Based on the author's years of work experience, this paper introduces the office space.

In the light of several problems existing in the installation and maintenance of central air conditioning in the research institute, this paper puts forward some concrete solutions.

Decision countermeasures. I hope it will be helpful to practical work.

Central air conditioning; Installation and maintenance; Office space; exist problem

1。 Excessive noise of air conditioning terminal equipment and its treatment

The noise of air conditioning terminal equipment exceeds the standard, which is a common problem in practice.

Acoustic problems of equipment. Fan coil units are relatively mature in technology, while China

The products of many domestic manufacturers can meet the standards. However, the situation in windy units is different.

Satisfactory, the measured value of noise is often higher than the product sample parameters provided by the manufacturer.

Less. The author has come into contact with two projects where the noise of terminal equipment exceeds the standard: one is

Mufflers are installed at the entrance and exit of the crane cabinet, but the noise of the equipment itself exceeds the standard.

More from the return air; For example, the import and export of cranes and cabinets are not set.

Therefore, the indoor noise measured during the trial operation far exceeds the related indoor noise.

Standard. Finally, these two projects are reduced by reducing the speed of the fan with frequency converter.

Ha, but the cooling effect of the air conditioner is also greatly affected.

Therefore, the noise parameter requirements of the equipment should be indicated in the design, and at the same time, for strong winds,

Noise elimination and sound insulation measures should be considered in the design of measuring unit. Set the time when the equipment comes into play.

When unpacking inspection, it is best to conduct power-on trial operation before installing large air volume units.

At present, the problem of excessive sound can be replaced, returned or modified in time.

Application and other processing methods, to avoid the late installation and debugging stage of the project to find that the unit has been.

The problem of acoustic addiction has caused a big rectification.

2. Circulation problems and solutions of air conditioning water system.

Water system is the most important and key environmental protection book in central air conditioning project.

Problems will directly affect the normal work of the system. Central air conditioning chilled water system

Poor pipeline circulation in chilled water system is a common problem in deceleration. Because pipeline circulation is not

One of the good reasons is that there is no coordinated treatment in pipeline construction due to the intersection of various professional pipelines.

Ok, there are many airbags in the pipe network, which affects the circulation of the pipe network. The second is air conditioning water.

Inadequate cleaning of system pipes directly causes circulation blockage of air conditioning water system.

According to years of practice, the author thinks that solving the first problem

Is to strengthen the management before construction, reasonable arrangement of pipeline elevation, try to avoid gas.

Bag phenomenon, at the same time, an exhaust valve is set at the inevitable airbag position, and the exhaust gas is discharged.

The exhaust pipe of the valve is connected to a safe place to facilitate the system exhaust. For the second question, it should be

Pay attention to several aspects from the construction process: first, install welded steel pipes.

Before cleaning the inner and outer walls of the pipeline, dirt and rust spots must be removed by mechanical or manual means.

After that, close the nozzle for installation. In the process of pipeline construction, the unclosed nozzle should be temporarily closed.

When plugging, in order to avoid dirt, welding slag and hemp fiber should be removed in time at the joint of the pipeline.

And other sundries. Second, the automatic or manual exhaust valve is set at the top and the lowest part of the pipe network.

Install a relatively large drain valve. If the valve of the blowdown valve is too small and the blowdown effect is not good,

Cleaning times should be more, if it is not in the lowest place, sewage discharge will not be complete. Finally, the pipe network is safe.

Temporary filters and bypass flushing valves should be appropriately added during installation, and the connecting equipment should be

Before, combined with the water pressure test, cleaning was carried out in sections to avoid clogging the equipment with dirt. cleaner

After completion, the trial operation of water system circulation should be carried out in order to connect the pipe network.

Clean the dirt in the filter, and then remove the filter to remove the dirt.

Things.

3. Problems and treatment of dripping caused by improper installation

There are many reason for that problems of drip and sleeping in the debugging and operation of air conditioning system,

To sum up, there are two main reasons: pipeline installation and heat preservation. Pipes and pipes

The connection between parts, pipes and equipment is not tight, and the main reasons for water leakage are: pipes.

The installation did not strictly follow the operating procedures. The quality of pipes and fittings is poor,

These materials were not carefully inspected when they entered the site. The system did not treat water strictly according to the specifications.

