摘要:
A flow sensor (1) comprising a flow channel (14) embedded in a base body (1′), a flow sensor element (13) adjacent to the flow channel (14) and a cover plate (12) covering the flow channel (14) and arranged on the base body (1′). The flow channel (14) is formed by an elastic sealing lip (15) which delimits the channel (14), running on and around an upper side of the base body (1′) lying opposite the cover plate (12) such that a seal is formed. This arrangement allows the formation of a sealed structure where a flow channel (14) with a level channel that avoids contamination and turbulence and has laminar current flowing through the flow channel (14).
摘要:
The invention relates to a method for determining the heat flow (dQ/dt) emanating from a heat transporting fluid (12), which is a mixture of at least two different fluids, and which flows through a flow space (11) from a first position, where it has a first temperature (T1), to a second position, where it has, due to that heat flow (dQ/dt), a second temperature (T2), which is lower than said first temperature (T1), whereby the density and specific heat of said heat transporting fluid (12) is determined by measuring the speed of sound (vs) in said fluid, and said density and specific heat of said heat transporting fluid (12) is used to determine the heat flow (dQ/dt).
摘要:
In a flow sensor (1) comprising a flow channel (14) embedded in a base body (1′), a flow sensor element (13) adjacent to the flow channel (14) and a cover plate (12) covering the flow channel (14) and arranged on the base body (1′), the flow channel (14) is formed by an elastic sealing lip which delimits said channel (14), running on and around an upper side of the base body (1′) lying opposite the cover plate (12) and is pressed against the cover plate (12) such that a seal is formed. The design of the flow channel (14) by means of the sealing lip (5) allows the flow channel (14) to be sealed off from possible gaps between the base body (1′) and the cover plate (12) and in relation to the cover plate (12), such that a flow channel with a level channel bed (14) is formed by the sealing lip (15) and the cover plate (12) which channel bed has smooth peripheral areas and a uniform cross-section, and which if possible avoids the depositing and collection of dirt particles and thus prevents undesirable turbulence in the flow channel (14) and guarantees a laminar current through the flow channel (14).
摘要:
A lambda probe (1) is used with the measuring apparatus for monitoring residual oxygen in an exhaust gas, in which a measuring point for oxygen in a sensor (2) is connected via a diffusion gap (22) with a reaction chamber (24). During operation of the probe the reaction chamber drives a stream of oxygen IO2 along the diffusion gap by means of a controllably adjustable oxygen partial pressure pi. By means of an electro-chemical, oxygen ion pump driven by an electrical pump current Ip, an oxygen partial pressure pi predetermined as a desired value is set in the reaction chamber. In this arrangement the pump current, the strength of which is proportional to the strength of the stream of oxygen driven along the diffusion gap, can be used as a measurement parameter for the partial pressure pm of the residual oxygen in the exhaust gas or its concentration. The residual oxygen can be monitored during a normal operating phase, the phase N. The lambda probe can be operated for test purposes, at times, particularly intermittently in a phase H or a phase L. In these operating phases H and L the oxygen partial pressure pi in the reaction chamber (24) adopts a largely minimum value or a largely maximum value. By means of changing between the named operating phases, by registering the pump current Ip and by comparing the registered pump currents Ip with empirical values, conclusions with regard to the ability of the probe to function (1) can be derived, so that if necessary, in the case of a lacking or faulty ability to function, measures can be introduced to remedy the deficiencies or to exchange the sensor (2).
摘要:
The method for the operation of fuel cell battery (10) comprises a control system (14), through which the electrochemical reactions in cells (11) of the battery are influenced. Gaseous flows (1, 2) of two educts (A, B) are fed into the battery in a controlled manner in a conditionally predetermined ratio of quantities and are passed through the cells separately. The first educt (A) contains oxidizing components, the second educt (B) contains reducing components and the first educt is in particular ambient air. The educt flows (1, 2) are united after passage through the cells and are further treated by means of an afterburning process and with the production of a flow (3) of exhaust gas (C), so that at the conditionally predetermined ratio of quantities the reducing components are completely oxidized. The first educt flow, in particular the air flow, is variable through the control system to a limited extent; it is used for a regulation of the reaction temperature. Simultaneously to the regulation of the reaction temperature the second educt flow is held constant, namely by means of a second regulation (5, 6; 18, 19) which acts on one of the educt flows upstream of the battery inlet (13a, 13b).
