CPD Programme
CPD Programme
The CIBSE Journal CPD Programme
Members of the Chartered Institution of Building Services Engineers (CIBSE) and other professional bodies are required to maintain their professional competence throughout their careers. Continuing professional development (CPD) means the systematic maintenance, improvement and broadening of your knowledge and skills, and is therefore a long-term commitment to enhancing your competence. CPD is a requirement of both CIBSE and the Register of the Engineering Council (UK). CIBSE Journal is pleased to offer this module in its CPD programme. The
programme is free and can be used by any reader. It is organised jointly by CIBSE Journal and London South Bank University, and will help you to meet CIBSE’s requirement for CPD. It will equally assist members of other institutions, who should record CPD activities in accordance with their institution’s guidance. Simply study the module and complete the
questionnaire on the fi nal page, following the instructions for its submission. Modules will remain available online at www.cibsejournal. com/cpd while the information they contain remains current. You can also undertake the questionnaire online, and receive your results by return email.
The increasing potential for ground source heat pumps
The recent Renewable Heat Incentive proposals have clearly confi rmed that the UK government considers that technologies including both air source and ground source heat pumps are deemed ‘renewable’. This CPD module outlines the drivers for the selection of GSHPs and outlines some examples of how novel application might further improve their appeal
Using Products) Directive and the Code for Sustainable Homes are placing ever increasing demands on improved appliance and system effi ciency for space heating and hot water generation. Building heating and hot water systems
T
are more frequently becoming ‘bivalent’ with a combination of heat sources being deployed in plant rooms to deliver the carbon savings demanded by local authorities and the underpinning legislation. Commercial heating and hot water systems will inevitably need to include a combination of conventional products such as boilers, direct- fi red water heaters and calorifi ers married with more innovative technologies such as solar thermal, heat pumps and combined heat and power (CHP) in order to deliver low carbon plant room solutions.
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he conjunction of changes in Part L of the Building Regulations, impending European legislation prompted by the EuP (Eco-Design of Energy
The UK government’s Renewable Heat Incentive (RHI) is planned for introduction in April 2011 and is aimed at supporting heating at all scales, including households, businesses, offi ces, public sector buildings and industrial processes. The ‘clean energy cashback’ tariff levels proposed by the RHI for biomass, biogas, heat pumps and solar thermal vary according to installed system size. Ground source heat pumps up to 45 kW will qualify for tariffs of 7 pence/kWh; between 45 kW and 350 kW, 5.5 pence/kWh and those above 350kW will qualify for a tariff of 1.5 pence/kWh. The two lower bands would not require any metering of energy supplied to the building by the GSHP (being based on installation size and deemed annual generation) and the payments would be made for at least 20 years. Despite the proposed legislation being a year away systems that are installed now (that are certifi ed and registered under the Microgeneration Certifi cation Scheme,
MCS) would benefi t. The MCS (or equivalent schemes accredited under EN 45011 [1]), certify microgeneration products and installers in an attempt to provide consistent European standards.
The principle for ground source heat extraction
The ground source heat pump is driven by solar radiation that, in this case heats the ground; as well as the continuous fl ow of heat from the earth’s core. As a result, the ground temperature shows seasonal fl uctuations to depths of about 15 m where the temperature is approximately equal to the mean annual air temperature (8 - 11°C in the UK) [2]. The temperatures above this will alter
throughout the year as illustrated by the graphs in Figure 1 [3]. Ground source heat pumps use this stored energy to provide a thermal source for one side of a refrigeration cycle recovered through the use of a ‘ground loop’ that draws its heat from either ‘open’
April 2010 CIBSE Journal
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