Browsing by Author "Loveday, D. L."
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Item Metadata only CFD modelling of naturally ventilated double-skin facades with venetian blinds.(2008) Ji, Y.; Cook, M. J.; Hanby, V. I. (Victor Ian), 1942-; Infield, D. G.; Loveday, D. L.; Mei, L.Item Metadata only The cooling potential of earth-air heat exchangers for domestic buildings in a desert climate(Elsevier, 2006) Al-Ajmi, Farraj F.; Loveday, D. L.; Hanby, V. I. (Victor Ian), 1942-A theoretical model of an earth–air heat exchanger (EAHE) isdeveloped for predicting the outlet air temperature and cooling potential of these devices in a hot, arid climate. The model is validated against other published models and shows good agreement. A sub-soil temperature model adapted for the specific conditions in Kuwait is presented and its output compared with measurements in two locations. A building model representative of a typical Kuwaiti dwelling has been implemented and all the models have been encoded within the TRNSYS-IISIBAT environment. A typical meteorological year for Kuwait wasprepared and used to predict the cooling loads of the air-conditioned dwelling with and without the assistance of the EAHE. Simulation results showed that the EAHE could provide a reduction of 1700Win the peak cooling load, with an indoor temperature reduction of 2.8 1C during summer peak hours (middle of July). The EAHE is shown to have the potential for reducing cooling energy demand in a typical house by 30% over the peak summer season.Item Metadata only Experimental and computational investigation into suppressing natural convection in chilled ceiling/displacement ventilation environments(Elsevier, 2011) Taki, A. H.; Jalil, L.; Loveday, D. L.The combination of chilled ceiling and displacement ventilation systems can cause destruction of the displacement flow pattern in some circumstances. This paper reports on the performance of a new technique for achieving stable conditions for displacement airflow in the presence of a chilled ceiling system. The technique is based on the attachment of a honeycomb slat system to the underside of a chilled ceiling, thereby suppressing downward cool natural convection. Investigations were carried out using both computational and experimental methods for a range of typical office environment conditions. The results showed that a slat depth to width ratio of 10 could suppress the natural convection by more than 80% when the Rayleigh number reached 7×106. This confirms that the technique is capable of minimising downward cool air currents, resulting in preservation of the displacement low pattern in the presence of the chilled ceiling. The proposed slat system can raise the general air temperature in the space allowing some displacement flow pattern to occur. The outcome of this study is the emergence of a honeycomb slat-based approach for improving the performance, together with provision of general advice for designers as regards the combination of radiant cooling/displacement ventilation systems.Item Open Access Measuring the potential of zonal space heating controls to reduce energy use in UK homes: The case of un-furbished 1930s dwellings(Elsevier, 2015-01-28) Beizaee, A.; Allinson, David; Lomas, K. J.; Foda, Ehab; Loveday, D. L.A matched pair of 1930s semi-detached houses, in original condition and un-refurbished in terms of energy efficiency, were employed to measure the energy savings that might result from the use of zonal space heating control (ZC). The houses were adjoined and had the same synthetic, yet realistic, occupancy schedule, the same new central heating system, and were exposed to the same weather conditions. In one house the space heating was controlled conventionally (CC) according to minimum requirements in UK Building Regulation Part L1B for existing dwellings, whereas in the other house ZC was used to heat the rooms only when they were ‘occupied’. Over an 8-week winter test period, the house with ZC used 11.8% less gas despite 2.4 percentage points drop in average daily boiler efficiency. Although zonal control reduced the mean indoor air temperature of the whole house by 0.6 °C, it did not reduce the average air temperature in rooms during the hours of active ‘occupancy’. Normalisation and extrapolation of the results shows that, compared to CC, ZC could reduce annual gas demand for space heating by 12% in most regions of the UK, and that ZC would be a more effective energy efficiency measure in homes in the cooler, more northerly regions of the UK.Item Metadata only Nodal network and CFD simulation of airflow and heat transfer in double skin facades with blinds.(Sage, 2008) Hanby, V. I. (Victor Ian), 1942-; Cook, M. J.; Infield, D. G.; Ji, Y.; Loveday, D. L.; Mei, L.Item Metadata only The optimal design for a ground cooling tube in a hot, arid climate(Chartered Institution of Building Services Engineers, 2004) Hanby, V. I. (Victor Ian), 1942-; Al-Ajmi, Farraj F.; Loveday, D. L.