Remote Warranty Validation and Service and Maintenance for HIUs

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For any residential building project, time saved on site is hugely beneficial for developers, contractors and housing associations alike, helping to reduce project costs and enabling residents to occupy properties as quickly as possible. With this in mind, we have introduced remote warranty validation for our ModuSat heat interface units (HIUs), which can significantly reduce the cost of commissioning and time spent on site by engineers manually checking and adjusting settings.

Many other heat interface units for communal and district heating developments require an engineer to physically attend site to set-up every individual unit manually, adding time and cost to the project. Our electronically controlled ModuSat HIU’s feature SmartTalk communication technology and can be connected over the internet to remote servers, enabling us to check the operation of each unit remotely and adjust settings where required.

Once ModuSat units are installed and ready to be commissioned the following quick and simple process takes place –

  • Installer Registers ModuSat Units Using Evinox’s Online Registration Portal
  • Evinox Check the Operation of Each ModuSat Unit remotely
  • Evinox Visit site to inspect a sample of units (Around 10% of the total units)
  • Evinox will then certify the units and issue certificates
  • The Warranty period begins

The benefits don’t just end there! During the aftercare period, following practical completion, Our SmartTalk remote communication system enables checks to be made and faults to be diagnosed away from site. Just think about the costs incurred every time an engineer is called to site, well these can be avoided using our communication system to adjust settings remotely.Remote Communication for ModuSat HIUs

It is also important to factor in on-going servicing and maintenance, which maximises the life of the Heat Interface Unit and ensures optimum performance of both the HIU’s and also the wider heat network. Our SmartTalk® communication system allows for scheduled maintenance checks to take place remotely over the internet.  The system in each apartment can be fully controlled remotely, including timings and settings, with remote diagnostic capability and client support. This can avoid unnecessary call-outs as a result of user error. Fault alarms can also be checked by testing the operation of components.

We offer after-care service and maintenance plans that are available with one or two-year contracts providing flexibility, and additionally, combined packages for energy billing and maintenance, all under one roof and with discounts available.

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Hot Water Response Time and Heat Network Efficiency

Read our latest blog, which discusses the design trade-offs between hot water response and energy efficiency in heat networks.

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Hot Water Response Time and Heat Network Efficiency

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As the old saying goes – you can’t have it all. When it comes to heat networks, there is a distinct balancing act between heat network efficiency and hot water response time.

In this blog, Helen Gibbons, Technical and Design Manager at Evinox will discuss the trade-offs between hot water response and efficiency in heat networks.

 

VWART vs. DHW response

Introduced in 2016, the BESA (British Engineering Services Association) UK Standard for HIUs was launched to help designers and specifiers evaluate the performance of a particular unit on their network. To date, of the 7 electronic units with published test results, a trend can be seen where the HIU achieving the lowest VWART delivers the slowest DHW response time, and vice versa. Most units tested achieve balanced results and end up somewhere in the middle for both tests.

BESA RESULTS GRAPHS

The charts shown above display a VWART figure and DHW response time for each electronically controlled HIU that has been through the BESA test (I haven’t included results for mechanical HIUs as they are not able to control the keep warm functionality). These results clearly show a correlation between a low VWART figure and slow DHW response. HIU manufacturers who have put their unit forward for this test have made a choice – what do we think is more important, VWART or DHW response time?

The manufacturer with the impressive VWART figure of 28.0 °C has achieved this partly by allowing their DHW response time to increase to 12 seconds for the high temperature test (and 14 seconds, close to the required limit of 15, in the low temperature test). At the same time, the manufacturer with the fastest DHW response time, which is 6 seconds, has clearly achieved this at the expense of the VWART – achieving 38.4 °C.

 

What is keep warm functionality and what role does it play?

One of the key impacts on the overall VWART figure is the use and control of the “Keep Warm” facility, which is designed to keep the hot water plate heat exchanger warm continuously so that the HIU’s can provide a fast response as soon as there is demand for domestic hot water. This function also has the added benefit of keeping the risers and laterals warm, although additional controlled bypass valves are sometimes required, for example at the top of the riser or at the end of laterals.

