District Energy Enters the 21St Century

Total Page:16

File Type:pdf, Size:1020Kb

District Energy Enters the 21St Century TECHNICAL FEATURE This article was published in ASHRAE Journal, July 2015. Copyright 2015 ASHRAE. Posted at www.www.burnsmcd.com .org. This article may not be copied and/or distributed electronically or in paper form without permission of ASHRAE. For more information about ASHRAE Journal, visit www.ashrae.org. District Energy Enters The 21st Century BY STEVE TREDINNICK, P.E., MEMBER ASHRAE; DAVID WADE, P.E., LIFE MEMBER ASHRAE; GARY PHETTEPLACE, PH.D., P.E., MEMBER ASHRAE The concept of district energy is undergoing a resurgence in some parts of the United States and the world. Its roots in the U.S. date back to the 19th century and through the years many technological advancements and synergies have developed that help district energy efficiency. This article explores district energy and how ASHRAE has supported the industry over the years. District Energy’s Roots along with systems serving groups of institutional build- District energy systems supply heating and cooling ings, were initiated and prospered in the early decades to groups of buildings in the form of steam, hot water of the 1900s and by 1949 there were over 300 commercial or chilled water using a network of piping from one or systems in operation throughout the United States. Of more central energy plants. The concept has been used course, systems in the major cities of Europe also gained in the United States for more than 140 years with the favor in Paris, Copenhagen and Brussels. In many cases first recognized commercial district energy operation district steam systems were designed to accept waste originating in Lockport, N.Y. circa 1877. The Nov. 19, 1881, steam from urban electric production and became a reve- issue of Scientific American featured a front page story with nue center for growing electric utilities in the United States. illustrations describing the commercial venture in New After World War II, economic conditions changed in York City associated with production and distribution of the United States and steam district heating systems steam for building heating, motive power and cooking. lost favor for several reasons, including population The New York Steam Company installed a network of shifts to the suburbs, electric generation plants being pipes to distribute steam produced in boilers as well as constructed remotely from downtown areas, and rapid waste steam from electric production (Figure 1). growth of the natural gas distribution industry. Since The district heating concept grew in urban areas and was the electric side of the utility business seemed to have preferred where in-building boilers needing attendants unlimited growth potential, the steam district heating and fuel deliveries could be avoided. Commercial systems, business in many cases were neglected or abandoned. Steve Tredinnick, P.E., is senior project manager at Burns & McDonnell, Downers Grove, Ill. David Wade, P.E., is president of RDA Engineering Services, Atlanta, and is a member and past chair of TC 6.1, Steam and Hot Water Systems. Gary Phetteplace, Ph.D., P.E., is president of GWA Research, Lyme, N.H., and lead author of the ASHRAE District Heating Guide and District Cooling Guide. All authors are members and past chairs of TC 6.2, District Energy. Tredinnick is Handbook subcommittee chair of TC 6.2. 48 ASHRAE JOURNAL ashrae.org JULY 2015 TECHNICAL FEATURE Institutions where a profit motive was not dominant but FIGURE 1 November 19, 1881 Scientific American magazine cover showing steam pip- continued customer service was dominant continued ing installation in New York City. Image courtesy of David Wade, RDA Engineering operation and expansion of district systems, seeing clear life-cycle advantages. In Europe, a tradition of hot water district heating began early and was continued after World War II as part of major reconstruction efforts. European designers recognized the benefits of hot water distribution com- pared to steam with regard to lower heat loss, less main- tenance requirements and synergistic interface with combined heat and power (CHP). Other factors contrib- uting to widespread adoption in Europe are planned communities, lack of natural gas distribution, air quality concerns, and reduced reliance on imported fuels. District cooling, in the form of chilled water service, was first offered as a utility in