DIGITAL HOT WATER SOLUTIONS
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1 DIGITAL HOT WATER SOLUTIONS
2 ARMSTRONG IS A TRUSTED GLOBAL LEADER IN INSTANTANEOUS HOT WATER GENERATION, DISTRIBUTION AND PRECISION TEMPERATURE CONTROL With in-depth knowledge and experience that spans more than a century, Armstrong understands your hot water system dynamic in ways no one else can. DUTY OF CARE Any building that is used by people other than the owner, the owner or manager has a legal responsibility placed upon them to ensure that others can use the building safely. Additionally, Building Services professionals have a Duty of Care to ensure that hot water generation and distribution systems are designed, installed, serviced and expertly maintained so that risks from scalding or bacterial infection are reduced and kept to an absolute minimum. Despite this a significant number of building occupants are still injured or die every year because of these risks. Example : In August 2012, a tourist staying in an Edinburgh hotel (Scotland) was severely scalded whilst showering and died later in hospital after 6 weeks in intensive care. The hotel operator was recently forced to pay a six figure compensation to the family of the victim. Chart 1 - Length of time for hot water to cause 3rd degree burns Temperature ( C) Time (adult) Time (child under 5) 38 cool bath average bath 39 average bath warm bath minutes 4.5 minutes 52 2 minutes 1 minute seconds 10 seconds seconds 4 seconds 58 5 seconds 1 second seconds 0.5 second MANAGING THE RISK The major risks related to the provision of hot water in a building are the risk to users of scalding from too hot water and Legionnaires Disease. Both problems are linked as one directly affects the other. The usual method for controlling Legionnaires Disease is to keep water hot. However, increasing hot water temperatures to kill bacteria brings an increased risk of scalding, which must also be controlled. You can see from the chart 1 and figure 1, that risk can be readily managed by ensuring the hot water delivered to bathrooms is no higher than 52 C. At this temperature Legionella bacteria cannot multiply, and will die over time, and a serious scald, even for a child, will take a submersion time of minutes rather than seconds to occur Figure 1 - Effect of temperature on bacteria growth Instant death of bacteria Death of 90% of bacteria within 2 minutes Death of 90% of bacteria within 2 hours Optimum temperature for growth of bacteria C 0 Bacteria survive inactive C
3 LEGIONELLA GUIDELINE COMPLIANCE There are a number of codes of practice and applicable guidelines for the control of Legionella, often with similar advice - that hot water should be stored at a temperature of at least 60 C and distributed at a minimum of 50 C. Examples of applicable guidelines: ASHRAE Guideline ASHRAE Standard Legionellosis : Risk Management for Building Water Systems UK Health & Safety Executive HSG274 Part 2 : The Control of Legionella Bacteria in Hot and Cold Water Systems US Dept. of Labor OSHA Technical Manual, Section III, Chapter 7, Legionnaires Disease As explained in HSG274 the risk of scalding at 50 C is low for most people so point of use thermostatic mixing valves, after an appropriate risk assessment, can be safely removed, if circulating the hot water at this temperature. For Elderly Care Homes and Healthcare facilities, it is recommended that the temperature out of the fixtures should be further reduced to 43/46 C, depending on the type of fixture. Armstrong understands the Legionella Guidelines, and how to apply them, and we have the hardware to keep your hot water system compliant and the monitoring and recording software to prove it. In the right conditions a few Legionella bacteria can grow from a few cells to a colony of millions within 8-10 days. YOUR ADVANTAGE The ability to, very accurately, deliver tempered water at 52 C to the entire hot water network greatly reduces the risk of scalding from every fixture. This can remove the requirement for thermostatic mixing valves (TMV s). Eliminating TMV s from bathrooms reduces room entry necessary for maintenance, which, in the case of hotels can cause revenue loss, or in hospitals increase risk of bringing dirt and bacteria into the medical space. Even if the decision is to use a TMV s, by limiting the hot water temperature to the fixture, increased safety is guaranteed in the event of a TMV failure. The advantage, to the owner, of eliminating or reducing the number of TMV s in the building, is that the cost of installing the hot water system is greatly reduced - often by around 50%. Circulating the hot water around the building at 52 C, rather than 60 C, saves energy - by reducing the heat losses in the hot water loop and thus the cooling load on the building. ALL ADVANTAGES PROVIDED WITH THE INSTALLATION OF THE ARMSTRONG BRAIN DIGITAL RECIRCULATING VALVE!
