DE102015226187A1 - Room air conditioning method and room air conditioning device - Google Patents

Abstract

The invention relates to a room air conditioning method for conditioning at least one room, comprising the steps of: tempering (S1) supply air to an adjustable supply air temperature (Tluft) by a tempering device (201a); Directing (S2) the supply air into the at least one room with an adjustable volume flow (V) through a fan device (201b); Measuring (S3) a temperature difference (dT) between a room temperature (dream) or an exhaust air temperature (Tab) of the at least one room and the supply air temperature (Tluft); Calculating (S4) a dependence of a heat output (Pq), which is delivered by the supply air to the at least one room, of the temperature difference (dT) and the volume flow (V); Regulating (S5) the room temperature (dream) or exhaust air temperature (Tab) to a target temperature (Tsoll) by adjusting the heat output (Pq); Measuring (S6) a consumption power (Pv) which is supplied to a supply air device (201) comprising the temperature control device (201a) and the fan device (201b); and minimizing (S7) the consumption power (Pv) by varying the supply air temperature (Tluft) and volume flow (V) at a constant set heat output (Pq).

Description

The present invention relates to a room air conditioning method for air conditioning at least one room and a room air conditioning apparatus.

State of the art

In air conditioning systems in large, especially commercial buildings, an air, which is used for controlling the temperature of a room, tempered before blowing to a supply air temperature. In order to avoid low air temperatures and a draft risk, the supply air temperatures can generally not be lower than certain minimum values.

An air conditioning device is for example from the DE 196 54 542 A1 known.

Disclosure of the invention

However, since air conditioners can consume a great deal of energy, it is advantageous to design air conditioning devices as energy-efficient as possible.

The present invention discloses a room air conditioning method for air conditioning at least one room, with the features of claim 1 and a room air conditioning device with the features of claim 6.

The present invention accordingly provides a room air conditioning method for conditioning at least one room, comprising the steps of: controlling supply air to an adjustable supply air temperature by means of a temperature control device; Directing the supply air into the at least one room with an adjustable volume flow through a fan device; in particular measuring a temperature difference between a room temperature or an exhaust air temperature of the at least one room and the supply air temperature; in particular, calculating a dependence of a heat output, which is delivered by the supply air to the at least one room, of the temperature difference and the volume flow; Regulating the room temperature or exhaust air temperature to a set temperature by adjusting the heat output; Measuring a consumption power which is supplied to a supply air device, comprising the temperature control device and the fan device; and minimizing the consumption by varying the supply air temperature and flow rate at a constant set heat output.

The present invention accordingly further provides a room air conditioning device, comprising a supply air device for ventilating at least one room, with a temperature control device for controlling supply air to an adjustable supply air temperature, and a fan device for directing the supply air in the at least one room with an adjustable volume flow; a measuring device, which is in particular designed for measuring a temperature difference between a room temperature of the at least one room or an exhaust air temperature and the supply air temperature, and for measuring a consumption power, which is supplied to the air supply device; in particular a calculation device which is designed to calculate a dependence of a heat output, which is discharged by the fan device to the at least one room, from the temperature difference and the volume flow; and a control device, which is designed to control the room temperature or exhaust air temperature to a desired temperature by adjusting the heat output, and to minimize the power consumption by varying supply air temperature and flow rate at a constant set heat output.

Preferred developments are the subject of the respective subclaims.

Advantages of the invention

The room air conditioning method according to the invention thus takes into account both a consumption of the temperature control device and a consumption of the fan device. Depending on the heat output, the supply air temperature and the volume flow are therefore set to optimum values, so that the consumption of the air supply device is minimized. Thus, the given Zulufteinrichtung can therefore be operated very efficiently, whereby electricity costs can be saved.

