Digital Scroll Compressor vs Variable Speed Compressor
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- čas přidán 7. 08. 2024
- Taken from my presentation called Why DX Systems Fail.
In this video, we discuss the difference between a Copeland Digital Scroll Compressor and a Danfoss Variable Speed Compressor. These two HVAC modulating scroll compressor technologies accomplish similar results but are constructed differently.
Video Description:
The Copeland Scroll Digital offers compressor modulation from 10-100 percent, allowing cooling systems to automatically adjust capacity as needed while reducing energy consumption. This scroll technology allows for precise HVAC system control, is more efficient than on/off compressors, and allows for almost continuous operation during dehumidification modes. Variable capacity control is accomplished by timing the compression by engaging and disengaging the top scroll while motor speed remains constant. Advantages are efficiency, precise control, very low turn down to 10%, and constant velocity refrigerant allowing for effective oil return. For some of the compressor sizes, the "modulating" can produce unwanted noise. Special considerations for location and attenuation are recommended.
Emerson’s Copeland Scroll Variable Speed compressors are designed with AC drive controls that modulate the compressor speed. This compressor speed modulation allows for precise capacity control. Advantages are efficiency, low acoustical characteristics, and precise control. Special considerations are required to ensure oil return which usually prohibits low turndown capabilities. Usually, the minimum allowable turn down is in the 20-40% range.
Thank you for watching and please let me know if you have any questions!
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Hi Tony , could you please share how to do selection for hot gas bypass itself? For example for coolong tunnel application , where we need to control the temperature stable and in other side we need to avoid evaporator freezing..thanks
Great video!
ThankYou
Thank you Smokey!
so, is the variable speed scroll compressor is whats driven in "inverter compressors?" If so, Im curious what would be a reason for a constant high squeal during such compressor operation? (Im trying to figure out why a window AC that uses this tech ... is quiet except for a high pitched squeal around 6.3khz)
Tony, what are your thoughts on using a Rawal valve for capacity control, as opposed to a digital scroll compressor?
Hi Matt thanks for the comment! My understanding of the Rawal valve is that it is very similar to hot gas bypass except uses a mix of liquid and gas. In certain applications it probably does well to prevent compressor short cycling but our typical applications have very wide swings in the building load profile so we require higher turn down and precise controllability offered by digital and variable capacity compressors.
Hello Tony, awesome video! I have one question though and its not very technical as the video is. My question, is it recommended to leave split ac inverter type running 24/7 or do I have to switch it off everytime I leave the house? Because of my understanding if everytime I leave I have to switch it off, it kinda defeat the purpose of the inverter compressor, right? Your input is greatly appreciated!
Hi, it is better to close it off, there is no reason to waste so much energy by cooling an empty house, as for defeating the purpose it is actually not, dont forget that an inverter compressor can go well over the 60Hz meaning that when you will come back home, the compressor will run at maximum speed (maybe higher that 120Hz in some cases) to cooldown the house again and then it will coast at a lower level (15-35Hz usually).
The guy above is somewhat incorrect.
How long are you leaving for? What climate do you live in? If you live in a Hot and Humid climate its much better to leave it running. After all it will only start if the thermostat or whatever controls solution being used calls for it to start, and if you are gone for a long period in excess of a few days the humidity can ruin your home via Mold and rust/corrosion of certain metals. It takes much more energy and time for a system to cool the home from a higher temperature and humidity load vs maintaining it, a system is most efficient near its set point, i.e if its supposed to maintain 75 degrees F, its best to operate it near that temperature. Realistically there is no situation in which you should turn your climate control system off unless the building is being abandoned, or left to sit in a climate where humidity and high heat load is not a factor.
is this possible to run inverter compressor using vfd?
Inverter compressors are driven by them selves through a powerboard, a standard compressor and be ran through VFD.
Hi'
Tony'
Can we use a Digital Scroll compressor in an inverter air conditioner ?
No you cant, you have to choose
The digitals are quite loud....you definitely know when the controller is commanding the unloader over and over
Interesting.
Wich compressor butter hitachi 410 gas OR copland 410 gas ?
Its like comparing a handicap wheelchair with formula 1 car, Copeland is the invertor of scroll technology, it will always be better, they have a huge line-up from A/C to LBP application, digital scroll, VFD scrolls, CO2 Scrolls etc.
A better & Loud voice is desired