JP2010014328A - Air conditioning system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioning system capable of utilizing solar heat collected by a solar heat collecting panel, effectively for air conditioning operation in the air conditioning system utilizing solar heat by an absorption refrigerator. <P>SOLUTION: The air conditioning system comprises a solar heat circuit L, the absorption refrigerator 1, a first heat exchanger 2 and a control device 10. A solar heat collector 3 and a first pump P1 for circulating a heat medium in the solar heat circuit are interposed in the solar heat circuit L, and a branch circuit LB1 is provided by being branched off (B1) from the solar heat circuit L and joining the solar heat circuit L (through a three-way valve Vb). A stratified type hot water storage tank 4 and a second pump P2 allowing the heat medium to flow in the branch circuit LB1 are interposed in the branch circuit LB1. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a technology that uses solar heat for air conditioning, and more particularly to an air conditioning system that uses solar heat for cooling operation by an absorption refrigerator.

Absorption refrigerators are widely used as a technique for obtaining cold heat from a heat source. Among such absorption refrigerators, a type utilizing relatively low-temperature (30 ° C. to 120 ° C.) heat has also been proposed (see, for example, Patent Document 1 and Patent Document 2). If this type of absorption refrigerator uses heat at a relatively low temperature (30 ° C. to 120 ° C.), heat obtained by a solar heat collector (solar heat collector panel: collector), so-called “solar heat” , Can also be used.
However, in the absorption refrigerator according to the above-described prior art (Patent Document 1, Patent Document 2), the combination with the solar heat collecting panel is not considered, and the solar heat which is a heat source that varies greatly depending on the weather or the amount of solar radiation is used. From the viewpoint of use, the system and control are not designed.

Here, the solar heat collection panel collects heat if the amount of solar radiation, outside air temperature, and other conditions are met, but the air conditioning load connected to the absorption chiller is the presence or absence of solar heat collection in the solar heat collection panel It fluctuates independently of.
Therefore, in an air conditioning system that combines a solar heat collection panel and an absorption chiller, the absorption chiller, the solar heat collection panel, the mechanism that connects them, and the control of the entire system are not properly constructed. The solar heat collected by the heat panel is wasted or wasted, the heat medium flowing in the system is boiled due to overheating, or the heat medium is frozen.

On the other hand, in a system that combines a hot water storage tank and a solar heat collection panel, it is judged whether solar heat can be collected and a pump that circulates the heat medium in a circuit interposing the solar heat collection panel is operated. There has been proposed a technique for controlling the on-off valve and the pump in the circuit according to the temperature of the heat medium while stopping (see Patent Document 3).
There is also a technique for preventing freezing of a heat medium flowing through a circuit interposing a solar heat collection panel in a system in which a hot water storage tank and a solar heat collection panel are combined (see Patent Document 4).
In a similar system, a part of the solar heat collection panel or line is installed lower than the heat storage tank, preventing the heat medium in the heat storage tank from flowing out when the heat medium is removed from the solar heat collection panel or line. There is also a technique to do this (see Patent Document 5).

And in the system which combined the hot water storage tank and the solar thermal collection panel, the technique which prevents the boiling of the thermal medium which flows through the circuit which interposed the solar thermal collection panel also exists (refer patent document 6-patent document 8).
Furthermore, in a system that combines a hot water storage tank and a solar heat collection panel, when the pump that circulates the heat medium that flows through the circuit interposing the solar heat collection panel is stopped and then restarted, the heat medium is hot. In some cases, there is a technique for preventing equipment such as a pipe, a heat exchanger, and a pump from being in a so-called “heat shock state” and damaging the equipment (see Patent Document 9).

However, in the related art (Patent Documents 3 to 9), the solar heat collection panel and the heat storage tank (or the heat exchanger in the heat storage tank) are connected in series. Therefore, when using solar heat in an absorption refrigerator, if the heat medium in the heat storage tank is not heated by solar heat to raise the temperature, the temperature of the heat medium flowing in the circuit interposing the solar heat collecting panel also rises. Do not warm.
Therefore, it takes a long time from the start of solar heat collection until it can be used in an absorption refrigerator, and it is difficult to effectively use solar heat for air conditioning by the absorption refrigerator.
In addition, the related arts (Patent Documents 3 to 9) do not perform an appropriate system and control from the viewpoint of solar heat utilization, and cannot respond to a request for providing a system and control suitable for solar heat utilization. .
Japanese Patent Laid-Open No. 7-218017 JP-A-2005-121332 JP-A-57-192746 JP 58-6356 A Japanese Patent Laid-Open No. 58-12926 JP 58-142159 A JP 59-21945 JP-A-60-207855 JP 59-44546 A

  The present invention has been proposed in view of the above-described problems of the prior art, and is an air conditioning system that uses solar heat for air conditioning operation, and effectively uses solar heat collected by a solar heat collecting panel for air conditioning operation. The purpose is to provide an air conditioning system that can do this.

In the air conditioning system of the present invention, the solar heat circuit (L), the absorption chiller (1), the absorption solution circulating in the absorption chiller and the heat medium circulating in the solar heat circuit (L) perform heat exchange. 1 heat exchanger (2: solar heat exchanger, heat recovery device) and a control device (10), and the solar heat circuit (L) includes a solar heat collector (3: solar heat collection panel: collector) and solar heat. A first pump (P1) for circulating the heat medium in the circuit is interposed, and a branch circuit (LB1) branching from the solar heat circuit (L) (branch point B1) and joining (three-way valve Vb) The branch circuit (LB1) is provided with a stratified hot water tank (hot water tank 4) and a second pump (P2) for allowing a heat medium to flow through the branch circuit (LB1), and the control The device (10) has a hot water tank while maintaining the stratified state in the hot water tank (4). 4) The function of discharging solar heat in the heat storage tank (4) or releasing the amount of heat stored in the hot water tank (4) to the solar heat circuit (L), and the heat medium circulating in the solar heat circuit (L) via the hot water tank (4) However, it has a function of switching the flow of the heat medium so that it does not go through (claim 1).
Here, a 1st heat exchanger (2: solar heat exchanger) is equipped with the dilute solution line which has come out from the absorber in an absorption refrigerator (1), and circulates through solar heat (solar heat circuit L). It includes all heat recovery devices that recover the amount of heat held by the heat medium.

  In the present invention (the air conditioning system of claim 1), a flow path switching device (three-way valve Vb) for adjusting the flow rate and switching the flow path is disposed at the junction of the branch circuit (LB1) and the solar heat circuit (L). The branch circuit (LB1) includes a first branch line (Lb1) having a first on-off valve (V1) and a second branch line (Lb2) having a second on-off valve (V2). ), The first branch line (Lb1) communicates with the area above the hot water tank (4), and the second branch line (Lb2) communicates with the area below the hot water tank (4). A third branch line (Lb3) having a third on-off valve (V3) interposed between the hot water tank (4) and the junction (three-way valve Vb) of the solar heat circuit (L). A fourth branch line (Lb4) interposing a fourth on-off valve (V4), and an area above the hot water tank (4) Communicates with the junction (three-way valve Vb) with the solar heat circuit (L) via the third branch line (Lb3), and the region below the hot water tank (4) passes through the fourth branch line (Lb4). The control device (10) communicates with the temperature of the heat medium flowing through the solar heat circuit (L) and the heat medium in the hot water tank (4). On and off control of the first on-off valve to the fourth on-off valve (V1 to V4), the operation / stop control of the second pump (P2), and the flow path switching device (three-way valve Vb). It is preferable to have a function of performing the switching control of (2).

  Here (in the air conditioning system of claim 2), the control device (10) stores heat in the hot water tank (4) stored in the hot water tank (4) (for example, the amount of solar radiation). In the case of many), the first on-off valve (V1) and the fourth on-off valve (V4) are opened, the second on-off valve (V2) and the third on-off valve (V3) are closed, and the hot water storage tank (4) When supplying the amount of heat stored in the solar heat circuit (L) (when the amount of solar radiation is large and the solar heat is supplied to the absorption refrigerator), the second on-off valve (V2) and the second It is preferable to have a function of opening the third on-off valve (V3) and closing the first on-off valve (V1) and the fourth on-off valve (V4).

Moreover, in this invention (the air conditioning system of Claim 3), the exit (3o) side of the solar heat collector (3: solar heat collection panel: collector) rather than the first heat exchanger (2) in the solar heat circuit (L) The first temperature sensor (St ₁ ) that measures the temperature (T ₁ ) of the heat medium that flows in the area of the second temperature sensor, and the second temperature sensor that measures the temperature (T ₂ ) of the heat medium in the area above the hot water tank (4) and (St2), the measured temperature _{(T 3)} of the first heat exchanger (2) heat flowing area of the side medium from the branch point (B1) of the branch circuit (LB1) in solar circuit (L) 3, and the control device (10) includes a first temperature sensor (St1) after the absorption chiller (1) is activated and the first pump (P1) is activated. absorbent solution in flowing the measured heating medium temperature (T ₁₎ is the absorption refrigerating machine (1) Heating to it can be a threshold _{(T 0)} or less, the hot water storage tank measured by the second temperature sensor (St2) (4) within the heat medium temperature _{(T 2)} is a third temperature sensor (St3) When the temperature is equal to or lower than the heat medium temperature (T ₃ ) measured in step 1, the second pump (P2) is stopped, and the flow path switching device is set so that the heat medium flowing through the solar heat circuit (L) does not flow into the branch circuit (LB1). It is preferable to have a function of controlling the (three-way valve Vb) (Claim 4: see FIG. 2).