According to a preferred development, the room air conditioning method comprises the further step of determining a family of characteristics of the air supply device by determining a dependence of the consumption power on the temperature difference and the volume flow, wherein the minimization of the consumption power is performed on the basis of the family of characteristics. On the basis of the family of characteristics, a minimum of the consumption power as a function of temperature difference and volume flow can be calculated easily and quickly, and the consumption power can be minimized thereby.

According to a preferred development of the room air conditioning method, the determination of the family of characteristics is performed by measuring value triples of the consumption power, the temperature difference and the volume flow. The Characteristic family is thus determined on the basis of empirical values.

According to a preferred embodiment, the room air conditioning method comprises the further steps of determining an efficiency of the temperature control device, and determining an efficiency of the fan device, wherein determining the characteristic family by calculating value triples of consumption power, temperature difference and volume flow based on the determined efficiency of the temperature control of the determined efficiency of Fan device is performed. In this case, in particular the characteristics of the tempering device and the fan device can be calculated, whereby the family of characteristics can be optimally determined. A minimum of the consumption power as a function of the supply air temperature and the volume flow can thus be determined quickly and efficiently.

According to a preferred development, the room air conditioning method comprises the further step of measuring value triples of the consumption power, the temperature difference and the volume flow, wherein the family of characteristics is modified on the basis of the measured value triples. The family of characteristics can thus be specified as an initial value and improved and adjusted by empirical measured values. The room air conditioning method is thus self-learning and the family of characteristics can be increasingly improved in the course of operation. In addition, changes that occur, for example, due to aging processes or changes to the air supply device can thus be included. In particular, the room air conditioning method can automatically adjust even with modifications of the air supply device.

According to a preferred development, the room air conditioning device comprises a determination device which is designed to determine a family of characteristics of the air supply device by determining a dependency of the consumption power on the temperature difference and the volume flow, wherein the control device is designed to minimize the consumption power based on the family of characteristics.

According to a preferred embodiment of the room air conditioning device, the determination device is designed to perform the determination of the family of characteristics based on measured value triples of consumption power, temperature difference and volume flow.

According to a preferred development, the room air conditioning device comprises a determination device which is designed to determine an efficiency of the temperature control device, and to determine an efficiency of the fan device, wherein the determination device is designed to determine the characteristic set by calculating value triples of consumption power, temperature difference and volume flow on the basis of determined efficiency of Temperierungseinrichtung and the determined efficiency of the fan device to perform.

According to a preferred development of the room air conditioning device, the minimization of the consumption power is carried out under the secondary condition that the supply air temperature and / or the volume flow are within predetermined value ranges.

In particular, it can thus be prevented that the supply air temperature is too low, whereby the occurrence of draft or too low local air temperatures in the at least one space can be prevented. By limiting the value range of the volume flow can also be prevented a draft risk, whereby the room air conditioning is designed consumer-friendly.

According to a preferred embodiment of the room air conditioning device, the measuring device is further configured to measure a humidity of the at least one room, wherein the minimization of the consumption power is performed under the constraint that the supply air temperature is varied only in a value range, so that the humidity of the at least one Room is not below a predetermined first humidity level and / or above a predetermined second humidity level. In particular in arid climatic regions, the supply air temperature and the volume flow can be adjusted such that the humidity is above the second predetermined humidity value, and thus a minimum humidity in the at least one room is not exceeded. Furthermore, there may be requirements for maximum humidity, for example in libraries or factories with sensitive devices or machines. The room air conditioning device can then prevent the humidity from exceeding a maximum humidity level.

Brief description of the drawings

Show it:

1 a flowchart for explaining a Raumklimatisierungsverfahrens invention for air conditioning of at least one room;

2 a block diagram of an embodiment of a room air conditioning device according to the invention;

3 a diagram for explaining a relationship between consumption and supply air temperature; and

4 a diagram explaining a relationship between supply air temperature and consumption.

In all figures, the same or functionally identical elements and devices - unless otherwise stated - provided with the same reference numerals. The numbering of method steps is for the sake of clarity and, in particular, should not, unless otherwise indicated, imply a particular chronological order. In particular, several method steps can be carried out simultaneously. Further, various embodiments may be arbitrarily combined with each other unless otherwise specified.