Stress test. Common problems caused by improper installation of condensate pipes are:

(1) The condensed water pipeline is too long, so it is difficult to ensure that it matches the ceiling or slope during installation.

Even the condensate pipe is inclined downward, causing dripping phenomenon: the condensate pipe of air conditioning unit is not available.

Condensed water generated by water seal of the unit cannot be removed.

(2) The solution to the installation problem in the construction of the above condensate pipes is condensation.

Drainage should be as close as possible to prevent condensate from accumulating on the slope of condensate pipe or competing with the ceiling.

Phenomenon; The condensing water pipe of the cabinet machine should be sealed according to the negative pressure inside the machine for condensation.

The water is discharged smoothly.

The main reasons for thermal insulation are: insufficient packing density of thermal insulation materials or thermal insulation materials.

The thickness of the material is uneven, and as a result, the external surface temperature of the thermal insulation material reaches condensation during operation.

Point temperature and condensation. The insulation material is not tightly combined with the outer wall of the pipeline. empty

The end of the water pipeline is not closed, which produces moisture and insulation layer, leading to knotting.

Dew. The dripping of freezing pipe through wall is mainly caused by poor heat preservation or poor heat preservation.

The moisture barrier of the material is damaged. The drain of the air grid coil drip tray is mixed with heat preservation material.

Things are blocked, and the condensate pipe is not cleaned and drained in time after installation.

Experiment. Insulation materials of hanging cabinets and fan coil drip trays are damaged and drip.

The water tray is dewy.

In view of these problems, the main solutions are: first, strengthen the entry of thermal insulation materials.

Check. It is necessary to strengthen the technical disclosure before construction and the inspection during construction, and it is forbidden to use large pieces.

Thermal insulation sleeve should be sheathed with small tubes, and elbows, valves, flanges and equipment interfaces should be strengthened.

Control the insulation quality of details to ensure that the insulation layer is closely combined with the outer wall of the pipeline.

Secret. Third, the freezing pipe in the wall-penetrating part is equipped with heat preservation and protection sleeves, and inspection is strengthened to ensure that

Continuity and rigor of thermal insulation layer in wall-penetrating parts. The fourth is to strengthen the ceiling first and then seal the board.

Objective To clean and check the sundries in the fan coil water tray. Fifth, strengthen the drip tray of the equipment.

Protection, especially the inspection before ceiling sealing plate.

4. Selection and treatment of fire prevention and smoke exhaust air valve.

Once there is a fire in the office, it will often cause serious casualties.

Economic loss. In order to minimize the losses caused by fire, it is necessary.

Take effective fire prevention and smoke prevention measures to control the spread of fire. And fire prevention and exhaust.

Smoke control valve plays an important role in the rational design of ventilation, air conditioning and smoke control system.

Important role. Fire damper refers to the air supply and return duct installed in ventilation and air conditioning system.

On the road, it is usually open. When the gas temperature in the pipeline reaches 70~C, it will prevent fire.

When it is automatically closed, it can meet the fire stability and fire integrity in a certain period of time.

Requirements, valves that can prevent smoke and fire; Smoke exhaust valve refers to the pipeline installed in the smoke exhaust system.

On the road, it is usually closed and automatically opened in case of fire. When the temperature of the gas in the pipeline

When it reaches 280qC, it will automatically close, which can meet the requirements of fire stability and

Fire integrity requirements, smoke and fire dampers. There are many fire prevention and smoke exhaust valves.

Many models mainly evolved from the above two categories.

In the implementation and management of air conditioning engineering, some problems often appear.

These questions are still very difficult. This requires us to do a good job in quality control, empty

Understand the design intention before adjusting the project construction and be good at grasping the control points of the project.

Do a good job in the management of control points before, during and after the event, and the construction should be purposeful and targeted.

Sex, point control, which is conducive to our project quality management work better.

All right. .

refer to

[1] Liang Lunwen. How to do well the construction management and installation of central air conditioning Ⅱ?

Sichuan Building Materials, 2006, (O6).

[2] Huang Zhu. Discussion on installation and construction technology of air conditioning and refrigeration system Ⅱ. build

Materials and Decoration (next issue), 2007, (1 1).