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Update to design section
A selection of video content covering key aspects of heating design
A selection of video content covering key aspects of heating design
Video #001
Video #001
Video #002
Video #002
Video #003
Video #003
The U Value indicates how good materials are at retaining heat, usually applied to walls, windows or doors.
The lower the U Value the better the thermal performance will be. So if you have some insulation in your walls you will want to achieve a U Value as close to zero as possible.
Knowing the U Value of installations and insulation that you have or are looking to have in your home is important if you want to understand how thermally efficient your home is or could be.
Solid brick wall: 2 W/(m²K)
Cavity wall with no insulation: 1.5 W/(m²K).
Insulated wall: 0.18 W/(m²K).
Single glazing: 4.8 to 5.8 W/(m²K).
Double glazing: 1.2 to 3.7 W/(m²K) depending on type.
Triple glazing below: 1 W/(m²K).
Solid timber door: 3 W/(m²K).
Video #004
Video #004
Video #005
Video #005
Documents related to heating design
Documents related to heating design
The British Standards
The British Standards
BSEN 12828 heating systems in buildings. Design for water based heating systems
BSEN 12831 heating systems in buildings. Method for calculation of the design heat load.
BSEN 14336 heating systems in buildings. Installation and commissioning of water based heating systems.
BSEN 1264-1 floor heating. Systems and components. Definitions and symbols.
BSEN 1264-2 water based surface embedded heating and cooling systems. Floor heating. Proving methods for the determination of the thermal output using calculation and test methods.
BSEN 1264-3 water based surface embedded heating and cooling systems. Dimensioning.
BSEN 1264-4 water based surface embedded heating and cooling systems. Installation.
BSEN 442 specification for radiators and convectors.
Regulations and Approved Documents
Regulations and Approved Documents
Building Regulations
Approved documents Part L1A conservation of fuel and power in new dwellings
Approved documents Part L1B conservation of fuel and power in existing dwellings
Approved documents Part F ventilation
Approved documents Part J combustion appliances and fuel storage systems
The water supply (water fittings) regulations 1999
The gas safety (installation and use) regulations 1998
BS7671 the IET wiring regulations 18th edition
Recommendations
Recommendations
Domestic heating compliance guide - a free document that can be downloaded from www.planningportal.gov.uk/buildingregulations/approveddocuments/partl/bcassociateddocuments9/compliance
It offers practical assistance when designing and installing systems.
Central Heating System Specification (CHeSS) this publication offers compliance advice and best practice for the installation of heating systems.
Chartered Institute of Building Services Engineers (CIBSE) Domestic heating compliance guide produced to help engineers to specify and design wet central heating systems.
Table of Expansion Vessel Sizing
Table of Expansion Vessel Sizing
Sizing a Heating Boiler
Sizing a Heating Boiler
Review of Heating Design
Review of Heating Design
In addition to the above the following things must be considered by the engineer and customer.
Humidity
Air changes
Air temperature
Air velocity
Activity within the building
Clothing
Age and health
Simplified Calculations
Simplified Calculations
Formulas
Formulas
The mean water temperature = (flow temp. + return temp.)/2
Temperature difference = Mean temp. - Room temp.
Overall correction factor = f1 x f2
Radiator size = total heat loss/overall correction factor
2013-04-21
Radiation Correction Factor - F2
Radiation Correction Factor - F2
Top and bottom opposite-end connections 1.00
Bottom opposite-end connections with blind nipple 0.97
Bottom opposite-end connections 0.90
https://www.radiatorshowroom.com/correction-factors-50-w.asp
Hot Water Design Considerations
Hot Water Design Considerations
Part 1 Hot Water Design & Information
Part 1 Hot Water Design & Information
Radiator Sizing
Radiator Sizing
When sizing radiators it is crucial to ascertain the Delta T the difference in temperature between the water circulating in the central heating system and that of the ambient or room temperature. This is simple to work out and it is as follows:
Identify the room temperature
Identify the MWT (mean water temperature)
Remove the ambient room temperature to identify the Delta T
Example; Room temperature of 20 degrees, MWT (75 flow and 65 return) add these together and divide by 2 = 70 degrees MWT. This then has the ambient room temperature removed 70 - 20 = 50 degrees.
Then you can look at sizing a heat emitter (radiator) from a manufacturers catalogue.
See below for an example catalogue. The process of finding the delta T is the same for a Heat Pump system too but the Delta T will be lower as the temperature of water from this heat source will be typically lower, the catalogue below shows sizes of readiators for Delta T's at 30 and 50 degrees.
Myson Complete Solutions - Full Brochure.pdfPage updated
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