LNG cold energy utilization air conditioning system and control method

Abstract

The invention provides an LNG cold energy utilization air conditioning system. The system is characterized in that an LNG tank is connected to an LNG inlet of a first vaporizer through a pipeline, andan LNG outlet of the first vaporizer is used for leading to an engine; a parameter input module is used for inputting parameters required by control to an ECU; the ECU is connected with and controlsa refrigerant circulating pump and an electric control three-way valve correspondingly; the refrigerant circulating pump is connected to the first end of the electric control three-way valve through apipeline, the second end of the electric control three-way valve is connected to a refrigerant inlet of the first vaporizer through a pipeline, and a refrigerant outlet of the first vaporizer is connected to a regenerator inlet through a pipeline; the third end of the electric control three-way valve is connected to the regenerator inlet or the pipeline between the first vaporizer and the regenerator through a pipeline; a regenerator outlet is connected to a refrigerant inlet of an air conditioner heat exchanger through a pipeline, and a refrigerant outlet of the air conditioner heat exchanger is connected to the refrigerant circulating pump through a pipeline; and a refrigerant temperature sensor is arranged on the pipeline at the refrigerant inlet of the air conditioner heat exchanger.The LNG cold energy utilization air conditioning system improves the utilization efficiency of LNG cold energy.

Description

technical field [0001] The invention relates to the field of vehicle refrigeration control, in particular to an air conditioning system utilizing LNG cold energy. Background technique [0002] As a clean and efficient energy source, natural gas is of great significance to the prevention and control of air pollution in my country. In recent years, my country's natural gas consumption has grown rapidly. As a liquid form of natural gas, LNG is a liquid formed when natural gas is purified and cooled to below -162°C. Its existence increases the flexibility of natural gas storage, transportation and utilization, and expands the capacity of natural gas scope of application. Compared with traditional gasoline and diesel, natural gas has the advantages of low price, low density and high calorific value, which makes natural gas vehicles fully developed. [0003] LNG will release a large amount of cold energy during the gasification process, with a value of about 830-860kJ / kg. Under n...

AI Technical Summary

Problems solved by technology

[0005] In the air conditioning system using cold energy, if the flow rate of the refrigerant (ethylene glycol aqueous solution) is too low, the temperature of the refrigerant in the pipeline will drop too much, causing the refrigerant to freeze and affecting the normal operation of the air conditioner

If the refrigerant flow rate is too large, when the refrigerant transfers cold energy to the air in the air conditioner heat exchanger, the temperature difference is too small, the cold energy cannot be fully utilized, and energy is wasted

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