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Enthalpy difference Laboratory

Enthalpy difference Laboratory

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1、 The system structure of enthalpy difference laboratory is as follows

The enthalpy difference chamber meets the requirements of GB / t7725-1996 standard. The air enthalpy difference method is used to test the refrigeration (heat) capacity of air conditioner. The performance of various single -, three-phase window type, split type and unit type air conditioner can be tested. The system is semi-automatic working condition control, automatic stability judgment and record.

Test items

1. Rated refrigeration in steady state;

2. Steady state rated heat pump heating, low temperature heat pump heating, ultra low temperature heat pump heating;

3. Customized heating of electric heating capacity;

4. It can provide environmental conditions for the following type tests:

5. Maximum operating refrigeration and minimum operating refrigeration;

6. Maximum operation heating and minimum operating heating of heat pump;

7. Condensation;

8. Condensate;

9. Freezing;

10. Defrosting;
 

2、 Test conditions

Test standards: national standards GB / T 7725-2004, en14511, en14512, ANSI / AHAM rac-1-2002, iso5151, and Japanese JIS 8615 standard

1. Type of air conditioner tested

Window type, split type, cabinet type, dehumidifier, mobile air conditioner, frequency conversion air conditioner, double speed or double compressor.

2. Allowable load of working condition test

The maximum cooling capacity is 10000w (3P) air-cooled room air conditioner

3. Enthalpy difference test range

Air cooled room air conditioner less than 3 HP

Cooling capacity: 8800 ~ 1200 W

Air volume of indoor unit: 2 ~ 28 m3 / min

Voltage drop between the tested power supply and the voltage drop of the measured power supply is less than 4

1 φ / 3 φ junction box (inside and outside), two 10a and 15A sockets are provided at the same time

  1φ:220V/50Hz、153~252V/50Hz、115V/60 Hz、220 V/60 Hz

  3φ:380V/50Hz、220 V/60 Hz

6. Three phase variable frequency power supply 3 φ 4W 30 KVA, with remote communication interface (provided by the power supply manufacturer when purchasing). )

7. Test accuracy

Compared with the prototype ≤± 2% (target value ± 1%), repeatability ≤± 1%. The test comparison prototype is provided by the user

8. Laboratory conditions

Indoor side temperature 10 ~ 50 ℃, measurement ± 0.1 ℃, control ± 0.2 ℃

Humidity 30 ~ 85% measurement ± 0.1 ℃ (WB) control ± 0.2 ℃ (WB)

Outdoor side temperature - 15 ~ 55 ℃, measurement ± 0.1 ℃, control ± 0.2 ℃

Humidity 30 ~ 85% measurement ± 0.1 ℃ (WB) control ± 0.2 ℃ (WB)
 

3、 System structure of enthalpy difference Laboratory

1. Size

Overall dimension: 10000 (W) × 4500 (d) × 3500 (H)

Indoor side dimension 5500 (W) × 4300 (d) × 3300 (H)

430 (H) × 45000 (H side)

2. Heat preservation and finishing

Rigid polyurethane foam insulation t side indoor

Outdoor side 100 mm t rigid polyurethane foam insulation

Partition wall 100 mm t rigid polyurethane foam insulation

0.6 mm thick color steel plate with fine decoration inside and outside

The floor is made of 100 mm rigid polyurethane foam for thermal insulation and 2.5 mm SUS316 board as a whole

3. Others

Door 1200 × 2000 (H) × 2 (revolving flat door)

700 × 2000h × 1 (revolving flat door)

Top relief valve

Laboratory window size: 400 × 500 × 4;

Indoor side lighting fluorescent lamp 40W 4 groups (explosion proof)

Outdoor side lighting fluorescent lamp 40W 3 groups (explosion proof)

100W low temperature lamp × 2 (explosion proof)

220 V (2 sets of spare sockets)

Through pipe hole 110 Ф × 2 (through partition wall)

4. Opening of middle partition wall

  1000(W)*800(H)

2 temperature and humidity measuring devices

Type automatic water supply type dry wet bulb mode

Forced draft fan 150 W 1 Φ 220 V 50 Hz multi blade fan (explosion proof fan)

6. External insulation structure of laboratory

The function of the external insulation structure of the laboratory is to separate the enthalpy difference laboratory into indoor and outdoor environment rooms, so as to ensure that the laboratory can establish a relatively stable artificial simulation environment which meets the test requirements and is not interfered by the peripheral space in the indoor and outdoor rooms. The heat transfer between the interior space and the external environment, as well as between the indoor side and the outside of the room, can reduce the loss of cold and heat, and reduce the energy consumption of adjusting the ambient temperature, which should have obvious heat preservation and energy saving effect.

7. Air handling unit

Air conditioning system is mainly composed of air conditioning cabinet, fan, heater, humidifier, refrigeration system, etc. Its function is to adjust the indoor air state of enthalpy difference laboratory to meet the working conditions required for testing.

8. Temperature and humidity sampling system

The temperature and humidity sampling system mainly includes: temperature sampler, platinum resistance, sampling fan, temperature transmitter

Temperature control instrument and computer measurement system. Its function is to collect indoor dry and wet bulb temperatures, and outdoor dry and wet bulb temperatures

Wet bulb temperature, outlet air dry temperature and wet bulb temperature are the basic parameters of enthalpy difference method.

9. Air flow measurement device

The air volume measurement device consists of air inlet chamber, nozzle, exhaust chamber, exhaust fan, pressure transmitter, frequency converter and

It consists of pressure control instrument, connecting hose and computer measuring system. Its function is to measure the air flow of the tested unit, which is also the basic parameter of enthalpy difference method.
 

4、 System control system

The measurement and control system provides users with a convenient measurement and control operation platform, which is composed of various measurement and control instruments, transmitters, computers, switches, indicator lights, etc. The main function is to control the operation of enthalpy difference laboratory to ensure the normal operation of the laboratory.
 

Measurement data acquisition system

The measurement data acquisition system is a system to collect the basic parameters measured by enthalpy difference method. It converts the electrical parameters of various sensors into digital quantities, mainly including: power meter, pressure transmitter, temperature sensor, etc.

Design of refrigeration load of refrigeration system in enthalpy difference Laboratory

The cooling system of enthalpy difference laboratory adopts water coil type VAV air conditioning system, which is cooled by water-cooled chiller. Water is used as the carrier refrigerant to heat and wet the VAV air handling unit. Finally, the organic combination, coordinated control and stable operation of the refrigeration system and VAV air treatment system are realized.
This design can meet the requirements of large cooling capacity and temperature regulation in enthalpy difference laboratory. The water-cooled chiller has the function of cooling capacity regulation, and the water pipe system can be adjusted again by adjusting the valve, so as to achieve the purpose of accurate control. It avoids the disadvantages of direct evaporative refrigeration, such as inconvenient load regulation and Limited refrigeration capacity, and simplifies the system control.

 

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400 Tel: 4000-166-872

contact number: 022-22910499

Company fax: 022-22910499

phone number: eighteen billion six hundred and twenty-two million five hundred thousand eight hundred and thirty-seven

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