Updated on January 4, 2024


Created on June 18, 2016

Promethean Rapid Milk Chiller

Upcoming Update

Promethean Rapid Milk Chiller (RMC) is a modular milk chilling system that instantly cools milk from 35oC to 4oC.

Developed By
  1. Promethean
Tested By
  • Promethean Power Systems
Content Partners


Product Description

Promethean Rapid Milk Chiller (RMC) is a modular milk chilling system that instantly cools milk from 35 to 4 degrees C utilizing Promethean’s Thermal Storage System (TSS). The system can chill 1000 liters of milk per day even if there is no power during the milk collection process by using 4-5 hours of intermittent grid power between each milking shift. Promethean power systems has served 25,100 farmers and chilled 150,600,000 L of milk with their products.

Target SDGs

SDG 2: Zero Hunger

SDG 1: No Poverty

Market Suggested Retail Price


Target Users (Target Impact Group)

Community, Small and Medium-sized Enterprises

Distributors / Implementing Organizations

Promethean Power Systems in partnership with USAID and MIT

Competitive Landscape

Manufacturing/Building Method

Manufacturing and assembly take place a factory space in Pune (India) where Promethean produces 50-60 units/month

Intellectural Property Type


User Provision Model

Users can obtain the Rapid Milk Chiller directly from Promethean Power Systems contact page. Potential users may also request a demonstration of the product.

Distributions to Date Status

Promethean Power Systems has installed about 1200 milk chilling units as of 2020.

Storage capacity (L)

1000L Storage Tank (Optional)

Time to cool (hr)

210 L/hr

Cooling retention (hr)


Temperature control


Minimum internal temperature (°C)


Materials of construction

Stainless steel with 50mm polyurethane foam for insulation. Interview with representative

Protection from insect entry

Yes. Interview with representative

Refrigeration cycle catalyst


Design Specifications


Product Schematics

Technical Support

Provided by Promethean Power Systems. Interview with representative

Replacement Components



The Rapid Milk Chiller comes with a 1-year warranty. The thermal battery does not need to be replaced every 3 years like electrical batteries. Interview with representative

Manufacturer Specified Performance Parameters

Performance targets

Instant Milk Cooling

  • Crash cooling arrests bacteria growth instantly.
  • Premium quality enables longer shelf life of processed milk and higher margins on value-added products.
  • Capture more farmers in the catchment area.
  • Thin film on the surface cooler deaerates the milk.
Cold Storage Backup
  • Eliminates diesel generator.
  • Low maintenance & operating costs.
  • Unlike electrical batteries, thermal battery does not need to be replaced every 3 years.
Simple Design
  • Works with single phase connection at village collection centers.
  • Easy manual cleaning.

Vetted Performance Status

According to the manufacturer BRAC has been able to reduce the milk spoilage by over 90% and it has also increased the confidence of the farmers in the village leading to a increase of 60% in the volume of milk collected


The milk chiller should not be placed under the sun. Minor burn hazard due to the very low temperatures.

Complementary Technical Systems

A milk storage tank that comes as an optional component

Academic Research and References

Hegde, V., Bhattachrya, A., Srikari, S., 2014. Design of mobile raw milk chilling unit for rural areas. SAS Tech Journal, 13(1), pp. 31-38.

Sidney, S., Thomas, J., Dhasan, M.L., 2020. A standalone PV operated DC milk chiller for Indian climate zones. Sadhana, 45(1).

Kaushik, P., Kumari, S., Bharti, S.K., Dayal, S., 2014. Isolation and prevalence of Salmonella from chicken meat and cattle milk collected from local markets of Patna, India. Veterinary World, 7(2), p. 62.

Compliance with regulations

MBRT (Methylene Blue Dye Reduction Test) level of milk collected by Heritage Foods has increased to 4.5 hours, according to the Bureau of Indian Standards’ (BIS) 1479, 4 or higher is considered good.

Other Information

Promethean Power Systems YouTube channel Promethean Power Systems has won a couple of awards and recognitions Promethean Power Systems Partners Rapid Milk Chiller - RMC Operations YouTube Video Manufacturing Contact Design specifications warranty MBRT Promethean’s Rapid Milk Chillers Pave the Way for Dairy Processors in India Bureau of Indian Standards’ (BIS) 1479  

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