Sir can you make video on what time it takes to cool a freezer to a set temperature like -18 considering fan power nusselt number and all those things .
i learned all this stuff in school but since graduation i ended up specializing in a different field. this channel is a great refresher for building mechanical systems, thanks.
It took me 5hours to learn everything you just explain. Very straight forward. And thank you for adding the calculation for the kW needed to power the unite
The best video that I've ever watched about cooling load calculation. You did an amazing job, man! So clear and straightforward. Thank you so much for that
Hey Paul, Could you do a video on residential load calcs and go more in depth on radiation heating. I'd love to learn more of the math and standards behind doing something similar to a manual J without dedicated software. Thanks for your informative videos!
At the time stamp 5:48 your calculation for walls and roof are off. When you add up the walls and roof you get 118m sq not 113m sq. It is only a difference of .97Wh/d when you figure the equation. Would that small of a difference make any issues arise down the line?
Hi Engineer, avid fan and subscriber here. Can I request for you to cover calculating ventilation rates (cfm), for ERV / Fresh Air Intake units for outdoor air introduction? Thank you
great video, thanks! i have a question. the 20000 apples that are stored in the cold room requires a cooling load too in order to keep the apples cool. how can you calculate that?
Thanks for the explanation of the previous question, but i got an other question about the calculation on the cooling load, is it not reasonable to also calculate cooling load of the air. I was thinking that also heat need to be extracted from the air.
excellent explanation, based on this which of the AC system components contributes most to the thermal capacity of the system, in other words, say we need to upgrade a standard car SUV factory AC , to be able to handle blowing 42 degree F during extended exploration in extreme middle east desert heat in excess of 130 F , what do we upgrade in order of priority and , how do we measure the overall additional capacity?
how can I find the respiration heat of specific fruits, how are you using the values for respiration heat per day and heat of people and stuff, I mean like where are you taking these values from, just want to know that, thanks, very nice video indeed
why we take into account the rated power of the equipment ? Like the power of the fan is the responsible for moving the fan by a specific torque so , i see that the energy (from the power given by time) to move the fan cannot all be converted to a heat load (or heat generation) as the fan would not have the energy to move I believe that there is some of heating in the process but with a ratio please give me an answer as it is so confusing to me I almost forgot, thank you for this great video
Great video, nicely done :) However, the fans' heat load calculation is not correct. You count the 200 W of total electricity consumption as heat. This is true for a heater: 200 W electricity will turn into 200 W heat. That's 100% efficiency, as heating is the purpose of a heater. The electric motor in the fan has an efficiency of ca. 70-80%, so 30-20% of the electricity intake dissipates as heat. Therefore in the formula the 200 W needs to be multiplied by 0.2-0.3, so the 200 W fan will generate only ca. 40-60 W heat.
Medium temperature refrigeration maintaining box temperature of 35 to 38F degrees have evaporator fan motors that run 24hrs per day when set point is satisfied and compressor is off to help defrost evaporator and for air circulation.
Sir can you show us how to calculate to get what compressor and evaporator cooler and its capacity to use after you get the kw/h cooling load. Thank you very much
Does your factor of energy per cubic meter of air (2 kJ m^3 / deg C) account for latent cooling as well as sensible cooling? The value of the heat capacity times temperature difference (sensible cooling) rarely accounts for the full effect of air infiltration. If you want to calculate based on both sensible and latent cooling, a psychrometric chart is the way to go. When I say latent cooling, this is not to be confused with the freezing of the fruits, which I am aware is not present in this calculation. I am referring to the humidity difference between the air outside and the air inside. Basically the refrigeration system will have to condense large amounts of water that enter the unit as the door is opened, which costs energy.
Very helpful. One remark: for "Internal load" - people calculation, it should be 2 people x 4 hours x 270W / 1000. not 270W/h which is a meaningless notion. You have either Watt(power) or Watt x h(energy). Try dimension analysis on your equation: people x hours/day x w/hour = w/d. Which is again, meaningless.