(Check out my previous blog for more information about Keep-warm)

Whilst the VWART figure clearly reflects the efficiency of the plate heat exchangers and valves used in the unit, it also shows that improvements can be made by adjusting the keep warm strategy and allowing the DHW response time to increase. It’s obvious when you think about it, if less power is used to keep the plates warm, it will then take longer to receive hot water.

With the new generation of electronically controlled smart HIUs on the market, which feature self-learning, there are a number of settings that can be put in place for the keep-warm functionality, to help provide a fast DHW response with a low VWART. Take our ModuSat XR as an example, the self-learning functionality means the unit can learn what time you get up every morning and make the plate hot and ready for you by that time. Even if this might not show in BESA test results, in real life terms this will further reduce the return temperature.

Additionally, with a Smart HIU the network operator is able to decide the best solution for their specific network and make adjustments to the settings remotely. Is it DHW response time for the residents or the overall efficiency of the heat network or an agreed compromise for both?

 

Legionella and DHW response

But by how much can you delay the DHW response time without getting into bother? Is the DHW response time a question of convenience and comfort, or are there other aspects at play?

These questions go hand in hand with what I discussed in my previous blog post about timing the keep warm function, where a large energy saving can be made if the system is designed in a way which lets the keep warm function switch off during parts of the day.

One of the arguments out there against a delayed DHW response time, is the possibility of the hot water taking longer than 60 seconds to reach the outlets. The Hot Water Association even goes as far in their Design Guide for Stored Water Solutions [1] as to boldly state that the keep warm function is required for twin plate HIUs to meet requirements of legionella and water regulations, which is simply not true.

This all stems from HSE’s advice on Legionnaires disease, where in HSG274 Part 2 it states that the traditional strategy for reducing risk of legionnaire’s disease, is to store water at 60°C or above, and for this water to be distributed so that it reaches the outlet at 50°C within one minute. It is important to note that the same document classes instantaneous heaters as low-risk systems.

The same advice is replicated in BSRIA’s Legionnaires disease O&M log book, which suggests that hot water should reach 50°C within one minute, but class instantaneous water heaters as an alternative system presenting minimum risk from legionella.

BSRIA Legionnaires disease O&M log book

This advice is replicated in a number of other documents, all referencing back to HSE 274 Part 2.

The above table from BSRIA makes it clear that the “50°C within 60 seconds” school of thought stem from advice based on stored water, but as there is next to no stored water in a twin plate HIU, the risk of legionella is minimised.

We also have the well-respected German Standard DVGW W 551 (Drinking water heating and drinking water piping systems; technical measures to reduce Legionella growth) which states that if controlled properly, a system with a total volume (from hot water production to end use) of less than 3 litres can eliminate the risk of Legionella.

Standards and regulations aside, is there actually a risk of legionella if the DHW takes longer than 1 minute to reach the outlet? From what I have found there is and there isn’t, but the DHW temperature set point at the HIU makes no odds.

At 60°C, it takes 25 minutes to kill the legionella bacteria [1].  If we take this information and think about cold water being heated up to 50°C in the plate heat exchanger of the HIU. The water will be heated for a fraction of a second, nowhere near enough time to kill any of the bacteria present in the water.

This is backed up by the following graph illustrating how long it takes to decrease or increase the growth of legionella bacteria at different temperatures [2]:

Growth of legionella bacteria Graph

The y-axis is showing the number of bacteria colonies per ml H2O and the x-axis is showing hours lapsed. This graph shows that after one hour at 50°C, the bacteria has reduced by 60%, but that during the small amount of time the water is heated to 50°C in the PHE, the level of bacteria is unaffected.

What about if the water is heated to 50°C and kept at 50°C during the one minute it takes for it to get to the tap? Nope, it still doesn’t look like one minute at 50°C will be able to kill much of the bacteria that would potentially be present in the water.

The conclusions I draw from this information are that getting the water to the tap at 50°C within 1 minute has no effect on the legionella risk when it comes to instantaneous twin plate HIUs. The risk is where the water is stored, ie. in the cold water booster tank and the cold water distribution pipework. This is where there is a risk of the legionella bacteria multiplying if the temperature of the cold water is too high, and if the bacteria has been given the chance to grow in the cold water pipework. Heating it to 50°C or even 60°C in an instantaneous water heater will not kill it or even noticeably reduce the levels.

