Compartment heat transfer coefficient test system and compartment temperature control system

Abstract

The invention provides a carriage heat transfer coefficient testing system and a control system for the temperature in the carriage. The carriage heat transfer coefficient testing system comprises a main-control computer, a PLC (programmable logic controller), a circulating fan, a heater, a temperature controller, a data collecting module, a power regulator, a data acquisition instrument, a temperature sensor and a controlled temperature sensor. The carriage heat transfer coefficient testing system and the control system for the temperature inside the carriage adopts a walk-in type high-low temperature humidity test chamber, so as to ensure the temperature sampling precision in the exterior of the carriage; through the circulating fan, the temperature uniformity in the interior of the carriage is ensured, so that the temperature sampling precision in the interior of the carriage is improved; the heater is adopted for heating, so as to meet the heating requirements of carriages with various volumes; the temperature controller automatically and precisely regulate the output current and the voltage of the power governor according to received signals, so that the heater is automatically controlled to heat to the set temperature; the precision of temperature regulation is high and the stability of the temperature regulation is good; the main-control computer per se conducts the calculation of the heat transfer coefficient according to the received data; the precision of the testing results is high.

Description

technical field [0001] The invention relates to the technical field of heat transfer coefficient testing, in particular to a vehicle compartment heat transfer coefficient testing system and a compartment temperature control system used for heat transfer coefficient testing. Background technique [0002] The heat transfer coefficient K value refers to the heat transferred through an area of ​​1 square meter within 1 hour (hour) when the air temperature difference on both sides of the enclosure structure is 1 degree (K, ℃) under stable heat transfer conditions, and the unit is W / ( square meter degree) (W / ㎡·K, where K can be replaced by °C). [0003] In the stage of product design and production finalization, in addition to the communication control system, power supply and other supporting systems, and various performance tests of the vehicle, it is also necessary to conduct appraisal tests on various functions and indicators of the carriage. The heat transfer coefficient is ...

AI Technical Summary

Problems solved by technology

[0006] However, before the above-mentioned test method automatically adjusts the temperature, it is necessary to use manual adjustment to heat the temperature in the compartment to near the set value, and then switch to the automatic adjustment state. In the actual test, manual adjustment is still required, although the adjusted temperature can be stable. It is near the set temperature value, but the error range is large, and the error reaches ±2°C

And this method controls the temperature through the temperature control circuit breaker. The temperature control circuit breaker needs an interval of 1 to 2 seconds for the on-off process, and the temperature fluctuation is relatively large.

Therefore, the heat transfer coefficient tested by this method has low accuracy and poor stability, and cannot provide a formal and traceable test basis for product finalization and factory inspection.

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