Automobile air-conditioner system capable of recovering cold energy of liquefied natural gas (LNG)

Abstract

The invention discloses an automobile air-conditioner system capable of recovering cold energy of liquefied natural gas (LNG). The automobile air-conditioner system mainly comprises three parts, i.e., an LNG cold-energy recovery heat exchanger, an air heat exchanger and a safety protection device, wherein the LNG cold-energy recovery heat exchanger is connected with a vaporizer in series; the air heat exchanger is used for blowing air at low temperature. The automobile air-conditioner system is characterized in that a coaxial sleeve type heat exchanger is connected in series in the traditional LNG automobile supplying system, the cold capacity recovered in LNG vaporization is supplied to the automobile air conditioner, and the cold supplying and the gas supplying are not influenced mutually; the rotating speed of a fan of the air heat exchanger is automatically controlled so as to realize automatic switching of the conventional air-conditioner air blowing and low-temperature air blowing and realize acquisition of the best heat comfort with limited cold capacity; and the safety protection device with freeze prevention, overpressure prevention and constant-temperature air supplying is adopted for ensuring reliable refrigeration and safe air supplying. The air-conditioner system is compact, practical, safe and reliable, not only is applicable to city buses and inter-city coaches adopting LNG as single fuel, but also is completely applicable to heavy trucks and common automobiles adopting LNG as single fuel according to the principle.

Description

technical field [0001] The invention relates to an automobile air-conditioning system which recycles and utilizes the gasification cooling capacity of liquefied natural gas. Specifically, the coaxial sleeve heat exchanger is connected in series with the LNG car vaporizer, and the cooling capacity of LNG gasification is absorbed by the alcohol solution in a closed cycle for car air conditioning. More specifically, the car air conditioner supplies air at low temperature. Background technique [0002] Affected by energy shortage and environmental protection, natural gas vehicles have occupied an important position in urban transportation vehicles. Compared with compressed natural gas, liquefied natural gas (Liquefied Natural Gas) has many excellent characteristics as a vehicle fuel, such as high energy density, low storage pressure, and no moisture and other condensable impurities, so it is recognized It is a more economical, safer and cleaner new energy for vehicles. At pre...

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Problems solved by technology

[0004] However, if the above-mentioned LNG cold recovery schemes are directly used in automobile air conditioners, there are problems to varying degrees.

If the cold recovery method of direct heat exchange is adopted, the water vapor in the air will inevitably freeze on the surface of the heat exchanger due to the large temperature difference heat exchange, which will affect the reliability of heat exchange.

If the cold recovery method adopts indirect heat exchange, most of them have problems such as bulky equipment, complicated system pipelines, mismatch between the heat load required by the automobile air conditioner and the actual gas consumption of the engine, and the actual cooling capacity recovered by the air conditioner, which makes it difficult to meet the heat requirements of the automobile air conditioner. Objective requirements such as large wet load, limited layout space, high requirements for anti-vibration performance, and the coordination and unity of automotive air conditioners and vehicle interiors

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