TECHNICAL
41
Geothermal Hot Spring Water Extraction heats groundwater which emerges from the crust of the earth .
The Biomass System burns biological matter and outputting the resulting heat for use in heating systems . More applicable in a central heating system as the gas and air produced travels through a flue , then a heat exchanger .
SANS 10400 XA : 2011 – Energy usage in Buildings , spells out the Hot Water supply requirements in Section 4 , subsection 4.1 Hot Water Supply .
• 4.1.1 In order to comply with functional regulation XA 2 , contained in part XA of the national Building Regulations , the following guidance is provided : a . the volume of the annual average hot water heating requirements shall be calculated in accordance with tables 2 and 5 of SANS 10252-1 and b . if solar water heating systems are used , these shall comply with SANS 1307 , SANS 10106 , SANS 10254 , and SANS 10252-1 .
• 4.1.2 . Requirements for water installations in buildings shall be in accordance with SANS 10252-1 and SANS 10254 .
• 4.1.3 . all hot water service pipes shall be clad with insulation with a minimum R-value in accordance with table 1 below .
• 4.1.4 Thermal insulation , if any , shall be installed in accordance with the manufacturer ’ s instructions .
Table 1 – minimum R-values of pipe insulation 1 2 Internal diameter of pipe ( mm ) Minimum R – value ( a ) < 80 > 80
1.00 1.50 a .
Determined with a hot surface temperature of 60 degrees C and an ambient temperature of 15 degrees C .
The Normative references in XA and 204 are considered indispensable for the application of both documents . Indispensable meaning ‘ absolutely necessary – not subject to being set aside or neglected ’. Simply put , obligatory .
* A review of water heating technologies : An application to the South African context – Science Direct . Vol 5 Nov 2019 . PA
“ The Normative references in XA and 204 are considered indispensable for the application of both documents . Indispensable meaning ‘ absolutely necessary – not subject to being set aside or neglected ’.”
May 2021 Volume 27 I Number 3 www . plumbingafrica . co . za