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Experience · Engineering Internship, Hong Kong

Lingnan University

Compact Cooling System — Humanitarian Technology

Product Design · Embedded Systems · Prototyping · Team Leadership

Led a seven-person team from initial concept to a fully working cooling prototype in six weeks, integrating CAD, 3D-printed components, Peltier cooling, water circulation, airflow and Arduino/C++ control.

SolidWorksCAD3D PrintingArduinoC++Peltier CoolingEmbedded SystemsRapid PrototypingSystems IntegrationTeam Leadership
Competition Winner
First fully working prototype built from scratch in the programme
2–3°C measured cooling in 10–15 minutes
4,000 SAR team prize
01 — The Problem

Cooling for humid, high-density living

A compact cooling system for humid, high-density living environments, where conventional cooling may be expensive, bulky or hard to deploy. The engineering challenge was to combine several subsystems into one reliable, compact prototype:

CoolingAirflowWater circulationElectronicsControlCompact packaging
02 — Idea → Working System

Across the whole engineering process

I worked across the entire process — not one isolated subsystem — from concept to a tested prototype.

Problem
Concept Design
CAD
3D-Printed Prototype
Thermal + Fluid System
Electronics
Arduino Control
Testing & Iteration
Working Prototype
03 — Mechanical Design

Designed and iterated in SolidWorks

The physical system was designed and repeatedly refined in SolidWorks, with multiple physical iterations produced by 3D printing rather than stopping at CAD.

Component layoutPackagingAirflow routingCooling-system integrationPrototype iterationDesign for 3D printing
04 — Cooling System

One thermal system, several subsystems

Peltier cooling, water circulation and forced airflow had to be managed as one thermal system rather than separate components.

Electrical PowerPeltier ModuleThermal TransferWater LoopAirflowCooled Output
05 — Electronics & Control

Arduino + C++

I integrated the physical system with electronics and programmed its control in Arduino / C++, connecting the mechanical / thermal design with software-controlled hardware.

Sensor / actuator integrationEmbedded controlHardware–software integrationArduino programmingC++System debugging
06 — Systems Integration

Making everything work together

The real challenge was not making a Peltier, a pump, a fan or an Arduino work on their own — it was making all of them work together as one reliable prototype.

Mechanical StructureThermal SystemWater LoopAirflowElectronicsEmbedded Software
Integrated Cooling Prototype
07 — Rapid Prototyping

Six weeks, many iterations

With only six weeks, we worked iteratively — improving the design through multiple prototype iterations rather than trying to perfect everything before fabrication.

DesignBuildTestFind problemsModifyRebuildRetest
08 — Testing

Measured on real hardware

The final system was physically tested, not judged only from calculations or CAD.

Temperature reduction2–3°C
Within10–15 min

Observed prototype performance — not a claim of room-scale air conditioning.

09 — Team Leadership

Leading seven engineers

I led a seven-person engineering team through the six-week project, responsible for helping several technical streams converge into one working system:

Engineering leadership
  • Dividing technical work
  • Coordinating mechanical / electrical / software tasks
  • Keeping the subsystems compatible
  • Managing iteration under time pressure
  • Driving the team towards a complete integrated prototype
10 — Final Result

What we delivered

Timeframe6 weeks
Team7 people
Measured cooling2–3°C
Test time10–15 min
Competition Winner
First fully working prototype built from scratch in the programme
4,000 SAR team prize
11 — What I Did

My contribution

Contribution
  • Led the seven-person project team
  • Designed and refined the system in SolidWorks
  • Developed multiple 3D-printed prototypes
  • Integrated Peltier cooling
  • Integrated water circulation
  • Integrated airflow
  • Worked on electronics
  • Programmed control using Arduino / C++
  • Integrated hardware and software
  • Tested and iterated the complete system
  • Delivered the final working prototype
12 — Skills Developed

What the internship built up

Mechanical Design

SolidWorksCADComponent PackagingDesign IterationDesign for 3D Printing

Prototyping

3D PrintingRapid PrototypingPhysical AssemblyPrototype TestingIterative Development

Embedded Systems

ArduinoC++Hardware–Software IntegrationEmbedded ControlElectronics Integration

Thermal / Physical Systems

Peltier CoolingWater CirculationAirflow IntegrationThermal-System Integration

Engineering

Systems IntegrationTestingDebuggingDesign Trade-OffsWorking Under Time Constraints

Leadership

Technical Team LeadershipTask CoordinationMultidisciplinary IntegrationProject Delivery
Recommendation

Supervisor recommendation

Recommendation from Dr. Zhu WenkaiProgramme Manager, Office of Service-Learning · Lingnan University