Despite this information, I can still understand if system designers would like to stick to the 50°C within 1 minute rule in the absence of any firm advice regarding instantaneous heaters. Even BS 8558:2015 quotes the 50°C within one minute rule, but again references back to HSG274 Part 2. A discussion needs to be had with HSE to see if this piece of advice can be rewritten to clarify that this rule should not apply to instantaneous heaters.

If legislation stipulates a high DHW temperature with a very fast DHW response time, this will lead to the continuation of unnecessarily oversizing heat networks under a false pretence that this somehow protects the end user from contracting Legionnaire’s disease.

There is of course still the comfort argument to be had, but that’s for another day.

 

Hot water return and heat network efficiency

In line with the above, we often see projects where a specific domestic hot water return temperature is detailed in the specification for instantaneous twin plate HIU’s. When we see this, it is important to have a discussion with the client to understand the reasons behind the required temperature and explain how this might affect the heat network efficiencies.

As with the keep warm facility, the DHW return will increase convenience for the resident but will come at an expense of the heat network. The return temperature of the primaries cannot physically be lower than what they are cooling down against, and if they are constantly cooling down against a hot water return of 50°C, the primary return will always be above 50°C in this mode.

The above will also mean that the HIU will constantly be bypassing primary water, so both the total volume of water, as well as return temperature, will increase.

 

Alternative designs that offer a happy medium

When I said earlier that you can’t have it all – this is of course not true. There are a couple of ways in which you can have a fast DHW response time which will not come at the expense of the heat network efficiency. Solutions we recommend include the following;

  • Trace heating of the hot water pipework. If a trace heating cable is placed on the pipework underneath any lagging, you will still get the fast delivery of hot water. And as the trace heating is only used to maintain the temperature of the water in the pipe, rather than heating it up from cold, the energy consumption from applying this is low.
  • Reduce the size of your hot water pipework. Let’s say the pipework required from the HIU to your hot water outlet is 6 meters. If you use 22mm copper to deliver this water, and the required hot water flow rate is 0.10 l/s, the velocity within the pipework will be approximately 0.31 m/s and it will take the water almost 20 seconds to get to the outlet. Reduce the pipework dimension to 15mm and the delivery time is more than halved to 9 seconds. And if you are able to use 10mm pipework the velocity increase to 1.64 m/s with a delivery time of only 4 seconds! This means that even if the HIU takes 55 seconds to get the hot water up to 50°C, you are still within the golden minute.

If this is not possible, an alternative to using small dimension pipework is to install a potable water manifold at the HIU, and to have a single pipe serving each outlet.

 

Conclusion

In almost all cases – fast hot water response time will come at the expense of the heat network efficiency. As an industry, it should be our priority to make these networks as efficient as possible to avoid getting negative press and secure the position of heat networks in the UK infrastructure. It is the price per kWh and the carbon emissions that will get measured at the end of the day – not how long people have to wait to have a shower, especially not when it is a question of seconds.

In high end developments, where comfort and convenience are especially critical, the alternative design solutions should be used, i.e. trace heating or small-bore pipework. As long as there are ways around this, let’s allow our systems and HIU’s to perform as efficiently as possible.

But most importantly of all, let the operator of the heat network decide what they want to do, after all, they will know their system and residents better than any of us. Is efficiency and cost important? Is fast hot water response important? As long as we give the operator the information and benefits of different options, why not let them decide? With a smart-HIU they can even try different options out over time, until they find the ultimate strategy for their building.

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Fresh New Website Showcases Our Heat Network Products and Services

We are delighted to announce the launch of our new company website, which features a fresh look and feel and user-friendly navigation.

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Fresh New Website Showcases Our Heat Network Products and Services

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We are delighted to announce the launch of our new company website, which features a fresh look and feel and user-friendly navigation, enabling users to browse through our extensive range of heat network products and services with ease. These include a range of smart heat interface units (HIUs) and comprehensive support services including metering, billing, revenue management and service and maintenance.