In this case (in the air conditioning system of claim 4), wherein the control device (10), the heat medium temperature measured by the first temperature sensor (St1) (T ₁₎ is the absorption chiller absorbent solution flowing through the (1) The heat medium temperature (T ₂ ) in the hot water storage tank (4) measured by the second temperature sensor (St2) is equal to or lower than a threshold (T ₀ ) that can be heated, and the third temperature sensor (St3) When the temperature is higher than the heat medium temperature (T ₃ ) measured in step 2, the second pump (P2) is operated, and the flow switching device (three-way valve Vb) is controlled to flow through the solar heat circuit (L). Proportionally controlling the flow rate of the medium passing through the hot water tank (4), and the heat medium temperature (T ₁ ) measured by the first temperature sensor (St1) heats the absorbing solution flowing through the absorption refrigerator (1). It can be controlled to a threshold value (T ₀₎ (step in FIG. 2 S9) preferably has a function (claim 5: see FIG. 2).

In the present invention (the air conditioning system according to any one of claims 3 to 5), the solar heat collector (3: solar heat collection panel: collector) rather than the first heat exchanger (2) in the solar heat circuit (L). Provided with a first temperature sensor (St1) for measuring the temperature (T ₁ ) of the heat medium flowing in the region on the outlet (3o) side of the control device, and the control device (10) measures with the first temperature sensor (St1). The temperature (T ₀ + ΔT ₀ ) obtained by adding the predetermined temperature (ΔT ₀ ) to the threshold (T ₀ ) at which the heat medium temperature (T ₁ ) is heated to the absorbing solution flowing through the absorption refrigerator (1). When the temperature is higher than that, the flow rate switching device (three-way valve Vb) is controlled to proportionally control the flow rate of the heat medium flowing through the solar heat circuit (L) through the hot water tank (4), and the first temperature sensor The heat medium temperature (T1) measured in (St1) flows through the absorption refrigerator (1). Absorbent solution predetermined temperature ([Delta] T ₀₎ than the threshold value (T ₀₎ which can be heated only to control so as to be high temperature preferably has a function (step S30 in FIG. 3) (claim 6: See FIG.

Here (in claim 6), a second temperature sensor (St2) for measuring the temperature (T2) of the heat medium in the region above the hot water tank (4), and a branch circuit (LB1) in the solar heat circuit (L) And a third temperature sensor (St3) for measuring the temperature (T ₃ ) of the heat medium flowing through the region closer to the first heat exchanger (2) than the branch point (B1) of the control device (10). ), The heat medium temperature (T ₁ ) measured by the first temperature sensor (St1) is equal to or lower than the threshold (T0) that can heat the absorbing solution flowing through the absorption refrigerator (1). When the heat medium temperature (T ₂ ) in the hot water storage tank (4) measured by the second temperature sensor (St2) is higher than the heat medium temperature (T ₃ ) measured by the third temperature sensor (St3) Includes operating the second pump (P2), the second on-off valve (V2) and the second The on-off valve (V3) is opened, the first on-off valve (V1) and the fourth on-off valve (V4) are closed, so that the hot water storage tank (4) is maintained while maintaining the stratified state of the hot water storage tank (4). The amount of heat stored in 4) is released to the solar heat circuit (L), and the flow rate of the heat medium flowing through the solar heat circuit (L) by controlling the flow path switching device (three-way valve Vb) through the hot water tank (4) The heat medium temperature (T ₁ ) measured by the first temperature sensor (St ₁ ) is controlled in proportion to the threshold value (T ₀ ) that can heat the absorbing solution flowing through the absorption refrigerator (1). It is preferable to have a function of raising the temperature by the temperature (ΔT ₀ ) (step S30 in FIG. 3) (see FIG. 3).

The above-described control method of the air conditioning system of the present invention (the air conditioning system according to claim 4) includes the first temperature sensor (St1) after the absorption chiller (1) is activated and the first pump (P1) is activated. ) Was measured with the second temperature sensor (St2) because the heat medium temperature (T ₁ ) measured in (1) was below the threshold value (T ₀ ) capable of heating the absorbing solution flowing through the absorption refrigerator (1). When the heat medium temperature (T ₂ ) in the hot water tank (4) is equal to or lower than the heat medium temperature (T ₃ ) measured by the third temperature sensor (St3), the second pump (P2) is stopped and the solar heat It is preferable to switch and control the flow path switching device (three-way valve Vb) so that the heat medium flowing through the circuit (L) does not flow into the branch circuit (LB1) (step S13 in FIG. 2).

In this case, the heat medium temperature (T ₁ ) measured by the first temperature sensor (St1) is equal to or lower than a threshold value (T ₀ ) at which the absorbing solution flowing through the absorption refrigerator (1) can be heated. When the heat medium temperature (T ₂ ) in the hot water storage tank (4) measured by the second temperature sensor (St2) is higher than the heat medium temperature (T ₃ ) measured by the third temperature sensor (St3). Operates the second pump (P2) and controls the flow path switching device (three-way valve Vb) to proportionally control the flow rate of the heat medium flowing through the solar heat circuit (L) through the hot water tank (4) (FIG. Step S9) in step 2 is preferred.

In the control method of the above-described air conditioning system of the present invention (the air conditioning system according to claim 6), the absorption medium in which the heat medium temperature (T ₁ ) measured by the first temperature sensor (St1) flows through the absorption refrigerator (1) When the temperature is higher than a temperature (T ₀ + ΔT ₀ ) obtained by adding a predetermined temperature (ΔT ₀ ) to a threshold (T ₀ ) capable of heating the flow path, the flow path switching device (three-way valve Vb) is controlled. The heat medium flowing through the solar heat circuit (L) proportionally controls the flow rate through the hot water storage tank (4), and the heat medium temperature (T ₁ ) measured by the first temperature sensor (St1) is the absorption refrigerator (1). It is preferable to control the temperature so as to be higher by a predetermined temperature (ΔT ₀ ) than the threshold value (T ₀ ) at which the absorbing solution flowing through can be heated (step S 26 in FIG. 3).

Here, in the control method of the present invention (the air conditioning system of claim 6), the heat medium temperature (T ₁ ) measured by the first temperature sensor (St1) heats the absorbing solution flowing through the absorption refrigerator (1). it can be the threshold value _{(T 0)} is equal to or less than the hot water storage tank measured by the second temperature sensor (St2) (4) within the heat medium temperature _{(T 2)} is a third temperature sensor (St3) When the temperature is higher than the heat medium temperature (T ₃ ) measured in step 2, the second pump (P2) is operated to open the second on-off valve (V2) and the third on-off valve (V3). The first on-off valve (V1) and the fourth on-off valve (V4) are closed, so that the amount of heat stored in the hot water storage tank (4) is maintained while the stratified state of the hot water storage tank (4) is maintained. In addition to discharging to the circuit (L), the flow switching device (three-way valve Vb) is controlled to flow through the solar thermal circuit (L). The flow heat medium through the hot water storage tank (4) with proportional control, the heat medium temperature measured by the first temperature sensor (St1) (T ₁₎ to heat the absorbent solution flowing in the absorption refrigerating machine (1) it is allowed to a high temperature by the predetermined temperature ([Delta] T ₀₎ than the threshold value _{(T 0)} which can is preferable (step S30 in FIG. 3) (see FIG. 3).

  In the present invention, the second branch branches (B2) from the solar thermal circuit (L) and joins (three-way valve Vc) to the solar thermal circuit (L) via the second heat exchanger (heating heat exchanger 5). A circuit (LB2H) is interposed, and the second heat exchanger (heating heat exchanger 5) exchanges heat between the heat medium flowing through the solar heat circuit (L) and the hot water flowing through the hot water line (heating hot water line Lh). It is preferable that the hot water line (heating hot water line Lh) communicates with the heating load (claim 7).

  In such an air conditioning system (the air conditioning system of claim 7), the control device (10) converts the solar heat circuit (L) into the first heat exchanger (2: solar heat heat exchanger, The second heat exchanger (heating heat exchanger 5) bypasses the solar heat circuit (L) when the heating operation is performed. Although it communicates with the heating heat exchanger 5), it is preferable that the first heat exchanger (2: solar heat exchanger, heat recovery device) has a function of bypassing (claim 8).

According to the present invention having the above-described configuration, the stratified hot water tank (hot water tank 4) is branched from the solar thermal circuit (L) (branch point B1) to the branch circuit (LB1) that joins (three-way valve Vb). If it is switched so that the heat medium flowing through the solar heat circuit (L) does not flow into the branch circuit (LB1) at startup, the heat medium in the hot water tank (4) is absorbed by the absorption refrigerator (1 ) Or the heating heat exchanger (5), it is not necessary to raise the temperature to a threshold temperature (T ₀ ) or higher at which solar heat can be used.
As a result, only the heat medium other than the heat medium in the branch circuit (LB1) and the hot water tank (4) may be heated to a temperature higher than the threshold temperature (T ₀ ), and the branch circuit (LB1) and the hot water tank ( 4) Since the time for heating the heating medium becomes unnecessary, the time for heating the heating medium at start-up can be shortened.

Moreover, according to the air conditioning system of the present invention, the solar heat collection state in the solar heat collector (3: solar heat collection panel: collector), the temperature of the heat medium circulating in the solar heat circuit (L), the hot water tank (4 ) In the hot water storage tank (4) based on the heat medium temperature or the like in the hot water storage tank (4) or while releasing the amount of heat stored in the hot water storage tank (4) to the solar heat circuit (L). It is possible to effectively use solar heat in the air conditioning system while maintaining the stratified state inside.
And it becomes possible to perform an appropriate system and control from the viewpoint of solar heat utilization, and therefore, a system and control suitable for solar heat utilization can be provided.

