JP2013174372A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner capable of reducing a frequency of undershooting or a frequency of overshooting of a room temperature and suppressing increase in fuel cost.SOLUTION: A hot-air heater 1 which uses heat generated by burning wood pellets by an electric heater includes a room temperature sensor 40 for detecting a room temperature and a control device 50. The control device 50 calculates a room temperature changing gradient from the room temperature detected by the room temperature sensor 40 when stopping an operation, and on the basis of the calculated changing gradient, predicts time until the room temperature reaches a target preset temperature Ts as a prediction time Te. The control device 50 starts ignition control of the wood pellets by the electric heater when the prediction time Te becomes set time ts1 or less.

Description

  The present invention relates to an air conditioner.

  2. Description of the Related Art Conventionally, for example, a warm air machine that is applied to a house that grows crops and the like in a certain range of temperature environment during heating is known as one of air conditioners (see, for example, Patent Document 1). Moreover, what used the wood pellet for the fuel as such a warm air machine is proposed. Wood pellets are small solid fuels that are compression-molded from sawdust and by-products such as kana scrap. By using such wood pellets as fuel, it is possible to use unwanted materials such as sawdust and kana scrap as fuel, which is advantageous in terms of cost and environment (see Patent Document 2).

JP-A-2-15629 JP 2011-185569 A

  However, when wood pellets are burned by an electric heater, it takes a certain amount of time from the ignition control of the electric heater to the burning of the wood pellets, so the temperature in the house room may undershoot. For example, in the case of controlling the temperature so that the room does not fall below T1 ° C due to crops, etc., even if the ignition control of the electric heater is performed when the room temperature gradually decreases and reaches T1 ° C, the wood pellets The room temperature will fall below T1 ° C. and will undershoot before it burns.

  Therefore, even if ignition control of the electric heater is performed at a room temperature such as T2 ° C. higher than T1 ° C., the fuel cost increases. That is, in such a case, it is necessary to increase the set temperature itself, and the temperature in the house room is increased and stabilized, so that the fuel cost increases.

  Note that this problem is not limited to room temperature undershoot, but is also a common problem with room temperature overshoot during cooling operation. Is a common problem.

  The present invention has been made to solve such a conventional problem, and an object of the present invention is to reduce the frequency at which the room temperature undershoots or overshoots and to increase the fuel cost. It is providing the air conditioner which can be suppressed.

  The air conditioner of the present invention uses the heat generated by burning wood pellets with an electric heater for room temperature control, and includes a room temperature sensor for detecting the room temperature and a room temperature detected by the room temperature sensor when the operation is stopped. A gradient calculating means for calculating a change gradient of the room temperature from the time, an arrival time predicting means for predicting, as a predicted time, a time until the room temperature reaches a preset target temperature based on the change gradient calculated by the gradient calculating means; When the predicted time calculated by the arrival time predicting means is less than the set time set based on the time required for the electric heater to burn the wooden pellet, the ignition control of the wooden pellet by the electric heater is started. And a control means.

  According to this air conditioner, since the change gradient of the room temperature is calculated, it is possible to grasp how much the room temperature is changing, and until the room temperature reaches a preset target temperature based on the change gradient. Therefore, it is possible to calculate a predicted time with a certain degree of accuracy from the change gradient. And when this estimated time becomes below the setting time set based on the time required for an electric heater to burn a wood pellet, the ignition control of the wood pellet by an electric heater is started. For this reason, the ignition control of the wood pellet by the electric heater is started, and when the wood pellet actually burns, the room temperature is close to the target temperature, and the frequency at which the room temperature undershoots or overshoots can be reduced. it can. Further, it is not necessary to stabilize the room temperature at a higher or lower temperature. Therefore, it is possible to reduce the frequency at which the room temperature undershoots or overshoots, and to suppress an increase in fuel cost.

  The air conditioner preferably further includes an outdoor sensor that detects the outdoor temperature, and a time correction unit that corrects the set time according to the outdoor temperature detected by the outdoor sensor.

  According to this air conditioner, the set time is corrected according to the outdoor temperature. For this reason, for example, even when the room temperature is lowered or raised earlier due to the influence of the outdoor temperature, an appropriate time can be set as the set time. Thereby, undershoot or overshoot can be further prevented.

