Efficient energy-saving heat exchange system utilizing LNG cold energy

Abstract

The invention discloses an efficient energy-saving heat exchange system utilizing LNG cold energy. The efficient energy-saving heat exchange system comprises a refrigerating box, an LNG gas cylinder,a heat exchanger assembly, an engine application assembly, a controller and a measuring sensor assembly. The controller is used for receiving an engine rotating speed signal transmitted from an electronic control unit ECU, an air temperature signal, transmitted from a first temperature sensor, in the refrigerating box and an LNG temperature signal, transmitted from a second temperature sensor, atthe outlet position of a heat exchanger and converting the engine rotating speed signal, the air temperature signal and the LNG temperature signal into a rotating speed signal of a variable frequencydraught fan to control the rotating speed of the variable frequency draught fan. When the LNG outlet temperature of the heat exchanger is higher than a set value A or the air temperature in the refrigerating box is lower than a set value B, the controller controls the variable frequency draught fan to stop running. After the controller controls the variable frequency draught fan to run, the rotating speed of the variable frequency draught fan is increased along with the increasing of the rotating speed of a natural gas engine. According to the system, the energy consumption of the variable frequency draught fan can be reduced, and the LNG cold energy is efficiently and safely utilized.

Description

technical field [0001] The invention belongs to the technical field of refrigerated vehicles, and in particular relates to a high-efficiency energy-saving heat exchange system utilizing LNG cold energy. Background technique [0002] With the development of social economy, the continuous improvement of people's living standards, and the increasing food transportation volume, the role of food cold chain in improving people's quality of life is becoming more and more significant. Refrigerated trucks can be used to transport meat, poultry, aquatic products, fruits, vegetables, dairy products, cold drinks, health food, etc., which can ensure the freshness and non-perishability of food, ensure the health of the people, and reduce food waste. To lower the car refrigerator to the temperature specified in the standard (about -18°C to +5°C, depending on the level of the refrigerated car), it is usually necessary to use an air conditioner. The air conditioner uses electric energy to r...

AI Technical Summary

Problems solved by technology

When the same air volume is used to flush different pipeline parts of the heat exchanger, the air volume will be insufficient for the pipeline with a lower temperature, and it is not conducive to the defrosting and drainage of the surface of the heat exchanger; for the pipeline with a higher temperature For the pipeline, the air volume will be too much, which will increase the energy consumption of the frequency conversion fan

Images