Energy efficiency for gas-fired and oil-fired domestic heating and hot water systems

1. Energy efficiency for gas-fired and oil-fired domestic heating and hot water systems Session 2: Minimum boilerefficiency standards for gas-fired and oil-fired heating appliances connected to ‘wet’ heating circuits

2. Energy efficiency for gas-fired and oil-fired domestic heating and hot water systemsSession 2 – minimum boilerefficiency standards for gas-fired and oil-fired heating appliances connected to ‘wet’ heating circuits Session Objectives and Activities During the session you will: • Research requirements and sources of guidance for boiler efficiency standards for gas-fired and oil-fired heating appliances connected to ‘wet’ heating circuits • Be able to find the requirements and parameters for boiler efficiency standards for gas-fired and oil-fired heating appliances connected to ‘wet’ heating circuits • Complete calculations related to boiler efficiency • Feed back to the group regarding the websites and information you find and the calculations and strategies to improve energy efficiency

3. Energy efficiency for gas-fired and oil-fired domestic heating and hot water systemsSession 2 – minimum boilerefficiency standards for gas-fired and oil-fired heating appliances connected to ‘wet’ heating circuits Key websites If you are unsure where to look for regulatory information and guidance, try one or more of the following websites: • UK government Planning Portal www.planningportal.gov.uk • Building and Engineering Services Association (B&ES) www.b-es.org/b-es-connections/technical/ • Energy Saving Trust www.energysavingtrust.org.uk/organisations • Scottish and Northern Ireland Plumbing Employers’ Federation www.snipef.org/ • Welsh Government www.wales.gov.uk/topics/planning • Chartered Institution of Building Services Engineering www.cibse.org Do not feel you must limit your search to these sites if you have ideas of others worth exploring.

4. Energy efficiency for gas-fired and oil-fired domestic heating and hot water systemsSession 2 – minimum boilerefficiency standards for gas-fired and oil-fired heating appliances connected to ‘wet’ heating circuits Key web pages You may have found a range of websites that contain relevant information. Note the key websites in your course folder for future reference. Tutor to add specific websites if felt helpful Websites, regulations and standards are frequently updated so you may want to revisit websites and conduct further research in future to ensure you are always using the latest information.

5. Energy efficiency for gas-fired and oil-fired domestic heating and hot water systemsSession 2 – minimum boilerefficiency standards for gas-fired and oil-fired heating appliances connected to ‘wet’ heating circuits Worksheet Students should work individually to complete the session worksheet, with access to either hard copy or online versions of the Domestic Heating Compliance Guide. Answers are given on the following slides. Statements to support questions Boiler efficiency may be indicated by: • Combustion Efficiency - indicates a burner’s ability to burn fuel, measured by unburned fuel and excess air in the exhaust • Thermal Efficiency - indicates the heat exchanger’s effectiveness to transfer heat from the combustion process to the water or steam in the boiler, exclusive radiation and convection losses • Fuel to Fluid Efficiency - indicates the overall efficiency of the boiler inclusive thermal efficiency of the heat exchanger, radiation and convection losses - output divided by input. Boiler efficiency is, in general, indicated by either Thermal Efficiency or Fuel to Fluid Efficiency depending on the context.

6. Energy efficiency for gas-fired and oil-fired domestic heating and hot water systemsSession 2 – minimum boilerefficiency standards for gas-fired and oil-fired heating appliances connected to ‘wet’ heating circuits Solutions Question 1 SEDBUK stands for Seasonal Efficiency of a Domestic Boiler in the UK. Question 2 Boiler rate data information should be on the boiler data plate and in the boiler manual/instructions.

7. Energy efficiency for gas-fired and oil-fired domestic heating and hot water systemsSession 2 – minimum boilerefficiency standards for gas-fired and oil-fired heating appliances connected to ‘wet’ heating circuits Solutions Question 3 A result of insufficient supply of mixed fresh air to the combustion of natural gas can be soot deposits and increased carbon monoxide. Question 4 The following types of gas-fired heating systems are addressed under section 2.1 of the Domestic Heating Compliance Guide: • Range cookers with integral heating boilers • Wet heating central heating systems

8. Energy efficiency for gas-fired and oil-fired domestic heating and hot water systems Session 2 – minimum boilerefficiency standards for gas-fired and oil-fired heating appliances connected to ‘wet’ heating circuits Question 5 The CO2 emissions factors should be taken from table number 12 of the SAP 2005 when installing gas-fired replacement systems in existing dwellings. Question 6 The seasonal efficiency (SEDBUK) value of an oil-fired range cooker, with integral central heating boiler, should not be less than 80%. Solutions

9. Energy efficiency for gas-fired and oil-fired domestic heating and hot water systems Next session: non-condensing and condensing boiler installations, and requirements in relation to space heating primary circuits type and design for gas-fired and oil-fired wet heating systems During this session you will • Familiarise yourselves with the ‘Guide to condensing boiler installation assessment procedure for dwellings’ and associated parameters • Complete calculations relating to boiler installations • Research requirements related to space heating primary circuits types and design for gas-fired and oil-fired wet heating systems • Discuss websites and information you have found