Furthermore, in the present invention, the operation / stop of the first pump (P1) in the solar heat circuit (L) can be synchronized with the operation / stop of the absorption refrigeration machine (1). Can be used.
Further, the second pump (P2) in the branch circuit (LB1) based on the solar heat collection status, the temperature of the heat medium circulating in the solar heat circuit (L), the heat medium temperature in the hot water tank (4), and the like. Therefore, it is possible to prevent the heat medium from being excessively conveyed by the branch circuit (LB1).
And power consumption can be saved by appropriately controlling the operation and stop of the first pump (P1) and the second pump (P2).

In order to realize the above-described appropriate control, in the present invention, the flow rate switching device (three-way valve Vb) is controlled to proportionally control the flow rate of the heat medium flowing through the solar thermal circuit through the hot water storage tank (4). The temperature (T ₁ ) of the heat medium flowing through the region closer to the solar heat collector (3: solar heat collection panel: collector) than the first heat exchanger (2) in the circuit (L) is the absorption refrigerator (1 3) (steps S26 and S30 in FIG. 3) can be controlled so as to be higher by a predetermined temperature (ΔT ₀ ) than the threshold (T ₀ ) at which the absorbing solution flowing through Item 6).
If such control is executed (according to claim 6), the heat utilization characteristics of the absorption refrigerator (1) can be maximized and the temperature can be raised to a temperature at which heat can be collected.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
In FIG. 1, an air conditioning system generally indicated by reference numeral 100 includes a solar thermal circuit L including a solar thermal collector (solar thermal collector panel, thermal collector panel) 3, an absorption refrigerator 1, and a control that is a control means. A unit 10 is provided.

The solar heat circuit L is in communication with a first heat exchanger 2 (solar heat exchanger) for solar heat recovery provided in the absorption refrigerator 1. Here, the 1st heat exchanger 2 (solar heat exchanger) is equipped with the dilute solution line which has come out from the absorber in absorption refrigeration machine 1, and solar heat (the heat medium which circulates through the solar thermal circuit L) is equipped. It includes all heat recovery equipment that recovers the amount of heat held. Although not clearly shown, in the absorption refrigerator 1, the absorption solution flowing out from the absorber is heated in the solar heat exchanger 2 with the amount of heat held by the heat medium flowing through the solar heat circuit L being heated. Is done.
As the heat medium flowing through the solar heat circuit L, for example, warm water or warm water mixed with antifreeze can be used. However, the heat medium is not limited to this.
In FIG. 1, the arrow attached to the solar heat circuit L indicates the direction of the flow of the heat medium.

  The solar heat circuit L is provided with a first branch point B1, and a three-way valve Vb is interposed in a region between the branch point B1 (first branch point) and the solar heat collecting panel 3. . The three-way valve Vb has a port c, a port d, and a port e. The first branch point B1 and the port c are connected by the first branch circuit LB1, and the first branch circuit LB1 has a stratified type. A hot water tank 4 is interposed.

In the solar thermal circuit L, a branch point B3 (third branch point) is formed in a region between the outlet 3o of the solar heat collecting panel 3 and the inlet 1i of the absorption chiller 1. A three-way valve Va is interposed in the area near the outlet 1o of the absorption refrigerator 1. The three-way valve Va has a port c, a port d, and a port e, and the third branch point B3 and the port d are connected by a third bypass circuit LB3.
In FIG. 1, the first heat exchanger 2 that inputs solar heat to the absorption refrigerator 1 is located in the solar heat circuit L between the inlet 1 i and the outlet 1 o of the absorption refrigerator 1.

In the solar thermal circuit L, a branch point B2 (second branch point) is provided in a region between the three-way valve Va and the branch point B1, and a region between the branch point B2 and the first branch point B1 is provided. Is provided with a three-way valve Vc, which has a port c, a port d, and a port e. The second branch point B2 and the port c of the three-way valve Vc are connected by a second branch circuit LB2H. The second branch circuit LB2H has a second heat exchanger (a heating heat exchanger). ) 5 is installed.
In the heating heat exchanger 5, the heat medium flowing through the solar heat circuit L and the hot water flowing through the heating hot water line Lh communicating with a heating load (not shown) are configured to perform heat exchange.

Although not clearly shown, in the air conditioning system 100 of FIG. 1, the control unit 10 determines whether the air conditioning system 100 is performing a cooling operation or a heating operation. In the determination, for example, it may be determined by receiving control from an operation changeover switch (not shown), or may be determined by measuring various control parameters.
When the air conditioning system 100 is performing a cooling operation, the control unit 10 switches and controls the three-way valves Va and Vc, communicates the solar heat circuit L with the solar heat exchanger 2, and switches and controls the three-way valve Vc. Thus, the solar heat circuit L is caused to bypass the heating heat exchanger 5.
On the other hand, when the air conditioning system 100 is performing the heating operation, the control unit 10 controls the switching of the three-way valves Va and Vc so that the solar heat circuit L communicates with the heating heat exchanger 5 and switches the three-way valve Va. The solar heat circuit L is controlled so as to bypass the solar heat exchanger 2.

In the solar heat circuit L, a first pump P <b> 1 is interposed in a region between the three-way valve Vb and the solar heat collection panel 3.
In the solar thermal circuit L, a pressure sensor 7, an expansion tank 8, and a release valve 9 are interposed in an area between the outlet 3o of the solar thermal collection panel 3 and the third branch point B3.
Here, the expansion tank 8 is recollected in order to cope with the expansion of the heat medium flowing through the solar heat circuit L, and the release valve 9 is used to release the pressure when the pressure in the solar heat circuit L rises. It is disguised.

In the solar thermal circuit L, a temperature sensor St1 (first temperature sensor) and a temperature sensor St11 are interposed in a region between the release valve 9 and the branch point B3.
A temperature sensor St12 is interposed in the region between the outlet 1o of the absorption refrigerator 1 and the three-way valve Va, and a temperature sensor St13 is interposed in the region between the three-way valve Va and the branch point B2. .
A temperature sensor St3 (third temperature sensor) is interposed in the region between the three-way valve Vc and the branch point B1. Is intervening.
A temperature sensor St6 (sixth temperature sensor) is provided on the surface of the solar heat collection panel 3, and a temperature sensor St4 (fourth temperature) is provided in an area between the outlet 3o of the solar heat collection panel 3 and the pressure sensor 7. Sensor).

In the second branch circuit LB2H, a temperature sensor St14 is interposed in a region between the branch point B2 and the second heat exchanger 5, and between the second heat exchanger 5 and the three-way valve Vc. A temperature sensor St15 is interposed in the region.
A temperature sensor St51 is interposed on the outlet side of the second heat exchanger 5 in the heating hot water line Lh (the side for supplying hot water to a heating load not shown), and the inlet side of the second heat exchanger 5 (not shown). A warm water temperature sensor St52 is interposed on the side where warm water is sent from the heating load, and measures the temperature of warm water flowing through the heating warm water line Lh.
A flow meter Sf is interposed on the inlet side of the second heat exchanger 5 to measure the flow rate of the hot water flowing through the heating / hot water line Lh.

The control unit 10 of the air conditioning system 100 performs switching control of the three-way valve Va so that the amount of heat held by the heat medium flowing through the solar heat circuit L circulates in the absorption refrigerator 1 via the solar heat exchanger 2. It is controlled so that it is thrown into.
At the same time, the amount of heat held by the absorption solution circulating in the absorption refrigerator 1 is controlled so that it does not flow back to the heat medium circulating in the solar heat circuit L in the solar heat exchanger 2.

That is, the control unit 10 determines the temperature T11 (measured value of the temperature sensor St11) immediately before the heat medium circulating in the solar heat circuit L flows into the absorption refrigerator 1 and the heat medium temperature immediately after passing through the heat exchanger 2. T12 (measured value of temperature sensor St12) or heat medium temperature T13 (measured value of temperature sensor St13) immediately after flowing through the three-way valve Va is measured, and the heat medium in which the liquid temperature of the absorbing solution flows through the heat exchanger 2 It is determined whether or not the temperature is higher than the above temperature, that is, whether or not “back flow of heat” from the absorbing solution to the heat medium occurs.
When it is determined that “backflow of heat” occurs, the control unit 10 switches the three-way valve Va so that the heat medium circulating in the solar heat circuit L bypasses the solar heat exchanger 2 and flows through the line LB3. .

A stratified hot water tank 4 is interposed in the first branch circuit LB1 that connects the branch point B1 of the solar thermal circuit L and the three-way valve Vb. In other words, the solar circuit L is interposed in such a manner that the stratified hot water tank 4 can be bypassed.
The first branch circuit LB1 interposing the stratified hot water tank 4 branches from the solar heat circuit L at the branch point B1 and merges with the solar heat circuit L at the three-way valve Vb. The branch circuit LB1 and the hot water storage tank 4 are connected by four lines Lb1, Lb2, Lb3, and Lb4 interposing the on-off valves V1 to V4.

The details will be described later with reference to FIG. 2 and subsequent drawings. When the amount of solar radiation is sufficient and the heat medium is heated to a high temperature by the solar heat collecting panel 3, the heated heat medium is stored in the hot water tank 4. Then, heat storage is performed (steps S24 to S27 of the heat storage operation in FIG. 3).
During the heat storage, the on-off valves V1 and V4 are opened and the on-off valves V2 and V3 are closed. Thereby, the heated heat medium flows into the upper part of the hot water tank 4 through the line Lb1. And the low temperature heat medium which exists in the downward area | region of the hot water tank 4 flows in into the solar thermal circuit L via the line Lb4 and the port c of the three-way valve Vb.
A high temperature heat medium flows into the upper part of the hot water tank 4 via the line Lb1, and a low temperature heat medium below the hot water tank 4 flows out of the hot water tank 4 via the line Lb4. However, the temperature of the heat medium in the hot water storage tank 4 rises while maintaining the stratified state where the temperature is high and the lower region is low, and heat is stored in the hot water storage tank 4.