Delivering a fully responsive experience, the new website gives users a seamless transition from desktop to mobile browsing and has been designed to provide heat network information for Housing Developers, M&E Consultants, Housing Associations and Building Managers, covering all stages of a communal or district heating project.

Evinox Heat Network Solutions Website Office Desk

Emma Alexander, Marketing Manager at Evinox Energy, says“We are really excited about the launch of our new site, which we’ve packed with useful heat network information, including articles, case studies, best practice and regulation advice, alongside technical information about our ModuSat® Smart HIU range and metering, billing and maintenance support services. We love the new look and feel of the site, and see it as the cornerstone of our online marketing strategy, aligning our digital platform much more closely to our brand and product and service offerings,”

Let’s Talk About Smart HIU’s

The new Smart Heat Interface Unit Hub on the Evinox website features plenty of technical content and useful information and includes everything you need to know about Evinox’s ModuSat® range of HIUs. The hub also covers topics such as the UK BESA HIU test standard, designing for energy efficient networks and the benefits of electronic control. It even features an online tool for selecting Heat Interface Units based on your project parameters and provides calculations for the whole network. Users can also request one of Evinox’s CIBSE accredited CPD seminars and download the Heat Network Design Guide via the website.

Find Out How Evinox Can Help with Metering and Billing for Your Heat Network

The website walks you through all the requirements of a successful metering and billing system for a heat network development. This includes information about the typical network set-up, which domestic and commercial meters might be required, credit billing services, debt free Pay-as-you-go technology and guidance about how to comply with the Heat Network (Metering & Billing) Regulations 2014.

Service & Maintenance Support for Heat Networks

Knowing how vital the support services can be for the operation the heat network and HIUs alike, Evinox’s new website provides lots of useful information for housing developers and building managers. Find out more about our internet based remote Service and Maintenance for HIU’s, enhanced warranty cover, plant room maintenance and combined plans for billing and service where we offer very competitive discounted rates for both in one package.

Emma Alexander continued“As we strive to improve every aspect of Evinox’s on and offline presence, flagship projects such as this demonstrate our commitment to excellence to our customers and partners. I’m extremely excited to be involved in the continued evolution of Evinox Energy and look forward to sharing what we’ve got in the pipeline over the coming months”.

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New Online Tool Helps Designers with HIU Specification

Evinox are excited to announce the launch of the ModuSat® Heat Interface Unit Online Selector, which recommends the ideal units for heat network developments.

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HIU Keep Warm – What’s the Best Approach?

Helen examines different approaches, and how best to balance the supply of hot water with the overall efficiency of the network

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New Online Tool Helps Designers with HIU Specification

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Evinox are excited to announce the launch of the ModuSat® Heat Interface Unit Online Selector. Available via the Evinox Energy website, this intuitive tool recommends the ideal HIU(s) for a district or communal heat network development, based on project parameters entered by the user

Screen shot of selector toolWith over 15 years of experience in the design and manufacture of interface units for heat network systems, Evinox created the Selector with M&E consultants in mind, aiming to provide a tool that is easy to use, and can help with sizing and selection whilst saving time for the specifier.

Helen Gibbons, Evinox Technical and Design Manager comments – “This unique new tool is an extension of the Evinox Heat Network Design Guide that is used by many M&E consultants in the UK. It draws on Evinox’s experience sizing HIU’s for numerous communal heating projects, and also recommendations from the Swedish District Heating Association Technical Provisions F:101, Danish Standard 439 and the CIBSE CP1 – Heat Networks: Code of Practice for the UK “

Helen continues “In addition to the heat interface unit sizing and selection functionality, our new tool provides heating and hot water technical performance information specific to the users’ project, complete with Low Temperature Hot Water (LTHW) calculations for the whole heat network, which can act as a useful guide for the design and specification process.”

A well as all the functionality detailed, the user can also save unit selections and calculations for each project and come back at any time to access or edit them or to create a new selection, making this a really useful resource for consultants.

Find out how the ModuSat® Selector can help with the specification of heat interface units and try it out by visiting the Selector here.

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HIU Keep Warm – What’s the Best Approach?

Helen examines different approaches, and how best to balance the supply of hot water with the overall efficiency of the network

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HIU Keep Warm – What’s the Best Approach?

