Huizhou Pengchengrui Technology Co., Ltd.

Nickel titanium alloy thermocooling/heating has moved from laboratory prototypes to kilowatt level practicality. The following are representative application cases and technological breakthroughs from around the world compiled by the editor of WuGe Nickel Titanium Alloy.

1、 Kilowatt level commercial air conditioning/heat pump (closest to industrialization)

（1）Hong Kong University of Science and Technology: Kilowatt level bullet cooled air conditioning (2025, Nature)

Core parameters: Total cooling power of 1284W (exceeding the kilowatt threshold), unit mass cooling power of 12.3W/g, operating frequency of 3.5Hz.

Technical architecture: 10 nickel titanium alloy units in series and fluid parallel; Each unit contains 4 thin-walled NiTi tubes; Use graphene nanofluid (2g/L) to enhance heat transfer.

Application scenarios: Home/commercial air conditioning, data center cooling.

Advantages: Zero refrigerant, quietness, and energy efficiency potential far exceeding traditional air conditioning (theoretical COP>20).

（2）Saarland University/ZeMA: Thermal Heating and Cooling Air Conditioning System (2024-2025)

Technical solution: Ultra thin nickel titanium strip/wire cyclic stretching/releasing, achieving dual modes of cooling and heating.

Performance: It can achieve room temperature regulation of 20 ℃, with no pump, no valve, and low vibration in the system.

Positioning: Green air conditioning technology supported by the European Union, ranked as one of the top ten emerging technologies of 2024 by the World Economic Forum.

Nickel titanium alloy tube

2、 Low temperature freezing/cold chain (key breakthrough to zero temperature)

（1）Hong Kong University of Science and Technology: The world's first sub zero bomb thermal refrigeration device (2026, Nature)

Core breakthrough: The temperature at the refrigeration end has dropped to -12 ℃, achieving for the first time stable thermoelastic cooling below zero degrees.

Materials and Design:

High nickel NiTi (51.2 at%), Af=-20.8 ℃, adiabatic peak temperature variation 16.3 ℃.

8 cascaded tubular units with a specific surface area of 8.68 mm ⁻¹, capable of withstanding a compressive stress of 900 MPa.

30% calcium chloride aqueous solution (antifreeze fluid) to avoid low-temperature blockage.

Applications: Medical cold chain (vaccines/biological samples), food freezing, low-temperature laboratory.

（2）Xi'an Jiaotong University: Thermal Refrigeration Refrigerator (2025)

Innovation point: Single motor drive (tilted placement), while achieving NiTi wire stretching and heat exchange switching, increasing compactness by 26%.

Parameters: Cooling temperature difference of 9.2 ℃, maximum cooling power of 3.1W; using 0.7mm nickel titanium wire, strain of 4.8% (considering lifespan).

Scenario: Home small refrigerator, car refrigeration, outdoor portable refrigeration.

3、 Laboratory Prototype and Basic Verification (Technical Foundation)

（1）University of Maryland: 200W Thermal Refrigeration Prototype (2023-2024)

Features: No pump or valve, pure mechanical drive, silent operation; The COP laboratory value can reach 20+.

Positioning: To verify the high energy efficiency and refrigerant free feasibility of bomb thermal refrigeration, and provide a technical foundation for small household appliances.

（2）NASA/Oak Ridge in the United States: Elastic Thermal Microfluidic Composite Heat Dissipation (2024-2025)

Application: Aerospace electronics, high-power chip heat dissipation.

Solution: Integration of NiTi thermal fins and microchannels, with a heat flux density of up to 500 W/cm ², achieving pump free, passive and efficient heat dissipation.

4、  Progress and Challenges in Industrialization

Progress: Kilowatt level and sub zero technologies have been validated and are expected to enter commercial trials from 2027 to 2030.

challenge

Cost: High performance NiTi raw materials and high precision machining costs.

Fatigue: The performance degradation after millions of cycles needs to be optimized.

System: Efficient driving, fluid reversing, and complex heat recovery design.

Nickel titanium bullet thermal refrigeration has formed three major application tiers of "kilowatt level air conditioning+sub zero cold chain+small household appliances", which is the ultimate zero carbon and high-efficiency solution to replace traditional steam compression refrigeration.

Wuge Nickel Titanium Alloy provides three ideological products: nickel titanium memory alloy wire, pipe, and plate. Through deep processing and manufacturing, the products are formed to solve customers' technical problems.