Hi Shabbir,
The information sought by you are available in the Post Harvest Books and also on the Engineering Tool Box web site. For further information you may PM to me with what exactly you are looking for.
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Hi Shabbir,
The information sought by you are available in the Post Harvest Books and also on the Engineering Tool Box web site. For further information you may PM to me with what exactly you are looking for.
Are you looking for these attachment.
thankyou samarjit sen for the attachment it willbe very helpful I still need specific heat data of flowers for flower cold storage.Ialso would like to know how to calculate heat load using specific heat letant heat & respiration data.I would like to have calculation formula using all data.
Hello Shabbir,
I presume that you are a refrigeration engineer and as such should be aware of how to calculate the heat load.
I am much elder to you and for your welfare, I would advice you to please study the various books and also go through the forum. Refrigeration line involves a lot of study and we all have come up the hard way and are still learning. Heat load is a very basic thing. I remember there was a post by an Air Conditioning Consultant asking for heat load calculation and how it is to be done. He was also from India. It is sad that we do not go into the basics, but try to know much high. It will not help you. Please take my advice and do a little bit of study and practice. There are lot manymembers in this forum who are of immense help, but first you have to try your self. The forum is meant for this and you will get a lot of help.
Sorry for the lecture, but I just could not help.
Rule of thumb for flowers:
Product BTUH load = 20 x box length(ft) x box width(ft)
This rule is only valid for storage boxes. If the flowers are entering directly from the nursery or field you must calculate the heat of respiration.
I suggest getting hold of an engineering manual from one of the manufacturers such as Heatcraft, Keeprite, Russell etc. Then make copies of their blank load calc forms and practice running loads using their tables and data.
Then, after you have a good understanding of the process to run loads properly using the manual system, switch to a computerized version.
I perform about 1400 load calcs a year average.(sorry about the boasting, just trying to make a point) I recently trained someone to help me and I didn't let him use a computerized program for a year.
Once he did he was very good and was able to catch any mistakes due to incorrect data.
Finally, I always perform and print a load calc on all jobs. Let the customer see this and sign off on the data inputed. This is the way to find mistakes and correct them before the job is installed.
Hi Powel,
I feel bad having to say a lot to people like Shabir. They come to the forum but want that everything should be spoon fed to them. Heat Load is a basic in refrigeration and air conditioning. First you ask for the Sp. Ht. and then you want the heat load calculation. As you know as to how much hard work we had to perform, before we learnt a bit. Why cant these people at least make an attempt and then if they make a mistake, we shall definately help them and with pleasure too.
Hi Shabir,
Please download the following link and study the documents.
http://www.mediafire.com/?cufcj4e07dw
http://www.mediafire.com/?hx01elpzlzj
Any further information required do not hesitate to contact me.
Hi,
For the accurate calc sheet we need to have more info but if you need very fast one , for your case people using volume divided by 15 for the freezer so you well get the HP for the room you need to cool down and 20 for the chiller . and this factors is good for the small rooms but not for the big project.
Hope it well help you
Khalid
Back to old style guys do it manually,no software in doing the load calc,hello?no rule of thumb.
I agree that the best way to calculate the heat load is to do it manually. Even if one uses a software, he should have knowledge to use it and to put in the inputs. I remember that some one in this forum very rightly said, that a softwre is as good as the person who is made it.
My sincere advice to the young engineers is that you have to make your basics strong and to help you in the same there is no other source better than this forum. A lot of studies are required and there is no shortcuts.
I agree with not using rule of thumb.
I am sure that with good software who have all needed inputs and calculations we could much faster and accurately make calculations then manually.
I don't see reason why not use software, except not knowing how to use it. It is tool and results are of such quality as quality and quantity of data have been inputted in to him. Like hammer and piece of sheet metal. The product is good as skill of craftsmen who hits that hammer, quality of hammer and quality of sheet metal.
For serious calculation you can use the web :
heatcraftrpd , and
keepriterefrigeration
For estimate : Use the attach Quick calculations from Heatcraft.
I attach also a very simple and accurate little software.
Good luck
but one must be kind enough to give the formula and all the neccessary detail for consideration so that others can start working from there, remember not all have access to mordern technological developments some have and RE is their only help
One of the best FREE software programs is CoolPack its in English or Danish and is comprehensive for all types of heat load calculations.
Do a internet search you will get to it and the down load does not take very long.
Dear all,
Please provide easy heat load calculation format in excel sheet.
Manish Jha
please provide easy heat load calculation format in excel sheet.
Manish Jha
please reply me how to caculate heat load