A rule-based, system-level fault detection and diagnostic (FDD) method for HVAC systems was developed. It functions as an interface between multiple, equipment-specific FDD tools and a human operator. The method resolves and prioritizes conflicting fault reports from equipment-specific FDD tools, performs FDD at the system level, and presents an integrated view of an HVAC system’s fault status ...

In this paper, we report a novel technique for inexpensive high-speed internet access in buildings. Our work shows that, one can use heating, ventilation, and air conditioning (HVAC) ducts for indoor wireless transmission systems and networks. Measurements and system calculations show that coverage distances in excess of 100 meters from the base station and data rates of up to 100 Mbps should b...

Neural Network Based Optimal Control of HVAC&R Systems Min Ning, Ph.D Concordia University, 2008 Heating, Ventilation, Air-Conditioning and Refrigeration (HVAC&R) systems have wide applications in providing a desired indoor environment for different types of buildings. It is well acknowledged that 30% 40% of the total energy generated is consumed by buildings and HVAC&R systems alone account fo...

In this thesis a component-based framework for the evaluation of HVAC performance in buildings is developed. Following the method of the demand development HVAC systems are evaluated by means of their energy effort during planing and maintenance. The evaluation is achieved through: determining the energy requirement and energy requirement's impacting factors using a building simulation determin...

A number of heating, ventilation and air-conditioning (HVAC) system vendors and operators have started to implement demand management systems in commercial buildings, yet we contend that the impact of such systems on building performance and occupant comfort is poorly understood. This paper examines such issues, showing the results from demand response experiments in two large office buildings....

Background and purpose: Vibration caused by ventilation systems in buildings is one of the harmful physical factors that can cause harm to residents. Therefore, measuring and controlling vibration is important. Materials and Methods:  In the first step of the study, the vibration accelerometer was placed on the base of a fan where the vibrations were sent toward the duct wall. A vibration asse...

We have sought to accurately quantify automobile HVAC air flow rates in four passenger vehicles, under a range of different ventilation settings and speeds. We used Sulphur Hexafluoride (SF6) as a tracer gas, coupled with a portable doser/sampler system to quantify flow rates and leakage. Results of this work indicate a linear increase in HVAC air flow rate with increasing vehicle speed for all...

Energy crisis, global warming and other environmental issues are what motivate researchers to find new strategies to reduce energy consumption in buildings. Recently, using phase change materials (PCM) in the building’s envelopes has drawn significant attention as an energy-saving method, which helps in increasing the building’s thermal capacity. In the present research, the effects of the main...

In a power system, having a high level of renewable energy penetration requires a large amount of ancillary services to balance the supply and demand in real time. Commercial buildings have significant thermal capacity and so offer large potential for providing such services. Recent research has shown that the power consumption of the Heating, Ventilation, and Air Conditioning (HVAC) system can...