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Anonymous Poster #1

Hot Water System

08/31/2017 6:09 AM

Hello CR4 I wan to do Hot water design for high rise building by heat pump system. So which code will I approch and which book can I understand to hot water design and calculation? I m not family with hot water system. Best regards NT

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Guru
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#1

Re: hot water system

08/31/2017 6:22 AM

Rather than books, how about using a Mentor? Is there really no-one in the organisation that has done this sort of work before and who could be brought into the project? If not then, pray, how was the work secured by tender?

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#4
In reply to #1

Re: hot water system

08/31/2017 8:49 AM

Hot water services should be designed and installed in accordance with the Water Supply Regulations 1999 and relevant parts of BS 6700:1997 and BS EN 806-2:2005.

HOT WATER CONSUMPTION

Depending on demand and type of building there are generally three ways of meeting hot water consumption need:

• Locally generated

• Centrally generated

• Plate heat exchangers

The following examples are indicative of where the above sources can be used:

• Local generation where there are several satellite toilet areas and hot water is used for hand washing only

• If the project requires large volumes of water for different purposes then a central storage system should be considered

• If the project requires large volumes, has a large energy source available which can react quickly and has limited space for plant then plate heat exchangers should be considered

STORAGE AND CIRCULATION

• Water must be stored at temperatures of 60°C and above.

• It should be circulated at 55°C.

• The hot water storage capacity should be related to the design consumption rate and the recovery rate.

• Total hot water capacity increased by the use of shunt pumps to eradicate temperature stratification.

• System design should minimise deadlegs that allow water to stagnate.

AT POINT OF USE

• Water circulating at 55°C presents a scalding risk to users. TMVs should be installed at the point of use to reduce the water temperature to a safe level.

• Taps that blend water at the point of use can present a scalding risk to vulnerable users as the body of the tap can heat up. Care should be taken to ensure product selection limits this risk.

• Design codes for health buildings require that all draw off points that can be used by patients, etc, have the temperature of hot water limited to a safe level. This also extends to elderly care homes and sheltered dwellings, which are under the responsibility or licenced by the local authority. Other buildings that require consideration are nurseries, schools, and anywhere where there is a “duty of care” by the building owner’s landlord, and/or management.

See Tables:

https://www.radacontrols.com/media/58812/guide-to-hot-water-systems-tmvs-in-commercial-buildings.pdf

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#5
In reply to #1

Re: hot water system

08/31/2017 9:18 AM

Sorry, was sent to you by mistake

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#2

Re: Hot Water System

08/31/2017 8:10 AM

You'll need to flesh out your proposed design a little more, starting with the building's intended use, central water heating or individual, building height/stories, source of heat etc

https://www.aspe.org/sites/default/files/webfm/ArchivedIssues/2003/Jan_Feb_03/28-34.pdf

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#7
In reply to #2

Re: Hot Water System

08/31/2017 6:06 PM
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Guru
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#3

Re: Hot Water System

08/31/2017 8:18 AM

The best <...book...> will be the organisation's design calculations and "as built" records of previous installations. These can be used as foundations for the new one.

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#8
In reply to #3

Re: Hot Water System

08/31/2017 9:53 PM

yes, i have many project. I can refer this projects but I don't know technically. i have served long time by draft person. But I'd like to know . . in central system - I m not ask technical question. Request only standard code or lesson of hot water central system. - how to deside and calculate the hot water return pump size. Moreover, how to this pump serve for return line? - how to calculate the how water capacity - sizing of Heat pump - sizing of hot water cylinder - i want to read, how many flow rate, how many capacity for person or fixtures. because, we can know flow rate and capacity of cold water by standard code. Best regards NT

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#6

Re: Hot Water System

08/31/2017 11:08 AM

Have you at all looked into your local building codes? Meeting these codes in the initial design will prevent retrofitting expenses.

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#9

Re: Hot Water System

08/31/2017 10:50 PM

Yes. We need more engineers like him designing our multi-rise hot water systems. No experience, no capability, no understanding. No-wonder systems don't work.

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