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Central air-conditioning laboratory equipment

Central air-conditioning laboratory equipment | Central air-conditioning experimental bench | Central air-conditioning training bench

With the popularization and application of central air-conditioning, central air-conditioning has been used more and more widely in many shopping malls, hotels, office buildings, commercial and residential buildings. Central air high-profile design, management, and maintenance are also increasingly important in modern life. In order to facilitate people to understand and learn the basic principles and basic knowledge of central air-conditioning, and to master its management, maintenance and repair methods, the company's professional and technical personnel develop and produce central air-conditioning experimental equipment products. ( Teaching Equipment | Teaching Instruments )
中央空调实验室设备|中央空调实验台|中央空调实训台

First, the salient features of central air-conditioning experimental equipment
1. It adopts fully transparent materials, and the mold is formed at one time, which is intuitive and helpful to teaching.
2. Reasonable overall design, beautiful appearance, simulation and small size.
3. The refrigeration system and heating system are equipped with multi-level protection measures to ensure the safe and reliable operation of the equipment.
4. The refrigerating system adopts all copper material, which has good efficiency and long service life.
5, comprehensive functions, can be cooled and heated, and has an analog demonstration system, and all fault settings.
6. It has a microcomputer communication interface, which is convenient for remotely controlling the working status of the experimental equipment and collecting relevant data of the item.

Characteristics and working principle of main components of central air-conditioning laboratory equipment
1. Compressor; The system adopts a fully-enclosed piston compressor. The normal working temperature is only 0OC, which is safe and reliable, compact in structure, low in noise, and has a good seal. The refrigerant is R22.

2. Evaporator: The refrigeration system uses a transparent water tank type evaporator, which is easy to observe. At a glance, the evaporator group is immersed in water, the preparation evaporates in the tube, and the water flows in the water tank under the effect of the pump to enhance the cooling effect.

3. Condenser: The refrigeration system uses a spiral tube condenser. This is a newer type of heat exchange equipment. It is made of two parallel copper coils. It is a spiral body with two spiral channels. The middle spiral body is for cooling. Water channel, the external spiral is the channel of high-pressure refrigerant.

4. Spray cooling tower: The condensing method of this equipment adopts a counterflow cooling tower. The mold is formed at one time and has a completely transparent structure. The suction fan is installed on the top of the tower. The structure is completely simulated and intuitive. The tower is filled with fillers to improve the cooling effect; after the warm water from the condenser is pumped by the cooling water to the tower top, the nozzle of the water distributor is rotated and sprayed downward.

5. Boiler: The boiler is the core component of the central air-conditioning heating system. The top Grae electric heating pipe is used to completely isolate water from electricity. It has over-temperature protection, anti-dry burning protection, and over-pressure protection to ensure human and machine safety. Imported ammonia Foam insulation technology, good insulation performance.

6. Simulation room: The simulation room is made of fully transparent plexiglass. It has a beautiful appearance, small size, small footprint, and compact structure. It has a fully transparent structure at a glance. The room is equipped with coils, coil fans, and temperature control regulators.

7. Temperature control: The panel of the test bench of this equipment is equipped with a temperature control display, which can control the temperature range, and the temperature of each key part is detected on a tour.

8. Simulation demonstration: the equipment is equipped with a 500mm * 300 mm system working demonstration board, using epoxy copper clad board, four colors (red, green, blue, yellow), LED image, realistic display of temperature Working status.

9. Temperature control detector: The two-phase analog room is equipped with a digital display temperature control regulator, and the temperature range can be set by itself; the instrument can automatically adjust the temperature to the set value according to the specific conditions of the room temperature setting.

10. High and low voltage protection devices: For safety reasons, the refrigeration system is equipped with high and low voltage protection relays to protect the normal operation of the compressor and the system.

11. Water tank: In order to save the water resources of the water recycling system, the water tank is used to complete the tasks of adding, adjusting and filtering the media water. It is also equipped with an automatic water filling system. .

12. Central control part: The overall control part of the test bench can complete the tasks of switching between cooling and heating of the equipment, and closing in the cooling or heating state. The startup mode is all microcomputer mode. The weak switch signal is used to control the microprocessor and drive the circuit to work, thereby extending the service life of the device.

13. Microcomputer interface and control part features: There are two ways to control and parameter display of the central air-conditioning teaching experiment system: the first way is to control the working status of each part by the keys on the control panel of the experimental bench, Setting of parameters and dynamic display. The second method is to communicate through the serial interface of the single-chip microcomputer (the main body of the experimental system uses the current advanced single-chip microcomputer as the main chip), and is equipped with application software in Chinese, so that the various control and Various parameters that need to be displayed can be completed on the screen of the microcomputer.

