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Your search keyword '"AIR conditioning control"' showing total 10 results
Start Over Descriptor "AIR conditioning control" Topic heating & ventilation industry
10 results on '"AIR conditioning control"'

1. A Two-Way Direct Control of Central Air-Conditioning Load Via the Internet.

Author

Leehter Yao and Hau-Ren Lu

Subjects
*MATHEMATICAL optimization, *AIR conditioning control, *LINEAR programming, *GATEWAYS (Computer networks), *INTERNET, *HEATING & ventilation industry
Abstract

Abstract-A novel real-time optimization approach for two-way direct load control (TWDLC) of central air-conditioning chillers is proposed. For TWDLC, the main computer in the control center constantly monitors the average controllable load of every customer. For real-time calculations, a computationally fast and effective approach based on linear programming is proposed to determine the shedding ratio of every customer. The proposed optimization approach will minimize the difference between the load required to shed and the load actually shed at each sampling interval. Every customer's contribution to the load shedding is also leveled by the proposed approach. A gateway is installed at every customer's site to coordinate shedding control with the main computer through the Internet. As soon as the gateway receives the expected shedding ratio, it calculates the load required to shed and coordinates all chiller units in operation to conduct load shedding, thereby achieving the load reduction amount. [ABSTRACT FROM AUTHOR]

Published
2009
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2. Energy saving and improved comfort by increased air movement

Author

Schiavon, Stefano and Melikov, Arsen K.

Subjects
*ENERGY conservation, *COMPUTER software, *AIR speed, *COMPUTER simulation, *AIR conditioning control, *TEMPERATURE control, *VENTILATION, *AERODYNAMICS of buildings, *HEATING & ventilation industry
Abstract

Abstract: In this study, the potential saving of cooling energy by elevated air speed which can offset the impact of increased room air temperature on occupants’ comfort, as recommended in the present standards (ASHRAE 55 2004, ISO 7730 2005 and EN 15251 2007), was quantified by means of simulations with EnergyPlus software. Fifty-four cases covering six cities (Helsinki, Berlin, Bordeaux, Rome, Jerusalem and Athens), three indoor environment categories I, II and III (according to standard EN 15251 2007) and three air velocities (<0.2, 0.5 and 0.8m/s) were simulated. The required cooling/heating energy was calculated assuming a perfectly efficient HVAC system. A cooling energy saving between 17 and 48% and a reduction of the maximum cooling power in the range 10–28% has been obtained. The results reveal that the required power input of the fan is a critical factor for achieving energy saving at elevated room temperature. Under the assumptions of this study, the energy saving may not be achieved with the methods for air speed increase, such as ceiling, standing, tower and desk fans widely used today when the power consumption of the fan is higher than 20W. [Copyright &y& Elsevier]

Published
2008
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3. Properly Diagnosing the Need for a System Evacuation: The NEWS' Trainer Panel looks at the situations surrounding an HVAC system evacuation.

Author

KOSTORA, NICK

Subjects
HEATING & ventilation industry, GAGES, AIR conditioning control, CONFERENCES & conventions
Abstract

The article discusses the NEWS' Trainers Panel on heating, ventilation, and air conditioning (HVAC) system evacuation. Topics discussed include comments from Dennis Silvestri of MRS Educational Training on removal of air and moisture from the system, Nicholas Griewahn of Northern Michigan University on importance of the length of time required for evacuation and David Richardson of National Comfort Institute on micron gauge.

Published
2017

4. Best of Extra Edition.

Subjects
DIGITAL control systems, THERMOSTATIC expansion valves, HEATING control, AIR conditioning control, HEATING & ventilation industry
Abstract

A review of articles, including "How a DDC System Operates," "Variable Air Volume Systems," and "Servicing Thermostatic Expansion Valves" at achrnews.com, is presented.

Published
2017

5. Critical Cooling & Controls.

Author

Beverly, Robert

Subjects
*AIR conditioning industry, *AIR conditioning control, *HEATING & ventilation industry, *CONFERENCES & conventions
Abstract

The article offers information on the Critical Cooling & Controls education session to be held at the Air-Conditioning, Heating, Refrigerating (AHR) Expo in the Orange County Convention Center in California in January 2016.

Published
2015

6. Impact Of ASHRAE 90.1 On Controls And BAS Design.

Author

Ehrlich, Paul

Subjects
*ASHRAE standards, *ANSI standards, *HEATING & ventilation industry, *AUTOMATION in office buildings, *AUTOMATIC control of heating equipment, *VENTILATION equipment, *AIR conditioning control, *DETECTORS
Abstract

The article discusses the effects of a version of ASHRAE/ANSI 90.1 standard on heating, ventilation and air conditioning (HVAC) control and building automation system (BAS) design. The changes required in the 2010 and 2013 versions of 90.1 are discussed including the use of optimization strategies, demand controlled ventilation and energy recovery, and daylight harvesting. Other requirements include submetering, automatic control of plug loads, and occupancy sensors.

Published
2014

7. Evalving approaches to commissioning.

Subjects
HEATING & ventilation industry, AIR conditioning equipment, AIR conditioning control, HYDRONICS
Abstract

The article reports on a new remote commissioning idea for fan coil and chilled water systems of air-conditioning systems. Martin Lowe of Marflow Hydronics says that the specifier and installer have full control of the installation set-up from start to finish. Lowe also says that the method sets up a new single station balancing (SSB) system and does away with the old method of proportional balancing.

Published
2008

8. R-410A A/C Capacity Control.

Subjects
AIR conditioning control, TEMPERATURE control equipment, TEMPERATURE control equipment industry, HEATING & ventilation industry
Abstract

The article evaluates the APR-410 air conditioning control unit from Rawal Devices Inc. and offers information on its key features, specifications and benefits and advantages of using the product.

Published
2006

9. While At The Site, Provide Some Tips.

Author

Skaer, Mark

Subjects
REFRIGERATION & refrigerating machinery, HEATING & ventilation industry, AIR conditioning control, THERMOSTAT, MAINTAINABILITY (Engineering)
Abstract

Shares insights on the repair and maintenance of residential air conditioning systems. Services offered by the heating and ventilation industry; Concept of providing a helpful cooling season tips to the homeowners; Advantages of the energy savings associated with using a programmable thermostat.

Published
2004

10. Lennox Introduces Software For Rooftops.

Subjects
COMPUTER software, COMPUTER systems, COMPUTER software industry, AIR conditioning control, HEATING & ventilation industry
Abstract

Introduces the version 2.0 of the Sectra Configurator software package by Lennox Industries Inc. Distinct features; System applications; Specifications; Description.

Published
2004

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