Description of the embodiments

1 FIG. 12 is a flowchart for explaining a room air conditioning method for air conditioning at least one room according to an embodiment of the present invention. The room air conditioning method can in particular with a in 2 illustrated room air conditioning device 200 be performed. The room air conditioning device 200 in this case comprises a Zulufteinrichtung 201 to ventilate at least one room. The Zulufteinrichtung 201 includes a tempering device 201 as well as a ventilation device 201b ,

In a first step S1, supply air is passed through the temperature control device 201 tempered to an adjustable supply air temperature T _air .

In a second step S2, the supply air through the fan device 201b directed with an adjustable volume flow V in the at least one room, wherein the volume flow is a measure of the volume of the supply air temperature per unit time.

The room air conditioning device 200 further includes a measuring device 202 , In a third step S3, the measuring device measures 202 a temperature difference dT between a room temperature T _room or an exhaust air temperature T _from the at least one room and the supply air temperature T _air . The measuring device 202 So either measures a temperature difference dT = T _room - T _air or dT = T _off - T _air. The exhaust air temperature in this case corresponds to a temperature of an exhaust air, which is sucked out of the room, wherein the exhaust air temperature T _ab substantially corresponds to the room temperature T _space of at least one room.

The room air conditioning device 200 further comprises a calculation device 203 , In a fourth step S4, the calculation device calculates 203 a dependence of a heat output P _q , which is discharged by the supply air to the at least one room, of the temperature difference dT and the volume flow V. The calculation device 203 calculates, for example, the heat output P _q according to the following formula: P _q = c × V × dT, where c is a constant.

Further, the room air conditioning apparatus includes 200 a control device 204 , The control device 204 regulates in a fifth step S5, the room temperature _Troom or the exhaust air temperature _T to a desired temperature T _set by adjusting the calculated heat power P _q. The control device 204 In this case, the heat output P _q varies in such a way that the room temperature T _{room is} regulated to the setpoint temperature T setpoint. The control device 204 controls the tempering device 201 and the fan device 201b and adjusts the values of the supply air temperature T _air and the volume flow V such that the consumption power P _v determined in the sixth step is minimal. Details will be explained with reference to step S7.

In a sixth step S6 measures the measuring device 202 a consumption power P _v , which of the Zulufteinrichtung 201 is supplied. The consumption power P _v is in this case composed of a first consumption power P _{v, 1} , which the temperature control device 201 is supplied and a second consumption power P _{v, 2} , which of the fan device 201b is supplied. The measuring device 202 Thus, the consumption power P _v is measured by measuring the first and second consumption power P _{v, 1} and P _{v, 2} according to the following formula: P _v = P _{v, 1} + P _{v, 2} .

In a seventh step S7, the controller minimizes 204 the consumption power P _v by varying the supply air temperature T _air and volume flow V at constant set heat output P _q . In this case, the heat output P _q depends on the temperature difference dT and the volume flow V calculated above, wherein the heat output P _q remains constant when the temperature difference dT changes by a factor x and the volume flow V is changed by a factor 1 / x , The heat output P _q is in this case set such that the room temperature _is regulated to the target temperature T _soll .

According to one embodiment, minimizing the consumption power P _v by varying supply air temperature T _air and volume flow V can be carried out with a gradient-based method. In this case, the control device changes the supply air temperature T _air by a factor x and the volume flow V by a factor of 1 / x by controlling the temperature control device 201 and the fan device 201b , wherein the change of the consumption power P _v by the measuring device 202 is measured simultaneously. If the consumption power P _{v increases} , then the control device is 204 designed to reverse the made change the supply air temperature T _air or the volume flow V. For example, if the control _{device has} increased the supply air temperature T _air , it is designed to reduce the supply air temperature T _air .