Helen examines different approaches, and how best to balance the supply of hot water with the overall efficiency of the network

Discover how Evinox Energy can deliver the best solution for your next new build or refurbishment heat network project

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ModuSat® Is Tested to NEW BESA HIU Standard

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Evinox are very proud to announce that the ModuSat® XR Heat Interface Unit has been tested to the BESA (British Engineering Services Association) UK Standard for HIUs, achieving impressive results all round.

Launched in late 2016, the BESA UK Standard for Heat Interface Units was introduced to help designers and specifiers evaluate the performance of a particular HIU on their network. This new standard aims to provide HIU benchmarking, similar in many ways to the well-known SEDBUK scheme for domestic boilers.

Currently, only a handful of manufacturers have published results for the HIU test regime, with Evinox being one of the first to undertake the testing process.

BESA VWART Image

Superb Results for ModuSat® XR

With an overall VWART of just 33.4℃, impressively low domestic hot water return temperatures and the ability to deliver flexible Keep Warm operation, the BESA test results provide a clear, independently verified confirmation that the Evinox ModuSat® XR range delivers outstanding heating and hot water performance for modern heat networks.

Mike Shaw, Commercial Director at Evinox Energy commented “We believe independent testing is a vital step forward for the Communal & District heating industry, and as one of the UKs most established HIU manufacturers, we were determined to be involved from the early stages. Our latest ModuSat® XR and XR-ECOmodels have been developed very much with the new standard in mind and we’re confident that this regime from BESA will lead to more efficient heat networks being designed and delivered”.

The BESA standard is currently optional, however, Evinox believes this will be a mandatory requirement in the near future, and asks designers and specifiers to start insisting on the use of BESA tested units for their heat network projects going forward.

You can find out more and download the full report and test results by visiting our BESA test standard page. Alternatively, why not book our CIBSE accredited CPD Seminar – Understanding the BESA Test Standard for HIUs – VWARTS and all.

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ModuSat® XR Takes HIU Efficiency to Another Level

Evinox has extended its best-selling range of ModuSat® Heat Interface Units with the introduction of the new ModuSat® XR and ModuSat® XR- ECO

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Evinox team of CIBSE Certified Heat Network Consultants expands

Evinox has added to its CIBSE certified Technical and Design team, with Design Engineer Arturs Kokins becoming the latest to successfully complete the CIBSE Heat Networks Code of Practice course.

Discover how Evinox Energy can deliver the best solution for your next new build or refurbishment heat network project

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ModuSat® XR Takes HIU Efficiency to Another Level

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Evinox has extended its best-selling range of ModuSat® Heat Interface Units with the introduction of the new ModuSat® XR and ModuSat® XR- ECO Twin Plate models.  Providing both indirect space heating and domestic hot water, ModuSat® XR units are ideal for use in modern, efficient district and communal heat networks. All units deliver fast, dynamic domestic hot water response, and the ModuSat® XR-ECO models also provide ultra-low DHW return temperatures to the primary heat network. ModuSat XR Twin Plate Heat Interface Unit

With extensive experience in the design and application of HIU’s across thousands of UK-wide installations, Evinox has made significant advances in the performance of its latest range, aiming to help improve the overall efficiency of heat networks, whilst retaining high levels of user satisfaction and comfort levels.

ModuSat® XR – even faster, more efficient domestic hot water performance

An overriding requirement for many consulting engineers involved in the design and specification of communal or district heating systems is to ensure abundant and responsive supply of domestic hot water. This goes hand-in-hand with residents expecting consistent and safe hot water at the tap.

To achieve this, our ModuSat® XR HIUs incorporate electronically controlled PICVs with fast acting sensors and actuators, combined with our control logic, which features a self-learning function to accurately match output to the required demand.  Not only does this provide high levels of user comfort and convenience, but also significantly reduces energy and water wastage.

“There is strong evidence that speed of hot water delivery is a key requirement for residents living in homes operating on communal and district heating schemes” comments Emma Alexander, Evinox Energy Marketing Manager.  “The ability to be able to deliver abundant hot water quickly, while at the same time ensuring the efficiency of the heat network is not compromised, is a key challenge for heat network designers and HIU manufacturers, so the improved performance of the new ModuSat® range is an important step forward in this area.”

