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For water heater, how could we calculate the heat required for a certain water consumption ?

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Question ajoutée par Sherif Mohammed Ibrahim , Senior Mechanical Technical engineer , Al-Latifia Trading & Contracting Company
Date de publication: 2015/06/29
Salman Sarang
par Salman Sarang , Design Manager - Mechanical Engineering , Cenomi Centers

For a central heating source, firstly estimate the demand for the entire facility/building in gph (US Gallons per hour). Next based on the type of facility (whether Commercial/Hotel/Hospital and many more) get the actual demand multiplying with the DEMAND FACTOR. Then use a steady state equation (Ref. ASPE Vol2, Chpt6) to estimate the heating required in KW. Also keep in mind about the system; if it is a heat recovery system using HWR (hot water return) piping, then there is a separate guideline for estimating heating KW. Spreadsheet attached.

magdy abd al nour
par magdy abd al nour , HVAC Site manger , First United Co.

calculate the heating load by hap or block load or any other way.....the heater type dont ,meater,electrical or oil or boiler

Ahmed Gahlan
par Ahmed Gahlan , Senior Technical Engineer , Saudi Binladin Group. (Public Buildings & Airports Division)

Dear Sherief

I'm not an expert in plumbing but I have an idea about how to size and I hope I could be of help, find below a guide on how to size your water heater

To size water heater you need to identify the following as a1st step:-

1- type of water heater (tankless/storage/ solar water heater)

2- demand ( amount of water flow rate in case of tankless and bulk mass in case of storage)

3- Temperature rise ( maximum - minimum temperature)

Once you identified those3 basis you can move on to the calculations, I found some sources that can be beneficial for you , below are the links but for more details I suggest you take a look at the IPC and Plumbing design Handbook,

http://energy.gov/energysaver/articles/sizing-new-water-heater

bfa.sdsu.edu/ehs/pdf/HotWater.doc

best Regards

Ahmed Gamal

 

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