Third, the main technical parameters of central air-conditioning experimental equipment

project

The main technical parameters

Refrigeration

Heating

power supply

~ 50Hz 220V

rated power

2900W

2300W

Rated current

14.0A

11.0A

Refrigerant

R22 5Kg

Dimensions

350 × 220 × 280 (cm)

Cooling water pump

2.5 m 3 / h head> 15 m

Refrigeration water pump

1.8 m 3 / h head> 15 m

Hot water pump

1.8 m 3 / h head> 15 m

Simulation boiler

1800W 8.5A

Fan coil

3500 m 3 / h

Hot and cold air pipe

Exhaust heat 1.6KV; Exhaust heat area 8.5m 2

Blower

2100m 3 / h

Instructions

(1) Preparation before experiment

Turn on the current of the main console and close the air switch. First, check whether the information on the computer console is normal and observe whether the green light is flashing. If not, check the input interface or power supply. Then, select the "Cooling" button with the selection button to pre-fill water.

Pre-add water on the condenser side: Fill the water into the water pan of the cooling tower, close the shut-off valve F10, set the cooling water pump button K1 to work (green light is on), until the condenser water is full, and the condenser water tank is full of water. Is it possible to observe through the plexiglass plate (note: water cannot fill the condenser shell). After filling the water, turn off the cooling water pump and open the shut-off valve F10.

Pre-fill water on the evaporator side: Close the shut-off valves F3 and F4, open the shut-off valve F2, set the cooling water pump button K3 to the working state (green light is on), and add water from the expansion tank to the evaporator. When it is full, the evaporator tank is full of water Whether or not can be observed through the plexiglass plate, after adding, turn off the cooling water pump and close the shut-off valve F2.

Boiler test pre-filling: Open the shut-off valves F3, F4 and drain valve F6, close F1, F2, set the hot water pump button K7 to work (green light is on), and add water to the boiler until the drain valve F6 has a large amount of water flowing out. Then close F6, turn off the hot water pump, stop adding water, and then close the shut-off valve F4.

(II) Operation process

1. Refrigeration experiment

After ensuring that the water is full, open the shut-off valves K1 and K2 and close the shut-off valves F3 and F4. The cooling water pump K1, the cooling fan K2, the cooling water pump K3, the compressor K4, the solenoid valve I K5, and the solenoid valve II K6 are in working state (green light is on), and the hot water pump K7 is turned off (red light is on). Select the function button to select "Refrigeration", put the refrigeration temperature control sensor into the evaporator, and the current temperature of the evaporator is displayed. Select the setting button according to the requirements and determine the temperature. (Note: The setting temperature must be lower than the temperature of the evaporator at that time, otherwise the compressor cannot work.) At this time, the cooling indicator light is on.

When cooling to the set temperature, it will stop automatically. Before the second start-up, it is advisable to set the compressor delay time to 8-10 minutes, so that the pressure is balanced before starting.

2. Heating experiment

Turn on the console power, turn on the simulated boiler heating button, and turn the rotary button to about 40 ℃. Open the shut-off valves F3, F4, close the shut-off valves F1, F2, the hot water pump is in working state (green light is on), turn off K1, K2, K3, K4, and select the function selection button "Heating", then, Select the setting button according to the requirements to determine the temperature. At this time, the heating indicator lights up red. When the heating reaches the set temperature, it will automatically stop.

3. The temperature survey and wind speed adjustment are controlled by a microcomputer, which can display all current temperature and set temperature at the same time.

For manual control, you need to press the temperature display button to observe the current temperature through the temperature display. The simulation room can be opened and closed as required, and the wind speeds Ⅰ, Ⅱ, and Ⅲ are used for demonstration. The simulation air duct is demonstrated based on the tuyere Ⅰ (diffusor) and tuyere Ⅱ (adjustable diffuser). In order to achieve the best demonstration effect, please perform a simulation of the room and the simulation of the air duct.

Central air-conditioning failure, failure phenomenon and recovery method

(1) Refrigeration failure

Serial number

Fault name

Failure generation method

Failure phenomenon

Troubleshooting

Note

1

Fluoride Leak

Defluorination from shut-off valve JF4 fluorine filling port

The fan coil has no cold air, the system pressure is low, and the liquid pipe is frosted after the expansion valve

Add fluoride to normal

*

2

Too much fluorine

1.2% current from compressor with fluoride from stop valve JF4 fluorine filling port

The cold wind of the fan coil is not strong, the liquid mirror has liquid refrigerant, and the system pressure is high

Defluorination to normal current

3

Damaged expansion valve

Close the shut-off valve JF4, all closed means full block, half closed means half block

Sight glass with liquid refrigerant, no cold air in fan coil

Fully open globe valve Ⅱ

4

Compressor suction

Port blocked

Close the shut-off valve JF4, all closed means full block, half closed means half block

Fan coils have no cold air, liquid refrigerant in the sight glass, and the compressor sounds dull

Fully open globe valve Ⅰ

5

System cooling side

Pump does not rotate

Turn button K1 off, red light on

The high-pressure side of the system rises, the current increases, and the compressor overload protector is disconnected

Return the button to normal

6

Cooling tower fan

Do not turn

Turn button K2 off, red light on

High pressure on the high side of the system increases current

Return the button to normal

7

Refrigeration water pump

turn

Turn button K3 off, red light on

The fan coil has no cold wind, and the water on the evaporator side freezes.

