Detecting leaks in a heat exchanger in operation
Detection apparatus
Device and method for detecting fouling in a shell and tube...
Device for inspection and/or repair of the tubes of a steam gene
Device for testing and/or repairing steam generator tubes
Devices for heating premises by the use of heat pumps and method
Diagnostic system for heat pump
Direct condensation radiator for spacecraft
Double barrier heat exchanger
Double wall tubing assembly and method of making same
Dry cooling system
Dual energy saver for air conditioning
Dual storage heating and cooling system
Dual temperature thermostatic controller
Dual tube fouling monitor and method
Duct type multizone air conditioning system
Duty cycle controller
Economizer comfort index control
Electronic circuit for controlling a heating or air-conditioning
Electronic programmable thermostat