  Further, in this air conditioner, the control means executes control in at least two modes, a low load mode and a high load mode, depending on the size of the heating load or the cooling load, and starts operation in the low load mode from the operation stop state. In doing so, it is preferable to start the ignition control of the wood pellet by the electric heater when the predicted time becomes equal to or shorter than the set time.

  According to this air conditioner, when starting the operation in the low load mode from the operation stop state, the ignition control of the wood pellets by the electric heater is started when the predicted time is equal to or shorter than the set time. Thus, the predicted time is determined at the start of operation in the low load mode from the operation stop state. Here, it takes a relatively long time to burn the wood pellets from the state where the wood pellets are not burned by the electric heater, but it takes a relatively long time to increase the combustion amount from the state where the wood pellets are already burned. Is not required. Therefore, by performing the above-described control from the time when the operation is stopped to the time when the operation in the low load mode is started, it is possible to perform a control in accordance with the combustion of the wood pellets.

  In the above, the low load mode is an operation mode when the heating load or the cooling load is about 50%, and the high load mode is the heating load or the cooling load is about 100%. This is an operation mode that starts at a certain time.

  ADVANTAGE OF THE INVENTION According to this invention, while reducing the frequency which room temperature undershoots or overshoots, the air conditioner which can suppress the increase in fuel cost can be provided.

It is a lineblock diagram showing an example of a heating system containing a warm air machine concerning this embodiment. It is a schematic block diagram of the warm air machine which concerns on this embodiment. It is the block diagram which showed typically the warm air system containing the warm air machine which concerns on this embodiment. It is a figure which shows the control method of the warm air machine which concerns on a comparative example. It is a figure which shows the displacement and combustion state of room temperature by the warm air machine which concerns on a comparative example, Comprising: (a) shows the displacement of room temperature, (b) has shown the combustion state. It is a 1st figure which shows the ignition control of the electric heater which concerns on this embodiment. It is a 2nd figure which shows the ignition control of the electric heater which concerns on this embodiment. It is a figure which shows the control method of the warm air machine which concerns on this embodiment. It is a block diagram which shows an example of the air conditioner which concerns on this embodiment, Comprising: The example in case an air conditioner is an absorption-type cold / hot water machine is shown. It is a functional block diagram which shows the detail of the control apparatus shown in FIG.

  Preferred embodiments of the present invention will be described below with reference to the drawings. However, the present invention is not limited to the following embodiments. In the following description, a warm air machine is described as an example of an air conditioner. However, the air conditioner is not limited to a warm air machine, and may be an air conditioner capable of only cooling or an air conditioner capable of air conditioning. May be. In addition, in the following, since a heater that performs a heating operation will be described as an example, one purpose is to reduce the frequency at which the room temperature undershoots, but the room temperature overshoots during cooling operation. It goes without saying that reducing the frequency is one of the purposes.

  FIG. 1 is a configuration diagram illustrating an example of a heating system including a hot air fan according to the present embodiment, and FIG. 2 is a schematic configuration diagram of the hot air fan according to the present embodiment. As shown in FIG. 1 and FIG. 2, the wood pellet fuel in which wood biomass fuel is formed into pellets is stored in a wood pellet tank 3 installed outside the greenhouse 7. The wood pellet fuel is cut out from the bottom of the wood pellet tank 3 and transported to the warm air machine 1 installed in the greenhouse 7 by the transport device 5. The wood pellet fuel is introduced into the combustor 9 in the warm air machine 1 and burned together with combustion air supplied from a blower (not shown) attached to the warm air machine 1.

  The combustor 9 includes an electric heater, and the wood pellet is burned by the electric heater. Combustion exhaust gas generated by burning wood pellets reaches the chimney 13 from the furnace tube 11 in the warm air blower 1 and is emitted from the chimney 13 to the outside of the greenhouse 7. The air in the greenhouse 7 is taken into the hot air blower 1 from the two air intakes 19 provided with the blower 17 at the upper part of the hot air blower 1, as indicated by an arrow 15, After being heated by heat exchange, the air is exhausted in the direction of the arrow 23 into the greenhouse 7 from the air discharge port 21 formed on the opposite side surface of the warm air fan 1, and the inside of the greenhouse 7 is heated.

