Analysis of vertical ground loop heat exchangers applied to buildings in the UK

The work presented here deals with the design and performance of ground-source heat pumps and ground-sink cooling systems using vertical borehole arrays for commercial applications in the UK. Heating and cooling energy demands for a range of building and HVAC plant options are obtained by thermal modelling applied to four HVAC plant options: space heating only; heating with chilled ceilings; fan coil units and constant volume all-air plant. Ground loop designs are conducted for each system option using an impulse-response method and the parameters extracted from this are used in 10-year simulations of plant response which have been carried out using HVACSIM+. The 10-year time horizon was used to assess any degradation in earth temperature over time. The results show that a substantial reduction in energy (and, hence, carbon) can be expected of up to and exceeding 50% when using ground source heat pumps for winter heating with direct cooling in summer in association with moderate temperature cooling systems such as chilled ceilings. A degradation of earth temperature was evident with systems utilising limited cooling or no cooling but this did not appear to influence heat pump performance greatly. Practical Applications: Design and performance data for use in vertical ground loop (borehole) heat exchanger arrays providing source heat for heat pumps as well as direct cooling for buildings are generated and reported in this paper. The data should be of help to design practitioners for the sizing of borehole arrays for both heating and cooling. Design and performance matching to a wide variety of HVAC combinations, building energy demand levels and two contrasting sets of earth thermal property data are included so that practitioners will be able to select results that suit a range of modern applications. Also included are results of 10-year energy simulations that demonstrate the required design and operating conditions needed to ensure that initial undisturbed earth conditions will not drift with time to an unacceptable extent. Comparisons are made with conventional heating and cooling methods so that estimates of carbon savings due to the use of ground-coupled heat pumps with (and without) direct cooling can be made

Energy and economic analysis of Vacuum Insulation Panels (VIPs) used in non-domestic buildings

The potential savings in space heating energy from the installation of Fumed Silica (FS) and Glass Fibre (GF) Vacuum Insulation Panels (VIPs) were compared to conventional expanded polystyrene (EPS) insulation for three different non-domestic buildings situated in London (UK). A discounted payback period analysis was used to determine the time taken for the capital cost of installing the insulation to be recovered. VIP materials were ranked using cost and density indexes. The methodology of the Payback analysis carried out considered the time dependency of VIP thermal performance, fuel prices and rental income from buildings. These calculations show that VIP insulation reduced the annual space heating energy demand and carbon dioxide (CO2) emissions by approximately 10.2%, 41.3% and 26.7% for a six storey office building, a two floor retail unit building and a four storey office building respectively. FS VIPs had the shortest payback period among the insulation materials studied, ranging from 2.5 years to 17 years, depending upon the rental income of the building. For GF VIPs the calculated payback period was considerably longer and in the case of the typical 4 storey office building studied its cost could not be recovered over the life time of the building. For EPS insulation the calculated payback period was longer than its useful life time for all three buildings. FS VIPs were found to be economically viable for installation onto non-domestic buildings in high rental value locations assuming a lifespan of up to 60 years

Public toilets: The need for compulsory provision

There is no mandatory requirement for local authorities to provide public toilets. Yet, it is argued, they are a vital component in creating accessible, sustainable and comfortable cities for all. In this paper the reasons for compulsory standards are explained, and the underlying problems of current provision and regulation are investigated. The nature of a spatial toilet strategy in respect of the adequate distribution and location of public toilets is outlined. Changes in the regulatory and organisational aspects of public toilet provision are proposed that would result in a better standard of facilities for twenty-first century needs

The aluminium extrusion industry

Best practice programmeSIGLEGBUnited Kingdo

The Building Act 1984 The Building Regulations 2000: proposals for new safety requirements for electrical installation work in dwellings

SIGLEAvailable from British Library Document Supply Centre-DSC:m02/27323 / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Proposals for a scheme of insurance for approved inspectors

Consultation paperAvailable from British Library Document Supply Centre-DSC:GPE/1097 / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo

The Building Act 1984 Guidelines for the approval of inspectors; consultation letter

SIGLEAvailable from British Library Document Supply Centre- DSC:MFE 1169(CH--92.1529)(microfiche) / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Ventilation Proposed amendments to Part F of the Building Regulations 1991

SIGLEAvailable from British Library Document Supply Centre- DSC:MFE 1169(CH--93.2540)(microfiche) / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Building Act 1984 Proposals for amendments to the Building (Approved Inspectors etc) Regulations 1985; procedures for approval of corporate bodies and individuals as approved inspectors

SIGLEAvailable from British Library Document Supply Centre-DSC:GPE/0696 / BLDSC - British Library Document Supply CentreGBUnited Kingdo