1、 The system structure of enthalpy difference laboratory:

The enthalpy difference laboratory, also known as the air conditioning enthalpy difference laboratory, meets the requirements of GB/T7725-1996 standard and uses the air enthalpy difference method to test the cooling (heating) capacity of air conditioners. It can test the performance of various single - and three-phase window type, split type, and unit type air conditioners. The system is equipped with semi-automatic working condition control, automatic stability judgment, and recording.

Test project

1. Stable state rated cooling;

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

3. Customized heating with electric heating capacity;

4. It can also provide environmental conditions for the following types of tests:

5. Maximum operating cooling, minimum operating cooling;

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

7. Condensation;

8. Condensed water;

9. Freeze;

10. Defrost

2、 Test conditions

Testing standards: National standard GB/T 7725-2004 EN14511、EN14512、ANSI/AHAM RAC-1-2002、ISO5151， And refer to the Japanese JIS 8615 standard

1. Type of tested air conditioner

Window type, split type, cabinet type, dehumidifier, mobile air conditioner, variable frequency air conditioner, dual speed or dual compressor.

2. Allowable load for working condition test

Maximum cooling capacity of 10000W (3 horsepower) air-cooled room air conditioner

3. Range of enthalpy difference test

3 horsepower or less air-cooled room air conditioner

Cooling capacity: 1200~8800 W Heating capacity: 1200~9700 W

Indoor unit air volume: 2-28 m3/min

4. Power supply for the tested air conditioner (voltage and frequency can be remotely controlled, and the voltage drop between power supply wiring is less than 2V)

A junction box (inner and outer) that can be used for both 1 and 3 diameters, and provides two 10A and two 1* sockets at the same time

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

3 φ: 380V/50Hz, 220 V/60 Hz

6. Three phase variable frequency power supply 3& phi; 4W 30 KVA, power supply with remote communication interface (provided by the power supply manufacturer at the time of purchase)

7. Testing accuracy

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

8. Laboratory operating conditions

Indoor temperature range of 10-50 ℃, measurement ± 0.1 ℃, control ± 0.2 ℃

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

Outdoor 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

Dimensions 10000 (W) X4500 (D) X3500 (H)

Indoor side dimensions 5500 (W) X4300 (D) X3300 (H)

Outdoor side dimensions 4500 (W) X4300 (D) X3300 (H)

2. Thermal insulation and finishing

Indoor side 100mm t rigid polyurethane foam insulation

100mm t rigid polyurethane foam insulation at outdoor side

100mm t rigid polyurethane foam insulation for partition

Exquisite interior and exterior 0.6mm thick color steel plate

Floor 100mm rigid polyurethane foam insulation, overall foam 2.5mm SUS316 board

3. Other

Door 1200X2000 (h) X2 (rotary flat door)

700X2000HX1 (rotary flat door)

Top pressure relief door

Laboratory window size: 400X500X4;

Four sets of 40W indoor side lighting fluorescent lamps (explosion-proof)

Outdoor side lighting fluorescent lamps 40W, 3 sets (explosion-proof)

100W Low Temperature Lamp X2 (Explosion proof)

Backup socket 220V (1*)~2 sets

Pipe hole for testing machine, through pipe hole 110 ? X2 (through partition wall)

4. Central partition wall opening

1000(W)*800(H)

5. 2 sets of temperature and humidity measuring devices

Type: Automatic water supply type, dry wet bulb method

Supply fan 150W 1 φ 220V 50HZ multi blade fan (explosion-proof fan)

6. Exterior insulation structure of the laboratory

The function of the external insulation structure of the enthalpy difference laboratory is to divide the enthalpy difference test laboratory into relatively independent indoor and outdoor environmental chambers, ensuring that the laboratory can establish a relatively stable artificial simulation environment that meets the testing requirements and is not affected by the external space. The heat transfer between the internal space and the external environment, as well as between the indoor and outdoor sides of the isolation test room, reduces the loss of cold and heat, lowers the energy consumption for regulating the ambient temperature, and has a significant insulation and energy-saving effect.

7. Air handling unit

The air conditioning treatment system mainly consists of air conditioning cabinets, fans, heaters, humidifiers, refrigeration systems, etc. Its function is to regulate the indoor air state of the enthalpy difference test chamber to achieve the required operating conditions for testing.

8. Temperature and humidity sampling system

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

Temperature control instruments and computer measurement systems, etc. Its function is to collect indoor dry and wet bulb temperatures, and outdoor dry and wet bulb temperatures

Wet bulb temperature, air drying and wet bulb temperature, are basic parameters for enthalpy difference method testing.

9. Air flow measurement device

The air volume measuring device consists of an inlet chamber, a nozzle, an exhaust chamber, an exhaust fan, a pressure transmitter, a frequency converter, and a static controller

Composed of pressure control instruments, connecting hoses, and computer measurement systems. Its function is to measure the air flow rate of the test unit, which is also a basic parameter for enthalpy difference method testing  

4、 System control system

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

5、 Measurement data acquisition system

The measurement data acquisition system is a system that collects basic parameters for enthalpy difference method testing, converts the electrical parameters of various sensors into digital quantities, mainly including power meters, pressure transmitters, temperature sensors, etc.

Design of refrigeration load for enthalpy difference laboratory refrigeration system

The refrigeration system of the enthalpy difference laboratory adopts a water coil type variable air volume air conditioning system, which is cooled by a water-cooled chiller unit. Water is used as the refrigerant to perform heat and humidity treatment on the variable air volume air handling unit, ultimately achieving the organic combination, coordinated control, and stable operation of the refrigeration system and the variable air volume air handling systemr unit has a cooling capacity adjustment function, and the water pipeline system can be adjusted again by adjusting the valve, thus achieving precise control. Avoiding the inconvenience of load adjustment and limited cooling capacity caused by direct evaporation refrigeration, while simplifying system control.