  FIG. 3 is a block diagram schematically showing a warm air system including the warm air machine 1 according to the present embodiment. As shown in FIG. 3, the warm air machine 1 according to the present embodiment includes a room temperature sensor 40 and a control device 50 in addition to the above configuration. The room temperature sensor 40 detects the room temperature in the greenhouse 7. The control device 50 includes a control unit (control means) 51, and controls the warm air fan 1 according to the room temperature detected by the room temperature sensor 40. The control device 50 is configured by a CPU (Central Processing Unit) or the like.

  Here, with reference to FIG. 4, control of the warm air machine which concerns on a comparative example is demonstrated. FIG. 4 is a diagram illustrating a method of controlling the hot air fan according to the comparative example. In the example shown in FIG. 4, the target temperature, that is, the room temperature set by the user is 15 ° C.

  As shown in FIG. 4, it is first assumed that the combustion of the hot air blower is stopped (off). Then, when the room temperature detected by the room temperature sensor decreases and reaches 14.5 ° C., the control unit starts the operation of the hot air fan (Low operation). Here, the control unit starts the operation of the warm air fan in the low load mode. The low load mode is an operation mode when the size of the heating load is about 50%.

  Further, when the room temperature detected by the room temperature sensor reaches 15.5 ° C. in the low load mode, the control unit stops the operation of the hot air fan (off). On the other hand, when the room temperature detected by the room temperature sensor reaches 10 ° C. in the low load mode, the control unit shifts the operation mode to the high load mode (Hi operation). Here, the high load mode is an operation mode started when the size of the heating load is about 100%.

  When the room temperature detected by the room temperature sensor rises to 15.5 ° C. in the high load mode, the control unit causes the warm air fan to perform a low operation in the high load mode (low operation). Further, in this state, when the room temperature detected by the room temperature sensor decreases to 14.5 ° C., the control unit causes the hot air fan to perform a Hi operation in a high load mode (Hi operation).

  In addition, the control unit according to the comparative example performs time integration to control the operation of the hot air fan. That is, it is assumed that the room temperature detected by the room temperature sensor in the low load mode Low operation is within the range of 12 ° C to 14.5 ° C. At this time, the control unit integrates the room temperature over time, and switches the operation mode to the high load mode (Hi operation) when the time integrated value reaches the first specified value. The control unit integrates the value obtained from (room temperature-14.5 ° C.) with time, but is not limited to 14.5 ° C., and may be another temperature.

  Similarly, it is assumed that the room temperature detected by the room temperature sensor in the low load operation in the high load mode is within the range of 15.5 ° C. to 18 ° C. At this time, the control unit time-integrates the room temperature, and stops the operation when the time-integrated value reaches the second specified value (off). The control unit integrates the value obtained by (room temperature-15.5 ° C.) with time, but is not limited to 15.5 ° C., and may be another temperature.

  As described above, the control unit according to the comparative example executes control according to the room temperature detected by the room temperature sensor. At this time, the control unit executes control in at least two modes of a low load mode and a high load mode depending on the size of the heating load.

  However, in the hot air machine according to the comparative example, the room temperature undershoots more than the target temperature. FIGS. 5A and 5B are diagrams showing a room temperature displacement and a combustion state by a hot air blower according to a comparative example. FIG. 5A shows a room temperature displacement, and FIG. 5B shows a combustion state.

  First, at time 0, the warm air fan has stopped operating. For this reason, the room is cooled by the outside air temperature, and the room temperature decreases (see FIG. 5A). If the room temperature reaches 14.5 ° C. at time t1 (see FIG. 5A), the control unit starts operation in the low load mode as described with reference to FIG. 4 (FIG. 5). (See (b)).

  However, when wood pellets, which are fuel, are burned by an electric heater, it takes time from the ignition control of the electric heater to the wood pellets burning. Then, the room is cooled by the outside air temperature during this time, and the room temperature is further lowered, and the room temperature is considerably lowered as compared with the target temperature of 15 ° C. (see FIG. 5A).

