Abstract
To provide useful information concerning energy-conserving heating, ventilation, and air-conditioning (HVAC) systems, this study used EnergyPlus to analyze in detail their operational characteristics and energy performance. This study also aimed to understand the features of the systems under consideration by investigating the dry-bulb temperature, relative humidity, and airflow rate at major nodes in each system’s schematic. Furthermore, we analyzed the indoor environment created by each HVAC system, as well as examining the cooling energy consumptions and CO2 emissions. The HVAC systems selected for this study are the variable air volume (VAV) commonly used in office buildings (base-case model), constant air volume (CAV), under-floor air distribution (UFAD), and active chilled beam (ACB) with dedicated outdoor air system (DOAS). For the same indoor set-point temperature, the CAV’s supply airflow was the highest, and VAV and UFAD were operated by varying the airflow rate according to the change of the space thermal load. ACB with DOAS was analyzed as being able to perform air conditioning only with the supply airflow constantly fixed at a minimum outdoor air volume. The primary cooling energy was increased by about 23.3% by applying CAV, compared to VAV. When using the UFAD and ACB with DOAS, cooling energy was reduced by 11.3% and 23.1% compared with VAV, respectively.
Highlights
When using the underfloor air distribution (UFAD) and active chilled beam (ACB) with dedicated outdoor air system (DOAS), cooling energy was reduced by 11.3% and 23.1% compared with variable air volume (VAV), respectively
As temperatures continue to increase due to climate change, heat waves are expected to increase in intensity and frequency [3,4,5,6]
The results provided a detailed understanding of air transport and its consequence on thermal comfort and indoor air quality that are beneficial to office building air conditioner design
Summary
The Intergovernmental Panel on Climate Change (IPCC) predicts that the average global temperature will rise by 1.4–5.8 ◦ C between 1990 and 2100 [1,2]. As temperatures continue to increase due to climate change, heat waves are expected to increase in intensity (e.g., hotter days and nights) and frequency (more frequent heat and cold waves) [3,4,5,6]. EnergyPlus isis aa simulation simulation program program that that combines combines the the advantages advantages of of the the DOE-2. BLAST models, and is used in the US as an authorized simulation program to design new buildings models, and is used in the US as an authorized simulation program to design new buildingsand and estimate estimate energy energy performance performance [16].
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