PROJECT GOALS AND OBJECTIVES
The workstation is designed for automated measuring the energy efficiency parameters of air conditioning systems in accordance with the requirements of the EN 14511 standards series.
The equipment can be used in the following cases:
- in measuring and certification laboratories and centers;
- during mass production and control of air conditioning systems parameters;
- during the prototypes development of new air conditioning systems.
The Belarusian State Institute for Standardization and Certification got the opportunity to perform air conditioning systems tests on energy efficiency parameters, energy consumption as well as to measure parameters of the thermal and cooling capacity of the said facilities.
PROJECT TECHNICAL DESCRIPTION
The workstation consists of thermostated rooms, which can independently maintain the inside temperature in the range of +10 to +48°C with an accuracy of ± 0.1 C. The chamber has two internal and two external rooms and meet the requirements for thermal leakage through the walls of the test chamber in accordance with the STB EN 14511 standards series.
During testing, the air conditioning system is installed in the inner rooms. The outdoor and indoor units of the air conditioner are installed in different rooms.
The chamber is equipped with a 12 kW power source for a separate supply of the tested air conditioner. The structure of the camera includes measuring equipment that allows measuring the power consumption of the air conditioning systems, consumption in standby and operating modes, the temperature at the outlet of the air conditioner with accuracy better than 0.1%.
The amount of heat capacity of each air conditioning system unit, the amount of condensate from the air conditioning system, the airflow rate at the air conditioner outlet, and other parameters are also measured during the test.
The chamber automatically maintains the specified humidity parameters required for testing. Humidification of air in the chamber is carried out by reheating and mixing of dry air with water from the boiler, sprayed in the chamber through tubes in the air duct system. The circulation of air in the chamber is created by several centrifugal fans. The air flow is directed vertically through the chamber space.
The chamber made of heat-insulating panels, which are joint together and additionally sealed with silicone adhesive. The chamber is equipped with a ventilation and lighting system. The chamber control cabinet is located separately in the operator’s room and connected to a personal computer via Ethernet.
The chamber is powered by 400V 50 Hz three-phase network. The power consumption of the chamber is not more than 250 kVA.
The chamber is equipped with sliding double-leaf doors with dimensions of 2100x1900mm (the door dimensions may be different at the customer request).
Fully automated workstation allows automatically measure all energy efficiency parameters of air conditioning systems and generate reports and protocols in accordance with the chosen measurement program.
The software is written on LabView and has many convenient functions for controlling, monitoring and analyzing the equipment under test.
OPERATING PRINCIPLE
The air conditioner under test is placed in the chamber and all necessary connections are made. Afterwards, the camera turns on and reaches the set thermal conditions.
The measurement stage begins when the stable environmental conditions are reached and the required test equipment operation mode is established. In accordance with the applicable standard, specialized software collects and analyzes the electrical parameters and temperature during entire test period. Test report can be saved and printed.
After a series of tests performed on one device, the software generates a final report with indication of the model of the device under test or the test sequence number and information about the operator and test conditions. The environmental conditions created in the chamber meet the requirements of the various test procedures given in the standards indicated in the table below.