Hartford, Conn., in 1963. The system was developed by the Connecticut Natural Gas Company as a way to use natural gas for air con- ditioning. Similar systems were developed within five years in Pittsburgh and Tulsa. Those systems continue operation through the present day. Interest in district energy systems in the United not a coherent U.S. energy policy to incentivize develop- States was renewed after the Energy Embargo of 1973 ment of district energy systems. when the U.S. Department of Energy (DOE) undertook Even the most efficient buildings require a grid to bal- a series of programs to evaluate community energy ance annual energy production and use. Many think of systems using district heating and cooling through the grid as only electricity; however, the possibilities for interface with power plants. DOE also explored the energy efficiency expand greatly when a district energy potential to provide low grade heat to large metropoli- thermal grid is available. tan areas from nuclear plants located nearby. This pro- European countries that are committed to reduction gram encouraged new hot water district heating sys- of greenhouse gases have made district energy systems a tems in St. Paul, Minn., Piqua, Ohio, and Jamestown, major component in their national energy strategies and N.Y. The program was terminated in the early 1980s, policies. They recognize that a thermal grid gives them and subsequent fuel price uncertainties reduced (but the most flexibility and energy independence when did not eliminate) interest in district heating and cool- integrating conventional fossil fuels, nuclear energy, ing as a commercial venture. biomass, wind, solar and geothermal energy. Many The reason district energy is not more widely used in systems there are base loaded with heat generated by the U.S. is largely institutional, rather than technical.1 municipal refuse incineration and waste heat recovery Most U.S. buildings are conceived, designed and con- from electric generation. Low temperature hot water structed by individuals who rarely consider the energy systems* can interface directly with heat from solar characteristics of surrounding buildings. U.S. codes and energy collectors or heat from heat pump systems. design protocols deal with energy use at a single build- ing, rather than on a community scale. Private utili- Concept of District Energy ties in the U.S. reinforce this approach through their District energy is not for everyone. It is a very tech- focused marketing of electric or natural gas service. nical and economic decision that requires a detailed Furthermore, unlike other places in the world, there is analysis (see 2012 ASHRAE Handbook—HVAC Systems and * Low temperature hot water district heating is defined as having a supply temperature equal to or lower than 250°F (121°C); however, it should be noted that many systems, especially in Europe, operate at much lower temperatures and often they also use seasonal temperature modulation, i.e., temperature reset based on outdoor temperature. JULY 2015 ashrae.org ASHRAE JOURNAL 49 TECHNICAL FEATURE Equipment, Chapter 12) looking at the alternatives in down the equipment for removal or installation. both a quantitative and qualitative manner. For most, Longer paybacks are palatable (government facilities, this decision is similar to whether one drives your car airports, college and universities, hospital campuses, etc.). or take public transportation to work. On public trans- Architectural features of a significant or historic portation, for example, one can work or sleep or stay building would be adversely affected by cooling towers productive in lieu of focusing your efforts on fighting or boiler stacks. traffic and driving yourself. On the other hand, using Conversely, district energy does not work well when your personal car, one can go from place to place at the buildings are too small or too far apart from one your own schedule and convenience, albeit at a prob- another (increasing distribution costs); have newer able higher cost. Of course, pros and cons exist for each highly efficient existing HVAC systems; or when the sys- method, and many factors affect your decision such as tem developer requires rapid payback on their invest- whether you live close to a bus or train line or not. ment. Many times several of the previously listed factors must occur for a project to germinate. Where to Apply District Energy District energy for heating or cooling works well as an Expected Benefits alternative to boilers and chillers in each building when As highlighted in ASHRAE’s District Cooling Guide2 and the the following factors are present. 