摘要:
The invention relates to a method for determining the heat flow (dQ/dt) emanating from a heat transporting fluid (12), which is a mixture of at least two different fluids, and which flows through a flow space (11) from a first position, where it has a first temperature (T1), to a second position, where it has, due to that heat flow (dQ/dt), a second temperature (T2), which is lower than said first temperature (T1), whereby the density and specific heat of said heat transporting fluid (12) is determined by measuring the speed of sound (vs) in said fluid, and said density and specific heat of said heat transporting fluid (12) is used to determine the heat flow (dQ/dt).
摘要:
A drive apparatus (1) for a fire damper (2) comprises an electric drive (10), which holds the fire damper in the normal position when power is supplied and moves it into a safety position when no power is supplied. In addition to a thermal contact breaker (12), which interrupts the power supply to the drive (10) at a melt temperature, the drive apparatus (1) also comprises a temperature sensor (13) for measuring the air temperature value (T), a gas sensor (14) for measuring the content (G) of fumes in the air, and a switch module (15), which interrupts the power supply depending on the air temperature value (T) and the content (G) of fumes in the air. 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 (12) is high, but already when smoke or gas develops as a result of the fire.
摘要:
A lambda probe (1) is used with the measuring apparatus for monitoring residual oxygen in an exhaust gas, in which a measuring point for oxygen in a sensor (2) is connected via a diffusion gap (22) with a reaction chamber (24). During operation of the probe the reaction chamber drives a stream of oxygen IO2 along the diffusion gap by means of a controllably adjustable oxygen partial pressure pi. By means of an electro-chemical, oxygen ion pump driven by an electrical pump current Ip, an oxygen partial pressure pi predetermined as a desired value is set in the reaction chamber. In this arrangement the pump current, the strength of which is proportional to the strength of the stream of oxygen driven along the diffusion gap, can be used as a measurement parameter for the partial pressure pm of the residual oxygen in the exhaust gas or its concentration. The residual oxygen can be monitored during a normal operating phase, the phase N. The lambda probe can be operated for test purposes, at times, particularly intermittently in a phase H or a phase L. In these operating phases H and L the oxygen partial pressure pi in the reaction chamber (24) adopts a largely minimum value or a largely maximum value. By means of changing between the named operating phases, by registering the pump current Ip and by comparing the registered pump currents Ip with empirical values, conclusions with regard to the ability of the probe to function (1) can be derived, so that if necessary, in the case of a lacking or faulty ability to function, measures can be introduced to remedy the deficiencies or to exchange the sensor (2).
摘要:
A drive apparatus (1) for a fire damper (2) having an electric drive (10), 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 (12) interrupts the power supply to the drive (10) at a melt temperature. The drive apparatus (1) also has a temperature sensor (13) for measuring the air temperature (T), a gas sensor (14) for measuring the content (G) of fumes in the air, and a switch module (15), 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 (12) is high, but already when smoke or gas develops as a result of the fire.
摘要:
The fuel cell battery (1) has an integrated heat exchanger (4) which is arranged between a heat insulating jacket (12) and a stack (10) of high temperature fuel cells (2). There is a chamber (3), preferably at least two chambers for afterburning, between a periphery (14) of the cell stack and the heat exchanger. The heat exchanger is provided for a heat transfer from an exhaust gas (7) to a gaseous oxygen carrier (5). There are arranged on the stack periphery (14), outside or inside the chamber or chambers respectively, inlet points (25a) for the oxygen carrier, on the one hand, and outlet points (25b, 26b) for non-converted educts, namely a fuel gas (6) and the oxygen carrier, on the other hand. The heat exchanger (4) includes a passage system (4) through which the exhaust gas (7) and the oxygen carrier (5) flow largely in transverse planes disposed perpendicular to the axis of the cell stack (10) in one operating state of the battery. The exhaust gas can be led off through axially directed collecting passages (47″) which are arranged in a peripheral region of the heat exchange. Parts of the heat exchanger, which are disposed between the peripheral region and the cell stack, form a shield for screening the cell stack from the collecting passages with respect to a thermal influence.