How Heat Pumps Work - ADVANCED (design data)
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Date: 2023-11-17
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Comments and reviews: 11
LuciStar
I know this is six years old but it's slightly confusing that you have the colors going from orange as hottest to red being medium heat. Second thing; I was hoping at some point in your explanation of heat exchangers to explain how the ideal gas law can help explain how the compressor increases the temperature by increasing the pressure and the expansion valve decreases the temperature by decreasing the pressure. It's pretty confusing at first to understand why the refrigerant comes out of the compressor so hot or why the refrigerant is so cool when it enters the evaporator. It's also confusing without explaining the effects of pressure as to how you take a refrigerant with -30 boiling point and condense it in 70 degree weather. If your going to throw concepts like entropy and enthalpy around you might as well.
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I know this is six years old but it's slightly confusing that you have the colors going from orange as hottest to red being medium heat. Second thing; I was hoping at some point in your explanation of heat exchangers to explain how the ideal gas law can help explain how the compressor increases the temperature by increasing the pressure and the expansion valve decreases the temperature by decreasing the pressure. It's pretty confusing at first to understand why the refrigerant comes out of the compressor so hot or why the refrigerant is so cool when it enters the evaporator. It's also confusing without explaining the effects of pressure as to how you take a refrigerant with -30 boiling point and condense it in 70 degree weather. If your going to throw concepts like entropy and enthalpy around you might as well.
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AL
Thank you for your great videos explaining heat pumps. I live in Canada and we get both high +30s (C) and low temps -50c. I am no eng but have a pipping background. I am wondering what if any, the advantage to having the boiling point that is limited to -30 in a system. Is it the cost over the -50 alternative? Or the safety of using one or the other? Also, are the gases for compression higher or lower system pressures? Thank you for your time and great videos AL
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Thank you for your great videos explaining heat pumps. I live in Canada and we get both high +30s (C) and low temps -50c. I am no eng but have a pipping background. I am wondering what if any, the advantage to having the boiling point that is limited to -30 in a system. Is it the cost over the -50 alternative? Or the safety of using one or the other? Also, are the gases for compression higher or lower system pressures? Thank you for your time and great videos AL
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Tan
Excellent video. Very informative. Two suggestions - First, it'd be great if you may expand this video a bit and explain how you get the data from the real world for the four status points. For example, you get the pressure values for point 1 and point 2 from your compressor performance curve; Second, add some explanation of superheating and subcooling and how they are reflected in your system design.
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Excellent video. Very informative. Two suggestions - First, it'd be great if you may expand this video a bit and explain how you get the data from the real world for the four status points. For example, you get the pressure values for point 1 and point 2 from your compressor performance curve; Second, add some explanation of superheating and subcooling and how they are reflected in your system design.
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Chanpreet
Fantastic video and helps a lot.
Need your help in understanding air temperature changes when passing through Evaporator and condenser. Can you tell me when heat pump works in heating mode and ambient temperature is -30C, what would the refrigerant temperature have to be at outdoor unit so that heat exchange really happens? I guess -45 or -50C.
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Fantastic video and helps a lot.
Need your help in understanding air temperature changes when passing through Evaporator and condenser. Can you tell me when heat pump works in heating mode and ambient temperature is -30C, what would the refrigerant temperature have to be at outdoor unit so that heat exchange really happens? I guess -45 or -50C.
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SRB
Nice introductory video. Just a few questions - since you considered the delta P across the heat exchangers, for the sake of consistency wouldn't it be appropriate to consider the efficiency of the compressor - the process is shown as isentropic. Also, it would be nice to know the assumed air side temperatures of the heat exchangers.
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Nice introductory video. Just a few questions - since you considered the delta P across the heat exchangers, for the sake of consistency wouldn't it be appropriate to consider the efficiency of the compressor - the process is shown as isentropic. Also, it would be nice to know the assumed air side temperatures of the heat exchangers.
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Brett
Wonder what the outdoor coil TD in heating mode would typically be? Heat pumps usually design OAT of 25F in heating. Some as low a -40F/-40C. Would you want a low TD for low humidity removal for less less chance of OD coil freeze ups?
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Wonder what the outdoor coil TD in heating mode would typically be? Heat pumps usually design OAT of 25F in heating. Some as low a -40F/-40C. Would you want a low TD for low humidity removal for less less chance of OD coil freeze ups?
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Jordan
Awesome videos, thank you for the concise explanations! I am a student taking HVAC&R at a local trades school and these videos are a fantastic reference of many systems they cover in the curriculum. Cheers!
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Awesome videos, thank you for the concise explanations! I am a student taking HVAC&R at a local trades school and these videos are a fantastic reference of many systems they cover in the curriculum. Cheers!
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Stephen
Since Heat pumps are fairly simple systems- what makes certain heat pumps so much more efficient than the lower efficient ones - refridgerant type. Presuming say air source heat pumps?
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Since Heat pumps are fairly simple systems- what makes certain heat pumps so much more efficient than the lower efficient ones - refridgerant type. Presuming say air source heat pumps?
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al
If you have York Cold Room PID Diagram Please Explain in Wiring Diagram and working details. it will helps us andunderstating cold room operation. Plz
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If you have York Cold Room PID Diagram Please Explain in Wiring Diagram and working details. it will helps us andunderstating cold room operation. Plz
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Space
Very professional explanation. Tell please about supeheat and subcooling. A lot of people dont understand how it works. Thank you.
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Very professional explanation. Tell please about supeheat and subcooling. A lot of people dont understand how it works. Thank you.
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Stephen
Excellent graphics and explanation. thank you. Is it correct to say the a lot of the magic happens in the refrigerant?
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Excellent graphics and explanation. thank you. Is it correct to say the a lot of the magic happens in the refrigerant?
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