Return the button to normal

8

Compressor overload

Protector damaged

Turn button K4 off, red light on

Compressor does not start

5 — 8 minutes to return the button to normal

9

Compressor start

Capacitance failure

Compressor does not start, current increases, overload protection is disconnected

**

10

The electromagnetic valve

Keep button K5 off

No cold wind blows out of the fan coil, and the water on the evaporator side freezes

Return the button to normal

11

Indoor side leak

Place the stopper over the nozzle or raise the nozzle

Water in the pan

Remove the plug or restore the height of the outlet pipe

note:

4. All faults should be simulated separately;

5, *: In order to save Freon and prevent pollution, this fault simulation method can be as follows:

Under normal operating conditions, shut off the stop valve JF1 and stop valve JF3 completely, and close the stop valve JF2 completely after running for about half a minute, and open the stop valve JF1 to simulate this fault.

Failure recovery method: After closing the globe valve JF2 and globe valve JF3 for about half a minute, close globe valve JF2 and globe valve JF3 in this order.

6. **: Simulating this fault can easily cause compressor damage. This test bench does not simulate this fault.

(Two) heating failure

Serial number

Fault name

Failure generation method

Failure phenomenon

Troubleshooting

Note

1

Hot water pump does not turn

Place button K7 at

Disabled

Fan coil without

Hot air blows out

Return the button to normal

2

Solenoid valve failure

Place button K5 at

Disabled

Fan coil without

Hot air blows out

Return the button to normal

*

note:

1. All faults should be simulated separately;

2, *: Failure is the same as refrigeration;

3, K1 — K6 failure demonstration operation (ie button off state)

Precautions

1. This test bench uses a single-phase 220V ~ 50Hz power supply, and the allowable voltage fluctuation range is 210-242V. This test bench requires an independent power supply line, and the cross section of the power lead is not less than 4mm 2. Requires reliable grounding of the test bench! !! !!

2. The main part of the refrigeration system in the experimental bench must not be tilted during transportation.

3. All the refrigerants in this experimental bench are R22. It is forbidden to substitute other refrigerants.

4. All circulating water in this experimental platform should be clean and free of pollution. Before each experiment, ensure that there is sufficient circulating water in the system. After the experiment is completed, the water should be drained clean.

5. When adding fluoride to the refrigeration system, the compressor's operating current should be controlled within a deviation range of ± 10% of its rated operating current.

6. When making a failure to the test bench, he should be restored to normal as soon as possible, otherwise, long-term failure operation will easily cause damage to the machine.

7, 0.5 meters behind the test bench.

8. If the return pipe temperature exceeds 15 degrees, refrigerant should be added appropriately.

First, the main configuration:

1. Refrigeration system configuration:

(1), 2P Panasonic Wanbao air-conditioning compressor

(2), 2P evaporation machine

(3), 1 2P condenser

(4), an evaporator cooling water tank

(5), 1 condenser cooling water tank

(6), high and low pressure, differential pressure controller 1

(7), 3/8 refrigerant flow observation mirror

(8), 2 3/8 hand valves

(9), RF22NP5A thermal expansion valve

(10), 3.5MPa high-pressure pressure gauge for seismic refrigerant gauge

(11), 1.5MPa low-pressure pressure gauge for seismic refrigerant meter

(12), 1 1/4 filling hand valve

(13), 2 pieces of transparent oil tank glass for water tank

(14), 900 × 1100mm mainframe unit rack

(15), 3 tons and 1 cooling tower

(16), 25WZ15-0.55 cooling water pump 550W with thermal protection 2

(17), 25WZ12-0.37 cooling water pump 2 with thermal protection 370W

(18), 4 ball valves control cooling and heating

(19), the solenoid valve AC 220V2 only controls the room, whether the air duct sends cold and warm air

(20), 1 thermal expansion valve

(21), 900 width × 900 width × 1000 height mm 1 simulation room

(22), 350 fan coil unit

(23), one third gear of fan coil control switch

(24), 1 set of simulated air duct, inner cut surface is 35 × 34cm

(25), 4 × 6 condenser duct coils

(26), 180W air duct blower

(27), 45W cooling tower fan

(28), 1 fan control switch

Heating system:

1, HP50, 1500W analog boiler

2, 25WZ15-0.55 hot water pump

3.Simulation room, air duct, water tank and refrigeration system

Third, the central air-conditioning system demonstration board

Fourth, a central air-conditioning console

1, 3.5Mpa seismic high pressure refrigerant high pressure meter 1

2. 1.5MPa low pressure seismic refrigerant low-pressure meter

3, 30A main power switch 1

4, AC 220V voltmeter 1

5, 1 DC 30A ammeter

6. 1 set of digital temperature display

7, temperature select lightly switch 12

8. Cooling and heating light switch 4

9, fault display light switch 7

10, 32 status indicators

11. Aluminium-plastic board experiment panel 1

12, 1 set of experimental table, experimental table

13, central air conditioning with a microcomputer interface 1

14. The central air-conditioning control method can be controlled by the test bench or computer.

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