Defrosting control method for double-unit auxiliary cooling system

Abstract

The invention provides a defrosting control method for a double-unit auxiliary cooling system. The double-unit auxiliary cooling system comprises a first auxiliary cooling unit, a second auxiliary cooling unit, a controller and a cargo hold, and the controller controls the first auxiliary cooling unit and the second auxiliary cooling unit to adjust the temperature of the cargo hold. The defrosting control method of the double-unit auxiliary cooling system comprises the steps that: the running state of the first auxiliary cooling unit is obtained; whether the first auxiliary cooling unit meets the defrosting condition or not is judged; when the first auxiliary cooling unit reaches the defrosting condition, the operation state of a second auxiliary cooling unit is obtained; and the first auxiliary cooling unit and the second auxiliary cooling unit are controlled according to the operation state of the second auxiliary cooling unit. According to the defrosting control method for the double-unit auxiliary cooling system, temperature fluctuation in the cabin can be reduced to the maximum extent, the operation efficiency and reliability of the system are improved, and the comprehensive performance of the system is enhanced.

Description

technical field [0001] The present application relates to the technical field of air conditioning, in particular to a defrosting control method for a dual-machine auxiliary cooling system. Background technique [0002] Cargo aircraft generally use containers to transport goods. Since the environment-controlled air-conditioning package of cargo aircraft has limited adjustment to the ambient temperature (generally above 16 degrees), it is impossible to use its own environment-controlled air-conditioning package to achieve temperature control for fresh-keeping goods that require a temperature lower than 10 degrees. Therefore, it is necessary to use a container with built-in refrigeration function, but this type of container needs to have its own battery, and the built-in battery also needs to be charged, which is large and heavy, which increases the transportation cost and is generally economical. [0003] The auxiliary cooling system of cargo aircraft can adopt a vapor compres...

AI Technical Summary

Problems solved by technology

However, when the auxiliary cooling system works for a long time, the evaporator is likely to produce condensed water. If the surface temperature is too low, it will easily cause frosting on the evaporator and reduce the cooling effect; when the system is defrosting, the evaporator has no cooling output, which will cause If the defrosting time is too long, the temperature in the cabin will rise even higher, and the system will re-refrigerate after exiting defrosting, which will exacerbate temperature fluctuations in the cabin.

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