Conversely, if the consumption power P _v decreases, then the control device is 204 designed to change the supply air temperature T _air and the flow rate V further in the same direction until a minimum of the consumption power P _{v is} reached.

The control device 204 is here designed to the temperature control 201 to control the supply air to the determined supply air temperature T _air and the fan device 201b to control to direct the supply air in the at least one room with the determined volume flow V.

According to a further embodiment of the present invention, the room air conditioning method comprises a further step S8 of determining a family of characteristics of the air supply device 201 by determining a dependence of the consumption power P _v on the temperature difference dT and the volume flow V by a determination device 205 the room air conditioning device 200 , The determining device 205 thus measures a family of characteristic curves, that is to say functions P _v (dT, V; y), that is to say a dependence of the consumption power P _v on the temperature difference dT and the volume flow V, where y stands for further possible parameters. These further possible parameters may be, in particular, an ambient humidity of the at least one room, an ambient temperature of the at least one room, an occupancy or use of the building with the at least one room, a building standard of the building, solar irradiation and orientation to the at least one room and the target room. Temperature T _should include the space. This results in a family of characteristics, that is, for each parameter y a characteristic.

According to one embodiment, the family of characteristics may be performed by measuring value triples, that is, the consumption power P _v , the temperature difference dT and the volume flow V at different times. In this case, the value triplets can be carried out for different parameters y, and for each fixed parameter value y, a characteristic P _v (dT, v) is calculated, which together give the family of characteristics P _v (dT, v; y).

According to a further embodiment, prior to determining the family of characteristics in a step S7a, an efficiency x _{1 of} the tempering device 201 by a determination unit 206 the room air conditioning device 200 be determined. Next, in a step S7b, an efficiency x _{2 of} the fan device 201b by the determination device 206 determined. The efficiency x _{1 of} the tempering device 201 is here by the quotient of heat output P _q and the first consumption power P _{v, 1 of} the temperature control 201 given, ie x ₁ = P _q / P _{v, 1} , and the efficiency x _{2 of} the fan device 201b is by the quotient of volume flow V and the second consumption power P _{v, 2 of} the fan device 201b given, ie x ₂ = V / P _{v, 2} . The determination device 206 can the efficiency x _{1 of} the temperature control 201 depending on a used installation technology of the room air conditioning device 200 , an ambient temperature of the at least one room, the supply air temperature T _air , a solar radiation and orientation of the sun on the at least one room and a building standard calculated. The determination unit 206 can the efficiency x _{2 of} the fan device 201b as a function of the volume flow V, a back pressure of the fan device 201b , a pressure drop of the fan device 201b , a construction standard of the fan device 201b and calculate properties of a heat exchanger for transferring the cooling capacity to the supply air.

The determining device 205 is configured to determine the family of characteristics by calculating value triples of consumption power P _v , temperature difference dT and volume flow V on the basis of the determination device 206 determined efficiency x _{1 of} the temperature control device 201 and that of the investigator 206 determined efficiency x _{2 of} the fan device 201b perform.

The control device 204 is further configured to perform the minimization of the consumption power P _v based on the determined according to one of the methods described above family of characteristics.

According to a further embodiment, the determination device 205 be designed to use the determined family of characteristics as the initial value and using value triples on the consumption power P _v , the temperature difference dT and the flow rate V, which from the measuring device 202 be measured to modify the family of characteristics. The room air conditioning device 200 is thus self-learning.