2012 ASHRAE Handbook, when a net present value (NPV) High load-density facilities (i.e., short distances of analysis is conducted comparing the costs of connecting distribution piping can interconnect several buildings of to a district cooling system to constructing a building spe- reasonable size) such as airports; college and university cific cooling plant, the results are extremely competitive campuses; large hospital complexes; large office and and most times financially equivalent or superior. With industrial complexes/campuses; casinos; sports stadi- comparable,
Recommended publications
  • Consider Installing a Condensing Economizer, Energy Tips
    ADVANCED MANUFACTURING OFFICE Energy Tips: STEAM Steam Tip Sheet #26A Consider Installing a Condensing Economizer Suggested Actions The key to a successful waste heat recovery project is optimizing the use of the recovered energy. By installing a condensing economizer, companies can im- ■■ Determine your boiler capacity, prove overall heat recovery and steam system efficiency by up to 10%. Many average steam production, boiler applications can benefit from this additional heat recovery, such as district combustion efficiency, stack gas heating systems, wallboard production facilities, greenhouses, food processing temperature, annual hours of plants, pulp and paper mills, textile plants, and hospitals. Condensing economiz- operation, and annual fuel ers require site-specific engineering and design, and a thorough understanding of consumption. the effect they will have on the existing steam system and water chemistry. ■■ Identify in-plant uses for heated Use this tip sheet and its companion, Considerations When Selecting a water, such as boiler makeup Condensing Economizer, to learn about these efficiency improvements. water heating, preheating, or A conventional feedwater economizer reduces steam boiler fuel requirements domestic hot water or process by transferring heat from the flue gas to the boiler feedwater. For natural gas-fired water heating requirements. boilers, the lowest temperature to which flue gas can be cooled is about 250°F ■■ Determine the thermal to prevent condensation and possible stack or stack liner corrosion. requirements that can be met The condensing economizer improves waste heat recovery by cooling the flue through installation of a gas below its dew point, which is about 135°F for products of combustion of condensing economizer.
    [Show full text]
  • Overview of Chiller Compressors
    Overview of Chiller Compressors Course No: M04-027 Credit: 4 PDH A. Bhatia Continuing Education and Development, Inc. 22 Stonewall Court Woodcliff Lake, NJ 07677 P: (877) 322-5800 [email protected] OVERVIEW OF CHILLER COMPRESSORS Overview In HVAC industry, the refrigeration machine that produces chilled water is referred to as a “Chiller”. A chiller package operates either on the principles of vapor compression or vapor absorption. The vapor compression system uses mechanical energy in the form of electric motor to drive the cooling cycle whereas absorption chillers use heat to drive the process. The vapor compression chiller system, which is far more prominent in commercial buildings, consists of four major components: the compressor, evaporator, condenser and expansion device all packaged as a single unit. The classification of vapor compression chiller packages is generally by the type of compressor: centrifugal, reciprocating, and screw being the major ones. Chillers are the largest consumer of energy in a commercial building and it is therefore important to understand the relative benefits and limitations of various types in order to make the right economic decisions in chiller installation and operation. This course will talk about the type of compressor used in the water cooled chiller. The course is divided into 3 parts: Part - I: Types of Chiller Compressors Part – II: Comparison of Chiller Compressors Part –III: Economic Evaluation of Chiller Systems PART I - TYPES OF CHILLER COMPRESSORS Most cooling systems, from residential air conditioners to large commercial and industrial chillers, employ the refrigeration process known as the vapor compression cycle. At the heart of the vapor compression cycle is the mechanical compressor.
