Belimo Holding Ag

Philip Holoch

Marc Thuillard

Peter Schmidlin

Forest Reider

Frank Lehnert

Stefan Mischler

Silvio Grogg

Urs Niederhauser

Reto Hobi

Curdin Stäheli

Volkher Scholz

Michael Hediger

Pasquale Wintsch

Mats Lindgren

Carl Carlander

Karin Megnet

Benjamin Schönenberger

Daniel Hauser

Alexander Egli

A method for determining antifreeze content in a fluid of a heating, ventilation, and air conditioning (HVAC) system includes receiving, in a processor, measurement data of the fluid, the measurement data comprising a measured temperature of the fluid and a measured speed of sound in the fluid, calculating, in the processor, for each of a plurality of antifreeze concentration values a fitting parameter, using the measurement data and one or more of previous measurement data or previous antifreeze concentration data, and determining, in the processor, an antifreeze concentration in the fluid by selecting the antifreeze concentration value with an optimal fitting parameter.

Method and device for determining antifreeze content in a fluid of an HVAC system

A flow control device () for an HVAC fluid transportation system comprises a flow tube () formed in one piece, a flow measurement system () integrated with the flow tube () and configured to measure a volumetric flow of fluid (&#x3d5;) through the flow tube (), and an electronic circuit () arranged in a fixed fashion on the flow tube () and connected electrically to the flow measurement system (). The flow control device () further comprises a control signal output terminal () attached to the flow tube () and connected to the electronic circuit (). The electronic circuit () is configured to generate and apply on the control signal output terminal () an actuator control signal, using the volumetric flow of fluid (&#x3d5;) measured by the flow measurement system (), for an actuator actuating a valve of the HVAC fluid transportation system () arranged outside the flow tube () of the flow control device ().

Flow control device for an HVAC fluid transportation system

The invention relates to an electronic flow controller () for applications in the HVAC field, said electronic flow controller comprising a one-piece valve body () which is penetrated by a flowing medium. The valve body is divided into a valve portion () and a flow measurement portion () along the flow direction, wherein a valve element () is arranged in the valve section () for the control of flow, wherein said valve element can be controlled from the outside via a valve spindle (), and wherein a measurement path () is formed in the flow measurement portion () for determining the flow rate by means of ultrasound. In order to achieve a compact arrangement and a greatly simplified assembly, accesses () for coupling and/or outcoupling ultrasound into or from the measuring path () are formed on the valve body () in the region of the flow measurement portion (). A control unit () is placed on the valve body (), which comprises first means () for actuating the valve element (), said first means being in engagement with the valve spindle (), and second means () for emitting and/or receiving ultrasound signals which are acoustically coupled to the accesses () for coupling and/or outcoupling ultrasound.

Electronic flow controller

The invention relates to a method for determining the heat flow (dQ/dt) emanating from a heat transporting fluid (), which is a mixture of at least two different fluids, and which flows through a flow space () from a first position, where it has a first temperature (T), to a second position, where it has, due to that heat flow (dQ/dt), a second temperature (T), which is lower than said first temperature (T), whereby the density and specific heat of said heat transporting fluid () is determined by measuring the speed of sound (vs) in said fluid, and said density and specific heat of said heat transporting fluid () is used to determine the heat flow (dQ/dt).

Determining the heat flow emanating from a heat transporting fluid

A drive apparatus () for a fire damper () having an electric drive (), which holds the fire damper in a normal position when power is supplied and moves it into a safety position when no power is supplied. A thermal contact breaker () interrupts the power supply to the drive () at a melt temperature. The drive apparatus () also has a temperature sensor () for measuring the air temperature (T), a gas sensor () for measuring the content (G) of fumes in the air, and a switch module (), which interrupts the power supply depending on the values of T and G. In the event of a fire, the fire damper can thus be moved into a safety position not only when the temperature in the region of the thermal contact breaker () is high, but already when smoke or gas develops as a result of the fire.

Drive for fire damper

A flow sensor () comprising a flow channel () embedded in a base body ('), a flow sensor element () adjacent to the flow channel () and a cover plate () covering the flow channel () and arranged on the base body (&#x2032;). The flow channel () is formed by an elastic sealing lip () which delimits the channel (), running on and around an upper side of the base body (&#x2032;) lying opposite the cover plate () such that a seal is formed. This arrangement allows the formation of a sealed structure where a flow channel () with a level channel that avoids contamination and turbulence and has laminar current flowing through the flow channel ().

Flow sensor including a base member with a resilient region forming a flow channel and a cover member covering the flow channel

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Neschwil, Switzerland

Philip Holoch