HVAC High Voltage Alternating Current


Commissioning of HVAC systems in a campus building with regard to the indoor environment and energy performance
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Todays HVAC systems in the building sector become more and more complex in order to fulfill the increasing standard of the indoor environment, which typically have many components, sub-systems, and controls. Commissioning is a quality-oriented process to

Stage 3 Report-RP 1033 High Performance Commercial Building HVAC
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This report presents a summary of the findings and activities of Stage 3 of the LCL-CRC research project RP 1033 High Performance Commercial Building HVAC . This study utilised the knowledge gained form Stages 12 and examined the opportunities for further

Small Building HVAC Retrofit
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The goal of this project was to identify a small building on the University of California Davis campus, in collaboration with the Energy Conservation Office, most suitable for a state-of-the- art Heat Recovery Ventilator (HRV) unit. A full HVAC retrofit was assessed using the HRV

WI-FI ROUTER NETWORK-BASED OCCUPANCY ESTIMATION TO OPTIMIZE HVAC ENERGY CONSUMPTION
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More than half of the commercial building stock in the United States was built before 1980 prior to the increased focus on energy efficiency. In the current age of Smart and Green buildings, owners incorporating expensive sensor infrastructure to reduce building energy

Steady-State Analysis of HVAC Performance using Indoor Fans in Control Design
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Indoor fans are high-authority actuators in heating, ventilation, and air conditioning ( HVAC ) systems since they facilitate the transfer of heat between refrigerant and room air. In some variable refrigerant flow (VRF) systems, the indoor fan speeds are under the control of the

Air to Air Energy Recovery from HVAC Systems under Different Membrane Materials
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Membrane heat exchanger is one of the main components of green HVAC systems. Performance of a thin-membrane heat exchanger has been examined for different membrane materials. A computational fluid dynamics (CFD) approach was utilized to

Accuracy of HVAC Load Predictions: Validation of EnergyPlus and DOE-2: Using an Instrumented Test Facility
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Comparisons of predictions from EnergyPlus, DOE-2.1 e, and DOE-2.2 with measurements from Lawrence Berkeley National Laboratorys FLEXLAB test facility have been conducted with the aim of better understanding the accuracy of these engines. Differences between

HVDC over HVAC transmission system: fault conditions stability study
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Electric Faults can be defined as the flow of a massive current through an alternative path which leads to cause serious equipments damage, interruption of power, personal injury or death. High Voltage Alternating Current ( HVAC ) is the most effective and efficient way for

Development of a Digital PID-like Adaptive Controller and its Application in HVAC systems
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This paper presents the development of a digital Proportional Integral Derivative (PID)-like adaptive controller and its application on Heating, Ventilating and Air Conditioning ( HVAC ) systems. The HVAC process model is often approximately described as a first-order-plus

An Interactive Building Control for the Integrative HVAC System Featuring Personalized Cooling in Office Buildings.
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The effective HVAC operations not only achieve energy savings but also create a more comfortable indoor environment for occupants. Currently, commercial buildings, particularly open-plan office buildings are faced with problems like unnecessary energy waste and

Retro-commissioning a Performing Arts Center Using HVAC -Cx
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This report presents the use of a semi-automated commissioning tool for the energy retrocommissioning of the Performing Arts Center at Montgomery College in Rockville, Maryland. Researchers and field practitioners collaborated to implement the HVAC -Cx

EXPERIMENTAL STUDY ON THE INFLUENCE OF COOLING WATER TEMPERATURE AND NIGHT VENTILATION ON ENERGY EFFICIENCY THE HVAC
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The energy performance standards imposed on nZEB buildings require measures to reduce energy consumption. The article presents an experimental study demonstrating the reduction of energy consumption through the optimal control of the ventilation/air

Towards automated HVAC controls commissioning: Mechanisms to identify temperature and flow related functions of AHU components
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Commissioning (Cx) of heating, ventilating, air conditioning ( HVAC ) systems has emerged as an effective sustainable practice to ensure high performance of these systems during operation. According to a DOE report, HVAC systems used 62% of the energy consumed by

Validation of a TRNSYS model for a complex HVAC system installed in a low-energy building
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As the energy consumption in buildings sector is rapidly increasing, the need of concrete actions to be undertaken arises. An important measure with this respect is developing accurate models, used for analyzing strategies of energy intensity reduction. This paper

COST EFFECTIVE OPERATION OF HVAC SYSTEM UNDER THERMAL DISTURBANCE
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Varying cooling load requirements in HVAC system become a major concern to many consumers because of the additional cost of electricity. The cooling load variation of HVAC system usually occurs when the domestic house door is frequently kept open for prolonged

Cable links designing in HVAC and HVDC submarine power grids selected issues
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Submarine (offshore) HVAC and HVDC cable power grids are becoming more and more important. The establishment of submarine transmission interconnections between various national power systems and the development of offshore wind farms are main reasons for

Performance Evaluation of HVAC Systems via Coupled Simulation between Modelica and OpenFOAM
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High-performance building design heavily relies on computational models that can predict the dynamic interactions between HVAC equipment, air flow and building envelope. This paper presents a coupled simulation of Modelica and OpenFOAM to evaluate the system

Using of Fuzzy Logic in HVAC applications
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Abstract HVAC (Heating, Ventilating and Air Conditioning) applications aim to fulfill the appropriate thermal comfort conditions in a healthy manner. In HVAC systems the use of fuzzy logic seems interesting. In this investigation, the influence levels of temperature

Performance Evaluation of HVAC Systems via Coupled Simulation between Modelica and OpenFOAM
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High-performance building design heavily relies on computational models that can predict the dynamic interactions between HVAC equipment, air flow and building envelope. This paper presents a coupled simulation of Modelica and OpenFOAM to evaluate the system

Heating, ventilation, and air conditioning Heating, ventilation, and air conditioning (HVAC ) is the technology of indoor and vehicular environmental comfort. Its goal is to provide thermal comfort and acceptable indoor air quality. HVAC system design is a subdiscipline of mechanical engineering, based on the principles of thermodynamics, fluid mechanics and heat transfer. “Refrigeration” is sometimes added to the field’s abbreviation, as HVAC ventilation is dropped, as in HACR (as in the designation of HACR-rated circuit breakers). HVAC is an important part of residential structures such as single family homes, apartment buildings, hotels and senior living facilities, medium to large industrial and office buildings such as skyscrapers and hospitals, vehicles such as cars, trains, airplanes, ships and submarines, and in marine environments, where safe and healthy building conditions are regulated with respect to temperature and humidity, using fresh air from outdoors.




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