    [Show full text]
  • District Heating System, Which Is More Efficient Than
    Supported by ECOHEATCOOL Work package 3 Guidelines for assessing the efficiency of district heating and district cooling systems This report is published by Euroheat & Power whose aim is to inform about district heating and cooling as efficient and environmentally benign energy solutions that make use of resources that otherwise would be wasted, delivering reliable and comfortable heating and cooling in return. The present guidelines have been developed with a view to benchmarking individual systems and enabling comparison with alternative heating/cooling options. This report is the report of Ecoheatcool Work Package 3 The project is co-financed by EU Intelligent Energy Europe Programme. The project time schedule is January 2005-December 2006. The sole responsibility for the content of this report lies with the authors. It does not necessarily reflect the opinion of the European Communities. The European Commission is not responsible for any use that may be made of the information contained therein. Up-to-date information about Euroheat & Power can be found on the internet at www.euroheat.org More information on Ecoheatcool project is available at www.ecoheatcool.org © Ecoheatcool and Euroheat & Power 2005-2006 Euroheat & Power Avenue de Tervuren 300, 1150 Brussels Belgium Tel. +32 (0)2 740 21 10 Fax. +32 (0)2 740 21 19 Produced in the European Union ECOHEATCOOL The ECOHEATCOOL project structure Target area of EU28 + EFTA3 for heating and cooling Information resources: Output: IEA EB & ES Database Heating and cooling Housing statistics
    [Show full text]
  • Technical Challenges and Innovative Solutions for Integrating Solar Thermal Into District Heating
    Solar Energy Systems GmbH Technical challenges and innovative solutions for integrating solar thermal into district heating P. Reiter SOLID Solar Energy Systems GmbH 06.12.2019 Solar Energy Systems GmbH Solar Heat and DH Solar Cooling Solare Process Heat 26 YEARS EXPERIENCE IN LARGE-SCALE SOLAR THERMAL 300 SYSTEMS BUILT IN MORE THAN 20 COUNTRIES OFFICES IN THE USA, SINGAPORE, GERMANY Energy used by sector: heat - mobility - electricity Solar Energy Systems GmbH Renewable Energy in Total Final Energy Consumption, by Sector, 2016; Source: REN21 Global Status Report 2019 Current supply of DH worldwide Solar Energy Systems GmbH Werner (2017), https://doi.org/10.1016/j.energy.2017.04.045 Energy mix of the future Solar Energy Systems GmbH Limited renewable electricity More wind needed to cover Seasonal current electricity demand mismatch Limited availability Recycling reduces energy from waste Industry tries Operation based on to reduce Limited electricity needs => waste heat availability does not match heat profile Differences between basic SDH and BigSolar Solar Energy Systems GmbH Basic solar district heating (SDH) for covering DHW demand Current SDH systems for covering summer DHW demand Solar Energy Systems GmbH AEVG/Fernheizwerk, Graz, AT Collector field test under real conditions! 10 collector types from 7different manufacturers: • HT-flat plate collectors (foil/double glass) Commiss Collector Nominal Solar CO2- ioning surface power yield savings • Vacuum-tube collectors area Heat • Concentrating collector 2007 8,215 m² 5.7 MW ca. 3,000 1,400 t / 2014-18 MWh/a year Differences between basic SDH and BigSolar Solar Energy Systems GmbH Solar district heating including seasonal storage (BigSolar) Scenario 2 The BigSolar concept Solar Energy Systems GmbH CITYCITY Boiler Boiler Potentials with high solar coverage ratios Solar Energy Systems GmbH SDH for DHW in summer BigSolar (incl.
    [Show full text]
  • Fifth-Generation District Heating and Cooling Substations: Demand Response with Artificial Neural Network-Based Model Predictive Control
    energies Article Fifth-Generation District Heating and Cooling Substations: Demand Response with Artificial Neural Network-Based Model Predictive Control Simone Buffa 1,*, Anton Soppelsa 1 , Mauro Pipiciello 1, Gregor Henze 2,3,4 and Roberto Fedrizzi 1 1 Eurac Research, Institute for Renewable Energy, Viale Druso 1, 39100 Bolzano, Italy; [email protected] (A.S.); [email protected] (M.P.); [email protected] (R.F.) 2 Department of Civil, Environmental and Architectural Engineering, University of Colorado Boulder, Boulder, CO 80309-0428, USA; [email protected] 3 National Renewable Energy Laboratory, Golden, CO 80401, USA 4 Renewable and Sustainable Energy Institute, Boulder, CO 80309, USA * Correspondence: simone.buff[email protected]; Tel.: +39-0471-055636 Received: 16 July 2020; Accepted: 11 August 2020; Published: 21 August 2020 Abstract: District heating and cooling (DHC) is considered one of the most sustainable technologies to meet the heating and cooling demands of buildings in urban areas. The fifth-generation district heating and cooling (5GDHC) concept, often referred to as ambient loops, is a novel solution emerging in Europe and has become a widely discussed topic in current energy system research. 5GDHC systems operate at a temperature close to the ground and include electrically driven heat pumps and associated thermal energy storage in a building-sited energy transfer station (ETS) to satisfy user comfort. This work presents new strategies for improving the operation of these energy transfer stations by means of a model predictive control (MPC) method based on recurrent artificial neural networks. The results show that, under simple time-of-use utility rates, the advanced controller outperforms a rule-based controller for smart charging of the domestic hot water (DHW) thermal energy storage under specific boundary conditions.
