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Related Experiment Video

Updated: Dec 7, 2025

Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation

Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation

Published on: February 5, 2020

Nano Heat Pump Based on Reverse Thermo-osmosis Effect.

Ji Li¹, Rui Long¹, Bo Zhang¹

¹School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.

The Journal of Physical Chemistry Letters

|September 29, 2020

Summary

This study introduces a novel heat pump utilizing reverse thermo-osmosis (RTO) in nanoporous graphene membranes. The RTO heat pump demonstrates efficient heat and mass transport, with potential for high performance in various applications.

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Area of Science:

Materials Science
Thermodynamics
Nanotechnology

Background:

Heat pumps are crucial for domestic, agricultural, and industrial thermal management.
Existing heat pump technologies face limitations in efficiency and application scope.
Novel mechanisms for efficient heat and mass transfer are actively sought.

Purpose of the Study:

To introduce and validate a new heat pump design based on the reverse thermo-osmosis (RTO) effect.
To investigate the heat and mass transport capabilities of a nanoporous graphene (NPG) membrane in an RTO system.
To evaluate the performance metrics, including heat flux and coefficient of performance (COP), of the proposed RTO heat pump.

Main Methods:

Utilizing classical molecular dynamics (MD) simulations to model the RTO process.
Investigating the influence of hydraulic pressure on heat and mass fluxes.
Analyzing the behavior of water molecules during evaporation on the NPG membrane.

Main Results:

Demonstrated efficient mass and heat transport via the RTO effect in an NPG membrane.
Observed a linear increase in heat and mass fluxes with applied hydraulic pressure.
Achieved ultrahigh heat fluxes (6.2 ± 1.0 kW/cm²) and a COP of 20.2 at specific operating conditions (5 K temperature increment, 80 MPa pressure).
Identified cluster evaporation of water molecules, reducing vaporization enthalpy.

Conclusions:

The novel RTO heat pump using NPG membranes shows significant potential for efficient thermal management.
The performance of the RTO heat pump is tunable via hydraulic pressure.
Cluster evaporation phenomenon offers a unique pathway to enhance heat pump efficiency.