Chamber appearance - view from the entrance door side

Calorimetric room for measuring the energy efficiency of household refrigerating appliances Theseus Lab

Project title

Workstation for measuring energy efficiency of refrigerating appliances.

Project execution time

Project start: 11/11/2014, Project completion date: 08/11/2016

Customer

Belarusian State Institute for Standardization and Certification

PROJECT GOALS
AND OBJECTIVES

The workstation is designed for automated measurements of energy efficiency parameters of refrigerating appliances in accordance with the requirements of the IEC 62552.

The appliances can be used in the following cases:

  • in measuring and certification laboratories and centers;
  • during mass production and control of refrigerating appliances parameters;
  • during the prototypes development of new refrigerating appliances.

The Belarusian State Institute for Standardization and Certification got the opportunity to perform tests of refrigerating appliances 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 a thermostated chamber, which can maintain the inside temperature in the range of +10 to + 43°C with an accuracy of ± 0.5°C. The chamber has six test sites for refrigerating appliances, which allows simultaneous measurements of up to 6 units.

The chamber is equipped with six independent 4kW power sources to provide separate supply for each refrigeration unit. Measuring equipment of the chamber allows to measure power consumption of refrigerators, defrost/freeze period, consumption in standby mode, temperature inside refrigeration units at several points with an accuracy better than 0.1%. 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. Air circulation in the chamber is created by two centrifugal fans. 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. Control cabinet of the chamber 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 100 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 refrigerating appliances and generate reports and protocols in accordance with the chosen measurement program.

The software is written on LabView and has many convenient functions for control, monitoring and analyzing the equipment under test.

OPERATING
PRINCIPLE

The refrigerator and freezer are placed in the test chamber after reaching predetermined operation mode, and stable environmental conditions inside the chamber. Specialized software analyzes the electrical parameters and temperature during the entire test period, in accordance with the applicable standard. 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. Environmental conditions created in the chamber meet the requirements of the various test procedures given in the standard.

The operating principle of the system is shown on the following figure.

System control structure

System control structure

SYSTEM
SPECIFICATIONS
Measuring chamber
PARAMETER VALUE
Range of humidity control 40-90%
Operating temperature range +10 ÷ + 43°C
Temperature measurement accuracy ± 0,1 К
Chamber area 30 m2
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 ÷ 5 kW
Active power measurement accuracy ± 1%
Reactive power measurement range 0 ÷ 5 kVA
Power supplies
PARAMETER VALUE
Adjustable AC output voltage 0 ÷ 300 V
Output frequency 47 ÷ 63 Hz
Output power 0 ÷ 4 kW
Output voltage accuracy ± 1%
THD (total harmonic distortion) less 2 %
Interface RS-232/USB and software
Test packs*
Test packs type 1000 (-1°C). Size: 200x100x50 mm. Weight: 1 kg.
Test packs type 5000 (-1°C). Size: 100x100x50 mm. Weight: 0,5 kg.
Test packs type 5100 (-1°C). Size: 200x100x25 mm. Weight: 0,5 kg.
Test packs type 1250 (-1°C). Size: 100x50x25 mm. Weight: 0,125 kg.
Test packs “M” type 500X (-1°C). Size:  100x100x50 mm. Weight: 0,5 kg.

* Note: Our Company can produce customized test packs of any other sizes.

WORKSTATION
STRUCTURE
DESCRIPTION
Measuring thermostatic chamber
Power sources AFC-11015, 6pcs.
Power analyzers, 6pcs.
Multichannel temperature and humidity measurement system (more than 100 channels)
Digital thermohygrometer
Anemometer
Stopwatch
Measuring equipment for determining overall dimensions of the equipment under test (calipers, rulers, roulettes)
Test packs (more than 900 pieces)
Personal computer, printer
Desk, operator’s chair
STANDARDS RELATING
TO THE WORKSTATION
SHORT DESIGNATION FULL TITLE
ISO 15502 Household refrigerating appliances – characteristics and test method.
IEC 62552 Household refrigerating appliances – characteristics and test method.
CEN EN 153 Methods of measuring the energy consumption of electrical mains operated household refrigerators, frozen food storage cabinets, food freezers and their combinations, together with associated characteristics

WE ARE OPEN TO CONTACT AND ALWAYS READY TO UPGRADE OUR HARDWARE AND SOFTWARE AT THE CUSTOMER’S REQUEST

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