Airbus A320 air-conditioning systems over temperature fault finding and ruled out - refrigerated condenser - HVAC Industry

Airbus A320 air-conditioning systems over temperature fault finding and ruled out - refrigerated condenser - HVAC Industry

Shanghai summer high temperature for the airfield, air conditioning duration, failure of high frequency, in order to ensure flight punctuality, improve service quality, over-temperature air conditioning system on the A320 made the following troubleshooting shallow views:

To 10,000 m altitude aircraft using engine bleed air, for example, for air conditioning Cooling Components describe the basic working conditions: from the flow control valve (FCV) of the bleed air first enters the primary heat exchanger to cool the first time, from the post after pre-cooling device down to about 200 , 135 , and then After the compressor part of the ACM, bleed air temperature rose to about 180 , cooling it with the outside air temperature increases with the press, allowing better heat exchanger in MAIN to generate a better effect of heat exchange to about 20 or so, this part of the airflow through the heater and re- Condenser In from the ACM turbine air flow of condensate exports under, so that hot water vapor in the air condenses into liquid, followed by the water separator in the role of the use of centrifugal force to separate the condensed water will reach all parts of this part of the cooling water introduced Punching the air with the import pipeline, and the cooling ram air mixture into the heat exchanger, using water, the characteristics of relatively large heat exchanger of the heat exchange capacity to be greatly improved, the water was separated airflow into the heater and then heated to reduce the flow of the ice, and then enter the ACM turbine, with a flow of kinetic energy to drive ACM work at the same time, the temperature has dropped to the lowest point PACK component temperature -50 . After going through the condenser and then into the mixer. PACK components to complete the entire cooling and water separation function. (FIG :21-52-00-001FIG003) air-conditioning cooling system failure is the largest part of the A320 aircraft, and the following of our air conditioning cooling system fault analysis and discussion:

A fault description of the phenomenon

To rule out a fault, the fault phenomena, we need to have a certain understanding, and for air conditioning cooling system failure, due to the work of the entire system of internal and external Environment Changed greatly and the computer Monitor Lack of capacity, so more difficult fault location, which prompted us to go looking for more data to analyze and judge. We report the units have air-conditioning cooling system failure, shall have to collect the following information: ECAM warnings, and status information and CFDS information; manually set the air conditioning working environment: the flow selector position, the regional temperature selector position; external environment: outside air temperature, place the location (altitude or the ground, how much above sea level); the inner workings of state: bleed air pressure and temperature, flow control valve opening, the compressor exit temperature, PACK exit temperature, pipe temperature, cockpit regional temperature, the thermal air-conditioning valve opening.

Second, failure to confirm This procedure allows you up from the subjective understanding of the true state of failure, it is different from the previous step in the PFR from the user's mouth and get the information in the record, it is not only a simple fault representation, its can make you more intuitive and more comprehensive to understand the failure. As a result, the need to understand these phenomena, we must also know the ram air import and export air door opening, feeling the size of the ram air inlet pressure, air-conditioning in the noise is normal, water separator injector pipe whether there is sufficient water discharge, and accordingly the system testing (including testing and operational testing CFDS).

3, fault isolation and exclusion This process is the effective use of information obtained by the analysis of the failure to develop programs and methods of troubleshooting the stage, so the entire row of the core. The air conditioning cooling system failure, need to refer to work orders related to TSM to complete, the general need to understand the work in the air conditioning system bypass valves, anti-ice valve is working properly, the temperature Sensor (Especially the compressor outlet temperature sensor and water - from the outlet temperature sensors) are normal.

4, the tracking failure As air conditioning cooling system troubleshooting and sometimes the environmental and the environment in which failure occurs, inconsistent, or because of the failure of a component failure caused by other components in the replacement of the second fault after fault conditions fault phenomena disappeared, can not be the actual main cause found, which may result in failure of repeated, so we need to trace the fault accordingly.

5, fault summary Real troubleshooting is based upon the accumulation of experience, not a good summing up the failure mechanism is not able to make arrangements so do the job, completed only after a good summary of the real row that finished fault . It will also work after the row it play a multiplier effect. The following are my air conditioning cooling system for some of the overheating fault of Experience:

Height PACK outlet temperature higher, but other parameters normal. Reasons of the ACM: ACM is in the air conditioning in the high altitudes of the most influential part, due to its use of air bearings, while the height of the external air pressure is low, causing the gas bearing load bearing capacity is less than low-status, in wear and tear gas bearing zones in the case, when high-altitude work more easily lead to abnormal ACM.

1, only the high-altitude high compressor outlet temperatures: FCV, ACM

Reasons of: the air conditioning in the ACM is the height of the most influential parts, then because of its use of the air bearing, and altitude of the external air pressure is low, causing the air bearing load bearing capacity is less than low-status, wear and tear gas bearing zones in the case of high altitude is more easily lead to ACM when the work is not normal, why doubt FCV, is due to open in FCV spent in large, resulting in ACM Exceed Speed (P/N757A * N "40000RPM; P/N1263A * N "42000RPM), resulting in ACM is not working.

2, the high outlet temperature of the ground PACK: PRIMARY / MAIN heat exchanger, then heater, condenser (such as condensed water was significantly reduced, giving priority to doubt condenser)

Cause analysis: As the air conditioning cooling systems work by the external and internal environment of large, this situation is indeed difficult to distinguish, or even likely that the overall efficiency in the workplace. Here we use the usual experience hope to find more possible abnormal conditions. At the same time, we propose to first understand the components of life, in accordance with its repair or cleaning after the last use of time to develop to replace those parts of the sequence, and through several change of experience, to develop an appropriate part of our own cleaning cycle. Here, we do not have to suspect ACM, not because the components will not cause PACK exit temperatures are high, but once there it ACM

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