In 3 is a diagram for explaining the relationship of consumption power P _v and supply air temperature T _air illustrated. The parameter y of the family of characteristics takes on each of the three characteristics 301 . 302 . 303 each one fixed value, but the parameter for the three characteristics 301 . 302 . 303 different. The characteristics 301 to 303 may differ, for example, by a different ambient temperature or a different occupancy or use of the at least one room. Next is the heat required power P _q to the at least one room to the desired temperature T _should be regulated, fixed. According to the formula given above, the volume flow V can thus be expressed as a function of the temperature difference dT. If the dependence of the volume flow V on the temperature difference dT in the respective characteristic curve P _v (dT, V) is used, this results in a consumption power P _v , which depends only on the temperature difference dT. At constant room temperature T _raum , the dependence on the temperature difference dT can be equivalently expressed as a function of the supply air temperature T _air . The consumption power P _v thus depends only on the supply air temperature, as in 3 illustrated. The control device 204 is thus designed for a given, in particular measured parameter y the corresponding characteristic 301 to 303 to select and to minimize the consumption power P _v . For the first consumption 301 results in a first temperature T ₁ = 13 °, for the second consumption 302 results in a second supply air temperature T ₂ = 17.5 °, in which the consumption power P _{v is} minimized. According to a further embodiment, the minimization of the consumption power P _v can be carried out under the constraint that the supply air temperature T _{air is} in a range of values 304 between a minimum supply air temperature T _min = 12 ° C and a maximum supply air temperature T _max = 20 ° C. For the third characteristic 303 the consumption P _v becomes within the permissible value range 304 for a third temperature T ₃ = 20 ° C minimized, which at the edge region of the value range 304 lies.

According to a further embodiment, the minimization of the consumption power P _{v can} also be carried out under the secondary condition that the permissible volume flow V lies in a predetermined value range.

According to a further embodiment, the measuring device 202 be designed to measure a moisture F of the at least one space.

The minimization of the consumption power P _v is carried out under the constraint that the supply air temperature T _air is varied only in a range of values, so that the humidity F of the at least one room is not below a predetermined first humidity value F ₁ and / or above a predetermined second humidity value F ₂ lies.

4 shows a diagram for explaining a relationship of the supply air temperature T _air and the consumption power P _q . In 4 should continue to regulate the room temperature T _room or exhaust air temperature T _ab to a desired temperature T _soll required heat output P _q change with time, that is, be time-dependent. For each value of the heat output P _q , a corresponding supply air temperature T _{air is} calculated, and via the calculated dependence of the heat output P _q on the temperature difference dT and the volume flow V, also the volume flow V. In 4 Here are three curves 401 . 402 and 403 drawn, which differ by different parameters y. The control device 204 is thus designed to minimize the consumption power P _v by determining the corresponding supply air temperature T _air based on the characteristic curve for the heat output P _q and the tempering device 201 controlled to temper the supply air to the determined supply air temperature T _air .

The permissible values of the supply air temperature T _air lie within a range of values 405 which by a limitation 404 is limited.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 19654542 A1 [0003]

Claims (11)