    [Show full text]
  • 4. Hvac and Refrigeration System
    4. HVAC AND REFRIGERATION SYSTEM Syllabus HVAC and Refrigeration System: Vapor compression refrigeration cycle, Refrigerants, Coefficient of performance, Capacity, Factors affecting Refrigeration and Air conditioning system performance and savings opportunities. Vapor absorption refrigeration system: Working principle, Types and comparison with vapor compression system, Saving potential 4.1 Introduction The Heating, Ventilation and Air Conditioning (HVAC) and refrigeration system transfers the heat energy from or to the products, or building environment. Energy in form of electricity or heat is used to power mechanical equipment designed to transfer heat from a colder, low-ener- gy level to a warmer, high-energy level. Refrigeration deals with the transfer of heat from a low temperature level at the heat source to a high temperature level at the heat sink by using a low boiling refrigerant. There are several heat transfer loops in refrigeration system as described below: Figure 4.1 Heat Transfer Loops In Refrigeration System In the Figure 4.1, thermal energy moves from left to right as it is extracted from the space and expelled into the outdoors through five loops of heat transfer: – Indoor air loop. In the leftmost loop, indoor air is driven by the supply air fan through a cool- ing coil, where it transfers its heat to chilled water. The cool air then cools the building space. – Chilled water loop. Driven by the chilled water pump, water returns from the cooling coil to the chiller’s evaporator to be re-cooled. – Refrigerant loop. Using a phase-change refrigerant, the chiller’s compressor pumps heat from the chilled water to the condenser water.
    [Show full text]
  • Performance Prediction of a Solar District Cooling System in Riyadh, Saudi T Arabia – a Case Study ⁎ G
    Energy Conversion and Management 166 (2018) 372–384 Contents lists available at ScienceDirect Energy Conversion and Management journal homepage: www.elsevier.com/locate/enconman Performance prediction of a solar district cooling system in Riyadh, Saudi T Arabia – A case study ⁎ G. Franchini , G. Brumana, A. Perdichizzi Department of Engineering and Applied Sciences, University of Bergamo, 5 Marconi Street, Dalmine 24044, Italy ARTICLE INFO ABSTRACT Keywords: The present paper aims to evaluate the performance of a solar district cooling system in typical Middle East Solar cooling climate conditions. A centralized cooling station is supposed to distribute chilled water for a residential com- District cooling pound through a piping network. Two different solar cooling technologies are compared: two-stage lithium- Parabolic trough bromide absorption chiller (2sABS) driven by Parabolic Trough Collectors (PTCs) vs. single-stage lithium-bro- Absorption chiller mide absorption chiller (1sABS) fed by Evacuated Tube Collectors (ETCs). A computer code has been developed Thermal storage in Trnsys® (the transient simulation software developed by the University of Wisconsin) to simulate on hourly basis the annual operation of the solar cooling system, including building thermal load calculation, thermal losses in pipes and control strategy of the energy storage. A solar fraction of 70% was considered to size the solar field aperture area and the chiller capacity, within a multi-variable optimization process. An auxiliary com- pression chiller is supposed to cover the peak loads and to be used as backup unit. The two different solar cooling plants exhibit strongly different performance. For each plant configuration, the model determined the optimal size of every component leading to the primary cost minimization.