SYSTEM SPECIFICATIONS
| Measuring chamber | |
|---|---|
| PARAMETER | VALUE |
| Range of humidity control | 40-90% |
| Operating temperature range of internal chambers | +10 ÷ + 38 ° C |
| Operating temperature range of external chambers | -22 ÷ + 60 ° C |
| Temperature measurement accuracy | ± 0,1 K |
| External chamber dimensions | 10.0 m (L) x 4.5 m (W) x 3.2 m (H) |
| Internal test rooms dimensions | 5.5 m (L) x 4.5 m (W) x 3.2 m (H) |
| Thermal power of tested air conditioners | 2 ~ 12 kW |
| Operating mode | round-the-clock |
| Power analyzer | |
| PARAMETER | VALUE |
| Voltage measurement range | 0 ÷ 1000 V |
| Voltage measurement accuracy | ± 0,5 % of FS |
| Current range | 0 ÷ 30 A |
| Current measurement accuracy | ± 0,5 % of FS |
| Power measurement frequency range | 0,5 Hz ÷ 100 kHz |
| Power factor measurement range | 0,00 ÷ 1 |
| Phase measurement range | -180 ° ÷ + 180 ° |
| Active power measurement range | 0 ÷ 12 kW |
| Active power measurement accuracy | ± 0,5% |
| Reactive power measurement range | 0 ÷ 12 kVA |
| Power supplies | |
| PARAMETER | VALUE |
| Adjustable AC output voltage | 0 ÷ 300 V |
| Output frequency | 47 ÷ 63 Hz |
| Output power | 0 ÷ 12 kW |
| Output voltage accuracy | ± 1% |
| THD (total harmonic distortion) | < 2 % |
| Interface | RS-232/USB and software |
| WORKSTATION STRUCTURE | |
| Measuring thermostatic chamber | |
| Power sources, 2 pcs. | |
| Power analyzer Yokogawa WT330 | |
| Multichannel temperature and humidity measurement system | |
| Digital thermohygrometer | |
| Anemometer | |
| Stopwatch | |
| Measuring equipment for determining overall dimensions of the equipment under test (calipers, rulers, roulettes) | |
| Personal computer, printer | |
| Desk, operator’s chair | |
| RELATED STANDARDS | |
| СТБ EN 14511-1-2016 | Air conditioners, liquid chilling packages and heat pumps with electrically driven compressors for space heating and cooling. Part 1 |
| СТБ EN 14511-2-2009 | Air conditioners, liquid chilling packages and heat pumps with electrically driven compressors for space heating and cooling – Part 2: Test conditions |
| СТБ EN 14511-3-2009 | Air conditioners, liquid cooling units and heat pumps with electric compressors for heating and cooling of the premises – Part 3: Test methods |
| СТБ EN 14511-4-2009 | Air conditioners, liquid chilling packages and heat pumps with electrically driven compressors for space heating and cooling – Part 4: Test requirements |
| BS EN 14511-1:2013 | Air conditioners, liquid chilling packages and heat pumps with electrically driven compressors for space heating and cooling. Terms, definitions and classification |
| BS EN 14511-2:2011 | Air conditioners, liquid chilling packages and heat pumps with electrically driven compressors for space heating and cooling. Test conditions. |
| BS EN 14511-3:2013 | Air conditioners, liquid chilling packages and heat pumps with electrically driven compressors for space heating and cooling. Test methods |
| BS EN 14511-4:2013 | Air conditioners, liquid chilling packages and heat pumps with electrically driven compressors for space heating and cooling. Operating requirements, marking and instructions |
| ANSI/ASHRAE Standard 37-2009 | Methods of Testing for Rating Electrically Driven Unitary Air-Conditioning and Heat Pump Equipment |
| AHRI 210/240 | Performance rating of unitary air-conditioning & air-source heat pump equipment |
| ANSI/ASHRAE 41.2 | Standard Methods for Laboratory Airflow Measurement |
| ISO 5151 | Non-ducted air conditioners and heat pumps – Testing and rating for performance |
| GB/T 7725-2004 | Room air conditioner |
| IEC 60335-2-40 | Household and similar electrical appliances – Safety – Part 2-40 Particular requirements for electrical heat pumps, air conditioners and dehumidifiers |
| ASHRAE 41.1-1986 (RA2006) | Standard method for Temperature Measurement |
| ASHRAE 51 -07 |
Laboratory Methods of Testing ans for Certified Aerodynamic Performance Rating |
| ASHRAE 41.3-1998 | Methods for Pressure Measurements |
| ASHRAE 41.6-1994 (RA2001) | Standard Method for Measurement of Moist Air Properties |
