Supervision method and key points of ventilation and air conditioning engineering debugging?

The following is the supervision method and key points of ventilation and air conditioning engineering commissioning brought by Zhong Da Consulting for your reference.

After the ventilation and air conditioning system is assembled, it must be debugged to check whether the design and construction effect can meet the requirements of the use function. Debugging is a very important work in installation engineering. At present, most projects are hastily started and put into use. After the system is assembled, it will be debugged and put into use as soon as the wind blows cold. Such consequences will bring great hidden dangers to future use. Air conditioning can not meet the design requirements, air quality can not meet the health standards, ventilation can not meet the design requirements, will make harmful gases in the working environment exceed the standard, thus causing harm to the human body. The smoke exhaust and positive pressure air supply system do not meet the design requirements, and the system cannot operate normally in case of fire, endangering people's life safety.

In the past quota, the debugging cost was regarded as a separate cost, which was calculated based on the installation labor cost, reflecting the importance of installation and debugging in terms of cost. Debugging not strictly in accordance with the specifications is a serious jerry-building behavior, and non-professionals will not notice it.

This paper briefly summarizes the supervision methods and key points of ventilation and comfort air conditioning engineering debugging.

Supervision mode of ventilation and air conditioning engineering debugging

The debugging methods of ventilation and air conditioning engineering should be patrol, sampling and standby, which should be implemented by professional supervision engineers.

When debugging a single machine, the supervision engineer should take the way of standing by to check whether the wiring of the equipment and the combined state of each assembly part meet the requirements of the equipment installation instructions.

In the process of system adjustment, the supervision engineer should take the form of patrol, and the main contents of patrol are: 1. Whether the debugging personnel are qualified. 2. Test whether the adjustment method is correct. 3. Whether the debugging record is complete. 4. Whether the debugging process is carried out as planned. 5. Whether the debugging progress is in line with the plan.

After the commissioning of the construction unit is completed, the supervision engineer shall conduct spot checks according to the specification requirements after submitting the inspection report. Check content: 1. Whether the equipment operation parameters meet the requirements of equipment technical specifications. 2. Whether the parameters of the terminal equipment meet the design requirements. 3. Whether the indoor parameters meet the design requirements. 4. Whether the action of the control mechanism meets the design requirements.

Supervision points of ventilation and air conditioning engineering

1. Carefully review the construction drawing. In air conditioning engineering, we should focus on the following aspects: (1) Whether the indoor and outdoor design parameters are selected correctly. ⑵ Whether the fresh air volume of fresh air outlets in each room is marked and whether it can meet the requirements of indoor personnel. (3) Whether the air volume of equipment at the end of each room meets the requirements of air exchange times and whether the cooling capacity meets the requirements of room load. (4) Whether the total air volume and fresh air volume of the system are marked and can meet the requirements of the whole system. 5] Whether the equipment parameters of refrigeration equipment, heating equipment, cooling tower and fan meet the system requirements. [6] Whether the setting of various control valves is reasonable. Once the automatic control equipment is scientific and applicable. Being safety and vibration reduction equipment is complete.

In the ventilation system, we should focus on the following aspects: (1) Whether the total air volume of the system is marked and whether it can meet the needs of diluting the air exchange times of pollution sources. ⑵ Whether the equipment parameters of the fan meet the system requirements. (3) Whether the setting of the valve meets the regulation requirements.

In the smoke exhaust system, we should focus on the following aspects: (1) Whether the smoke exhaust quantity is marked and whether it can meet the requirements of the smoke exhaust partition. ⑵ Whether the setting of smoke outlet is reasonable. (3) Whether the setting of fire damper is reasonable. (4) Whether the selection of exhaust fan matches the needs of the system.

In the positive pressure air supply system, we should focus on the following aspects: (1) Whether the total air supply is marked and whether its selection meets the requirements. ⑵ Whether the maintained positive pressure range is marked and meets the requirements. (3) Whether the setting of positive pressure air supply outlets is reasonable, and what is the air volume of each outlet. (4) Whether the tuyere opening sequence is reasonable. 5] Whether the selection of exhaust fan matches the needs of the system. [6] Whether overpressure exhaust equipment is considered.

2. The qualification examination and debugging of debugging units and personnel shall be conducted by the installation unit or a qualified debugging unit entrusted by the installation unit. Ordinary installation workers are generally not competent for debugging work, and should be organized and implemented by experienced professional and technical personnel, and the number of personnel should meet the requirements of debugging work.

3. Carefully review the commissioning plan of the construction unit. According to the requirements of the specification, the construction unit should prepare the debugging plan before debugging. The supervision unit shall review the commissioning plan. When reviewing the plan, we will focus on the following:

(1) Whether the debugging program is correct. Debugging should be carried out according to the following procedures: ① Single machine commissioning. ② Joint debugging without production load. ③ System linkage debugging. For common civil buildings, only these three steps can be debugged. For the production process system, it is necessary to measure and adjust the comprehensive efficiency with the production load.