In this example we assumed that 4000 kg of apple changes daily from a total of 20K so 16K still be there untouched. In such case this cold storage should work 24 hours per day but in the end you took 14 hours/day working . Is it just assumed or there is reason which i could not understand
I'm very delighted to meet your youtube channel. Although i got a question that i still think about. I've seen your video about the cold storage calculation: youtu.be/0gv2tJf. You've said that the runtime of the refrigeration unit is set up to 14 hours, but what happens to the temperature of storage food 🍏after the 14 hours. I assume that the temperature is going to drop of the food. So isn't the refidgarator system not 24 hours working?
Brother can you please upload video of cooling load estimation on banana ripening chamber having capacity of 7.5 mt of 3 chamber having 20*12*10 feet chamber each temp is 17-20 deg celcius having water droplet (fog) humidifier 3kg/hr capacity. It is my mtech final year project currently im working on topic PRACTICAL INVESTIGATION AND STUDY OF BANANA RIPENING CHAMBER so it is very useful for me im waiting for ur response.....
⚠️ *Found this video super useful?* Buy Paul a coffee to say thanks: ☕
PayPal: www.paypal.me/TheEngineerinMindset
On Cooling load calculation of office plan please create a video...
hello,
I really want a book speaking about the history of chilling system
Sir can you make video on what time it takes to cool a freezer to a set temperature like -18 considering fan power nusselt number and all those things .
The Engineering Mindset, sir can you plz upload the tables of data that are needed to calculate cooling load..
Can you please upload the data table required for calculating cooling load
This is channel is just the most useful tool to learn HVAC principles I've ever seen. Thank you for sharing knowledge.
i learned all this stuff in school but since graduation i ended up specializing in a different field. this channel is a great refresher for building mechanical systems, thanks.
It took me 5hours to learn everything you just explain. Very straight forward. And thank you for adding the calculation for the kW needed to power the unite
The best video that I've ever watched about cooling load calculation.
You did an amazing job, man! So clear and straightforward. Thank you so much for that
I watch & practice all your clips very closely & I really find it so helpful.
R u an HVAC engineer..?
this is one of the most helpful channels on building services! more uploads please!!!!!
Agree
Very informative video. Hopefully, there will be a version of building load calculation.
will be watching all your videos on cooling loads great break down on the numbers and reasons why we need them to achieve the proper cooling required
Very nice and lucid explanation
Thank you Engineering Mindset for this content! 🙏
Its a fantastic video and very useful details shared so simplified
Thank for the detail provided
Great videos! Very helpful. I hope you could upload more videos specifically on cooling load estimation of a building. thanks
What am excellent explanation Bro
We weren't taught like this on our bachelor's
Hats off bro
Thank you very much for the video
thank you very much, this is very useful with complete information.
bravo , this tutorial video was very informative , thanks
Good job
Great video. Useful practical and beneficial
Hey Paul,
Could you do a video on residential load calcs and go more in depth on radiation heating. I'd love to learn more of the math and standards behind doing something similar to a manual J without dedicated software.
Thanks for your informative videos!
I wonder how much time you would have spent on each of these. This definitely needs over lot of time and effort. Hats Off.
Great videos! Hoping to see more!
great job on these videos and this channel keep it up and thanks you
Great video!! Thankyou so much 😊
Thankyou so much you provide us detailed knowledge❤️❤️❤️
Many thanks for the video. It is really helpful!
Thanks man!
Thank you for this wounderfull information.
Awesome channel.. keep up with the good work
Paul can you also make a video about duct sizing? How to calculate them
Icey Junior already here
Thank you so much! This is such a vital information for me!!!
Loved the video but I believe the area summation for transmission load is incorrect. It should be 118m^2 instead of 113m^2
Thank you 😂 thought I was missing something 😅
At the time stamp 5:48 your calculation for walls and roof are off. When you add up the walls and roof you get 118m sq not 113m sq. It is only a difference of .97Wh/d when you figure the equation. Would that small of a difference make any issues arise down the line?
I saw that same miscalculation it should be 118m sq
Upcoming exam on this topic, hoping to learn something from this video.
