Hot air heater
AssigneeE. I. Du Pont de Nemours and Company
InventorMartval John Hartig
Life of this patent
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Abstract
A high efficiency hot air heater is disclosed in which the combustion products of a flame are forced through water in a contacting device. The combustion products and whatever moisture is evaporated are passed through a heat exchanger to heat air such as for a home. The moisture which condenses in the heat exchanger is returned to the water contactor and the combustion products are vented to the atmosphere. Due to the low temperature of the combustion products and evaporated water, a plastic heat exchanger can be used, which is low enough in cost to permit using a large unit for maximum heat utilization.
Claims7
A heater comprising a burner, means to conduct combustion products into contact with a liquid comprising water, said means being sized to provide combustion products at a temperature of from about 175.degree. F to about 190.degree. F, a blower adapted to transport from said burner through said liquid and urge said combustion products through a heat exchanger, which is made from a thermoplastic resin, which has from 3 to 10 square feet of air surface per 1,000 Btu per hour burner capacity, which heat exchanger is adapted to exchange the heat from said combustion products with forced air.
A heater comprising a burner, a chimney adjacent said burner which chimney protrudes through a body of water into a bubble cap, means to maintain said water at a predetermined level such that the combustion products from said burner are at a temperature of from about 175.degree. F to about 190.degree. F, a blower adapted to transport combustion products from said burner through said water and urge said combustion products through a heat exchanger, which is made from a thermoplastic resin, which has from 3 to 10 square feet of air surface per 1,000 Btu per hour of burner capacity is adapted to exchange heat from said combustion products with forced air.
A process of heating air comprising burning a fuel to produce combustion products, passing the combustion products into contact with a liquid comprising water to produce a gas mixture of moisture and combustion products having a temperature of from about 175.degree. F to about 190.degree. F and passing said gas mixture through a heat exchanger made of a thermoplastic resin to heat air.
Dependencies are inferred from the claim text.