⑵ Whether the debugging method is correct. When debugging a single machine, small equipment is carried out by the installation unit, and large equipment, such as large refrigeration units and boilers, is generally debugged by the manufacturer. Before debugging, check the wiring and assembly of all parts of the equipment against the wiring and installation instructions again, and then try to start it. After confirming that there is no abnormal sound, run continuously according to the operation time specified in the manual. In the meantime, adjust the operating parameters of the equipment.

After the single-machine trial run is qualified, joint trial run and commissioning without production load shall be carried out.

The main contents of measurement and adjustment of air conditioning system include: ① measurement and adjustment of air volume of air conditioning system (including total air volume of the system and air volume of each terminal tuyere). When the system is installed, a measuring hole should be installed on the main pipe. When measuring and adjusting the total air volume, the total air volume of the fan should be measured in this part, and then the air leakage should be measured according to Appendix A of the specification. Total system air volume = total fan air volume-air leakage. The measurement and adjustment of system air volume can adopt the "reference tuyere method", so a "tuyere air volume calculation table" should be made in this scheme, and the measurement results of each time should be recorded in the table for adjustment. ② Measurement and adjustment of air handling equipment (new fan, fan coil, etc.). ). The test and adjustment of air handling equipment should be carried out under outdoor design conditions, and the general installation may not be in the season of outdoor design conditions, so this part of the work can only be carried out when conditions are available. ③ Measurement and adjustment of air state parameters (temperature and humidity) and air distribution in air-conditioned rooms. When the system is basically stable, some representative points can be selected to measure the indoor temperature and humidity. During working hours, it shall be measured every 0.5~ 1.0 hour. In order to stabilize the air parameters of an air-conditioned room, the room should maintain a positive pressure of no more than 50N/m2. ④ Measurement and adjustment of noise elimination effect of the system. If there is noise in the room, it is necessary to measure the noise with a sound level meter to ensure that it is controlled within the design requirements. ⑤ Determination and adjustment of chilled water and cooling water systems. The regulation of this part should be carried out together with the air system under the designed outdoor conditions, and the total water quantity of the regulation system and the water quantity of each air treatment equipment should be determined.

The debugging contents of smoke control and extraction system include: ① adjustment of smoke outlet action. Each smoke outlet should be opened and closed according to the design requirements. ② Measurement and adjustment of exhaust air volume.

The debugging contents of positive pressure air supply system include: ① the adjustment of air supply outlet action. Each air supply outlet should be opened and closed according to the design requirements. ② Measurement and adjustment of air supply volume. ③ Measurement and adjustment of positive pressure. Adjust the overpressure exhaust equipment and system valves to make the indoor positive pressure meet the relevant provisions of fire protection and design.

(3) Review whether the debugging instruments and tools meet the debugging requirements. Debugging instruments should be complete, the performance should meet the test requirements, and the debugging tools needed for debugging should be self-made or purchased as needed. The instruments and tools used for debugging mainly include: ① Dry and wet bulb thermometers. ② Anemometer. ③ Differential pressure gauge. ④ Orifice flowmeter. ⑤ Rectifier grid. ⑥ Sound level meter.

(4) Whether the time schedule meets the requirements of schedule and debugging procedures. According to the size of the workload, carefully review the arrangement of the number of debugging personnel and the arrangement of working procedures to avoid anticlimactic.

4. Supervision of debugging process

(1) Write the detailed rules for entrusted supervision, and the supervision unit shall write the detailed rules for supervision in strict accordance with the requirements of supervision specifications, so that the construction unit and the construction unit can clearly define the control procedures and means of supervision, as well as the inspection links and inspection data.

⑵ Urge the construction unit to carry out technical disclosure, and the efficiency and smoothness of debugging play an important role in technical disclosure.

(3) Stand by and debug the single machine and test the total air volume and water volume of the system. These tests are relatively important and the workload is relatively small, so the supervision engineer should choose the mode of standby.

(4) For the adjustment of the air volume of the system, we can inspect whether the debugging work is carried out as planned, whether the debugging personnel are determined in the plan, whether the test instruments meet the requirements, and whether the test results are carefully and accurately recorded.

5] After the construction unit completes the written inspection after debugging, the supervision engineer shall conduct spot checks on the projects that have not been taken aside according to the frequency required by the specification to ensure that all projects meet the design requirements.

[6] After confirming the debugging results, the construction unit is required to mark and fix all the adjusted valve positions.

Once in this system after debugging, but also according to the requirements of the control center for linkage debugging. Especially after the fire signal is issued, the air conditioning system in the corresponding position should be closed, the smoke outlet should be opened, the smoke exhaust fan should be started, and the positive pressure fan should be started.

Although the debugging quality of ventilation and air conditioning engineering is not very intuitive, it is a very important work, which plays a vital role in the use quality of the whole system and even the safety of people's lives. I hope it can attract the attention of all parties concerned in engineering construction.

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