Water Chiller HVAC
Test ability, technical level
1.GRAD has the National Laboratory of Air Conditioning Products recognized by CNAS, which is used for the design, development and experimental research of water-cooled chiller and the factory test of products.
2.Strict factory product quality control, so that users can buy at ease, with satisfaction.
3.GRAD screw type water cooled chiller series products ware tested by the national air conditioning quality testing center, the technical performance indicators are higher than GB/T184330.1-2007"Vapor compression cycle cold water (heat pump) unit Part 1: Industrial or commercial and similar uses of cold water (heat pump) units "standard, product quality is stable, reliable operation, has been praised by the majority of users at home and abroad.
The water-cooled screw chiller adopts the semi-closed double-screw compressor, and uses the single circuit or multi-circuit design. The protection and control facilities are placed in the control cabinet and the running state of the host is displayed on the computer monitor. All units are assembled in the factory and leave the factory after being operated and debugged. The application scope of this series of the units includes various commercial and civilian building facilities, such as shopping malls, office buildings,
commercial buildings, factory workshops, hotels, hospitals and so on.
※High efficiency compressor
The unit adopts wellknown brand semi-closed screw compressor. Compared with piston compressor, semi-closed screw compressor has the following advantages:
(1)Fewer parts (about 1 /3 of the piston compressor), simple structure, less wearing parts, high reliability, long life
(2) The compressor: uniform and continuous suction and exhaust, low exhaust temperature, small vibration, insensitive to wet compression, and strong resistance to liquid shock;
(3) COP of dry unit can reach more than 4.6, COP of full liquid/falling film unit can reach more than5.3
(4) In terms of energy regulation, screw compressors have more advantages, achieving 25-100% stepless energy regulation.
※Ultra-efficient falling film evaporator
(1) Single circuit or double circuit refrigerant system design: the refrigerant evaporates in the shell side, and the cold water flows through the pipe to be cooled. All heat exchange tubes are infiltrated in the refrigerant, Effectively increase the heat transfer efficiency, improve the evaporation temperature.
(2) Shell: The production and test are in accordance with the provisions of NB/T47012-2020"Pressure vessel for refrigeration equipment" standard.
(3) Copper pipe: seamless copper pipe for full liquid unit using the most advanced internal and external fin strengthening technology in China.
(4)Effectively control the liquid level with the electronic expansion valve. Make the unit to achieve the best operating state.
(5) Compared with the full liquid evaporator, the falling film evaporator reduces the amount of refrigerant charge, improves the of about 10%, of the heat exchange efficiency, and makes the oil return more stable and the operation more reliable.
※Due to the efficiency and stability of the falling film chiller, it can completely replace the full liquid chiller, and the falling film chiller has the following advantages:
(1) The use of high efficiency falling film evaporator, its heat transfer efficiency increased by more than 15% than the traditional full liquid evaporator , the unit operating costs saving 30%. The application in the unit can make the unit performance coefficient up to the national energy-saving certification level one. At the same time, the falling film evaporator successfully obtained the national utility model patent.
(2) Using the national invention patent "refrigerant flow real-time control", real-time flow control according to the change of user load, more accurate control precision, more reliable unit operation; At the same time, the level
control of the unit is more stable, so that the required deviation of the unit to the basic levelness is within10%, which is a leading position in the same industry.
The use of independent research and development has successfully obtained the national utility model patent of ultra-high efficiency and low resistance oil separator, oil separation efficiency of up to 99.99%, the unit oil return more reliable, longer service life of the unit.
(3) Adopt the first domestic liquid distribution technology and the condenser refrigerant export structure with national utility model patent technology, reduce the refrigerant charge amount, reduce the utilization rate of refrigerant, and the unit is more environmentally friendly.
(4)Intelligent remote monitoring technology is used to realize monitoring functions such as "unit alarm message reminder", "unit fault remote processing", and "unit operation data memory". Let the user use more assured, unit operation more efficient.
Application scope
Comfort air conditioning systems: large supermarkets or commercial complexes, hotels, shopping malls, office buildings, exhibition halls, airports, stadiums, etc.
Process air conditioning systems: electronics, biology, light textile, chemical engineering, metallurgy, pharmaceuticals, power, machinery, etc.
About us
Establised in 1993, GRAD Group covers an area of 1.15 million square meters and has more than 2,000 employees, with an annual output value of nearly 4 billion yuan. GRAD Group's main business: central air conditioning chiller and terminal products, FRP water tank, FRP winding pipe, FRP storage tank, wind turbine cabin cover, environmental protection equipment, and other more than 130 varieties. GRAD Group is the pillar enterprise of the “Dezhou Central Air-Conditioning City” named by the China Refrigeration and Air-Conditioning Industry Association. It ranks the top 10 among central air-conditioning enterprises in the country, and gets the first-class qualification for the installation of national electromechanical equipment and the second-class qualification for air purification engineering. GRAD Group can undertake central air conditioning engineering, purification engineering construction.
GRAD sales network covers over 100 countries and regions like America, Australia Indonesia, Malaysia, UAE, Thailand, Nigeria etc and has established branch company in USA, and set up offices in Cambodia and Thailand to make overall layout of global market.
