نتایج جستجو برای: hvac operation mode
تعداد نتایج: 421993 فیلتر نتایج به سال:
Abstract: Heating, Ventilating and Air Conditioning (HVAC) system is a nonlinear MIMO system which is very difficult to control. This paper presents adaptive fuzzy output feedback control based on observer for nonlinear HVAC System whose state variables are not available. Fuzzy systems are employed to approximate the unknown nonlinear functions of the HVAC system and the state observer is desig...
Persistent monitoring of Indoor Air Quality (IAQ) within and around buildings and structures is critical to reduce risk of indoor health concerns. Specifically, IAQ issues in large integrated buildings may stem from inadequate ventilation and/or faults in the complex HVAC systems that together with control and communication systems can be considered as complex Cyber Physical Systems (CPSs). We ...
The IEEE 1588 precision time protocol (PTP) time-setting mode of operation can be used to dramatically improve the quality of time-based systems that rely on a physical layer syntonization source in addition to PTP. Based on the standardized PTP protocol and common network frequency distribution techniques, the PTP time-setting mode of operation is capable of distributing time over packet-based...
در این گزارش ابتدا سیستمهای hvac را مورد بررسی کلی قرار میدهیم. اجزای یک سیستم hvac را مورد تحلیل قرار داده، فرآیندهای موجود در این سیستمها را بیان کرده و ابزارهای موجود برای تحلیل فرآیندهای hvac را بررسی میکنیم. اما آنچه برای ما مهم است اصلاح و بهبود کنترل سیستم میباشد. به شکلی که در کنار کاهش مصرف انرژی و بهبود آسایش افراد در محیط، به الگوریتمی دستیابیم که بدون نیاز به نظارت و تغییر، تم...
We propose a block-cipher mode of operation, EAX, for solving the problem of authenticated-encryption with associated-data (AEAD). Given a nonce N , a message M , and a header H , our mode protects the privacy of M and the authenticity of bothM andH . StringsN ,M , andH are arbitrary bit strings, and the mode uses 2djM j=ne + djHj=ne + djN j=ne block-cipher calls when these strings are nonempty...
In this paper I propose a tweakable block cipher construction with a mode of operation that combines counter and chaining methods. Using a single key, the direct application of this mode produces unrepeatable message authentication tags.
An adaptive approach to control a cooling coil chilled water valve operation, called adaptive fuzzy logic control (AFLC), is developed and validated in this study. The AFLC calculates the error between the supply air temperature and supply air temperature set point for air in an air handling unit (AHU) of a heating, ventilating, and air conditioning (HVAC) system and determines optimal fuzzy lo...
Nowadays, the research and innovation of smart buildings has been gaining increasingly attentions in building construction and management society. Among a variety of emerging technologies, demand driven HVAC (i.e., heating, ventilation and air conditioning) operation is promising to significantly reduce the building operation cost, and ultimately to achieve sustainable smart buildings. The “Int...
While having the potential to significantly improve heating, ventilating and air conditioning (HVAC) system performance, advanced (e.g., optimal, robust and various forms of adaptive) controllers have yet to be incorporated into commercial systems. Controllers consisting of distributed proportional-integral (PI) control loops continue to dominate commercial HVAC systems. Investigation into adva...
due to the increasing development in various branches of the automotive industry, the need for a comfort climate in the cabin is more sensible. however, to achieve climate comfort, hvac system consumes a considerable amount of engine power. hence, improving hvac system performance leads to more energy saving of the vehicle which is a critical factor for nowadays automotive. besides, one crucial...
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