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عنوان فارسی مقاله:
تاثیر رفتار تقاضای ناهمزمان بر کولینگ بالا در سیستم های AC ناحیه چندگانه
عنوان انگلیسی مقاله:
Influence of asynchronous demand behavior on overcooling in multiple zone AC systems
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Heating, ventilating, and air conditioning (HVAC) systems control the thermal comfort and air quality of buildings, and account for approximately 50% of the total electricity consumption of office buildings [1e5]. Against the background of global warming and the corresponding increasing demand for cooling, studies on HVAC system performance are gaining importance [6e9]. Two typical multiple zone system schemes are the constant air volume (CAV) and variable air volume (VAV) systems. Due to the long histories, both systems have been widely studied experimentally and numerically [10e12]. Overcooling is a significant problem for both systems [13e16]. Chen pointed out that overcooling is a common phenomenon in offices with air conditioning and mechanical ventilation (ACMV) systems in the tropics. The main contributors to this issue might include both human acclimatization as well as the current design of ACMV with VAV systems [17]. Summer overcooling is also common in the United States [13]. Edward et al. [14] surveyed six buildings in the Yahoo! campus during the warm season; they found that 37.4% of the population of 83 occupants felt slightly cool to cold. Aynur's study [15] revealed that because of overcooling, the VAV system with no-reheat boxes consumed approximately 30% more energy than the variable refrigerant flow (VRF) system, and the state of indoor thermal comfort worsened. Hoyt et al. [16] found that in both simulated and empirical cases with VAV systems, the zone airflow was very close to the minimum set point; further, in the simulated case, the zone was at the heating set point for approximately 70% of the operation time, indicating the high frequency of overcooling. Many studies have addressed the improvement of thermal environment and reduction of energy consumption. VAV systems and VRF systems were compared through simulation [15]; the study concluded that the indoor temperature could not be maintained properly by VAV without reheat boxes. However, VAV boxes with reheat boxes can offer better thermal environment with a significant energy consumption penalty [15]. Overall, the VRF AC system guarantees 27.1e57.9% energy-saving potentials [15]. The possibility of reducing the minimum airflow set points of the VAV box was studied [14,18]. Zhang et al. [18] found that when the minimum airflow is reduced from 30% to 20%, 40% of the reheat energy can be saved. Arens et al. [14] evaluated the thermal comfort of the occupants, air quality satisfaction, and energy consumption * Corresponding author. in operating buildings with both conventional and reduced minimum variable air volume flow set points, and determined the positive effect of lowering the minimum airflow set points. Meanwhile, many other potential methods to improve multiple zone AC systems were explored: for example, extending air temperature set points [15], occupancy-based energy-efficient climate control [19], and CO2-based dynamic reset with VAV box minimum airflow set points [20].
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کلمات کلیدی:
[PDF]Control of Thermally Activated Building System Considering Zone ... www.mdpi.com/2071-1050/9/4/586/pdf by WJ Chung - 2017 Apr 11, 2017 - Seoul National University, Seoul 08826, Korea; msyeo@snu.ac.kr ... Keywords: thermally activated building system; multiple zones; ... This function is commonly provided by the heating and cooling system, which ... Appropriate heat should be supplied into a zone without causing overheating, overcooling. [PDF]HVAC Delivery Systems www.caee.utexas.edu/prof/Novoselac/.../HVAC_Delivery_Systems_Ch3_2-12-08.pdf When the air-handling unit serves multiple spaces with different load ... In HVAC terminology, a zone is an area for which temperature is .... a humidifier or removed by overcooling the air to ... Controllers provide the decision-making function of the control .... demand and shutting down equipment to prevent con- sumption ... Demand controlled ventilation for multiple zone HVAC systems—Part ... https://www.researchgate.net/.../282514362_Demand_controlled_ventilation_for_multip... Demand controlled ventilation for multiple zone HVAC systems—Part 2: CO 2 ... Influence of asynchronous demand behavior on overcooling in multiple zone AC ... Selecting HVAC systems for typical UK office buildings (PDF ... https://www.researchgate.net/.../286004015_Selecting_HVAC_systems_for_typical_UK... Official Full-Text Publication: Selecting HVAC systems for typical UK office ... Influence of asynchronous demand behavior on overcooling in multiple zone AC ... . Dual-maximum control logic. - Figure 3 of 11 - ResearchGate https://www.researchgate.net/.../276461635_fig3_Fig-4-Dual-maximum-control-logic Estimated detection probabilities as a function of the number of days of ... of asynchronous demand behavior on overcooling in multiple zone AC systems. Xin Zhou-| ScholarMate www.scholarmate.com/scmwebsns/resume/view?des3PsnId... Translate this page Xin zhou; Da Yan; Yi Jiang; Xing Shi, Influence of asynchronous demand behavior on overcooling in multiple zone AC systems, Building and Environment, Vol ... [PDF]Comparing The energy savings of different VAV systems https://www.amca.org/UserFiles/file/WhitePaper_-_ComparingEnergySavings1203.pdf by M Dodd - Cited by 6 - Related articles of a VAV zone for each occupant include higher worker productivity and ... assigning one of several occupancy schedules to each occupant. ... energy but the designer must never forget that the primary purpose of HVAC is ... chances of overcooling or overheating which lowers fan speeds and lowers the central conditioning. Social and Behavioral Aspects of Energy use - Annual Review of ... www.annualreviews.org › ... › List of Issues › Volume 18, 1993 by L Lutzenhiser - 1993 - Cited by 615 - Related articles Social Influence, Consumer Behavior, and Low-Carbon Energy Transitions ... of asynchronous demand behavior on overcooling in multiple zone AC systems.
