GreenTech Solutions

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 Solar‑Driven Trigeneration System for Cooling, Hot Water & Potable Water

1. Concept Overview

The CST SOLAR‑TRIGEN™ System is a solar‑powered trigeneration solution designed to deliver cooling, useful heat, and potable water conditioning from a single integrated refrigeration platform. The system is based on the principle of maximum energy utilisation, where compressor work is not treated as waste but as a recoverable and usable resource.

Conventional cooling systems reject nearly all condenser heat directly to the atmosphere, contributing to higher ambient temperatures and increased energy demand. CST SOLAR‑TRIGEN™ fundamentally rethinks this approach by recovering and utilising a major portion of condenser heat for domestic and sanitary applications, thereby minimising atmospheric heat rejection and improving overall system efficiency.

 2. Core Philosophy

Cooling should not be achieved at the cost of heating the environment.

CST SOLAR‑TRIGEN™ treats energy as a  closed‑loop resource, delivering multiple utilities from a single energy input:

* Cooling for space conditioning

* Chilled water for drinking and process use

* Hot water for showers, kitchens, and sanitation

This integrated philosophy enables higher system efficiency, reduced operating costs, and lower environmental impact.

 3. System Architecture

The system is driven primarily by  solar power, which operates the refrigeration compressor during peak daytime availability. The refrigeration cycle is engineered with  priority heat recovery, ensuring that useful heat is captured before any residual heat is rejected to ambient air.

Key functional elements include:

Solar‑powered compressor system

Phase Change Material (PCM) thermal storage for hot water generation

Air‑cooled condenser for controlled residual heat rejection

Flake ice / ice‑based evaporator module for high‑efficiency cooling and thermal buffering

Closed‑loop chilled water circuits for space cooling and drinking water cooling

Potable water conditioning via heat exchangers, fully isolated from refrigeration circuits

 4. Energy Utilisation Strategy

Unlike conventional systems where 100% of condenser heat is rejected to atmosphere, CST SOLAR‑TRIGEN™:

Recovers a substantial portion of condenser heat into PCM storage

Supplies hot water at controlled temperatures (typically 42–60°C) 

Reduces peak heat discharge to ambient air

Delays and lowers thermal impact on the surrounding environment

The result is a significant reduction in direct atmospheric heat rejection, particularly during peak cooling hours.

 5. Applications

The CST SOLAR‑TRIGEN™ System is ideally suited for:

* Educational campuses and hostels

* Hospitals and healthcare facilities

* Worker housing and staff colonies

* Remote and off‑grid installations

* Ashrams, institutional kitchens, and dormitories

* Defence, police, and disaster‑relief facilities

These applications typically require **simultaneous cooling, hot water, and potable water**, making trigeneration a natural fit.

 6. Sustainability & Environmental Impact

Key sustainability benefits include:

* Reduced electrical grid dependency

* Productive utilisation of waste heat

* Lower urban heat island contribution

* Reduced water consumption compared to cooling‑tower‑based systems

* Alignment with ESG and climate‑resilient infrastructure goals

CST SOLAR‑TRIGEN™ represents a shift from **component efficiency** to **system efficiency**.

7. Conclusion

The CST SOLAR‑TRIGEN™ System is not a single machine, but a  systems‑level solution for modern cooling and water needs. By integrating solar power, refrigeration, heat recovery, and thermal storage into one coherent platform, it delivers higher value per unit of energy consumed while reducing environmental impact.

This approach reflects CST EnviroTech’s commitment to engineering solutions that serve both performance and the planet.

For technical discussions, pilot applications, or institutional collaboration, please contact CST EnviroTech.