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Flow into control with Frese BYPASS

Frese BYPASS provides deep insight into your district energy network, allowing you to optimize energy efficiency by lowering temperature and reducing pressure.

Controlling the flow in your district energy network no longer needs to be a guessing game. With the new bypass solution from Danish valve manufacturer Frese you will be able to monitor, operate and control your systems remotely, thereby ensuring significant savings on energy as well as on your bottom line.

- We are focusing on ways to add intellingence to components in district energy networks in order to increse their value to both service providers and customers, says Martin Overbjerg, Business Development Manager for Distict Energy at Frese.

Frese BYPASS consists of an old favorite: The Frese OPTIMA Compact PICV, which is a pressure independent control valve, and a new, intelligent and battery operated controller, which enables remote operation of the valve.

Actual insight with precise data

The central benefit of Frese BYPASS is that it provides actual insight and eliminates some of the uncertainties of pressure and temperature calculations.

- We have collaborated closely with several Danish district heating providers in the development of Frese BYPASS and the benefits of actively using your bypass units are obvious. You can reduce heat loss in your network, and ensure that your customers always have acces to hot water. The new data also allows you to optimize pump operation, avoiding unnecessarily high pressure, Martin Overbjerg explains.

Significant savings through minor changes

Extensive field testing of Frese’s new IoT product supports these claims.

Viborg DHC has conducted a large-scale prototype test by retrofitting around 30 devices into its existing bypass units and has already made a few changes in its network. So far these minor changes have shown major potential in terms of energy efficiency and cost savings.

With the precise data provided by Frese BYPASS Viborg DHC’s Distribution Manager Tom Diget realized that the pressure in a specific part of hís network was unnecessarily high and was able to lower it by 0.4 bar, resulting in annual savings 27,400 kWh – equalling DKK 18,400 - in this area alone.

Viborg DHC has now turned its focus towards temperature control, and Tom Diget has high expectations:

- By placing Frese BYPASS strategically in the grid, the return temperature can be raised slightly at the critical points, while the inflow temperature can be lowered throughout the network. That's where the money starts rolling in. Each time we lower the inflow temperature by 1 degree, we save DKK 250,000 in reduced heat loss, he explains.

Plug-and-play technology

Frese BYPASS is designed with easy operation in mind. It can be retrofitted into existing installations, and because it is wireless and battery operated there is no need for complex or expensive external connections, wi-fi or sim cards. The solution uses the LPWAN network Sigfox, which has its own infrastructure already in place. The Sigfox business model is built on transparent subscriptions with fixed monthly rates per unit. This ensures maximum financial predictability for the customers.

Remote control via dashboard

Operating Frese BYPASS is easy via the web-based dashboard Frese FLOWCLOUD®. This responsive platform provides one central access point to all your Frese BYPASS units where you can obtain further insight into your network through historic graphs of pressure, temperature and valve position on your computer, smatphone or tablet. As Frese develops new features, these will be made available through Frese FLOWCLOUD®.

- Data needs to go where our customers need it to go, so if this is not the right platform for you we also offer third-party API. Data sharing will only accelerate as district energy and other utility companies start reaching for further optimization and synergies, and we want to give our customers the best possible tools for that process, Martin Overbjerg explains.

Sigfox ensures connection

Frese BYPASS is an IoT product – a part of the so-called ”Internet of Things”. This means that the device can communicate electronically with its surroundings – in this case via the Sigfox network. Sigfox utilizes Narrowband technology or LPWAN, which is excellently suited for the very small data packages, which the Frese BYPASS needs to transmit and receive. This network also distinguishes itself by extremely low power consumption and very long reach. The Sigfox business model is built on transparent subscriptions with fixed monthly rates per unit. This ensures maximum financial predictability for the customers.

Currently Sigfox is practically nationwide, but if you install a Frese BYPASS where the signal coverage is limited - for example, deep inside a building - then the signal can easily be improved with a signal repeater.

Read more about the Sigfox technology here..


Nippel/Nippel (ekslusiv modulerende aktuator)

1200C, PN25, DZR

VVS-nummer Frese nr.

406748.103 53-1300

406748.104 53-1302

406748.304 53-1304

406748.106 53-1312

406748.206 53-1307

Nippel/Nippel med 2 stk. trykudtag (ekslusiv modulerende aktuator)

1200C, PN25, DZR

VVS-nummer Frese nr.

406749.103 53-1320

406749.104 53-1322

406749.304 53-1324

406749.106 53-1332

406749.206 53-1327

Muffe/Muffe (ekslusiv modulerende aktuator)

1200C, PN25, DZR

VVS-nummer Frese nr.

406746.104 53-1342

406746.304 53-1344

406746.106 53-1352

406746.206 53-1347

Muffe/Muffe med 2 stk. trykudtag (ekslusiv modulerende aktuator)

1200C, PN25, DZR

VVS-nummer Frese nr.

406747.104 53-1362

406747.304 53-1364

406747.106 53-1372

406747.206 53-1367

Aktuator til Frese OPTIMA Compact

Termo aktuator On/Off, Modulerende til Frese OPTIMA Compact DN10-20


406749.624 48-5520

406749.630 48-5521

406749.674 48-5522

406749.684 48-5523

Elektrisk modulerende aktuator til Frese OPTIMA Compact DN10-20


406749.424 53-1056

406749.460 53-1058

Isoleringskappe til Frese OPTIMA Compact

Isoleringskappe EPS, medietemperatur max 800C


406749.920 38-0855

Frese OPTIMA Compact

Trykuafhængig strengsregulerings- og motorventil

PICV - Designet til at kombinere dynamisk regulering og fuld modulerende kontrol uanset forindstillet flow.

Det innovative design af Frese OPTIMA Compact PICV introducerer en intelligent motorventil, som kan forindstilles til et ønsket max. flow og sikre fuld modulerende kontrol. Selv med forskellige forindstillinger bevarer man den fulde slaglængde, hvilket giver en mere nøjagtig regulering.

Den indbyggede differenstrykregulator giver en 100 % modulerende kontrol, hvilket sikrer en optimal komfort og stabil drift. Samtidig opnår man store energibesparelser, da ventilen automatisk regulerer til netop det flow, der er behov for. Frese OPTIMA Compact PICV kombinerer alle funktioner - og gør dermed arbejdet lettere for rådgivere og installatører.

Frese OPTIMA Compact PICV anvendes i varme- og køleanlæg i applikationer med fan coil units, airconditionanlæg samt veksler- og blandesløjfeanlæg. Ventilen giver modulerende regulering med fuld autoritet uafhængigt af variationer i anlæggets differenstryk. Frese OPTIMA Compact PICV kombinerer en eksternt justerbar dynamisk reguleringsventil, en differenstryksregulator samt en modulerende motorventil med fuld autoritet. Den fulde styring af flowet i bygningen opnås let og samtidig skabes en høj grad af komfort og energibesparelser. Desuden kræves der ingen regulering, hvis yderligere trin føjes til anlægget, eller den dimensionerede kapacitet ændres. Energibesparelser opnås via optimal styring, lavere flow og pumpetryk. Maksimering af ΔT som følge af hurtigere reaktionstid og øget systemstabilitet.