Interesting. It seems like this is the opposite to most mini split units, yes? You can have a couple indoor units, and you might not need all of them operating. Does a variable speed compressor fix that problem / mismatch?
Hi Gopi. Generally mini splits use a variable speed compressor so they are designed to operate one or more indoor units. The same logic can be used for Refrigeration systems, the Danfoss Optyma Inverter unit is an example of this. You can check it out here: store.danfoss.com/en/Climate-Solutions-for-cooling/Condensing-units/Optyma%E2%84%A2-Plus-INVERTER/Optyma%E2%84%A2-Plus-INVERTER%2C-OP-MPPM028VVLP01E/p/114X4302 Hope this answered your question!
i'd asked some hvac ppl and they all told me it wont work and it absolutely has to be matched exactly. i never knew why, and still dont. isnt the cold produced when the refrigerant turns to liquid and is cooled to outside temps and when decompressed it creates cold which is then warmed up by the inside temps and repeats. the point at which the refrigerant turns liquid is based on pressure at a given temperature, right? so wouldnt you want a compressor that pumps to the pressure that it turns liquid and the eev maintains that pressure by adjusting flow. unless my understanding is wrong, but that would mean that you can have any size mismatch and as long as you are able to have enough refrigerant that under working condition the low side stays over 20-30 psi and you are cooling it back down sufficiently and that the cold side loses its cold before returning to the compressor.
Hi Jason. The simple answer would be that yes if you connect any compressor, condenser, expansion valve and evaporator and charge with refrigerant you will get refrigeration of some description. However, to achieve the correct evaporating temperature for the product being refrigerated then the duty between all 4 major components (compressor, condenser, expansion device and evaporator) must be correct. We hope this explains it!
Hi. If you cannot see the naming plate you can only estimate the capacity. If the evaporator is still installed, you might know the capacity of the condensing unit, which should fit to the evaporator capacity. If you only have the evaporator, the dimensions could give an idea about the capacity. You could compare it with similar evaporators in catalogs. We hope this is helpful.
Hey, im looking for an answer but i could but u helped me ❤️ Now, as u said a smaller compressor in a larger circuit. Now i have a 2.25 hp ac with a broken compressor, if i replace this comp. With smaller one like 3/4 hp it will works fine ? Or what ?
Hello, you will need to replace the compressor with an equal size duty and one that is approved for use with the refrigerant being used, otherwise the system will not operate correctly. If you installed a much small compressor as a replacement the evaporating temperature would increase meaning the refrigeration system would not be as cold as the design temperature. Hope this helps!
Hi again Toyin, The easiest method is to use a head pressure control device such as the Danfoss Saginomiya XGE. It regulates the fan speed depending on the head pressure. Please, see the following literature: assets.danfoss.com/documents/162734/AI227986440745en-000201.pdf. Hope this was helpful :-)
Hi again Nelum, If the evaporator has a larger capacity than the condensing unit, the suction temperature / pressure will increase. If the condensing unit has a larger capacity than the evaporator, the suction temperature / pressure will decrease. Hope this was helpful. Please, let us know if you need any further details/information :-)
lol what??? higher suction pressure = higher amps pulled by the compressor, if anything you want a lower suction pressure to increase efficency of the compressor. then again, nothing beats power savings more then having a properly sized system, too large of a compressor with low suction wont same you on energy, and to small of a compressor with high suction pressure wont save you on energy costs either. having a balanced system is always the best option. Now, lets talk about a perfectly balanced system, what can we do to increase efficeny? Well, we can reduce the line set length as much as possible.. We can also use an oil seperator to increase the capacity of the evaporator slightly. We can use an EEV to increase efficency even more. But the best option is having a remote condenser outside and the compressor right next to and below the evaporator.
Hi. We agree that the best system is one that is correctly sized and balanced between compressor and evaporator capacity to match the system requirements and the components specification.
@@DanfossClimate what about inverter systems if we cant able to decrease evaporator capacity. For example in data center applications how can ı manage condenser and evap. Pressures at low inverter frequency (evap fans always %100) thank you. I am working for bachelor degree thesis 🙏
@@halilcankaya3202 When you have a variable speed compressor, this will speed up and slow down depending on suction pressure to main a stable saturated suction temperature. it is always advisable to use variable speed condenser fans to keep a stable condensing pressure based on ambient temperature and the temperature difference between condensing pressure and ambient. In general evaporator fans run at a fixed speed to maintain temperature difference across the evaporator and because data centers require high volumes of cold air to maintain the required temperature. If you have too many variables in a control method it is very difficult to get stable system.
@@DanfossClimate thank you for informations. I maked selection with help of Coolselector and heatexchanger selection softwares for my thesis ı repeat them from different scenarios. But ı think experimental study is very essantial for this type of application. Thank you again 🙏
Nice explanation ! Thank you so much.
You're welcome. Happy to hear it's useful. Stay tuned for more videos :-)
Interesting. It seems like this is the opposite to most mini split units, yes? You can have a couple indoor units, and you might not need all of them operating.
Does a variable speed compressor fix that problem / mismatch?
Hi, we are checking with our experts and will get back to you.
Hi Gopi. Generally mini splits use a variable speed compressor so they are designed to operate one or more indoor units. The same logic can be used for Refrigeration systems, the Danfoss Optyma Inverter unit is an example of this. You can check it out here: store.danfoss.com/en/Climate-Solutions-for-cooling/Condensing-units/Optyma%E2%84%A2-Plus-INVERTER/Optyma%E2%84%A2-Plus-INVERTER%2C-OP-MPPM028VVLP01E/p/114X4302 Hope this answered your question!
Thank you
You're welcome :-) Hope this was useful.