Really helpful video, how would one use the cooling load calculation to design the refrigeration system?
thank you it was very helpful
Thanks for your share
Can you do a video on heat load calculation on houses and buildings. Please and thank you
Thanks for the video =)
Pretty cool formula explanation, but I use it shorter Room volume multiply 50watt
please make a video on heating load calculation
Being in Canada we are suppose to use metric system but use imperial because everything we do and use is from the states.
Hi Engineer, avid fan and subscriber here. Can I request for you to cover calculating ventilation rates (cfm), for ERV / Fresh Air Intake units for outdoor air introduction? Thank you
Can you add a fan selection, ducts selection and filter video alongside a project
yes, I'm still waiting for paul to do that it will be helpful in my field
great video, thanks! i have a question. the 20000 apples that are stored in the cold room requires a cooling load too in order to keep the apples cool. how can you calculate that?
Thanks for the explanation of the previous question, but i got an other question about the calculation on the cooling load, is it not reasonable to also calculate cooling load of the air. I was thinking that also heat need to be extracted from the air.
excellent explanation, based on this which of the AC system components contributes most to the thermal capacity of the system, in other words, say we need to upgrade a standard car SUV factory AC , to be able to handle blowing 42 degree F during extended exploration in extreme middle east desert heat in excess of 130 F , what do we upgrade in order of priority and , how do we measure the overall additional capacity?
Please advise the effect of pull down time on total cooling load
Very niece
So beauty
how can I find the respiration heat of specific fruits, how are you using the values for respiration heat per day and heat of people and stuff, I mean like where are you taking these values from, just want to know that, thanks, very nice video indeed
My teacher is using this video to teach us....... quarantine learning
where did the 2 kJ/m^3-C came from in the air infiltration load? 11:28
I’m stuck on this as well
Please explained blocked transkip
why we take into account the rated power of the equipment ?
Like the power of the fan is the responsible for moving the fan by a specific torque
so , i see that the energy (from the power given by time) to move the fan cannot all be converted to a heat load (or heat generation) as the fan would not have the energy to move
I believe that there is some of heating in the process but with a ratio
please give me an answer as it is so confusing to me
I almost forgot, thank you for this great video
Sir .. can u please explain how primary & secondary pumps are connected to chillers..
Already here: ua-cam.com/video/KU_AypZ-BnU/v-deo.html
The Engineering Mindset @ thank q very useful ....
YOU ARE THE BESTTTTT
Great video, nicely done :)
However, the fans' heat load calculation is not correct. You count the 200 W of total electricity consumption as heat. This is true for a heater: 200 W electricity will turn into 200 W heat. That's 100% efficiency, as heating is the purpose of a heater.
The electric motor in the fan has an efficiency of ca. 70-80%, so 30-20% of the electricity intake dissipates as heat. Therefore in the formula the 200 W needs to be multiplied by 0.2-0.3, so the 200 W fan will generate only ca. 40-60 W heat.
Dont forget that movement energy of air taken from fan is also heat. So 200W heat load is no wrong at all
This is in my text but this is gold
Medium temperature refrigeration maintaining box temperature of 35 to 38F degrees have evaporator fan motors that run 24hrs per day when set point is satisfied and compressor is off to help defrost evaporator and for air circulation.
Sir, There is any Heating Load Calculation Lecture ?
How to select tonnage of the AC unit from this final result?
Nice but to convert the meter thing , not here in the USA .
Is it a good idea to install an inverter ac in cold room?
Power inverter video here ua-cam.com/video/iIqhAX0I7lI/v-deo.html
Thermal conductivity of polyurethane foam is 0.028 right or is there any reason behind why you have given it as 0.28.
How you select evaporator fans....its to be find out after calculating cooling load or not?
Sir can you show us how to calculate to get what compressor and evaporator cooler and its capacity to use after you get the kw/h cooling load. Thank you very much
See our refrigeration software videos for a guide. I also made a series for danfoss coolselector 2 software on their channel
@@EngineeringMindset ok. Thank you very much for your immediate response. More power. Your channel is very detailed.
Sir Can I have your email, WhatsApp or messenger no.? We have project for coldroom and we need proper calculations of load capacity.
Sir , I think you forgot to explane CP (specific heat) in the product load section.