Evinox ModuSat® XR-ECO; how low can you go?

It’s clear that lowering system temperatures is a critical factor in the efficient operation of UK heat networks. Reducing the network primary flow & return temperatures enables heat generation plant to operate more efficiently; lower grade, low carbon heat sources to play a more predominant role in the energy mix; and network heat losses to be dramatically reduced.

ModuSat® XR-ECO units have been designed precisely with this in mind, incorporating ultra-high efficiency domestic hot water plate heat exchangers with improved volumetrics that encourage turbulent flow and optimal heat transfer.  This enables the latest range of ModuSat® XR-ECO HIU’s to operate effectively on modern, low temperature heat networks with primary flow temperatures as low as 55°C, while still able to deliver high temperature, high flow rate hot water for typically sized new build apartments.

Furthermore, with DHW return temperatures as low as 16.4°C[1], the ModuSat® XR-ECO exceeds industry best practice guides, such as the London Heat Network Manual and CIBSE/ADE Heat Networks Code of Practice (CP1), which recommend primary return temperature of less than 25°C from domestic hot water production at design load.

These latest improvements from Evinox’s ModuSat® XR-ECO Range means, designers are given the opportunity to focus on the energy efficiency performance of HIU’s and the wider heat network, with the confidence that units will continue to deliver impressive full load hot water capacity and flow rates.

ModuSat XR-ECO HIU Logo

A New Test Standard for Heat Interface Units from BESA

The ModuSat® XR has been tested under a new UK test standard, intended to help heat network designers to evaluate individual HIU performance on their network under typical UK conditions.  The new scheme, operated by the Building Engineering Services Association (BESA), will provide HIU benchmarking, similar in many ways to the SEDBUK scheme for domestic boilers.

Evinox believes independent testing is an important step for the UK HIU industry, so the latest ModuSat® XR and XR-ECO models have been developed very much with these new standards in mind. Evinox is confident that this new standard will lead to HIU systems and heat networks being designed with efficiency as much as maximum hot water capacity being the key consideration.

Find out more about the new ModuSat® XR Range of Heat Interface Units by by visiting the Product Page or Contact us on 01372 722277 / via our Contact Us Form.

[1] The Primary DHW Return Figure of 16.4°C shown relates to the ModuSat XR-ECO 70-XX operating on a network with 70°C Primary flow.
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Our HIU Delivers an Impressive Hot Water Response

Our ModuSat Heat Interface Unit takes around 15 seconds to reach 55°C from the tap opening, providing an impressive dynamic response.

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Evinox team of CIBSE Certified Heat Network Consultants expands

Evinox has added to its CIBSE certified Technical and Design team, with Design Engineer Arturs Kokins becoming the latest to successfully complete the CIBSE Heat Networks Code of Practice course.

Discover how Evinox Energy can deliver the best solution for your next new build or refurbishment heat network project

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Our HIU Delivers an Impressive Hot Water Response

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Contact us on 01372 722277 for further information or a quotation.

Our ModuSat Heat Interface Unit takes around 15 seconds to reach 55°C from the tap opening, providing an impressive dynamic response.

Using advanced Proportional Integral Derivative (PID) control logic, in combination with PICV’s and a fast-acting actuator, the primary flow rate modulates to match the DHW or HTG demand and responds instantly to the changing loads.

Our Fast hot water response provides several benefits: –

  • Ensures that end user comfort is achieved by providing consistent, safe hot water at the tap.
  • The system is more efficient due to our fast control guaranteeing a low return temperature to the primary network at all times.
  • Minimises the amount of energy wasted.
  • The building owner has a hassle-free, efficient development.

FairHeat Tests

Heat interface units play a vital role in the efficiency of district and communal heating networks. As a result, Fairheat have developed a technical standard for testing the HIU performance, derived from the Swedish F:103-7e certification, but modified to better fit typical UK Heat Network operating parameters. This is a project that was funded by DECC.

