically need the addition of distilled water. Distilled water can be hard to obtain in remote areas. Sun Frost has developed a method using waste h...
Compressor Replacement Without a Vacuum Pump Replacement of a compressor requires the use of a vacuum pump. Solar powered vaccine refrigerators are generally located away from the utility grid. Most vacuum pumps are powered by AC grid power making compressor replacement difficult. We have develo...
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