What about selection of aveporator and condeser
How do you select a compressor based off the capacity calculated?
So, how to calculation the volume of airflow? Thank u!
Sir what is done in chiller commissioning..
How about plate evaporator freezer for freezing a fish. Fish is in rectangular aluminum tray .. is this formula can apply ? ??
Sometimes on fan they give u rpm which u must multiply too
In transmission load calculation, the temperature is supposed to be in Kelvin right?
Because U value is in W/ m²K
how to calculate thickness of insulation?
Sir what is the specific heat capacity of fresh beef meat? Thank you very much
can you write software name please
Hello, if possible then please help me out with a video of cooling load estimation of a building.
Its coming soon, I will send you a message when ready
@@EngineeringMindset hello! is the video out already? thanks!
Hi Paul, is the video on building heat load calculations coming out?
the Celsius should be converted to Kelvin? to cancel it out.
dear- may i know how to calculate the load for cooling room with full fresh air --the room is 5x6x3 m --regards
What is repiration heat of bacon?
Does this calculation take account for radiation heat transfer load?
How to calculate the u value?
24+24+20+20+30=118 not 113
Sir, in Temp out - Temp in, how can we subtract if Temp out is 33celsius minus to -28celsius? Thank you very much
Just do the subtraction: 33-(-28)=61
The total temperature difference (delta T) is what we need.
Does your factor of energy per cubic meter of air (2 kJ m^3 / deg C) account for latent cooling as well as sensible cooling? The value of the heat capacity times temperature difference (sensible cooling) rarely accounts for the full effect of air infiltration. If you want to calculate based on both sensible and latent cooling, a psychrometric chart is the way to go.
When I say latent cooling, this is not to be confused with the freezing of the fruits, which I am aware is not present in this calculation. I am referring to the humidity difference between the air outside and the air inside. Basically the refrigeration system will have to condense large amounts of water that enter the unit as the door is opened, which costs energy.
Very helpful. One remark: for "Internal load" - people calculation, it should be 2 people x 4 hours x 270W / 1000.
not 270W/h which is a meaningless notion. You have either Watt(power) or Watt x h(energy).
Try dimension analysis on your equation: people x hours/day x w/hour = w/d. Which is again, meaningless.
In this example we assumed that 4000 kg of apple changes daily from a total of 20K so 16K still be there untouched. In such case this cold storage should work 24 hours per day but in the end you took 14 hours/day working . Is it just assumed or there is reason which i could not understand
every heating load is calculated for 24 hrs, but evaporator is assumed to work 14 hrs in a day.
Sir how much we pay if we ask you to calculate the cooling load of big coldroom project?
I don't take on private work but thank you for the consideration. In the video we showed you how to do it for free with the software.
how to calculate heating load
what is heating load?
why did you not talk about time lag?
What's the app name again?
113m2 = 24m2 + 24m2 + 20m2 + 20m2 + 30m2 + 30m2?? 113m2 ❌ 118m2✅
Yep, theres a typo in his calculations
i think area is 118 m2 right?
👌👌👌🤝
I'm very delighted to meet your youtube channel. Although i got a question that i still think about.
I've seen your video about the cold storage calculation: youtu.be/0gv2tJf. You've said that the runtime of the refrigeration unit is set up to 14 hours, but what happens to the temperature of storage food 🍏after the 14 hours. I assume that the temperature is going to drop of the food. So isn't the refidgarator system not 24 hours working?
Why is there a fan in the room...need some answers
To move the air and bring it to the cooling coil
@@EngineeringMindset
Ooohhh...thanks....it was really helpful
Brother can you please upload video of cooling load estimation on banana ripening chamber having capacity of 7.5 mt of 3 chamber having 20*12*10 feet chamber each temp is 17-20 deg celcius having water droplet (fog) humidifier 3kg/hr capacity. It is my mtech final year project currently im working on topic PRACTICAL INVESTIGATION AND STUDY OF BANANA RIPENING CHAMBER so it is very useful for me im waiting for ur response.....
You can just use the free Coolselector software to calculate this. See the links in the video description.