Under the initial method of assessment, several tests were performed included heating tests, static domestic hot water tests, dynamic hot water tests, low flow hot water tests and keep warm facility tests. Our ModuSat HIU was included in the first phase of tests and performed well within the technical specification set out by Fairheat. Now with the improvements we have made to ensure a high speed DHW response, our ModuSat unit will be one of the top performing UK HIU’s in the Fairheat test method version 2.

Choosing the right HIU

Your choice of Heat Interface Unit (HIU) is a crucial element of the system design, installing the best solution from the outset can provide a more efficient and easy to manage scheme. With advances in technology and growing experience in system design, improved methods of controlling HIU’s and the primary network are available.

The use of PID controlled PICV’s in HIU’s means that only one valve is required for differential pressure control, flow modulation and full energy shut off. This reduces the size and weight of the unit, keeps maintenance costs to a minimum and increases functionality. In addition, Evinox Energy HIU’s are supplied prepayment ready with a room controller meaning there is no requirement for additional controls, sensors or equipment to provide remote monitoring of temperatures and flow rates or to switch the end user to a debt free Pre-Payment system.

(This will be available on ModuSat units supplied from Summer 2017)

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Future Proof Heat Interface Units

Your choice of Heat interface Unit (HIU), for dwellings connected to a communal or District heating network, is a crucial element of the system design. Installing the best solution from the outset can provide a more efficient and easy to manage scheme.

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Evinox team of CIBSE Certified Heat Network Consultants expands

Evinox has added to its CIBSE certified Technical and Design team, with Design Engineer Arturs Kokins becoming the latest to successfully complete the CIBSE Heat Networks Code of Practice course.

Discover how Evinox Energy can deliver the best solution for your next new build or refurbishment heat network project

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Future Proof Heat Interface Units

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Contact us on 01372 722277 for further information or a quotation.

Your choice of Heat interface Unit (HIU), for dwellings connected to a communal or District heating network, is a crucial element of the system design. Installing the best solution from the outset can provide a more efficient and easy to manage scheme. With advances in technology and growing experience in system design, improved methods of controlling HIU’s and the primary network are available.

Our control strategy

Our ModuSat® units use an advanced Proportional Integral Derivative (PID) control logic, in combination with PICV’s and a fast acting actuator, which modulate the primary flow rate to match the DHW or HTG demand, and respond instantly to the changing loads. This ensures that end user comfort is achieved by providing consistent, safe hot water at the tap, as well as guaranteeing the low return temperature to the primary network at all times.

The use of PID controlled PICV’s in HIU’s means that only one valve is required for differential pressure control, flow modulation and full energy shut off. This reduces the size and weight of the unit, keeps maintenance costs to a minimum and increases functionality.

In addition, Evinox Energy HIU’s are supplied prepayment ready as standard, with a room controller for the end user, meaning there is no requirement for additional controls, sensors or equipment to switch the end user to a debt free Pre-Payment system. The integrated technology also enables remote monitoring for diagnostics and improving the efficiency of the system.

PICV’s alone are not the answer

The innovations in Pressure Independent Control Valve (PICV) technology have led to an increase in their use within Heat interface units. Whilst there are a number of HIU’s available that feature PICV technology, it’s vital that they are correctly controlled, and Evinox Energy recommend the use of fast acting actuators and a tailored PID control logic. Failure to size or control PICV’s correctly will result in a reduced level of comfort for the end user and a potentially less efficient primary network.

Evinox Energy are confident that the future of HIU’s lies in electronically controlled units that provide full comfort to the end user, whilst also delivering important information regarding the operation of the system, which can be monitored, adjusted or regulated remotely over the internet.

To achieve the same result using a mechanically controlled HIU, additional equipment may be required such as – an energy shut of valve, credit display device, temperature sensors and flow sensors connected to the BMS or EMS system.

By combining effective HIU control with excellent after-sales end user support and flexible metering and billing services, the building owner has a hassle-free, efficient development and residents enjoy a comfortable and relaxed place to live.

Evinox Case Study Building

Evinox team of CIBSE Certified Heat Network Consultants expands

Evinox has added to its CIBSE certified Technical and Design team, with Design Engineer Arturs Kokins becoming the latest to successfully complete the CIBSE Heat Networks Code of Practice course.

Discover how Evinox Energy can deliver the best solution for your next new build or refurbishment heat network project

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