  Thereafter, the wood pellets are sufficiently burned at time t2 and the room is warmed, so that the room temperature rises (see FIG. 5A). The room temperature reaches 15.5 ° C. at time t3. Thereby, a control part will stop the driving | operation of a warm air machine (refer FIG.5 (b)). The reason why the temperature rises slightly above 15.5 ° C. after time t3 is due to preheating of the wood pellets.

  Thereafter, the room is cooled again by the outside air temperature, and at time t4, the control unit starts operation in the low load mode (see FIG. 5B). Thereafter, the above operation is repeated.

  Thus, in the comparative example, there was a problem that the room temperature undershooted during the time t1 to t2 and in the time zone after the time t4. Then, the warm air machine 1 which concerns on this embodiment suppresses the undershoot of room temperature by providing the following structures.

  Refer to FIG. 3 again. As shown in FIG. 3, the control device 50 includes a gradient calculation unit (gradient calculation unit) 52 and an arrival time prediction unit (arrival time prediction unit) 53.

  The gradient calculation unit 52 calculates a decrease gradient (change gradient) of the room temperature from the room temperature detected by the room temperature sensor 40 when the operation is stopped. That is, when the operation is stopped, the room temperature decreases due to the influence of the outside air temperature. The gradient calculation unit 52 calculates the degree of decrease. The arrival time predicting unit 53 predicts the time until the room temperature decreases (reaches) to a preset target temperature based on the decreasing gradient calculated by the gradient calculating unit 52.

  By providing such a configuration, the control unit 51 starts ignition control of the wood pellet by the electric heater (that is, ignition of the electric heater) based on the time predicted by the arrival time prediction unit 53. . At this time, the control unit 51 starts the ignition control of the wood pellet by the electric heater when the predicted time becomes equal to or shorter than the set time. Here, the set time is a time set based on the time required for the electric heater to burn the wood pellet, and specifically, in addition to the time required for the electric heater to burn the wood pellet. The time is calculated in advance from the size of the room to be heated, the heating capacity of the warm air fan 1, and the like.

FIG. 6 is a first diagram illustrating ignition control of the electric heater according to the present embodiment. As shown in FIG. 6, it is assumed that the current room temperature is T _R ° C. and the operation of the warm air fan 1 is stopped, so that the room temperature is decreasing. At this time, the gradient calculation unit 52 calculates a decrease gradient of the room temperature from the room temperature detected by the room temperature sensor 40. Specifically, the decreasing gradient can be expressed by dT _R / dt.

Next, the arrival time predicting unit 53 predicts a time (hereinafter referred to as a predicted time _Te ) until the room temperature decreases to a preset target temperature T _S based on the decreasing gradient calculated by the gradient calculating unit 52. . Specifically, the predicted time T _e can be represented by T _e = (T _R −T _S ) / (dT _R / dt).

Here, in the case of the example shown in FIG. 6, the predicted time T _e is clearly longer than the set time t _S1 . Therefore, even if the electric heater was ignited at present, without the room temperature drops to the target temperature T _e, becomes the room temperature begins to rise, resulting in a waste of fuel costs.

FIG. 7 is a second diagram illustrating ignition control of the electric heater according to the present embodiment. As shown in FIG. 7, it is assumed that the current room temperature is T _R ° C. and the operation of the warm air fan 1 is stopped, and therefore the room temperature is decreasing. At this time, as described above, the predicted time T _e is T _e = (T _R −T _S ) / (dT _R / dt).

Further, in the example shown in FIG. 7, the estimated time T _e becomes the same as the set time t _S1. For this reason, when the electric heater is ignited at the present time, for example, when the room temperature reaches the target temperature T _S , the wood pellets are sufficiently burned, and an undershoot at room temperature can be prevented.

FIG. 3 will be referred to again. As shown in FIG. 3, the warm air fan 1 includes an outdoor sensor 60, and the control device 50 includes a time correction unit (time correction unit) 54. The outdoor sensor 60 detects the outdoor temperature of the house, and outputs a signal corresponding to the outdoor temperature. The time correction unit 54 corrects the set time t _S1 according to the outdoor temperature detected by the outdoor sensor 60. Here, in the actual usage environment of the hot air fan, the room temperature may decrease early due to the extremely low outdoor temperature. In such a case, if the set time t _S1 is fixed, the room temperature may undershoot. Therefore, by correcting the set time t _S1 according to the outdoor temperature, an appropriate time can be set to the set time t _S1, and undershoot can be further prevented.