4 THE BRAIN DIGITAL RECIRCULATING VALVE (DRV) Armstrong introduced digital water temperature control to the world with The Brain Digital Recirculating Valve (DRV). Engineered exclusively for recirculating hot water systems, The Brain simplifies your hot water system to deliver unparalleled accuracy, stability and safety. It offers programmable temperature alerts and a program to promote compliance with recommended Legionella guidelines.. FEATURES Designed specifically to be the primary water temperature controller in a continuously pumped circulating hot water system in a commercial building. Digital technology provides enhanced water temperature control accuracy regardless of whether a circulating system is simply idling or maximum draw-off is taking place. Performance +/- 1 C control 0.5 C minimum system temperature loss Smarts Component self-diagnostics Programmable set point & alerts Programmable Thermal disinfection Safety Over temperature shutoff Power failure shutoff Emergency mode Global Acceptance Marriott International has selected The Brain as its corporate standard domestic hot water temperature control device for all new hotels. Connectivity Integral Modbus RTU interface (The Brain ) SAGE - Building System interface module - Web Enabled - Modbus - BACnet - LonWorks The Brain can be installed as the final temperature control device before the hot water leaves the plantroom or be used to create control zones within the building to simplify balancing, improve circulation and easily manage a thermal disinfection regime. The Brain is also a retrofit to existing problematic hot water systems.
5 REX DUAL 30 BUILT-IN HOT WATER SAFETY FROM THE START With integrated systems for generating hot water, as below, now common, maintaining accurate temperature control can often be difficult. The installation of the Brain between the hot water generation plant and the user is an intelligent system operation protocol that will ensure the comfort and safety of users at all times and from every bathroom fixture Combination of solar, heat pump and gas fired DHW generation (Typical) THE BRAIN WITH SOLAR & HEAT PUMP & BOILER 52 C HEAT PUMP The Brain is designed to be the final temperature control device for any hot water generation system. DOMESTIC HOT WATER SYSTEM BALANCING The improper balancing of hot water flow and return circuits can cause long lengths of stagnant water in the pipework. This increases Legionella growth risk and wastes utilities due to users having to wait for extended periods for hot water. Rather than controlling the circulation of the complete hot water system from the plantroom it is beneficial if the network is divided into manageable zones. A zoned hot water system will be simple to balance system; which will maintain accurate temperature control at all demand conditions, ensure good pipeline velocities around the whole circuit and make any thermal disinfection regime easy to manage. A Digital Recirculating Valve complete with its own dedicated hot water recirculating pump can be installed to control the hot water flow and return temperatures for each designated zone, which could be a single floor or a group of floors or risers.
6 THE BRAIN - ZONING Using the Brain s unique ability to control accurately with a small differential temperature, between the valve outlet and hot water return, it enables the design of shorter recirculation loops, and so maintain tighter control of the loop temperature, keeping in the Safe zone of 52/50 C. The design of the hot water system for high-rise buildings can be challenging. Due to high static water pressures in the risers, which need to be reduced before being delivered to the fixtures, it can mean having to install a pressure reducing valve to each room in the building. THE BRAIN - SINGLE & MULTIPLE FLOORS - LOW RISE The Brain Legend : BV IV Balancing Valve Isolation Valve Recirculation Pump The Brain THE BRAIN - SINGLE & MULTIPLE RISERS The Brain The Brain Legend : BV Balancing Valve IV Isolation Valve PRV Pressure Reducing Valve Recirculation Pump
7 To reduce installation and ongoing maintenance costs it is possible to create low pressure temperature control zones in the building, using only two Pressure Reducing Valves per zone, as shown below. A small brazed plate heat exchanger acts as a barrier between the high pressure riser and the low pressure zone/loop serving the room fixtures. Any temperature loss in the low pressure recirculation loop is made up via the heat exchanger. During demand periods hot and cold water is reduced in pressure before being blended in the Brain and sent at a safe temperature to the fixtures. THE BRAIN - SINGLE & MULTIPLE FLOORS - HIGH RISE WITH PLATE HEAT EXCHANGER High Pressure Low Pressure The Brain Legend : CV Check Valve BV Balancing Valve IV Isolation Valve PRV Pressure Reducing Valve Recirculation Pump High Pressure Low Pressure The Brain Armstrong can deliver a tailor made solution for any zoning requirement. A pre-packaged system from Armstrong will ensure a simple and time efficient installation that will operate correctly the first time, every time, with minimal or no commissioning. Zoning package with Plate Heat Exchanger & PRV s Digital Mixing Centre with duty/ stand-by Brains for installation in a ceiling void
8 THE FUTURE OF HOT WATER SYSTEM MANAGEMENT IS HERE. SAGE raises utility system management to a groundbreaking new level by enabling you to maximize equipment reliability, efficiency and safety. The powerful software uses our patented algorithm as it analyzes data to track behavior and performance, making SAGE the most advanced tool for smart thermal utility monitoring, measuring and reporting available today. SAGE IS AN INTEGRAL PART OF YOUR COMPLETE HOT WATER SYSTEM SOLUTIONS. SAGE was engineered to work seamlessly with all of Armstrong s real-time monitoring products, including The Brain.
