Method and device for improving thermal efficiency of gas water heater
A gas-fired water heater, a technology of thermal efficiency, applied in fluid heaters, lighting and heating equipment, refrigerators, etc., to achieve high performance coefficient, simple structure, and reduce air pollution.
Active Publication Date: 2013-02-20
江苏中国科学院能源动力研究中心 +1
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Problems solved by technology
The injection-absorption compound heat pump system is still rare, and the injection-absorption compound heat pump or refrigeration system using ammonia water as the working fluid has not been reported.
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[0034] The method for improving the thermal efficiency of a gas-fired water heater provided by the present invention adopts ammonia water with a moderate concentration as the working medium (the mass concentration of ammonia is 35% to 65%), and the main process is as follows:
[0035] The flue gas produced by the combustion of natural gas and combustion-supporting air completes heat exchange in three stages of high temperature, medium temperature and low temperature in the flue, and transfers the heat to the working medium with different concentrations. Among them, the flue gas in the medium-temperature section exchanges heat with a medium-concentration ammonia solution for the purpose of gas-liquid phase separation. Since ammonia is more volatile than water, the liquid phase is a dilute ammonia solution containing a small amount of ammonia, and the gas phase is a medium-temperature solution containing a small amount of steam. High-pressure ammonia gas, the former will be used ...
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The invention discloses a device for improving the thermal efficiency of a gas water heater. The device mainly comprises a combustion chamber, wherein a high-temperature heat exchanger, a medium-temperature heat exchanger and a low-temperature heat exchanger are sequentially installed from an air inlet of a flue of the combustion chamber to a smoke outlet of the flue of the combustion chamber, a liquid inlet of the medium-temperature heat exchanger is connected with a first solution pump, a liquid outlet of the medium-temperature heat exchanger is connected with a gas-liquid separator, a gas phase outlet of the gas-liquid separator is connected with a first condenser, a liquid phase outlet of the gas-liquid separator is connected with a liquid inlet of the high-temperature heat exchanger through a second solution pump, a liquid outlet of the high-temperature heat exchanger is connected with an inlet of an ejector, the first condenser is connected with a liquid inlet of the low-temperature heat exchanger, a liquid outlet of the low-temperature heat exchanger is connected with an injection port of the ejector, an outlet of the ejector is connected with a second condenser, and the second condenser is connected with a liquid inlet of the medium-temperature heat exchanger through the first solution pump. The invention also discloses a method for improving the thermal efficiency of the gas water heater.
Description
technical field [0001] The invention relates to a method for improving the thermal efficiency of a gas water heater. [0002] The present invention also relates to a device for realizing the above method, that is, a jet-absorption compound heat pump type gas water heater. Background technique [0003] The heating and hot water systems of public buildings (hotels, bathrooms, swimming pools, hospitals, etc.) in the main urban areas of most large and medium-sized cities in my country are mainly operated by gas water heaters. Usually, the exhaust gas temperature of gas-fired water heaters is between 140-200°C, and the heat loss is very large, so the thermal efficiency of conventional gas-fired water heaters generally does not exceed 92%. In order to improve thermal efficiency, people have developed condensing gas boilers based on the characteristics of relatively clean gas flue gas, low sulfur content, and high moisture content. Condensing gas-fired boiler recovers part of the...
Claims
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IPC IPC(8): F24H4/02F25B9/08
Inventor 梁世强郭永献桂小红陈伟成克用唐大伟李兰兰
Owner 江苏中国科学院能源动力研究中心