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RuKart: World's Pioneering passive Cooling tech Company

Our Expertise - The world's first compressor-free Scalable refrigerator

RuKart's Subjee Cooler & ZEN are green, recurring, cost-free technologies with dual benefits: natural ripening & Storage. It is based on the patented “Enhanced Evaporative Cooling” principle developed by RuKart. Its innovative membrane-based cooling system requires no utility/power & only 3- 14 litres of Water/Day.

Our Technology & its Scope

 A full-size household refrigerator that maintains 17.7–22°C at no load & 10-21°C less than ambient without a compressor, refrigerant, or any extra heat pumping into the environment — and with absolutely no power input. Powered entirely by passive thermodynamic principles — radiative cooling, innovative membrane systems, and natural convection - & works across all climatic zones, everywhere. 


Next-generation cooling technology powered by patented passive systems with dual benefits of Storage + Natural Ripening. Cooling your perishable produce or naturally ripening your fruits without heating the planet.

Our Sustainability

 

  • Zero power consumption — no electricity/Solar needed, ever
  • Fully off-grid — works anywhere, no solar panel required
  • Zero refrigerant — no HFCs, no leaks, no ozone risk
  • Silent operation — no compressor, no moving parts
  • Low water input — 80% of input water is re-usable the next day
  • Multiple benefits —  Naturally ripen your fruits without any application of Calcium Carbide or Ethylene.
  • Not just Storage — No Nutrient loss due to cold stress or thermal shocks

How does it work

Refrigerator was designed for meat, dairy & processed food. Not for fresh produce like perishables.

 Yet across South Asia, Africa, and Southeast Asia — millions of vendors, grocery owners, and small farmers are paying a premium every month for a machine that is quietly destroying their margins.

This is not a small problem.

Post-harvest losses in the Global South run at 30–40% of all fresh produce. A significant chunk of that loss happens not in transit, not in the field — but in the wrong kind of cold storage. 

So what does fresh produce actually need?

 Not freezing. Not dry cold.

It needs cool, humid air — the kind that mimics the natural environment where the produce grew. That's exactly what RuKart's patented "Enhanced" evaporative cooling delivers.

No Power. No refrigerant gas. No maintenance cost.
No ₹10,000 monthly electricity bill + monthly maintenance cost.

Just nature. Just results. 🌿 

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WHY RUKART

Dual Benefits: Natural Ripening + storage

Dual Benefits: Natural Ripening + storage

RuKart models act as a natural ripening chamber along with storage technology. Thus, serving the complete needs of your family or retail store.

No Power/ recurring cost/ utility

Dual Benefits: Natural Ripening + storage

RuKart models do not need any external power or utility. It needs only 3-14 litres of clean, potable water/day during storage & no water during the ripening process.

Freshness, Nutrition & Taste

Subjee Cooler (Pink) preserves natural aroma, colour, freshness, nutrition, stiffness/tenacity & taste as good as freshly harvested compared to traditional storage technologies (Blue).

No Thermal Shock

The stored produce does not experience thermal stress like in a cold storage/Refrigerator. Thus, no need to maintain an end-to-end cold chain. Enjoy the farm-level freshness at home.

Climate Agnostic technology

RuKart's Subjee Coolers & ZEN have been installed in Cherrapunji & Mawsynram (the 1st & 2nd wettest places on the Planet), in the Snow-Capped Himalaya & in coastal regions.

Green Technology

RuKart saves 8.3X & 137X CO2e compared to equivalent capacity Solar & Electricity powered storage technology, respectively.

Multi-Purpose use

RuKart - Subjee Cooler or ZEN -  provides you an opportunity to store multiple commodities like Flowers, Fruits, Mushroom & Vegetables together while maintaining their respective freshness.

Cooling needs 1,050 L water/Year

With advanced membrane technology, 80% of the applied water can be re-used after 1 month of regular operation. Thus, bringing the total water required/year to 220 litres for 165L Model & 1,050 litres for 100 kg model.

Optimal Temperature range

Optimal Temperature range

17.7-22°C is the optimal temperature maintained in the Subjee Cooler at No or Low load. This provides an ideal environment for maintaining "the Life Force" in perishables. 

Video

Enjoy the natural freshness with Freshly - Delhi NCR

 Freshly believes fruits & vegetables are not just food—they carry Aroma, Nutrition & Taste, the #Prana, i.e., life force that nourishes us.

Unlike Vapor Compression powered conventional refrigeration that relies on electricity or solar & strips away natural vitality, RuKart's solution is designed to:

✨ Maintain natural Aroma & Freshness
✨ Preserve nutrients & vitality
✨ Work in harmony with the Nature - no Power needed.

Sahaja Samruddha Organic FPC has been using Subjee Cooler since April 2022

Listen to Somesh Ji, the CEO, Sahaja FPC. Sahaja FPC is one of the largest FPCs from India.

when Farmers' biological clock & harvesting clock were opposite.

There is a supply chain problem that no spreadsheet captures -& it's costing farmers their health.

How RuKart is different from conventional vapor compression cycle based Cold Storage

 Vapour compression cooling devices in our homes emit heat, contributing to global warming and climate change, creating a vicious cycle we must break. RuKart's mission is to provide eco-friendly refrigeration solutions that enhance your quality of life while promoting heat wave mitigation through innovative green cooling methods. We are committed to sustainable cooling technology and Nature based green cooling, ensuring a better tomorrow for our planet with our refrigerant-free cooling systems. 

Enjoy Freshness, Nutrition & Taste with RuKart

Fridge/Refrigerator was designed for meat, dairy & processed food. Not for fresh produce.

PDF Viewer

3rd Party independent impact study report.

AEEE conducted a study for about 1 year & documented the efficacy of Subjee Coolers at Sahaja Samruddha Organic FPC in Bengaluru.

Download PDF

PDF Viewer

ITC independent study about the efficacy of Subjee Cooler

ITC Guntur research team conducted experiments at a retailer's outlet in Chutugunta Rythu Bazaar, Guntur, Andhra Pradesh.

Download PDF

BRANDS USING SUBJEE COOLER TO SUPPLY FRESH PRODUCE

Organic Mandya
blinkit, Zepto
Instamart, Swiggy

TESTIMONIALS


    At RuKart, we believe fruits & vegetables are not just food—they carry "Prana" i.e life force that nourishes us.


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