Abstract:In the Hong Kong Building Environmental Assessment Method (HK-BEAM) for air-conditioned office premises, energy use for air-conditioning constitutes one major item of assessment. The current assessment method for existing offices is based on computer simulation predictions. Following a recent review of the HK-BEAM scheme, simplified models have been developed for use in the assessment as an alternative to the detailed simulation method. These models are multiple linear regression models relating the annual ele… Show more
“…The performance catalogue of the heat pipe gave some design and calculation methods [17,18], so in the subsequent energy saving evaluations, heat pipe effectiveness of 0.6 was chosen. …”
Section: The Energy Simulation Results Of the Dedicated Ventilation Smentioning
confidence: 99%
“…The corresponding savings range from 16% to 21%. Considering fresh air contributes to around 30% of the overall consumption for air-conditioning for Southern China [18], the energy savings can account for approximately 9%-12% of the overall energy use for fresh air system. …”
Abstract:Research results have identified the use of heat pipe heat exchangers (HPHXs) for heat recovery as a way to reduce the pre-cooling and re-heating energy. This paper suggests decoupling dehumidification from cooling to reduce energy consumption. The feasible usage and the energy saving potential of heat pipe heat exchanger at the air handler dedicated in accomplishing this objective is investigated. In this paper a dedicated ventilation system combined with a HPHX to reduce energy consumption is tested and investigated under varying conditions by laboratory experiments. The energy saving potential and heat pipe (HP) effectiveness are tested and calculated under various outdoor conditions. The simulation and experimental results demonstrate that for all cases examined, the average HP effectiveness and energy savings have the same trend at various outdoor temperatures and Relative Humidity (RH) values. It has been found that the heat pipe can be applied to save over 60% energy for the air-conditioning operating hours. The reduction in overall energy is from 1.8% to 2.8% for the whole system. Therefore, the results confirm that the proposed set-up is useful for buildings to achieve intended energy saving objectives in subtropical climates where air-conditioning demand is highly variable.
“…The performance catalogue of the heat pipe gave some design and calculation methods [17,18], so in the subsequent energy saving evaluations, heat pipe effectiveness of 0.6 was chosen. …”
Section: The Energy Simulation Results Of the Dedicated Ventilation Smentioning
confidence: 99%
“…The corresponding savings range from 16% to 21%. Considering fresh air contributes to around 30% of the overall consumption for air-conditioning for Southern China [18], the energy savings can account for approximately 9%-12% of the overall energy use for fresh air system. …”
Abstract:Research results have identified the use of heat pipe heat exchangers (HPHXs) for heat recovery as a way to reduce the pre-cooling and re-heating energy. This paper suggests decoupling dehumidification from cooling to reduce energy consumption. The feasible usage and the energy saving potential of heat pipe heat exchanger at the air handler dedicated in accomplishing this objective is investigated. In this paper a dedicated ventilation system combined with a HPHX to reduce energy consumption is tested and investigated under varying conditions by laboratory experiments. The energy saving potential and heat pipe (HP) effectiveness are tested and calculated under various outdoor conditions. The simulation and experimental results demonstrate that for all cases examined, the average HP effectiveness and energy savings have the same trend at various outdoor temperatures and Relative Humidity (RH) values. It has been found that the heat pipe can be applied to save over 60% energy for the air-conditioning operating hours. The reduction in overall energy is from 1.8% to 2.8% for the whole system. Therefore, the results confirm that the proposed set-up is useful for buildings to achieve intended energy saving objectives in subtropical climates where air-conditioning demand is highly variable.
“…Building energy use is substantially affected by the indoor design conditions including: the space set-point temperature (dry bulb) and relative humidity, ventilation rate, occupancy density, and lighting and equipment power intensities [37]. Table 1 illustrates that the baseline indoor design conditions for CBEC are different to the proposed design values.…”
“…one meeting basic or minimum local code requirements (Lee et al, 2001a). The assessment seeks to quantify as a percentage the extent to which the enhancements included in the design of the assessed building improve on the defined benchmark, rewarding improvements on a sliding scale (e.g.…”
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