    [Show full text]
  • Submission to the DCCAE's Consultation “Ireland's Draft
    Submission to the DCCAE’s Consultation “Ireland’s Draft National Energy and Climate Plan (NECP) 2021-2030” Submission prepared by the Irish District Energy Association February 2019 www.districtenergy.ie [email protected] Submission to ‘Draft NECP’ Consultation from DCCAE: February 2019 Contents Contents ........................................................................................................................................................ 2 1 Introduction .......................................................................................................................................... 3 2 IrDEA welcomes the support for District Heating in the responses to the Initial NECP Consultation .. 3 3 The Potential for District Heating is much higher than proposed in the NECP .................................... 4 4 District Heating is a key enabler of Renewable Heat ............................................................................ 5 4.1 Excess Heat Should be Considered along with Renewable Heat as it also offsets carbon emitting fuels such as oil and gas ............................................................................................................................ 8 5 The Flexibility of District Heating Should be valued under Energy Security ......................................... 9 6 Increasing Renewable Heat will require stronger signals and/or support ......................................... 12 7 Bioenergy should be prioritised where it adds most value ...............................................................
    [Show full text]
  • How Does a Recirculating Chiller Do Heating?
    How does a Recirculating Chiller do Heating? Mitchell Howard, Technical Manager March 2019 © Applied Thermal Control 2019 What is this guide for? To explain how ATC’s chillers can heat as well as cool. • Heat of compression adds energy to refrigerant • Act of compression itself causes temperature to rise. • Electrical energy input to compressor enters refrigerant through conduction as refrigerant circulates. • Hot Gas Bypass (HGB) capacity control • Instead of allowing hot gaseous refrigerant to pass into the condenser to do conventional refrigeration, it is redirected into the evaporator via a discharge bypass valve (DBV or HGBV). 2 © Applied Thermal Control 2019 Reverse-Carnot Cycle Thermodynamic model used when chiller cools. 6 5 4 7 1. Compressor suction port draws refrigerant in. 2. Compression increases pressure and heat. 3. Sensible cooling begins at the condenser. 4. Sensible cooling completed; state change starts. 3 5. State change in condenser –constant temp and pressure 6. Latent cooling completed; further sensible cooling to point 7 ensures liquid supply. This is subcooling. 7. Expansion process begins at the inlet to TEV. 8 2 8. Expansion is achieved by reducing pressure through a Pressure tiny orifice. Low pressure and temperature seen at outlet. 9. Inlet to evaporator provided with refrigerant already going 9 1 through state change. 10. Boiling (evaporation) process continues in the evaporator. 11. Liquid cannot be compressed; additional sensible heating 10 11 applied before gaseous refrigerant can enter compressor. This is known as superheat. Heat Content (Enthalpy) (Energy per unit Mass) 3 © Applied Thermal Control 2019 Why does a compressor heat? Due to isentropic compression and electric motor inefficiency.
    [Show full text]
  • A Little About Limits…
    FOREST-Handbook, chapter 03-00 1 District heating – Introduction 03-00: Introduction to small-scale district heating… As a “small” district heating network, one would consider anything with a peak thermal power less than about 5-10 MW, but there is no strict limit. The fundamental idea with district heating is simple enough, as shown by the schematic below: Thus, the system consists basically of three serial circuits, a boiler circuit, a distribution circuit and a customer circuit. In practice, there will be two customer circuits – one for the tap water and one for the comfort heating system water. These will be manifest as two separate coils in the customer heat exchanger but for simplicity only one is included in the schematic. The main components and their roles The boiler-end heat exchanger Looking at the schematic above it is obvious that the district heating system contains two heat exchangers – one at the boiler end and one with the customer. From a purely theoretical point of view, it might seem wise to exclude the boiler-end heat exchanger and to use the boiler circuit water also for the distribution, but this is not recommended for two reasons: 1) The part in the system most exposed to and most vulnerable to leakages is the distribution network, which may well extent for several kilometres across the township. In case of a major leakage – and if the boiler water is also the circulating water – the boiler will be dry and may suffer severe damage. Hence, the heat exchanger protects the boiler. 2) For maximum efficiency in the system as a whole it is important that the return water in the distribution system is as cold as possible – preferably below 50 oC.