Sir what is the difference between vapour ejection and liquid ejection compressor?
Great way to explain
Thank you ❤❤❤
i'd asked some hvac ppl and they all told me it wont work and it absolutely has to be matched exactly. i never knew why, and still dont. isnt the cold produced when the refrigerant turns to liquid and is cooled to outside temps and when decompressed it creates cold which is then warmed up by the inside temps and repeats.
the point at which the refrigerant turns liquid is based on pressure at a given temperature, right? so wouldnt you want a compressor that pumps to the pressure that it turns liquid and the eev maintains that pressure by adjusting flow. unless my understanding is wrong, but that would mean that you can have any size mismatch and as long as you are able to have enough refrigerant that under working condition the low side stays over 20-30 psi and you are cooling it back down sufficiently and that the cold side loses its cold before returning to the compressor.
Thanks for your question. We are checking with our experts and will get back to you.
Hi Jason. The simple answer would be that yes if you connect any compressor, condenser, expansion valve and evaporator and charge with refrigerant you will get refrigeration of some description. However, to achieve the correct evaporating temperature for the product being refrigerated then the duty between all 4 major components (compressor, condenser, expansion device and evaporator) must be correct. We hope this explains it!
HELLO everyone
So how does the sunlight get to the bottom of the mariona trench & move the tectonic plates??? GOOD GRIEF
I know right.
How to know /tell the capacity of a coil by without seeing naming plate? Is there any calculation for that ?
Thanks for your question. We will check with our experts and get back to you.
Hi. If you cannot see the naming plate you can only estimate the capacity. If the evaporator is still installed, you might know the capacity of the condensing unit, which should fit to the evaporator capacity. If you only have the evaporator, the dimensions could give an idea about the capacity. You could compare it with similar evaporators in catalogs. We hope this is helpful.
Hey, im looking for an answer but i could but u helped me ❤️
Now, as u said a smaller compressor in a larger circuit.
Now i have a 2.25 hp ac with a broken compressor, if i replace this comp. With smaller one like 3/4 hp it will works fine ? Or what ?
Hi, we are checking with our experts and will get back to you.
Hello, you will need to replace the compressor with an equal size duty and one that is approved for use with the refrigerant being used, otherwise the system will not operate correctly. If you installed a much small compressor as a replacement the evaporating temperature would increase meaning the refrigeration system would not be as cold as the design temperature. Hope this helps!
Sir, if reduce the condensor size by reducing number of rows of HE in ODU , how it will affect the evaporator temperature.
Hi, we are checking with our experts and will get back to you.
Lower condenser capacity may cause higher condensing temperature which will lead to high evaporator temperature
Thanks Always John😊... I see you're a fan of Star Wars 😏👍
:-)
How can I modulate the compressor head pressure to achieve low condensing temperature with the change in ambient Temperature?
Hi Toyin, Thank you for your question. Let us get back to you about this one :-)
Hi again Toyin,
The easiest method is to use a head pressure control device such as the Danfoss Saginomiya XGE. It regulates the fan speed depending on the head pressure. Please, see the following literature: assets.danfoss.com/documents/162734/AI227986440745en-000201.pdf.
Hope this was helpful :-)
And put the condenser in some good shade
What happens if the evaporating unit has a larger capacity than the condenser and vice versa??
Hi Nelum, Thank you for your comment. Let us get back to you about this one as soon as possible :-)
@@DanfossClimate thank you sir.🙂
Hi again Nelum,
If the evaporator has a larger capacity than the condensing unit, the suction temperature / pressure will increase.
If the condensing unit has a larger capacity than the evaporator, the suction temperature / pressure will decrease.
Hope this was helpful. Please, let us know if you need any further details/information :-)
@@DanfossClimate I have a condensing unit that has a larger capacity than my evaporator and low suction pressure. How does one remedy this problem?
@@jonathanketty2578 We are checking with our team and will get back to you!
lol what??? higher suction pressure = higher amps pulled by the compressor, if anything you want a lower suction pressure to increase efficency of the compressor. then again, nothing beats power savings more then having a properly sized system, too large of a compressor with low suction wont same you on energy, and to small of a compressor with high suction pressure wont save you on energy costs either. having a balanced system is always the best option.
Now, lets talk about a perfectly balanced system, what can we do to increase efficeny? Well, we can reduce the line set length as much as possible.. We can also use an oil seperator to increase the capacity of the evaporator slightly. We can use an EEV to increase efficency even more. But the best option is having a remote condenser outside and the compressor right next to and below the evaporator.
Hi. We agree that the best system is one that is correctly sized and balanced between compressor and evaporator capacity to match the system requirements and the components specification.
@@DanfossClimate what about inverter systems if we cant able to decrease evaporator capacity. For example in data center applications how can ı manage condenser and evap. Pressures at low inverter frequency (evap fans always %100) thank you. I am working for bachelor degree thesis 🙏
@@halilcankaya3202 When you have a variable speed compressor, this will speed up and slow down depending on suction pressure to main a stable saturated suction temperature. it is always advisable to use variable speed condenser fans to keep a stable condensing pressure based on ambient temperature and the temperature difference between condensing pressure and ambient. In general evaporator fans run at a fixed speed to maintain temperature difference across the evaporator and because data centers require high volumes of cold air to maintain the required temperature. If you have too many variables in a control method it is very difficult to get stable system.
@@DanfossClimate thank you for informations. I maked selection with help of Coolselector and heatexchanger selection softwares for my thesis ı repeat them from different scenarios. But ı think experimental study is very essantial for this type of application. Thank you again 🙏
Probably nothing. I had a service a 17 year old unit. Original builder system connected the wrong units in the attic 4 ton onto 2 ton vise versa. 😂