Room air conditioning method for conditioning at least one room, comprising the steps of: tempering (S1) supply air to an adjustable supply air temperature (T _air ) by a temperature control device ( 201 ); Conducting (S2) the supply air into the at least one room with an adjustable volume flow (V) through a fan device ( 201b ); Controlling (S5) a room temperature (T _room ) or an exhaust air temperature (T _ab ) to a target temperature (T _soll ) by setting a heat output (P _q ), which is delivered by the supply air to the at least one room; Measuring (S6) a consumption power (P _v ), which a Zulufteinrichtung ( 201 ), comprising the tempering device ( 201 ) and the fan device ( 201b ) is supplied; and minimizing (S7) the consumption power (P _v ) by varying the supply air temperature (T _air ) and the volume flow (V) at a constant set heat output (P _q ). The room air conditioning method according to claim 1, further comprising at least one of the steps of: measuring (S3) a temperature difference (dT) between the room temperature (T _room ) or the exhaust air temperature (T _ab ) of the at least one room and the supply air temperature (T _air ); and / or calculating (S4) the heat output (P _q ) as a function of the temperature difference (dT) and the volume flow (V); and / or determining (S8) a characteristic set of the feeder device ( 201 by determining a dependence of the consumption power (P _v ) on the temperature difference (dT) and the volume flow (V), wherein the minimization of the consumption power (P _v ) is performed on the basis of the family of characteristics. The room air conditioning method according to claim 2, wherein the determining of the family of characteristics is performed by measuring value triples of the consumption power (P _v ), the temperature difference (dT) and the volume flow (V). Room air conditioning method according to claim 2, further comprising the steps of: determining (S7a) an efficiency (x ₁ ) of the temperature control device ( 201 ); and determining (S7b) an efficiency (x ₂ ) of the fan device ( 201b ); wherein determining the family of characteristics by calculating value triples of consumption power (P _v ), temperature difference (dT) and volume flow (V) based on the determined efficiency (x ₁ ) of the temperature control device ( 201 ) of the determined efficiency (x ₂ ) of the fan device ( 201b ) is carried out. The room air conditioning method according to claim 4, further comprising the step of: measuring (S9) value triples of the consumption power (P _v ), the temperature difference (dT) and the volume flow (V); wherein the family of characteristics is modified on the basis of the measured value triples. Room air conditioning device ( 200 ), with a feeder device ( 201 ) for ventilating at least one room, with a tempering device ( 201 ) for controlling the supply air to an adjustable supply air temperature (T _air ), and a fan device ( 201b ) for directing the supply air into the at least one room with an adjustable volume flow (V); a measuring device ( 202 ), which for measuring a consumption power (P _v ), which of the Zulufteinrichtung ( 201 ) is supplied, is formed; and a control device ( 204 ), which is designed to control a room temperature (T _raum ) or an exhaust air temperature (T _ab ) to a desired temperature (T _soll ) by setting a heat output (P _q ), which by the fan device ( 201b ) is delivered to the at least one room and to minimize the consumption power (P _v ) by varying the supply air temperature (T _air ) and flow (V) at a constant set heat output (P _q ). Room air conditioning device ( 200 ) according to claim 6, with the measuring device ( 202 ), which is designed to measure a temperature difference (dT) between the room temperature (T _raum ) of the at least one room or the exhaust air temperature (T _ab ) and the supply air temperature (T _air ); and / or a calculation device ( 203 ), which is designed to calculate a dependence of the heat output (P _q ) on the temperature difference (dT) and the volume flow (V); and / or a determination device ( 205 ), which is designed to determine a family of characteristics of the air supply device ( 201 by determining a dependence of the consumption power (P _v ) on the temperature difference (dT) and the volume flow (V), wherein the control device ( 204 ) is configured to perform minimizing the consumption power (P _v ) based on the family of characteristics. Room air conditioning device ( 200 ) according to claim 7, wherein the determining device ( 205 ) is designed to perform the determination of the family of characteristics based on measured value triples of consumption power (P _v ), temperature difference (dT) and volume flow (V). Room air conditioning device ( 200 ) according to claim 7, with a determination device ( 206 ), which is designed to determine an efficiency (x ₁ ) of the tempering device ( 201 ) and for determining an efficiency (x ₂ ) of the fan device ( 201b ); wherein the determining device ( 205 ), the determination of the family of characteristics by calculating value triples of consumption power (P _v ), temperature difference (dT) and volume flow (V) on the basis of the determined efficiency (x ₁ ) of the temperature control device ( 201 ) and the determined efficiency (x ₂ ) of the fan device ( 201b ). Room air conditioning device ( 200 ) according to one of claims 6 to 9, wherein the minimization of the consumption power (P _v ) is carried out under the constraint that the supply air temperature (T _air ) and / or the volume flow (V) are within predetermined value ranges. Room air conditioning device ( 200 ) according to one of claims 6 to 10, wherein the measuring device ( 202 ) is further adapted to measure a humidity (F) of the at least one space; and wherein the minimization of the consumption power (P _v ) is carried out under the constraint that the supply air temperature (T _air ) is varied only in a value range such that the humidity (F) of the at least one space does not fall below a predetermined first humidity value (F ₁ ) and / or above a predetermined second humidity value (F ₂ ).

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