The Copeland Digital Scroll air-conditioning compressor is an alternative to the inverter compressor. It is a variable refrigerant flow (VRF) air-conditioning system. Copeland Digital Scroll is provided to York’s NetCool air-conditioning system to provide modulated cooling capacity.
During compression one scroll remains stationary (fixed scroll) while the other form is allowed to orbit (orbiting scroll) but not rotate around the first form. As this occurs pockets of refrigerant gas between the two forms are slowly pushed to the centre where the discharge pipe is located. The gases are simultaneously being reduced in volume as this occurs which causes the refrigerant compression and the gas exit at the central port is at high pressure. Because several pockets are compressed simultaneously it is a smooth process. Both suction at outer portion of the scroll members and discharge is continuous.
The Copeland scroll has a unique feature called axial compliance which means that the fixed scroll at the top is allowed to move vertically in a very small amount, for e.g. 1 mm. When it is lifted up by 1 mm there is no compression. This is the unloaded state. When it is pressed back down to the orbiting scroll, compression resumes. This is the loaded state. A solenoid valve is closed during the loaded state (no voltage) and open during the unloaded state (full 220 volts).
In a 20 second cycle if the loaded state is 10 seconds and the unloaded state also 10 seconds the compressor’s output is 50%. If the loaded time is 15 seconds and unloaded time 5 seconds the compressor’s output is 75%. The wide capacity range from 10%–100% results in an unmatched output from the Digital Scroll. This wide capacity output is continuous and seamless and ensures that there is a very tight control on room air temperature. Normal thermostat controlled compressors cannot match this accurate temperature control.
The Copeland scroll has a unique feature called axial compliance which means that the fixed scroll at the top is allowed to move vertically in a very small amount, for e.g. 1 mm. When it is lifted up by 1 mm there is no compression. This is the unloaded state. When it is pressed back down to the orbiting scroll, compression resumes. This is the loaded state. A solenoid valve is closed during the loaded state (no voltage) and open during the unloaded state (full 220 volts).
In a 20 second cycle if the loaded state is 10 seconds and the unloaded state also 10 seconds the compressor’s output is 50%. If the loaded time is 15 seconds and unloaded time 5 seconds the compressor’s output is 75%. The wide capacity range from 10%–100% results in an unmatched output from the Digital Scroll. This wide capacity output is continuous and seamless and ensures that there is a very tight control on room air temperature. Normal thermostat controlled compressors cannot match this accurate temperature control.
Copeland Digital Scroll is used in Delta Shopping Mall, one of the most prestigious shopping malls in Sibu, Sarawak. 275 ceiling cassette type indoor units and 32 outdoor units provide climate control for 100 shoplots with floor areas ranging from 350–5,900 ft2 and one supermarket with floor area of 22,500 ft2. Developers selected York air-conditioning featuring Emerson’s Digital Scroll Technology.
Digital Scroll is also used in Advanced Business Park, Beijing which is China’s largest central air-conditioning project. Powering Samsung’s 13,122 indoor VRF central air-conditioning units and 3,000 outdoor units installed in 1,000 companies, five star hotels and apartments housed in 500 individual buildings within Advanced Business Park, Copeland Digital Scroll is being used for climate control and energy efficient problems.
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