    [Show full text]
  • District Cooling Systems
    DEPARTMENT OF TECHNOLOGY AND BUILT ENVIRONMENT TECHNOLOGICAL AND ECONOMIC EVALUATION OF DISTRICT COOLING WITH ABSORPTION COOLING SYSTEMS IN GÄVLE (SWEDEN) Elixabet Sarasketa Zabala June 2009 Master’s Thesis in Energy Systems uuir Master Programme in Energy Systems Examiner: Ulf Larsson Supervisor: Åke Björnwall Preface This investigation, as final Thesis Project of Master in Energy Systems (University of Gävle), was started to carry out in February, in collaboration with the company Gävle Energi AB. Many people have been involved answering my questions, providing me with information and so forth; some of those are mentioned below. First of all, I would like to thank Åke Björnwall, my supervisor at Gävle Energi AB, very much for his attention, help and support. His knowledge, comments, guidance and advices have been essential for the development of my work. Needless to say that I have learnt a lot from him. Secondly, I would like to thank the rest of workers at Gävle Energi AB, who have done everything they can to help me, in addition to make pleasant my stay in the company. I would also like to thank Ulf Larsson at the University of Gävle for his help. Furthermore, I am very grateful for all information I have received from other companies. Finally, I do not forget the invaluable support of my mother, Rosa, during all my studies. No one mentioned, no one forgotten. Gävle, June 2009 Elixabet Sarasketa Zabala Abstract Gävle Energi AB is a company which produces electricity as well as heat that is delivered through a district heating network in the municipality of Gävle.
    [Show full text]
  • AAON Chiller Controls
    www.AAON.com CHILLER CONTROLS The AAON Chiller Controllers are designed to maximize the capabilities of the AAON LF, LN, and LZ Series premium performance chiller products. These chiller controls are designed, engineered, and supported by AAON. Benefits • Sequences Fully Tested to Ensure High Performance Operation • Part of the Orion Controls System, compatible with AAON VCCX2 Rooftop Unit Controller • Prism 2 Software Interface for setup and configuration • LCD Displays on the Main Chiller Controller and Associated Modules for Status and Diagnostics • Factory Installed Touch Screen PC Interface is Available for Large Chiller Systems • BTL Certified BACnet MS/TP Interface AAON DESIGNED, ENGINEERED AND SUPPORTED CHILLER CONTROLS CHILLER CONTROLLER FEATURES The AAON Controllers can control chillers and outdoor mechanical rooms with pumping packages, waterside economizers, boilers, and vestibule conditioning. Each Chiller Main Controller and associated Modules have an LCD display for Status and Diagnostics, works with Prism 2 Software for full setpoint and configuration, and is BTL BACnet MS/TP certified. INCLUDED ON AAON EQUIPMENT LF SERIES CHILLER º LF Chiller Controls used with On/Off and Variable Capacity Scroll Compressor Systems LF CHILLER CONTROLLER º DX Barrel Chiller Controls used with VFD Controlled Compressor Systems LF CHILLER CONTROLLER LN SERIES CHILLER º DX Barrel Chiller Controls used with STANDARD FEATURES VFD Controlled Compressor Systems º Controls 1 or 2 Circuit DX Chillers LZ SERIES CHILLER - Single or Tandem Compressors
    [Show full text]