At Vhault Systems, we are developing a unified platform of compressor-free thermal technologies built on foundational principles that have been thoroughly validated over decades: thermoacoustic heat pumping, with roots in 19th-century physics and rigorous modern development since the 1980s, and auto-refrigeration cycles proven in industrial settings for more than 50 years. These established principles are now elevated by contemporary advancements in advanced heat exchangers, advanced materials (high-performance alloys and composites engineered for extreme thermal, pressure, and acoustic stresses), advanced manufacturing techniques such as metal sintering for creating precise, high-surface-area resonant structures and compact components, and integrated automation and AI for dynamic wave-form optimization, flow control, and predictive system management.

These enabling technologies deliver extraordinary coefficients of performance, near-zero maintenance, exceptional longevity, and true environmental compatibility—unlocking dramatic improvements in energy efficiency and system reliability as scale increases.

Advanced Ultrasonic Heat Pump (AUHP) – Compressor-Free Thermoacoustic Heat Transfer

The Advanced Ultrasonic Heat Pump (AUHP) operates on the proven thermoacoustic principle: high-intensity ultrasonic standing waves are generated within a sealed resonant chamber, creating rapid pressure and temperature oscillations that drive heat from a low-temperature source to a high-temperature sink without any moving parts.

Key components and enabling advancements include:

• Metal-sintered acoustic drivers and regenerators – Precision-fabricated via additive manufacturing to produce controlled, high-amplitude standing waves with minimal viscous and thermal losses
• Advanced heat exchangers – Optimized geometries that maximize acoustic-to-thermal energy conversion at both hot and cold ends
• Advanced materials – Specialized alloys and composites that endure intense acoustic stresses, high pressure differentials, and wide temperature ranges while minimizing acoustic dissipation
• Specialized proprietary refrigerant – A low-GWP, zero-ODP gas formulation selected for optimal acoustic properties and thermodynamic performance
• Integrated AI and automation – Real-time wave-form tuning and system monitoring to maintain peak efficiency under varying thermal loads

These elements combine to enable:

• Extraordinary COPs routinely exceeding 6–10 (with pathways to higher values through AI optimization)
• Virtually silent operation and lifespans of 30–40+ years due to the complete absence of mechanical wear
• Wide temperature lifts with minimal efficiency degradation
• Compact, scalable designs that maintain high performance density across increasing power levels
• True net-zero compatibility through elimination of mechanical failure points and harmful refrigerants

Vacuum Driven Auto Refrigeration System (VDARS) – Single-Pump Auto-Cascade Cooling

The Vacuum Driven Auto Refrigeration System (VDARS) leverages the long-validated auto-cascade principle: a single vacuum pump circulates a proprietary refrigerant mixture through a closed loop where controlled vacuum conditions induce automatic phase separation and sequential evaporation stages, achieving deep and cryogenic temperatures without compressors or external cascade staging.

Key components and enabling advancements include:

• Single vacuum pump – The only moving part, optimized for efficiency and longevity
• Proven mechanical valves – Pressure- and temperature-actuated expansion and control valves (widely used and field-tested in the HVAC/refrigeration industry) that ensure precise, reliable flow and phase separation with minimal maintenance
• Advanced heat exchangers – High-effectiveness designs that maximize phase-change heat transfer at each cascade stage
• Metal-sintered separators and evaporators – Additively manufactured structures providing exceptional surface area in compact volumes for efficient phase separation and evaporation
• Advanced materials – Cryogenic-grade alloys and composites that maintain structural integrity and thermal performance at extreme low temperatures
• Application-tailored refrigerants – Natural or ultra-low-GWP mixtures (propane for deep cooling, nitrogen for mid-cryogenic, neon/helium hybrids for ultra-low temperatures)
• Integrated AI and automation – Intelligent control of vacuum levels, valve timing, and pull-down sequences for optimal stability and efficiency

These elements combine to enable:

• Superior energy efficiency compared to traditional multi-stage systems, with rapid temperature pull-down and precise stability (±0.1 K in advanced configurations)
• Extreme reliability and low maintenance through minimal moving parts and robust, industry-standard mechanical valves
• Unmatched temperature range from -80 °C to below -180 °C and down to 1 K in progressive variants
• Compact, scalable architectures that achieve high cooling density and performance at larger capacities
• Environmentally responsible operation with natural refrigerants and no compressor-related emissions or noise

Our ongoing development focuses on refining these core principles, materials, and components to unlock ever-higher efficiency, reliability, and temperature range—establishing a new standard for sustainable thermal management.a sustainable future.