Isobar is a portable refrigerator, designed to keep vaccines at the ideal temperature for places where electricity and other facilities are scarce.
Isobar is designed to keep vaccines at the ideal temperature for places where electricity and other facilities are scarce, it works on the principal of Einstein refrigeration system developed in 1906. The system uses ammonia as the refrigerant and 2-phase refrigeration brings the cooling effect. The device uses a propane burner or electric heater to separate the vapors of ammonia and water to bring the cooling effect. Isobar uses an automatic valve which helps in evaporation of Ammonia into the original chamber and gives a powerful cooling effect. Isobar maintains stable temperature control (2-8 ˚C) up to 30-days. The product is in the prototyping and development phase.
The target region includes areas such as Cambodia and parts of southeast Asia, where medical and health care facilities are scarce. The device caters to developing countries in general.
Goal 3: Good health and well-being
The device aims in providing aid to the health organizations and practitioners in remote or developing countries
This product is in the prototyping phase and not yet manufactured at scale. The development is supported by the University of Luxembourg.
The manufacturer does not intend to patent the invention so as to allow for more widespread use.
The product is in the prototyping phase, the designer can be contacted through their website.
The time in hours without (solar) energy input during which all points in the vaccine compartment remain between +2°C and +10°C without (solar) energy input and at the maximum ambient temperature of the temperature zone for which the appliance is rated.
Isobar is based on Einstein cooling technique or absorption refrigeration system which uses ammonia and water as refrigerants. The device turns ammonia into vapors which are then passed through a small orifice using an automatic control valve that brings the cooling effect. The device is designed to carry a specified load carriage for rural trips. The device is capable of delivering 8 kg of load in a 1.6 L unit that is capable of delivering dosages in rural areas. It can be sustainably recharged in an hour using a 900 W heating element for day-to-day use and a propane burner that can be recharged on-the-go in case of emergency for up to 30-days. The device meets the international standards for temperature safe vaccine distribution which if not followed leads to vaccine freezing and potency. Isobar maintains stable temperature control (2-8 ˚C) up to 30-days.
The device can be charged in an hour using a 900 W heating element for day-to-day use and a propane burner that can be recharged on-the-go in case of emergency for up to 30-days.
Designer specified performance targets include: designed for remote locations, lightweight, durable, portable, and low-cost solution to provide vaccines in rural areas.
Unknown, the device was built and tested to develop the mechanical proof of the principal unit.
No third-party organizations, only testing performed by the designer.
The design of the device permits the use of chemical-based refrigeration but the potential hazards related to the operation of this product include accidental leakage of ammonia and propane.
A reliable power source of 900 W or a propane canister as the heating source is required to charge this product.
Li, T.X., Wang, R.Z., Yan, T. and Ishugah, T.F., 2014, Integrated energy storage and energy upgrade, combined cooling and heating supply, and waste heat recovery with solid–gas thermochemical sorption heat transformer, International Journal of Heat and Mass Transfer, 76, pp. 237-246.
Aydin, D., Casey, S.P. and Riffat, S., 2015, The latest advancements on thermochemical heat storage systems, Renewable and Sustainable Energy Reviews, 41, pp. 356-367.
Mejbri, K., Ezzine, N.B., Guizani, Y. and Bellagi, A., 2006, Discussion of the feasibility of the Einstein refrigeration cycle, International Journal of Refrigeration, 29(1), pp. 60-70.
The designer is planning a pilot study on the device’s effectiveness.
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