초록 ▼

A heat exchanger for use with a portable oven. The disclosed heat exchanger maximizes the conversion of heat caloric content of a combustible fuel to useable heat energy. A gas fueled infra-red burner mounted above the heat exchanger directs radiant energy toward a metal plate which also is contacte

A heat exchanger for use with a portable oven. The disclosed heat exchanger maximizes the conversion of heat caloric content of a combustible fuel to useable heat energy. A gas fueled infra-red burner mounted above the heat exchanger directs radiant energy toward a metal plate which also is contacted by waste or effluent from the burner. The metal plate in turn transmits heat by conduction to a sealed passageway or flow path through which air circulates on its way to the oven. By heating the plate with both effluent and radiation approximately 70% of the heat caloric content of the gas fuel is converted to heat energy for heating air in the passageway. Use of a sealed passageway allows conditions inside the oven to be controlled to make the oven suitable for use as a test oven.

대표청구항 ▼

A portable oven heating unit comprising: means defining first and second chambers sealed from each other and having a common boundary for conduction of heat between said chambers; a gas fired burner positioned to radiate energy into the first of said chambers, said burner producing a heated effluent

A portable oven heating unit comprising: means defining first and second chambers sealed from each other and having a common boundary for conduction of heat between said chambers; a gas fired burner positioned to radiate energy into the first of said chambers, said burner producing a heated effluent which flows through said first chamber to an exhaust; heat transfer elements coupled to said common boundary in said first chamber such that radiant heat from said burner as well as convection heat from said effluent heats both said elements and said boundary; a first fan for moving gas to be combusted and air to said burner and moving effluent and air through said first chamber to promote heat transfer from said effluent and air in said first chamber to said heat transfer elements and said boundary; and a second fan to promote heat transfer away from said boundary through said second chamber by moving air into contact with said boundary.