For example, the time correction unit 54 corrects the set time t _{S1 to} be short when the difference between the target temperature T _S and the outside air temperature is equal to or higher than a predetermined temperature (for example, 10 ° C.), and sets otherwise. Correction is made so that the time t _S1 becomes longer. The correction amount may be so determined according to the temperature difference between the target temperature T _S and the outside air temperature, or may be a fixed value.

Thus, in the present embodiment, the set time t _S1 may be the time itself required for the electric heater to burn the wood pellets and the room temperature to rise, or the time is corrected from factors such as the outside air temperature. It can be said that it may be the time.

Next, operation | movement of the warm air machine 1 which concerns on this embodiment is demonstrated. FIG. 8 is a diagram illustrating a method for controlling the warm air fan 1 according to the present embodiment. In the example illustrated in FIG. 8, an example is shown in which the target temperature T _S , that is, the room temperature set by the user is 15 ° C.

As shown in FIG. 8, it is assumed that the combustion of the warm air fan 1 is stopped (off). Then, when the room temperature detected by the room temperature sensor 40 decreases and reaches A ° C., the control unit 51 starts the operation of the warm air fan 1 in the low load mode (Low operation). Here, the A ° C., a temperature at which the predicted time T _e calculated becomes set time t _S1 following the arrival time prediction unit 53, corresponding temperature T _R shown in FIG. 7, for example.

  In addition, when the room temperature detected by the room temperature sensor 40 reaches 17 ° C. in the low load mode, the control unit 51 stops the operation of the hot air fan 1 (off). On the other hand, when the room temperature detected by the room temperature sensor 40 in the low load mode reaches 13 ° C., the control unit 51 shifts the operation mode to the high load mode (Hi operation).

  Further, when the room temperature detected by the room temperature sensor 40 in the high load mode rises to 16 ° C., the control unit 51 causes the warm air blower 1 to perform a low operation in the high load mode (low operation). Further, in this state, when the room temperature detected by the room temperature sensor 40 is lowered to 15 ° C., the control unit 51 causes the hot air fan 1 to perform a Hi operation in the high load mode (Hi operation).

  In addition, the control unit 51 according to this embodiment performs time integration to control the operation of the warm air fan 1. That is, it is assumed that the room temperature detected by the room temperature sensor 40 in the low load mode Low operation is within the range of 14 ° C. to 15 ° C. At this time, the control unit 51 integrates the room temperature over time, and switches the operation mode to the high load mode when the time integrated value reaches the first predetermined value (Hi operation). In addition, although the control part 51 carries out the time integration of the value obtained by (room temperature -15 degreeC), it is not restricted to 15 degreeC in particular, and may be another temperature.

  Similarly, it is assumed that the room temperature detected by the room temperature sensor 40 in the low operation in the high load mode is within a range of 17 ° C. to 18 ° C. At this time, the control unit 51 integrates the room temperature over time, and stops the operation when the time integrated value reaches the second predetermined value (off). In addition, although the control part 51 carries out the time integration of the value obtained by (room temperature -17 degreeC), it is not restricted to 17 degreeC especially, and another temperature may be sufficient.

Thus, in the present embodiment, the control unit 51 performs control according to the room temperature detected by the room temperature sensor 40. At this time, the control unit 51 executes control in at least two modes of a low load mode and a high load mode depending on the size of the heating load. In addition, when starting the operation in the low load mode from the operation stop state, the control unit 51 starts the ignition control of the wood pellet by the electric heater when the predicted time _Te becomes the set time t _S1 or less. On the other hand, when the wood pellets are already burned (that is, when the operation is performed other than when the operation is stopped), the control unit 51 performs the control without comparing the predicted time _Te with the set time t _S1. It will be.