9 SMART SYSTEM MONITORING, THE BRAIN AND SAGE SAGE works seamlessly with The Brain as it analyzes data to track behavior and performance as an integral component of a hot water system operation protocol which complies with a Standard of Care. FEATURES Simple, effective monitoring, logging and remote alerting of key temperature control components of a hot water system safety risk management plan, for a modest monthly fee. Dashboard Monitoring In real time. Secure Remote Programming You are in control. Multi-location View All properties simultaneously or filtered. Temperature and System Diagnostic Alerts In real time. Digital Documentation and Recordkeeping For as long as you want to retain it. BENEFITS Safety Early warning system if hot water temperature do not meet specification. Patient/guest/student safety. Compliance Track and document hot water system behavior and performance to ensure compliance with global hot water safety system guidelines implemented to reduce the risk of Legionella. Performance SAGE is programmed to track warranties, recommend/remind service intervals and communicate/suggest manufacturer recommended parts replacements provides hotel owner/operator room compensation protection. DOCUMENTATION & RECORDKEEPING Establish documentation and maintain records. CONTROL LIMITS Establish limits within which a chemical or physical (water temperature) parameter must be monitored and maintained. MONITORING Establish a system for monitoring the parameters associated with the control limits. Hot water storage temperature Mixed outlet from the Brain to rooms Brain controls accurately to better than+/-1 C no matter the demand Hot water return temperature Drop in temperature indicates large instantaneous hot water demand as cold water enters the Brain
10 PACKAGES TO SUIT YOUR INDIVIDUAL APPLICATIONS Armstrong International manufactures a range of Digital Hot Water Solutions that incorporate all the advantages of The Brain Accuracy, Simplicity, and Connectivity. Digital-Flo Water/Water: Delivers blended hot water at +/- 1 C, even at very low flows Water temperature raised above Legionella survival levels on every recirculation cycle Digital-Flo Semi-Storage: Delivers blended hot water at +/- 1 C, even at very low flows Water in the tank is raised above 70 C, which greatly reduces the risk of Legionella proliferation in the tank Delivers a 25% higher peak flow compared to a standard system with the same size tank Enables the use of smaller tanks, thus a reduced footprint Energy efficient - tanks are insulated with 100mm glass fibre Buffer vessel in 316L stainless steel
11 Digital-Flo Vertical Semi-Instantaneous Steam/ Water Heater: Pre-Piped Digital Hot Water Generation and Control Solutions Featuring The Brain Digital Recirculating Valve Choose from 16 standard assemblies or customize Compact vertical design Small footprint Simple tube bundle access Optional SAGE Building System interface with integral data-logging Water temperature raised above Legionella survival levels on every recirculation cycle All Armstrong Digital-Flo hot water generation packages are compatible with the optional SAGE Building System interface with integral data-logging. REGARDLESS OF THE METHOD YOU USE TO HEAT WATER, WE HAVE THE INTELLIGENT SOLUTIONS YOU NEED. Our experts will show you how to avoid scaling, improve efficiency and safety. ARMSTRONG DOES IT ALL. We can solve your problems and prevent them with a packaged solution designed specifically for your unique parameters. We offer a full range of individual state-of-the-art products, including: water heaters, water temperature controls, hose stations and ancillary accessories such as storage tanks, pressurereducing valves and more. From a complete, fully integrated hot water system for a new installation to custom-engineering and turnkey solutions for each of your existing buildings worldwide, Armstrong is your single source solution.
12 INTELLIGENT SOULUTIONS IN STEAM, AIR, AND HOT WATER Armstrong International Europe / Middle East / Africa armstronginternational.eu Armstrong International, SA Bulletin 435-A/Eng 08/17
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