On the other hand, when the amount of solar radiation is small and the heat collection panel 3 does not heat the heat medium, but heat is stored in the hot water tank 4, and when solar heat should be input to the absorption refrigerator 1, the open / close valves V2, V3 Is opened and the on-off valves V1 and V4 are closed.
In this case, since the heat medium is not heated by the solar heat collecting panel 3, the temperature (T ₃ ) of the heat medium (circulating through the solar heat circuit L) after the amount of heat is input to the absorption refrigerator 1 side is low. . On the other hand, since the hot water storage tank 4 stores heat, at least the heat medium temperature (T ₂ ) in the region above the hot water storage tank 4 is high. That is, T ₂ > T ₃ .

If a low-temperature heat medium is caused to flow above the hot water tank 4, the stratified state is destroyed, and therefore, the low-temperature heat medium needs to be made to flow below the hot water tank 4. Therefore, the on-off valve V1 is closed so that the heat medium does not flow into the hot water tank 4 via the line Lb1. At the same time, the on-off valve V2 is opened so that the heat medium flows below the hot water tank 4 via the line Lb2.
On the other hand, since the heat medium in the hot water tank 4 has a relatively high heat medium temperature in at least the region above the hot water tank 4, the on-off valve V3 is opened and the relatively high heat in the region above the hot water tank 4. The medium is caused to flow into the solar thermal circuit L via the line Lb3. Here, since the temperature of the heat medium in the lower region of the hot water tank 4 is low, the on-off valve V4 is closed so that the low temperature heat medium does not flow into the solar heat circuit L.

Further, as described above, the solar heat circuit L is provided with a heating heat exchanger (second heat exchanger) 5 and communicates with a heat medium circulating in the solar heat circuit L and a heating load (not shown). Heat exchange is performed with hot water flowing through the heating hot water line Lh.
The control unit 10 causes the heating heat exchanger 5 to cause the amount of heat held by the heat medium flowing through the solar heat circuit L to be poured into the hot water flowing through the heating hot water line Lh, and holds the hot water flowing through the heating hot water line Lh. In order to prevent the amount of heat from flowing back to the heat medium circulating in the solar heat circuit L via the heating heat exchanger 5, switching control of the three-way valve Vc is performed.

That is, immediately after performing heat exchange with the temperature (T14) immediately before the heating heat exchanger 5 in the heat medium circulating in the solar heat circuit L, or with the hot water flowing in the heating hot water line Lh communicating with the heating load in the heating heat exchanger 5. The heat medium temperature (T15) is measured, and compared with the temperature (T51, T52) of the hot water flowing through the heating hot water line Lh, the hot water flowing through the heating hot water line Lh is referred to as the heat medium circulating in the solar heat circuit L. It is determined whether or not “backflow of heat” occurs.
When it is determined that “backflow of heat” occurs, the control unit 10 switches the three-way valve Vc so that the heat medium circulating in the solar heat circuit L bypasses the heating heat exchanger 5.

  With respect to “the temperature of the hot water flowing through the heating / hot water line Lh”, in FIG. 1, the hot water temperature T51 heated by the heating heat exchanger 5 toward the heating load and the warm water temperature T52 toward the heating heat exchanger from the heating load are measured. However, in the switching control of the three-way valve VC, only one of the hot water temperatures T51 and T52 may be used as a control parameter.

In the air conditioning system 100 described above, when the solar heat collecting panel 3 is overheated, an excessive amount of heat is stored in the hot water storage tank 4. And when a hot water storage tank reaches a limit temperature, it is comprised so that a safe stop may be carried out. Details will be described later with reference to FIG.
Further, the air-conditioning system 100 is configured to stop the heat medium circulation pumps P1 and P2 when the solar heat collection panel 3 cannot collect heat due to insufficient solar radiation or the like (see FIGS. 6 and 7). Later). In this case, when the solar radiation is recovered and the solar heat collecting panel 3 can collect heat, the heat medium circulation pumps P1 and P2 are restarted (see FIGS. 6 and 7). Later).
The air-conditioning system 100 can perform a heat collecting operation for the purpose of storing heat in the hot water tank 4 if conditions for collecting heat with the solar heat collecting panel are prepared even when the absorption refrigerator 1 is stopped. It is configured (described later with reference to FIGS. 9 and 10).
The air conditioning system 100 is configured to avoid freezing of the heat medium line when the heat medium circulation pumps P1 and P2 are stopped (described later with reference to FIG. 11).

The procedure for starting the air conditioning system 100 shown in FIG. 1 will be described mainly with reference to FIG.
In step S1 of FIG. 2, the absorption refrigerator 1 is started. Here, before the step S1, the pumps P1 and P2 are stopped, the on-off valves V1 and V4 are closed, and the on-off valves V2 and V3 are open.
In step S2, the first pump P1 of the solar thermal circuit L is operated. Prior to executing step S2, control for preventing heat shock, which will be described later with reference to FIG. 12, is performed. Further, there is a case where the process proceeds from step S66 in FIG. 6 to step S2.
In step S3, it is determined whether or not a predetermined time has elapsed, and the system waits until the predetermined time elapses (a loop in which step S3 is NO). If the predetermined time has elapsed (YES in step S3), and the heat medium temperature T ₁ of the solar circuit L measured by the first temperature sensor St1 determines whether exceeds the threshold value T ₀ (step S4). Here, the threshold value T ₀ is the temperature of the heat medium flowing through the solar heat circuit L, and means the lowest temperature at which the amount of heat held by the heat medium can be used in the absorption refrigerator 1 or the heating heat exchanger 5. ing. In other words, the threshold value T ₀ indicates a limit value (minimum value) at which solar heat can be received on the absorption refrigerator 1 side or the heating heat exchanger 5 side.

If high temperatures than the heat medium temperature T ₁ is the threshold T ₀ (step S4 YES), the process proceeds to step S14, (the operation control in the case of performing the hot water inlet temperature optimization control) operation control shown in FIG. 3, Alternatively, the operation control shown in FIG. 4 (operation control when hot water inlet temperature optimization control is not performed) is performed.
On the other hand, if the heat medium temperature _{T 1} is the threshold _{T 0} or less (step S4 NO), the process proceeds to step S15, performs a solar shortage determination control shown in FIG. Then, the process proceeds to step S5.
Here, there is a case where the process proceeds from step S34 in FIG. 3 to step S2.

In step S5, the heat medium temperature T ₂ in the upper region of the hot water tank 4 measured by the second temperature sensor St2 is, the heat medium temperature T ₃ of the branch point B1 immediately before the solar circuit L _(measurement of the third temperature sensor St3 It is determined whether the temperature is higher than (value). If high temperatures than the heat medium temperature _{T 2} is the heat medium temperature _{T 3} (step S5 YES) the process proceeds to step S6.
On the other hand, if the heat medium temperature T ₂ in the upper region of the hot water storage tank 4 is solar circuit heat medium temperature T ₃ less than the branch points B1 immediately before the L (step S5 NO), the heat storage amount of hot water storage tank 4 is insufficient If it is determined that there is, step S4 and subsequent steps are repeated (step S5 is NO loop).

Step S6 (the thermal medium temperature T ₂ in the upper region of the hot water storage tank 4 is higher than the heat medium temperature T ₃ of the branch point B1 immediately before the solar circuit L High: step S5 is YES) the condensing heat of solar heat collection panel 3 Although it is not sufficient, it is determined that the heat storage tank of the hot water storage tank 4 is sufficient, and the pump P2 of the first branch circuit LB1 is operated to connect the heat storage tank 4 to the solar thermal circuit L. Then in step S7, the heat medium temperature T ₂ in the upper region of the hot water storage tank 4 is equal to or less than the allowable maximum value T _2MAX.
Here, the allowable maximum value T _2MAX is obtained when the high-temperature heat medium in the hot water storage tank 4 flows into the solar heat circuit L without being mixed with the low-temperature heat medium circulating in the solar heat circuit L. L and / or the heat collecting panel 3 is a dangerous temperature (threshold temperature: for example, 85 ° C.).
If low temperatures than the upper heat medium temperature _{T 2} of the hot water tank 4 is the allowable maximum value _{T 2MAX} proceeds to (step S7 YES) step S8, the upper heat medium temperature _{T 2} of the hot water tank 4 is the allowable maximum value T If it is _2MAX or more (step S7 is NO), the process proceeds to step S9.

Step S8 (of the hot water tank 4 above the heat medium temperature _{T 2} is the allowable maximum value _{T 2MAX} temperature lower than: step S7 YES) in, and the port c and port e of the three-way valve Vb and switching control so as to communicate The heat medium flowing out from the hot water tank 4 is allowed to flow through 100% in the region on the pump P1 side from the branch point B1. Then, the process proceeds to step S10.
Step S9 (upper heat medium temperature _{T 2} of the hot water tank 4 is the allowable maximum value _{T 2MAX} above: step S7 NO) at the temperature _{T 1} of the heat medium flowing through the solar circuit L the threshold (absorption chiller-side The three-way valve Vb is proportionally controlled so as to be equal to T _{0 (} temperature at which solar heat can be received). In other words, the port c and the port d of the three-way valve Vb are partially connected to the port e, the high temperature heat medium exceeding the allowable maximum value _T2MAX flowing out from the hot water tank 4, and the threshold flowing through the solar heat circuit L. The three-way valve Vb is proportionally controlled so that the low temperature heat medium having a value T ₀ or less is mixed and the mixed heat medium temperature becomes T ₀ . Then, the process proceeds to step S10.

