DDC System Controls Sensitive Hospital Environment - Facility Management HVAC Feature. By Chris Matt, Managing Editor - Print & E-Media - June 2009 - HVAC StumbleUpon direct digital control, ddc, energy efficiency, iaq, hvac, humidification Hospitals have energy requirements unlike any other commercial or institutional facility, due to indoor air quality (IAQ) demands and expanding equipment needs.
So closely monitoring the different spaces and environments is important for efficient and streamlined operations. Health care facilities have to deal with infectious diseases in emergency rooms and inpatient areas, requiring high ventilation rates to mitigate the spread of those diseases. “Dehumidification is another large energy consumer for us,” Zanghi says. Instead of having to walk throughout the hospital to assess temperature and humidity levels, technicians use the DDC system.
“Everything was pneumatic prior to our conversion to DDC,” says Don Lewis, an HVAC technician with the hospital. Says Zanghi, “We certainly do feel good about our energy efficiency. Comments. Understanding Building Automation and Control Systems -KMC Controls. Understanding Building Automation and Control Systems Building Automation Systems (BAS) are centralized, interlinked, networks of hardware and software, which monitor and control the environment in commercial, industrial, and institutional facilities.
While managing various building systems, the automation system ensures the operational performance of the facility as well as the comfort and safety of building occupants. Typically, such control systems are installed in new buildings or as part of a renovation where they replace an outdated control system. Related Terms You may hear any of the following terms to describe the control or automation of buildings: What is Controlled? Generally, building automation begins with control of mechanical, electrical, and plumbing (MEP) systems. ChillersBoilersAir Handling Units (AHUs)Roof-top Units (RTUs)Fan Coil Units (FCUs)Heat Pump Units (HPUs)Variable Air Volume boxes (VAVs) Types of Building Automation and Control Systems What Does a BAS Look Like?
Understanding Building Automation and Control Systems -KMC Controls. Article - It is Time to Upgrade your DDC System. Our industry's Direct Digital Control (DDC) systems, some of which are up to 20 years old, have performed extremely well with great reliability, and have reduced control maintenance to the point that it has almost been eliminated. This has been of great benefit to Building Owners. Highly functional interfaces are presently available that seamlessly connect these existing DDC systems to most vendors' latest and greatest graphical web based operating systems.
This may fly in the face of the old adage "If it ain't broke don't fix it". However, the ease of, and the relative low cost to completely change the personality including the touch and feel of the existing DDC systems, while greatly increasing the overall functionality is starting to tempt system owners. These benefits make upgrading extremely compelling. The CABA Technology Roadmap for Intelligent Buildings mentioned in last month's column has a section on Lifespan Issues, which is copied below.
[Click Banner To Learn More] 智慧化產品資訊平台. 950718%E7%A9%BA%E8%AA%BF%E5%8F%8A%E9%9B%BB%E5%8A%9B%E9%81%A0%E7%AB%AF%E7%9B%A3%E6%8E%A7%E7%B3%BB%E7%B5%B1%E6%8A%80%E8%A1%93%E6%89%8B%E5%86%8A. 空調DDC系統與PLC系統. Chapter_6. DDC-Online. Purpose of this Guide: The purpose of this guide is to describe, in generic terms, the various architectures, hardware components and software associated with Direct Digital Control (DDC) systems. To accomplish this goal, a generic framework of the various components and configurations used in current DDC systems has been defined. This framework is used as a yardstick for several DDC manufacturers so readers may compare the relative features and benefits.
Intended Audience Due to the complexity and proprietary nature of DDC systems, it has become difficult to stay current with the designs, installations, operation and maintenance of DDC systems. This guide was developed specifically to help building owners and consulting/specifying engineers with these issues. What is an Energy Management System? For the purposes of this guide, an energy management system (EMS) is defined as a fully functional control system. What is Control? The process of controlling an HVAC system involves three steps. USC_BAS_DDC_0808. Direct digital control. Direct digital control (DDC) is the automated control of a condition or process by a digital device (computer).[1][2] A very early example of a DDC system meeting the above requirements was completed by the Australian business Midac in 1981-1982 using R-Tec Australian designed hardware.
The system installed at the University of Melbourne used a serial communications network, connecting campus buildings back to a control room "front end" system in the basement of the Old Geology building. Each remote or Satellite Intelligence Unit (SIU) ran 2 Z80 microprocessors whilst the front end ran 11 in a Parallel Processing configuration with paged common memory. The z80 microprocessors shared the load by passing tasks to each other via the common memory and the communications network.
Overview[edit] Central controllers and most terminal unit controllers are programmable, meaning the direct digital control program code may be customized for the intended use. Data communication[edit] In HVAC[edit]