Thus, according to the warm air fan 1 which concerns on this embodiment, since the fall gradient of room temperature is calculated, it can be grasped | ascertained to what extent room temperature is falling, and room temperature is based on a fall gradient. Is predicted to decrease to the preset target temperature T _S , it is possible to calculate the prediction time _Te with a certain degree of accuracy from the decrease gradient. Then, the estimated time T _e is, when the electric heater is turned on set time t _S1, which is set based on the time required following up the combustion of wood pellets to start ignition control of woody pellets according to the electric heater. Therefore, to start the ignition control of wood pellets with electric heater, when actually wood pellets are burned, the room temperature has become a near the target temperature T _S, it is possible to reduce the frequency of room temperature result in undershoot . Moreover, it is not necessary to stabilize the room temperature at a high temperature. Therefore, it is possible to reduce the frequency at which the room temperature undershoots and to suppress an increase in fuel cost.

Further, the set time t _S1 is corrected according to the outdoor temperature. For this reason, for example, even when the room temperature is lowered early due to the influence of the outdoor temperature, an appropriate time can be set as the set time t _S1 . Thereby, undershoot can be further prevented.

Further, when starting the operation in the low load mode from the operation stop state, when the predicted time _Te becomes equal to or less than the set time t _S1 , the ignition control of the wood pellet by the electric heater is started. Thus, the predicted time _Te is determined at the start of operation in the low load mode from the operation stop state. Here, it takes a relatively long time to burn from a state where the wood pellets are not burned by the electric heater, but it takes a relatively long time to increase the combustion amount from the state where the wood pellets are already burned. I don't need it. Therefore, by performing the above-described control from the time when the operation is stopped to the time when the operation in the low load mode is started, it is possible to perform a control in accordance with the combustion of the wood pellets.

  As described above, the present invention has been described based on the embodiment, but the present invention is not limited to the above embodiment, and may be modified without departing from the gist of the present invention. For example, various configurations and the like in the warm air fan 1 according to the present embodiment are not limited to those illustrated.

In addition, a plurality of set times t _S1 corresponding to the size are stored in advance in the control unit 51 so that the warm air fan 1 according to the present embodiment can be applied to a room of various sizes, and the warm air fan 1 is installed. It is sometimes preferred that one can be selected from a plurality of set times t _S1 .

  In addition, in the said embodiment, although the warm air machine which can output only warm air was demonstrated as an example of an air conditioner, not only this but the air conditioner of this invention may be an absorption cold / hot water machine. FIG. 9 is a configuration diagram illustrating an example of an air conditioner according to the present embodiment, and illustrates an example in which the air conditioner is an absorption chiller / heater.

  As shown in FIG. 9, the absorption chiller / heater 2 includes a high temperature regenerator 110, a separator 112, a low temperature regenerator 114, a condenser 116, an evaporator 118, an absorber 120, a solution circulation pump 122, a high temperature and a low temperature solution. The heat exchangers 124 and 126 are provided, and an absorption refrigeration cycle is configured by connecting these pipes.

  The high-temperature regenerator 110 includes, for example, water serving as a refrigerant (hereinafter, the refrigerant vaporized is referred to as refrigerant vapor, and the refrigerant liquefied is referred to as liquid refrigerant), and lithium bromide (LiBr) serving as an absorption liquid. Is used to heat a dilute solution (solution having a low concentration of the absorbing solution). The high temperature regenerator 110 is provided with a combustion device 110a. The combustion device 110a is configured to heat the dilute solution by burning the wood pellets with an electric heater. The high-temperature regenerator 110 generates refrigerant vapor and an intermediate concentrated solution (a solution having a medium concentration of absorbing solution) by heating the diluted solution to release the vapor from the diluted solution. The high temperature regenerator 110 supplies the refrigerant vapor and the intermediate concentrated solution to the separator 112.

  The separator 112 separates the refrigerant vapor and the intermediate concentrated solution. The separator 112 supplies the separated intermediate concentrated solution to the high temperature solution heat exchanger 124 and supplies the separated refrigerant vapor to the low temperature regenerator 114.

  The high-temperature solution heat exchanger 124 exchanges heat between the intermediate concentrated solution supplied from the separator 112 and the dilute solution sent from the absorber 120 by the solution circulation pump 122. The high-temperature solution heat exchanger 124 supplies the intermediate concentrated solution whose temperature has been lowered by heat exchange to the low-temperature regenerator 114.