At step S10, after performing the control in step S8 or step S9, the heat medium temperature T ₂ in the upper region of the hot water tank 4 measured by the second temperature sensor St2 is, the branch point B1 immediately before the heat medium in the solar circuit L It is determined whether or not the temperature is higher than the temperature T ₃ (measured value of the third temperature sensor St3).
If high temperatures than the heat medium temperature _{T 2} is the heat medium temperature _{T 3} (step S10 YES), the process proceeds to step S11.
On the other hand, determines that the heat medium temperature T ₂ in the upper region of the hot water storage tank 4 is equal branch point B1 immediately before the heat medium temperature T ₃ less in solar circuit L (step S10 NO), the heat of the hot water tank 4 is not available Then, the pump P2 in the branch circuit LB1 is stopped. Then, by controlling the three-way valve Vb, the port d and the port e are communicated so that the heat medium of the solar heat circuit L does not flow into the hot water tank 4 side or the branch circuit LB1 side, and the port c on the branch circuit LB1 side is communicated. Is blocked (step S13). Then, the process returns to step S4.

Step S11 (heat medium temperature _{T 2} is a temperature higher than the heat medium temperature _{T 3:} Step S10 is YES) in, after executing the control of Step S5 to S10, the heat medium temperatures _{T 1} through the solar circuit L is the threshold it is determined whether a high temperature than T _0. If high temperatures than the heat medium temperature _{T 1} is the threshold _{T 0} through the solar circuit L (step S11 YES) the process proceeds to step S12.
On the other hand, even after performing the control of step S5 to S10, if left heat medium temperatures _{T 1} through the solar circuit L is the threshold _{T 0} or less (step S11 NO), the process proceeds to step S17, FIG. After performing the solar radiation deficiency determination control shown by 6, it returns to step S10.

Step S12 (than the heat medium temperature T ₁ is the threshold T ₀ through the solar circuit L High: step S11 YES) in, solar is heat collection heat medium temperature is then heated by the heat collection panel 3 Therefore, the absorption chiller 1 or the heating heat exchanger 5 may be charged with the amount of heat held by the heat medium heated by the heat collecting panel 3, and the amount of heat stored in the hot water tank 4 is absorbed by the absorption chiller 1. Alternatively, it is determined that it is not necessary to put in the heating heat exchanger 5. Therefore, the pump P2 is stopped, the three-way valve Vb is controlled, and switching control is performed so that the port d and the port e communicate with each other so that the heat medium in the hot water tank 4 does not flow into the solar heat circuit L. Do. Then, the process proceeds to step S16 and the operation control shown in FIG. 3 or 4 is executed.

According to the start control in FIG. 2 described above, at the time of startup of the air conditioning system, if not the heat storage in the hot water storage tank 4 (heat medium temperature T ₂ in the upper region of the hot water tank 4, the branch point B1 immediately before the solar circuit L heating medium temperature T ₃ for the following: in step S5, S10 is nO), without operating the pump P2, the three-way valve Vb is such that the heat medium flowing through the solar circuit L does not flow to the branch circuit LB1 and the hot water tank 4 Can be switched to. Therefore, at the time of start-up, it is not necessary to raise the temperature of the heat medium in the hot water tank 4 to a threshold temperature T ₀ (a temperature at which the absorbing solution flowing through the absorption refrigerator 1 can be heated) or higher.
As a result, among the heat medium solar circuit L, when heated only to a temperature higher than the threshold temperature T ₀ the heat medium other than the heat medium of the branch circuit LB1 and the hot water storage tank 4, the absorption refrigerating machine 1 or the heater heat Solar heat can be input to the exchanger 5, and time for heating the heating medium in the branch circuit LB1 and the hot water tank 4 becomes unnecessary. That is, the time for heating the heat medium at the time of startup can be shortened, and effective use of solar heat is promoted.

Also, if not the heat storage in the hot water storage tank 4 (heat medium temperature T ₂ in the upper region of the hot water tank 4, the heat medium of the branch point B1 immediately before the solar circuit L the temperature T ₃ in the following cases: steps S5, S10 is NO ), The pump P2 of the branch circuit LB1 is stopped, so that unnecessary power can be saved.
In addition to the control described above with reference to FIG. 2, the start-up control in the illustrated embodiment can also be described later with reference to FIG. 14.

FIG. 3 shows the heat collection efficiency of the solar heat collection panel 3 when the heat quantity held by the heat medium flowing through the solar heat circuit L is used in the absorption refrigerator 1 or the heating heat exchanger 5 in the system shown in FIG. However, the control (hot water inlet temperature optimal control) which makes the heat-medium temperature which flows through the solar-heat circuit L the optimal temperature for supplying solar heat to the absorption refrigerator 1 or the heating heat exchanger 5 is shown.
The hot water inlet temperature optimum control will be described mainly with reference to FIG.
In FIG. 3, the state of “start” is when the process proceeds to step S14 or step S16 in the start-up control shown in FIG. In such a case, the heat medium temperature T ₁ (heat medium temperature measured by the temperature sensor St1) flowing through the solar heat circuit L is higher than the threshold value T ₀ , and the absorption refrigerator 1 or the heating heat exchanger 5 The solar heat is input to the absorption refrigerator 1 by the three-way valve Va, or the solar heat is input to the heating heat exchanger 5 by the three-way valve Vc.

In step S21, after switching the three-way valve Va and supplying solar heat to the absorption refrigerator 1, or after switching and controlling the three-way valve Vc and supplying solar heat to the heating heat exchanger 5, the solar heat circuit L is switched on. It is determined whether or not a time (predetermined time: for example, 30 seconds to 60 seconds) when the circulating heat medium is in a steady state has elapsed.
If the predetermined time has elapsed after switching control of the three-way valve Va (YES in step S21), the process proceeds to step S35, and overheat prevention control shown in FIG. 5 is performed. Then, the process proceeds to step S22.

In step S22, the heat medium temperature _{T 1} of the solar circuit L is, determines whether a temperature higher than the temperature _{"T 0} + _{ΔT 0"} plus margin [Delta] T ₀ the threshold _{T 0.} Here, the heat medium temperature T ₁ and the threshold value T ₀ are not compared because the absorption refrigerator 1 or the heating heat exchange is performed if the temperature T ₁ of the solar heat circuit L is slightly below the threshold value T _0. If solar heat is not input to the vessel 5, so-called “hunting” occurs, and there is a possibility that the control becomes unstable. In order to prevent such hunting, in step S22, the temperature “T ₀ + ΔT ₀ ” considering the allowance ΔT ₀ is compared with the heat medium temperature T ₁ of the solar heat circuit L.
Here, the margin allowance ΔT ₀ is 5 ° C., for example.

If the heat medium temperature T ₁ of the solar thermal circuit L is not higher than the temperature “T ₀ + ΔT ₀ ” obtained by adding the margin ΔT ₀ to the threshold value T ₀ (step S22 is NO), the process proceeds to step S23. On the other hand, the heat medium temperature _{T 1} of the solar circuit L is, if a high temperature is higher than the temperature _{"T 0} + _{ΔT 0"} plus margin [Delta] T ₀ the threshold _{T 0} (step S22 YES), the process proceeds to step S24 .
In step S23, the heat medium temperature T ₁ of the solar circuit L is, determines whether a temperature higher than the threshold value T _0. Heating medium temperature _{T 1} is, if elevated temperatures than the threshold value _{T 0} (step S23 is YES), the flow returns to step S35, and repeats the overheat prevention control shown in FIG.
Meanwhile, a state where the heat medium temperature T ₁ of the solar circuit L is, if the threshold T ₀ or less (step S23 is NO), it is impossible to put the solar heat in the absorption chiller 1 or heating heat exchanger 5 Therefore, in step S34, the process proceeds to step S15 in FIG.

If the heat medium temperature T ₁ of the solar heat circuit L is higher than the temperature “T ₀ + ΔT ₀ ” (step S22 is YES), the solar heat is input to the absorption refrigerator 1 and the solar heat is stored in the hot water tank 4. Judge that it is possible. In step S24, the pump P2 of the branch circuit LB1 is operated. In step S25, the open / close valves V1 and V4 of the branch circuit LB1 are opened and the open / close valves V2 and V3 are closed in order to maintain the stratified state of the hot water tank 4. To do.
In step S26, the three-way valve Vb is proportionally controlled to mix the relatively high-temperature heat medium flowing through the solar heat circuit L with the relatively low-temperature heat medium stored in the region below the hot water tank 4, so that the solar heat circuit L The heating medium temperature T ₁ is set to a temperature “T ₀ + ΔT ₀ ” (T ₁ = T ₀ + ΔT ₀ ). The process proceeds to step S27, the temperature T ₁ of the heating medium of the solar circuit L determines whether exceeds the threshold value T _0.
If the heat medium temperature _{T 1} of the solar circuit L the threshold _{T 0} or less (step S27 is NO), the process goes to step S28. If the heat medium temperature _{T 1} is long exceeds the threshold value _{T 0} (step S27 is YES), the process proceeds to step S36, performs overheat prevention control shown in FIG. 5, the flow returns to step S26.

