Passive defrost system using waste heat
Passive emergency ventilation system
Passive environmental temperature control system
Passive frequency stabilization in an acoustic resonator
Passive gas-gap heat switch for adiabatic demagnetization...
Passive heat pump with non-azeotropic refrigerant
Passive ice freezing-releasing heat pipe
Passive low gravity cryogenic storage vessel
Passive refrigeration fluids condition
Passive spray coolant pump
Passive thermal control enclosure for payloads
Passive three state electromagnetic motor/damper for controlling
Passive transportable cooling unit for storing vials of allergen
Passive-active thermosyphon
Passive-solar directional-radiating cooling system
Patch for radiative coolers
Patient warming or cooling blanket
Patio cooler table
Pattern classification system
Peak shaving system for air conditioning