  The low-temperature regenerator 114 exchanges heat between the intermediate concentrated solution whose temperature has decreased due to heat exchange and the refrigerant vapor supplied from the separator 112. In this low-temperature regenerator 114, the intermediate concentrated solution is reheated, and the vapor is discharged again to become a concentrated solution having a high concentration. The low temperature regenerator 114 supplies the concentrated solution to the low temperature solution heat exchanger 126 and supplies the refrigerant vapor to the condenser 116.

  The condenser 116 liquefies the refrigerant vapor supplied from the low temperature regenerator 114. A heat transfer tube 16 a is inserted into the condenser 116. Cooling water is supplied to the heat transfer tube 16a, and the evaporated refrigerant vapor is liquefied by the cooling water in the heat transfer tube 16a. Further, the condenser 116 supplies the liquefied refrigerant to the evaporator 118.

  The evaporator 118 evaporates the liquid refrigerant. In the evaporator 118, a liquid refrigerant distributor 18a and a heat transfer tube 18b are provided. The liquid refrigerant distributor 18a introduces the liquid refrigerant supplied from the evaporator 118 and spreads the liquid refrigerant toward the heat transfer pipe 18b.

  The heat transfer pipe 18b is connected to the indoor unit, and water warmed by cooling by the indoor unit flows. Further, the inside of the evaporator 118 is in a substantially vacuum state. For this reason, the evaporating temperature of the water which is a refrigerant | coolant will be about 5 degreeC. Therefore, the liquid refrigerant falling on the heat transfer tube 18b evaporates depending on the temperature of the heat transfer tube 18b. Further, the temperature of the water in the heat transfer tube 18b is deprived by the evaporation of the liquid refrigerant. Thereby, the water in the heat exchanger tube 18b is supplied to the indoor unit as cold water, and the indoor unit supplies cold air to the room using the cold water.

  The evaporator 118 is provided adjacent to the absorber 120 through a partition, and the evaporated refrigerant is supplied to the absorber 120 through the partition.

  The low temperature solution heat exchanger 126 exchanges heat between the concentrated solution warmed in the low temperature regenerator 114 and the dilute solution sent from the absorber 120 by the solution circulation pump 122. Further, the low-temperature solution heat exchanger 126 supplies the absorber 120 with a concentrated solution whose temperature has been reduced by heat exchange.

  The absorber 120 absorbs the refrigerant evaporated in the evaporator 118. A concentrated solution is supplied into the absorber 22 from the low-temperature solution heat exchanger 126, and the evaporated refrigerant is absorbed by the concentrated solution to generate a diluted solution. Further, a heat transfer tube 20 a is inserted into the absorber 120. Cooling water flows through the heat transfer tube 20a, and absorbed heat is removed by the cooling water of the heat transfer tube 20a due to absorption of the refrigerant of the concentrated solution. The heat transfer tube 20a is connected to the heat transfer tube 16a.

  The solution circulation pump 122 supplies the high temperature regenerator 110 with the diluted solution whose concentration has been reduced by absorption of the refrigerant in the absorber 120. As described above, the dilute solution is supplied to the high temperature regenerator 110 in a state where the heat is reduced by the high temperature and low temperature solution heat exchangers 124 and 126 and the temperature is lowered.

  The absorption chiller / heater 2 includes a cooling / heating switching valve 30. The absorption chiller / heater 2 is switched between cooling and heating by switching the cooling / heating switching valve 30.

  When the cooling / heating switching valve 30 is switched, the dilute solution heated by the high-temperature regenerator 110 rises to the separator 112, and the cooling / heating switching is performed in the gas-liquid mixed state in which the refrigerant vapor and the intermediate concentrated solution are mixed from the separator 112. It flows into the evaporator 118 through the valve 30. The refrigerant vapor flowing into the evaporator 118 gives heat to the water flowing in the heat transfer pipe 118b, and condenses itself into a liquid refrigerant.

  The liquid refrigerant is mixed with the intermediate concentrated solution flowing into the evaporator 118 to become a diluted solution, pressurized by the solution circulation pump 122, and sent to the high temperature regenerator 110 via the low temperature solution heat exchanger 126 and the high temperature solution heat exchanger 124. And the cycle is repeated. The hot water flowing through the heat transfer pipe 18b is heated by the heat of condensation of the refrigerant vapor to become a high temperature. For example, the heating operation can be performed by exchanging heat between the hot water and the room air.