Step S28 (heat medium temperature _{T 1} of the solar circuit L the threshold _{T 0} following: Step S27 is NO) in, the heat medium temperature _{T 2} in the upper region of the hot water tank 4 measured by the second temperature sensor St2, it is determined whether a temperature higher than the heat medium temperature T ₃ of the branch point B1 immediately before the solar circuit L.
When step S28 is YES, a thermal medium temperature _{T 1} is the threshold _{T 0} or less, than the heat medium temperature _{T 2} is the branch point B1 immediately before the heat medium temperature _{T 3} in the upper region of the hot water tank 4 Since the amount of heat of the heat medium flowing through the solar heat circuit L cannot be input to the absorption refrigerator 1 or the heating heat exchanger 5 because it is high temperature, it is determined that the heat of the hot water tank 4 can be input to the absorption refrigerator 1, Proceed to S29.
Heating medium temperature T ₂ in the upper region of the hot water tank 4 measured by the second temperature sensor St2 is, if the branch point B1 immediately before the heat medium temperature T ₃ less in solar circuit L (Step S28 is NO), solar circuit It is determined that neither the amount of heat of the heat medium flowing through L nor the heat of the hot water storage tank 4 can be input to the absorption refrigerator 1 or the heating heat exchanger 5, and the process proceeds to step S33.

Step S29 (heat medium temperature T ₁ is at the threshold T ₀ or less, a temperature higher than the heat medium temperature T ₂ is the branch point B1 immediately before the heat medium temperature T ₃ in the upper region of the hot water tank 4), the on-off valve V1 and V4 are closed, the on-off valves V2 and V3 are opened (state of FIG. 1), the heat medium in the upper region of the hot water tank 4 is sent out to the solar heat circuit L side, and the process proceeds to step S30.
In step S30, the three-way valve Vb is switched and proportionally controlled so that the heat medium temperature T ₁ of the solar heat circuit L becomes the temperature “T ₀ + ΔT ₀ ” (T ₁ = T ₀ + ΔT ₀ ). The proportional control in step S30 can include a case where the heat medium flow rate from the branch circuit LB1 side is 0% or 100%. Then, the process proceeds to step S31.

In step S31, whether the heat medium temperature _{T 1} of the solar circuit L measured by the first temperature sensor St1 is, there is a temperature higher than the temperature _{"T 0} + [Delta] T _0" plus margin [Delta] T ₀ the threshold _{T 0} not Determine whether. If the heat medium temperature T ₁ of the solar heat circuit L is equal to or lower than the temperature “T ₀ + ΔT ₀ ” (step S31 is NO), the process proceeds to step S32.
If the heat medium temperature T ₁ of the solar heat circuit L measured by the first temperature sensor St1 is higher than the temperature “T ₀ + ΔT ₀ ” (step S31 is YES), the process proceeds to step S37 and the overheating shown in FIG. The prevention control is performed, the process returns to step S25, and step S25 and subsequent steps are repeated again.

Step S32 (heat medium temperature _{T 1} is the temperature _{"T 0} + _{ΔT 0"} following: step S31 NO) in the heat medium temperature _{T 1} is to determine whether it exceeds a threshold _{T 0.} Heating medium temperature _{T 1} is, if exceeds the threshold value _{T 0} (step S32 is YES), returns to step S30, and repeats the step S30 and later. On the other hand, the heat medium temperature T ₁ is, it is determined that not more than the threshold value T ₀ (step S32 is NO), it is not possible to put the solar heat in the absorption chiller 1 or heating heat exchanger 5 Then, the pump P2 is stopped (step S33), and the process proceeds to step S34. And it progresses to step S15 in the starting control shown in FIG.

According to the operation control method shown in FIG. 3, in steps S26 and S30, the three-way valve Vb partially communicates the port d and the port e, and partially communicates the port c and the port e. Thus, the heat medium circulating in the solar heat circuit L and the heat medium stored in the hot water tank 4 are mixed, and the flow rate of each is proportionally controlled. As a result, the heat medium temperature T ₁ flowing through the solar heat circuit L is controlled to be the temperature “T ₀ + ΔT ₀ ”, so that the heat medium temperature is optimized and the efficiency of the air conditioning system 100 is improved. To do.
Moreover, the imbalance between the amount of heat collected in the solar heat collection panel 3 and the amount of heat to be input by the absorption chiller 1 or the heating heat exchanger 5 is absorbed, and the efficiency of the air conditioning system 100 is improved.

FIG. 4 shows control when the solar heat is input to the absorption chiller 1 or the heating heat exchanger 5 in the air conditioning system 100 of FIG.
The control shown in FIG. 4 is the same as the control shown in FIG. 3 in terms of operation control when solar heat is used in the absorption refrigerator 1 or the heating heat exchanger 5. However, in the control shown in FIG. 4, the heat medium temperature T ₁ circulating through the solar heat circuit L is set to a temperature “T ₀ + ΔT ₀ ” in order to input solar heat to the absorption refrigerator 1 or the heating heat exchanger 5. (Optimum control of hot water inlet temperature) is not performed.
The control in FIG. 4 gives priority to the promotion of solar heat utilization in the absorption refrigerator 1 or the heating heat exchanger 5 and assumes a case where solar heat is collected at the highest possible temperature by the solar panel 3. Yes.

Also in FIG. 4, as in FIG. 3, the “start” state is the case where the process proceeds to step S14 or step S16 in the start-up control shown in FIG. In such a case, the heat medium temperature T ₁ (heat medium temperature measured by the temperature sensor St1) flowing through the solar heat circuit L is higher than the threshold value T ₀ , and the absorption refrigerator 1 or the heating heat exchanger 5 The solar heat is input to the absorption refrigerator 1 by the three-way valve Va, or the solar heat is input to the heating heat exchanger 5 by the three-way valve Vc.

In step S41, after switching the three-way valve Va and supplying solar heat to the absorption refrigerator 1, or after switching and controlling the three-way valve Vc and supplying solar heat to the heating heat exchanger 5, the solar heat circuit L is switched on. It is determined whether or not a time (predetermined time: for example, 30 seconds to 60 seconds) when the circulating heat medium is in a steady state has elapsed.
If the predetermined time has elapsed after switching control of the three-way valve Va or the three-way valve Vc (YES in step S41), the process proceeds to step S42, and overheat prevention control shown in FIG. 5 is performed. Then, the process proceeds to step S43.
At step S43, the temperature T ₁ of the solar circuit L is equal to or higher than the threshold value T _0.

If high temperatures than the temperature T ₁ is the threshold T ₀ of solar circuit L (Step S43 is YES), the solar heat and determined to be charged into the absorption refrigerating machine 1 or the heating heat exchanger 5, the process proceeds to step S42 The overheat prevention control shown in FIG. 5 is repeated.
If the temperature T ₁ of the solar circuit L the threshold T ₀ or less (step S43 is NO), it is determined that can not be put solar absorption refrigerating machine 1 or the heating heat exchanger 5, the process proceeds to step S44. Then, the process proceeds to step S15 in FIG.

FIG. 5 shows control for preventing the heat medium circulating in the solar heat circuit L from being overheated in the system shown in FIG.
In the control shown in FIG. 5, the operation of the air conditioning system 100 is continued as much as possible when the amount of solar radiation increases and the temperature of the heat medium rises excessively in the solar heat collection panel 3. At the same time, when the limit is reached, the air conditioning system 100 is stopped immediately for safety. Thereby, the heat medium is overheated, and various devices constituting the solar heat circuit L are prevented from being damaged.

In FIG. 5, at the “start” stage, the heat medium temperature T ₄ immediately after the outlet of the solar heat collecting panel 3 is measured by the fourth temperature sensor St _{4. In} step S 51, the heat medium temperature T ₄ is the threshold. It is determined whether or not the value is _higher than the allowable maximum temperature T _4MAX . Here, the allowable maximum temperature _T4MAX , which is a threshold value, is the temperature of the heat medium immediately after the exit of the solar heat collecting panel 3, and when it is below this temperature, it is not necessary to perform overheat prevention control. For example, it is 92 degreeC.
So if high temperatures than the heat medium temperature _{T 4} is the allowable maximum temperature _{T 4MAX} (step S51 YES), the heat storage in the hot water storage tank 4, the process proceeds to step S52.
On the other hand, if the heat medium temperature T ₄ is lower than the allowable maximum temperature T _4MAX (step S51 NO), the overheat prevention control is judged to be unnecessary, the process proceeds to "End", ends the overheat prevention control of Fig. 5 To do. As a result, in the control shown in FIG. 3, the process proceeds from step S36 to step S26 and from step S37 to step S25. Alternatively, in the control shown in FIG. 4, the process proceeds from step S42 to step S43.

5 again, step S52 (the heat medium temperature _{T 4} is the allowable maximum temperature _T than _4MAX High: step S51 YES) in order to recover the heat in the hot water storage tank 4, to operate the pump P2 of the branch circuit LB1. Here, since the heat medium temperature T ₄ is higher than the allowable maximum temperature T _4MAX, for maintaining a stratified state, flows a high-temperature heat medium above the hot water tank 4, the hot water storage tank 4 low-temperature heat medium The on-off valves V1 and V4 are opened, and the on-off valves V2 and V3 are closed. Then, the process proceeds to step S53.
Here, when the amount of heat collected in the solar heat collecting panel 3 is large and more solar heat than required by the absorption chiller 1 or the heating heat exchanger 5 can be collected, the excess solar heat is positively stored in the hot water storage tank. In order to store heat at 4, the three-way valve Vb is proportionally controlled so that more heat medium passes through the heat storage tank 4 at step S53. That is, the heat medium temperature _{T 4} immediately after solar heat collector panel 3, so that a somewhat lower temperature than the allowable maximum temperature _{T 4MAX "T 4MAX -ΔT 4MAX"} proportional way valve Vb. With such proportional control, a larger amount of heat medium passes through the hot water storage tank, and the amount of heat stored in the hot water storage tank 4 is stored in the hot water storage tank 4, so that the solar heat more than that required by the absorption refrigerator 1 or the heating heat exchanger 5 is stored. When heat can be collected, excess solar heat is stored in the hot water tank 4.

