Radiation is the path out
Heat rejection depends on radiating energy into space, making surface area and temperature control mission-level constraints.
Modular liquid droplet radiators
VoidCool
Mass-manufacturable heat rejection for the next generation of sun-powered space infrastructure.
Use caseMegawatt-class orbital systems
Form factorSwappable radiator modules
Design goalHigh surface area, lower mass
The constraint layer
Heat is becoming the hard limit on what can be built in orbit.
Space platforms can gather abundant solar power, but every watt used by electronics, propulsion support, robotics, sensors, or compute becomes waste heat. In vacuum, there is no air to carry that heat away.
Mass scales too quickly
Conventional radiator area can become a launch-cost penalty as spacecraft move toward higher duty cycles and power density.
Infrastructure wants standard parts
Satellite arrays, orbital compute, and industrial spacecraft need repeatable thermal modules instead of one-off radiator geometry.
Designed for orbital scale
More sunlight means more power. More power means more heat.
VoidCool is developing radiator modules for spacecraft operators who need heat rejection to scale with infrastructure, not hold it back.
Architecture
A liquid droplet radiator, packaged as a repeatable module.
The concept uses a controlled working fluid loop that emits a thin droplet sheet into vacuum, lets the droplets radiate heat directly, then recaptures and recirculates them inside a modular spacecraft interface.
Absorb heat
Interface with spacecraft payloads, buses, or compute racks.
Emit droplets
Create a high-area sheet of controlled liquid micro-droplets.
Radiate to space
Reject thermal energy without relying on convection or fans.
Recapture fluid
Close the loop for repeated operation and modular servicing.
Where it matters
Built for the space economy's highest heat loads.
VoidCool is focused on customers whose missions become more valuable when power, compute, and duty cycle can increase without a matching radiator mass penalty.
Satellite arrays
Higher power payloads and denser constellations need lighter thermal rejection that can scale by module instead of by bespoke structure.
Orbital compute
Space-based data centers and edge inference platforms turn sunlight into compute, then immediately hit a waste-heat ceiling.
Industrial spacecraft
Mining, servicing, tug, and manufacturing vehicles need thermal systems sized for sustained work cycles rather than short bursts.
Development path
From fluid loop to flight demonstration.
NowConcept modeling and modular architecture
2026Bench-scale droplet loop prototype
2027Thermal-vacuum characterization
2028Hosted payload flight demonstration
Team
A founding company for the thermal infrastructure era.
VoidCool is led by founder Calder Russell and is assembling spacecraft thermal, precision fluidics, and scalable manufacturing talent around one core belief: space hardware needs standard thermal building blocks.
Calder Russell
Current MIT student pursuing aerospace engineering and applied mathematics, leading VoidCool's technical architecture across droplet radiator physics, spacecraft integration, and manufacturable thermal modules.
LinkedIn profileThermal Advisory
Recruiting advisors across thermal-vacuum testing, fluid stability, droplet control, and radiator qualification.
Manufacturing Partners
Engaging suppliers for precision emitters, recapture assemblies, flight materials, and repeatable module production.
Contact
Help us design the heat rejection layer for serious space power.
Reach out for investor conversations, spacecraft integration discussions, advisor roles, manufacturing partnerships, or early technical feedback.
Mission inquiriescalderr@mit.edu