  Further, in the present embodiment, the absorption chiller / heater 2 includes a control device 50, an outdoor sensor 60, and a chilled / hot water outlet temperature sensor 70. The control device 50 and the outdoor sensor 60 are the same as those shown in FIG. The cold / hot water outlet temperature sensor 70 detects the temperature of the cold / hot water of the exit side from the absorption type cold / hot water machine 2 in the heat exchanger tube 118b. Further, the control device 50 is configured as shown in FIG.

FIG. 10 is a functional block diagram showing details of the control device 50 shown in FIG. A control device 50 shown in FIG. 2 is similar to that shown in FIG. 3 in that a control unit (control unit) 51, a gradient calculation unit (gradient calculation unit) 52, and an arrival time prediction unit 53 (arrival time prediction unit).
And a time correction unit (time correction means) 54, and performs the same operation as described above based on the temperature of the cold / hot water outlet temperature sensor 70 instead of the room temperature sensor 40.

  For this reason, this absorption-type cold / hot water machine 2 will perform the same operation | movement as the operation | movement shown to FIGS. 6-8 at the time of heating operation. Therefore, the absorption chiller / heater 2 can reduce the frequency at which the room temperature undershoots as well as the hot air blower 1 shown in FIG. Further, undershoot can be further prevented in the same manner as the warm air machine 1 shown in FIG. 1 and the like, and control in accordance with the combustion of the wood pellets can be performed.

  Further, the absorption chiller / heater 2 can reduce the frequency at which the room temperature overshoots even during the cooling operation, and can suppress an increase in fuel cost. In this case, the absorption chiller / heater 2 performs the same operation as that in the heating operation shown in FIGS. 6 to 8 in the form of the cooling operation. Further, the overshoot can be further prevented in the same manner as the warm air machine 1 shown in FIG. 1 and the like, and the control according to the combustion of the wood pellets can be performed.

1 ... Hot air machine (air conditioner)
2 ... Absorption chiller / heater (air conditioner)
3 ... Wood pellet tank 5 ... Conveyor 7 ... Greenhouse 9 ... Combustor 11 ... Furnace 13 ... Chimney 15 ... Arrow 17 ... Blower 19 ... Air intake 21 ... Air outlet 23 ... Arrow 40 ... Room temperature sensor 50 ... Control Apparatus 51 ... Control part (control means)
52. Gradient calculation unit (gradient calculation means)
53 ... Arrival time prediction unit (arrival time prediction means)
54 ... Time correction unit (time correction means)
60 ... Outdoor sensor 70 ... Cold / hot water outlet temperature sensor 110 ... High temperature regenerator 110a ... Combustor 112 ... Separator 114 ... Low temperature regenerator 116 ... Condenser 118 ... Evaporator 120 ... Absorber 122 ... Solution circulation pump 124 ... High temperature solution Heat exchanger 126 ... low temperature solution heat exchanger

Claims (3)

A hot air blower that uses heat generated by burning wood pellets with an electric heater to control room temperature,
A room temperature sensor for detecting room temperature;
A gradient calculating means for calculating a change gradient from room temperature to room temperature detected by the room temperature sensor when the operation is stopped;
An arrival time predicting means for predicting, as a predicted time, a time until the room temperature reaches a preset target temperature based on the change gradient calculated by the gradient calculating means;
When the predicted time calculated by the arrival time predicting means is less than the set time set based on the time required for the electric heater to burn the wooden pellet, the ignition control of the wooden pellet by the electric heater is started. Control means for causing
An air conditioner comprising: An outdoor sensor for detecting the outdoor temperature;
Time correction means for correcting the set time according to the outdoor temperature detected by the outdoor sensor;
An air conditioner further comprising: The control means includes
Control at least two modes, a low load mode and a high load mode, depending on the size of the heating load or cooling load,
When starting the operation in the low load mode from the operation stop state, when the predicted time becomes equal to or shorter than the set time, ignition control of the wood pellet by the electric heater is started. The air conditioner according to claim 2.

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