In the target value “T _4MAX −ΔT _4MAX ” of the heat medium temperature T ₄ immediately after the solar heat collecting panel 3 by proportional control of the three-way valve Vb, for example, T _4MAX is 92 ° C. and ΔT _4MAX is 10 ° C. That is, the target value of the heat medium temperature _{T 4 "T 4MAX -ΔT 4MAX"} (somewhat lower temperature than the allowable maximum temperature _{T 4MAX)} is, for example, 82 ° C..

In step S54, it is determined whether a temperature higher than the temperature _{"T 4MAX} + _{ΔT 4MAX3"} heating medium temperature _{T 4} immediately after the outlet of the heat collection panel 3 is slightly higher than the allowable maximum temperature _{T 4MAX} of that location. This temperature “T _4MAX + ΔT _4MAX3 ” is a limit temperature when the safety of the air conditioning system 100 is taken into consideration. When the heat medium temperature T ₄ exceeds this temperature, the operation of the air conditioning system 100 is immediately stopped. Temperature. In other words, it is the safety limit temperature.
In the safety limit temperature “T _4MAX + ΔT _4MAX3 ”, for example, T _4MAX is 92 ° C. and ΔT _4MAX3 is 3 ° C. That is, the temperature (safety limit temperature “T _4MAX + ΔT _4MAX3 ”) slightly higher than the allowable maximum temperature T _4MAX is, for example, 95 ° C.

If the heat medium temperature T ₄ immediately after the outlet of the heat _collecting panel 3 is higher than the safety limit temperature “T _4MAX + ΔT _4MAX3 ” (YES in step S54), it is dangerous to continue further operation, so the process proceeds to step S55. Predetermined safety stop measures are taken.
On the other hand, if the heat medium temperature T ₄ immediately after the outlet of the heat _collecting panel 3 is equal to or lower than the safety limit temperature “T _4MAX + ΔT _4MAX3 ” (step S54 is NO), it is determined that the operation of the air conditioning system 100 is still possible. Proceed to step S56.

In step S56, it is determined whether the heat medium temperature _{T 4} immediately after solar heat collector panel 3 is less than the lower temperature than the allowable maximum temperature _{T 4MAX "T 4MAX -ΔT 4MAX2".}
The temperature “T _4MAX −ΔT _4MAX2 ” is the temperature of the heat medium immediately after the solar heat collecting panel 3, and the heat medium flowing through the solar heat circuit L by proportionally controlling the three-way valve Vb and the region below the hot water tank 4. The temperature (threshold temperature) is set such that the solar heat input to the absorption refrigeration machine 1 or the heating heat exchanger 5 does not occur effectively without mixing with the flowing heat medium.

If low temperatures than the heat medium temperature _{T 4} is the threshold temperature _{"T 4MAX -ΔT 4MAX2"} (step S56 is YES), the proportional control of the three-way valve Vb, and a heat medium flowing through the solar circuit L, the hot water storage There is no need to mix the heat medium flowing out from the lower region of the tank 4. Therefore, in step S57, the pump P2 is stopped and the heat medium does not flow out of the hot water storage tank 4 so that the port d and the port e of the heat medium three-way valve Vb are connected 100%. At the same time, the on-off valves V1 and V4 are closed, and the on-off valves V2 and V3 are opened. Then, the process proceeds to “END” in FIG. 5 and the overheat prevention control in FIG. 5 is terminated. As a result, in the control shown in FIG. 3, the process proceeds from step S36 to step S26 and from step S37 to step S25. Alternatively, in the control shown in FIG. 4, the process proceeds from step S42 to step S43.

Here, in the threshold temperature “T _4MAX− ΔT _4MAX2 ”, for example, T _4MAX is 92 ° C. and ΔT _4MAX2 is 15 ° C. That is, the threshold temperature “T _4MAX −ΔT _4MAX2 ” is, for example, 77 ° C.
If the heating medium temperature _{T 4} is the threshold temperature _{"T 4MAX -ΔT 4MAX2"} a temperature above (step S56 is NO), it returns to step S53, and repeats the step S53 and later.

According to the overheat prevention control of FIG. 5, the operation of the air conditioning system 100 can be continued as much as possible even when the solar heat collecting panel 3 is in an overheated state. Moreover, the solar heat collected during the overheating state is stored in the hot water storage tank 4, and the stored heat can be used as solar heat to be input to the absorption refrigerator 1 or the heating heat exchanger 5 when the amount of solar radiation is insufficient. it can.
If the temperature of the heat medium rises to such an extent that the solar heat circuit L is damaged, the air conditioning system 100 can immediately be safely stopped to avoid damage to the device.

FIG. 6 shows the control when the solar radiation amount is insufficient when the solar heat is used in the absorption refrigerator 1 or the heating heat exchanger 5 in the system shown in FIG. 1 and when the insufficient solar radiation amount is recovered thereafter. Shows control.
In the control of FIG. 6, when the amount of heat collected by the heat collection panel 3 decreases due to insufficient solar radiation, the pumps P1 and P2 are stopped, and when the amount of solar radiation recovers thereafter, the pumps P1 and P2 are operated. Has resumed.

In step S61 in FIG. 6, the control unit 10, the temperature difference between the measurement results of the fourth temperature sensor St4 and fifth temperature sensors St5, the outlet temperature T ₄ and the inlet temperature T ₅ of the solar heat collector panel 3 ' It is determined whether or not the value of “T ₄ −T ₅ ” is smaller than the threshold value ΔT ₅ . If the value of the temperature difference “T ₄ −T ₅ ” is smaller than the threshold value ΔT ₅ (YES in step S61), the heat medium is not sufficiently heated by the solar heat collecting panel 3, and therefore the amount of solar radiation is insufficient. Determination is made and the process proceeds to step S62.
On the other hand, if the value of the temperature difference “T ₄ −T ₅ ” is equal to or greater than the threshold value ΔT ₅ (NO in step S61), the amount of solar radiation is not insufficient, and the solar heat collection panel 3 has a sufficient heat medium. It judges that it is heated, advances to “END”, and ends the control of FIG. And it progresses to step S6 from step S15 in FIG. 2, or progresses to step S10 from step S17.

Step S62 waits in until a predetermined time elapses, when a predetermined time has elapsed (step S62 is YES), at step S63, again, the temperature difference between the outlet temperature _{T 4} and the inlet temperature _{T 5} of the solar heat collector panel _{"T 4} It is determined whether or not the value of “−T ₅ ” is smaller than the threshold value ΔT ₅ . If temperature difference “T ₄ −T ₅ ” is smaller than threshold value ΔT ₅ (YES in step S63), it is determined again that the solar radiation is insufficient, and the process proceeds to step S64.
If the value of the temperature difference “T ₄ −T ₅ ” is equal to or greater than the threshold value ΔT ₅ (NO in step S63), the process proceeds to “END”, and the control in FIG. 6 is terminated. And it progresses to step S6 from step S15 in FIG. 2, or progresses to step S10 from step S17.
Here, the temperature difference “T ₄ −T ₅ ” is proportional to the solar thermal energy actually used in the air conditioning (= the amount of heat collected in the solar thermal collection panel × cooling or heating conversion efficiency). And when the solar heat energy which concerns is smaller than pump P1 motive power, it judges that the solar radiation amount is insufficient and solar heat cannot be utilized, and the driving | operation of pump P1 is stopped. On the other hand, if the solar thermal energy is equal to or greater than the power of the pump P1, it is determined that solar heat can be used and the pump P1 is operated. From such a viewpoint, the threshold value ΔT ₅ is determined.

In step S64 (temperature difference “T ₄ −T ₅ ” is smaller than threshold value ΔT ₅ : step S63 is YES), the amount of solar radiation is insufficient, and heating of the heat medium by the solar heat collecting panel 3 is not possible. Since it cannot be expected, both the pump P1 of the solar thermal circuit and the pump P2 of the branch circuit LB1 are stopped, the on-off valves V1, V4 are closed, and the on-off valves V2, V3 are opened. Then, the process proceeds to step S65, by the sixth temperature sensor St6 of measuring the surface temperature _{T 6} of solar heat collector panel 3, the surface temperature _{T 6} of solar heat collector panel 3 is at a temperature higher than the threshold temperature _{T 6STD} Determine whether or not. Here, the threshold value T _6STD is a limit temperature at which the heat medium is heated in the solar heat collecting field _channel 3, and the surface temperature T ₆ of the solar heat collecting panel 3 is _higher than the threshold temperature T _6STD. The determination of whether or not the solar radiation amount has recovered.
The temperature that is determined parameters in step S65 is not limited to the surface temperature T ₆ of solar heat collector panel 3. For example, the fourth heat medium temperature T ₄ immediately after the outlet in the solar heat collector panel 3 measured by the temperature sensor St4 of, can also be used as a decision parameter in step S65. Of course, other temperatures can be used as determination parameters.

If high temperatures than the surface temperature _{T 6} of solar heat collector panel 3 the threshold temperature _{T 6STD} (step S65 is YES), the solar radiation is determined to have recovered. At this stage, since the pumps P1 and P2 are stopped and the heat medium temperature is low, the process proceeds to step S66 and proceeds to step S2 in the start-up control shown in FIG.
On the other hand, if the surface temperature _{T 6} is less than the threshold temperature _{T 6STD} (step S65 is NO), solar radiation, it is determined that the recovered house, step S65 is repeated loop of NO.

FIG. 7 also shows the control when the solar radiation amount is insufficient and the control when the insufficient solar radiation amount is subsequently recovered in the system shown in FIG.
However, the control shown in FIG. 7 is different from the control shown in FIG. 6 in the procedure for determining whether or not the solar radiation amount has recovered.

From step S71 to step S74 in FIG. 7, the same control as in step S61 to step S64 in FIG. 6 is performed.
In step S75 of FIG. 7, counting of the fixed time t2 is started, and when the fixed time t2 has elapsed (YES in step S76), the fixed time t2 is reset in step S77. Here, the fixed time t2 is appropriately set as a time sufficient for the amount of solar radiation to recover.

In the next step S78, the pump P1 of the solar heat circuit L is operated, and in step S79, it is determined whether or not a predetermined time t2 has elapsed. The predetermined time t2 is set as a time for warm water to circulate through the solar thermal circuit L in two or more orders. If the predetermined time t2 has elapsed (YES in step S79), the process proceeds to step S80.
The control for determining whether or not the amount of solar radiation in step S75 and subsequent steps in FIG. 7 in FIG. 7 is not possible because the temperature sensor St6 cannot be attached to the surface of the solar heat collection panel 3, for example. It conducted the surface temperature T ₆ of the case can not control a parameter temporarily drives the pump P1, the temperature difference between the outlet temperature T ₄ and the inlet temperature T ₅ of the solar heat collector panel "T ₄ -T ₅ ), the recovery of the solar radiation amount is determined.

In step S80, whether the control unit 10, an outlet temperature _{T 4} of the solar heat collector panel, measuring the inlet temperature _{T 5,} the temperature difference _"T 4 -T ₅ 'is greater than the threshold value _{[Delta] T 4-1} Judge whether or not.
If the temperature difference “T ₄ -T ₅ ” between the outlet temperature T ₄ of the solar heat collecting panel and the inlet temperature T ₅ is larger than the threshold value ΔT _4-1 (YES in step S80), the amount of solar radiation is recovered. Then, it is determined that the heat medium can be sufficiently heated by the solar heat collecting panel 3, the process proceeds to “END”, and the control relating to the determination of insufficient solar radiation amount and the determination of recovery ends. And it progresses to step S6 from step S15 in FIG. 2, or progresses to step S10 from step S17.

On the other hand, if the temperature difference “T ₄ −T ₅ ” between the outlet temperature T ₄ and the inlet temperature T ₅ of the solar heat collection panel is equal to or smaller than the threshold value ΔT _4-1 (NO in step S80), the amount of solar radiation is recovered. It is determined that the pump P1 is not in operation, the pump P1 is stopped (step S81), and step S75 and subsequent steps are repeated.
Here, the temperature difference “T ₄ −T ₅ ” is proportional to the solar thermal energy actually used in the air conditioning (= the amount of heat collected in the solar thermal collection panel × cooling or heating conversion efficiency). And when the solar heat energy which concerns is smaller than pump P1 motive power, it judges that the solar radiation amount is insufficient and solar heat cannot be utilized, and the driving | operation of pump P1 is stopped. On the other hand, if the solar thermal energy is equal to or greater than the power of the pump P1, it is determined that solar heat can be used and the pump P1 is operated. From such a viewpoint, the threshold value ΔT _4-1 is determined.

  According to the solar radiation shortage determination control in FIGS. 6 and 7, since the solar heat collection panel 3 stops the pump P1 when the solar radiation is insufficient and the heat medium cannot be heated, the heat medium cannot be heated. When it is not necessary to circulate the heat medium in the solar heat circuit L, unnecessary power consumption of the pump P1 can be suppressed.

FIG. 8 shows the control when the absorption chiller 1 or the heating heat exchanger 5 is stopped in the system shown in FIG.
In step S91 of FIG. 8, a stop signal for the absorption refrigerator 1 or the heating heat exchanger 5 is transmitted.
In step S92, it is determined whether or not the time required to close the three-way valve Va or the three-way valve Vc ("predetermined time" in step S92) has elapsed. If the predetermined time has elapsed (YES in step S92). In step S93, the pumps P1 and P2 are stopped. Then, the three-way valve Vb is controlled so that the heat medium from the hot water tank 4 does not flow in a region closer to the heat collection panel 3 than the branch point B1 of the solar heat circuit L. That is, 100% of the heat medium that has flowed through the region closer to the absorption refrigerator 1 than the branch point B1 of the solar thermal circuit L flows in the region closer to the heat collecting panel 3 than the branch point B1 of the solar thermal circuit L.

In step S93, the on-off valves V1 and V4 are further closed, and the on-off valves V2 and V3 are opened. And the control in the case of stopping the absorption refrigerator 1 or the heating heat exchanger 5 is complete | finished.
Here, closing the on-off valves V1 and V4 and opening the on-off valves V2 and V3 is a normal position of the on-off valves V1 to V4 when the absorption refrigerator 1 or the heating heat exchanger 5 is stopped.

FIG. 9 shows control for storing heat when the amount of solar radiation is sufficient while the absorption chiller 1 or the heating heat exchanger 5 is stopped in the system shown in FIG.
In the control shown in FIG. 9, heat storage is stopped when the amount of solar radiation is insufficient.

In step S101 of FIG. 9, the control unit 10, the surface temperature _{T 6} of solar heat collector panel 3, it is determined whether or not higher than the threshold value _{T 6STD.} Then, until the surface temperature _{T 6} of solar heat collector panel 3 becomes high than the threshold _{T 6STD,} waiting (loop of steps S101 is NO).
Here, the threshold value T _6STD is a parameter for determining whether or not sufficient solar radiation exists, in other words, a parameter for determining whether or not heat can be stored in the hot water tank 4. This is the surface temperature of the panel 3.
The temperature that is determined parameters in step S101 is not limited to the surface temperature T ₆ of solar heat collector panel 3. For example, the fourth heat medium temperature T ₄ immediately after the outlet in the solar heat collector panel 3 measured by the temperature sensor St4 of, can also be used as a decision parameter in step S101. Of course, other temperatures can be used as determination parameters.

If high temperatures than the surface temperature _{T 6} is the threshold _{T 6STD} the solar heat collector panel 3 (step S101 YES), the process proceeds to step S102. In step S102, it is determined that heat storage in the hot water storage tank 4 is possible, the pump P1 and the pump P2 are started, the port c and the port e of the three-way valve Vb are communicated, and the solar heat circuit L at the branch point B1. All of the heat medium is passed to the branch circuit LB1 side. At the same time, the on-off valves V1 and V4 are opened, the on-off valves V2 and V3 are closed, and the solar heat collected by the solar heat collecting panel 3 is stored while the stratified state in the hot water storage tank 4 is maintained.

Next, in step S103, whether or not than the temperature _{"T 4MAX} + ΔT _4MAX3" which gave margin _{[Delta] T 4MAX3} the heat medium temperature _{T 4} immediately after solar heat collection panel outlet 3o the highest allowable value _{T 4MAX} is hot to decide. If the heat medium temperature T ₄ is higher than the temperature “T _4MAX + ΔT _4MAX3 ” (YES in step S103), if the operation is continued further, it is determined that the heat medium is overheated and dangerous, and step S104 is performed. Then, the air conditioning system 100 is safely stopped.
On the other hand, if the heat medium temperature T ₄ is equal to or lower than the temperature “T _4MAX + ΔT _4MAX3 ” (NO in step S103), it is determined that the heat medium is not overheated and there is no danger, and the process proceeds to step S105.

In step S105, the control unit 10 determines that the temperature difference “T ₄ −T ₅ ” between the outlet temperature T ₄ of the solar heat collecting panel and the inlet temperature T ₅ is smaller than a threshold value ΔT ₅ (for example, 1 ° C.). Determine whether or not. If the value of the temperature difference “T ₄ −T ₅ ” is equal to or greater than the threshold value ΔT ₅ (NO in step S105), it is determined that the solar radiation is good and the heat medium is well heated by the heat collecting panel 3. Step S103 and subsequent steps are repeated.
On the other hand, if the value of the temperature difference “T ₄ −T ₅ ” is smaller than the threshold value ΔT ₅ (YES in step S105), the amount of solar radiation is insufficient, and the heat medium is not heated by the heat collecting panel 3. The process proceeds to step S106.

In step S106, the process waits until a predetermined time elapses. Here, the “predetermined time” in step S106 is set as a time sufficient for the recovery of solar radiation. When the predetermined time has elapsed (YES in step S106), in step S107, the value of the temperature difference “T ₄ −T ₅ ” between the outlet temperature T ₄ and the inlet temperature T ₅ of the solar heat collecting panel again becomes the threshold value ΔT. It is determined whether it is less than ₅ .
If the value of the temperature difference “T ₄ −T ₅ ” is less than the threshold value ΔT ₅ (YES in step S107), it is determined that the amount of solar radiation has not recovered, and the process proceeds to step S108.
On the other hand, if the value of the temperature difference “T ₄ −T ₅ ” is equal to or greater than the threshold value ΔT ₅ (NO in step S107), it is determined that the amount of solar radiation has recovered, and step S103 and subsequent steps are repeated.

In step S108 (the value of the temperature difference “T ₄ −T ₅ ” is less than the threshold value ΔT ₅ : step S107 is YES), the surface temperature T ₆ of the solar heat collecting panel 3 is _higher than the threshold temperature T _6STD. Judge whether there is.
If high temperatures than the surface temperature _{T 6} is the threshold temperature _{T 6STD} the solar heat collector panel 3 (steps S108 YES), it is determined that the amount of solar radiation is restored, and repeats step S103 and later.
On the other hand, if the surface temperature _{T 6} is less than the threshold value _{T 6STD} (step S108 is NO), the process goes to step S109.
The temperature that is determined parameters in step S108 is not limited to the surface temperature T ₆ of solar heat collector panel 3. For example, the fourth heat medium temperature T ₄ immediately after the outlet in the solar heat collector panel 3 measured by the temperature sensor St4 of, can also be used as a decision parameter in step S108. Of course, other temperatures can be used as determination parameters.

In step S109, it is determined that the amount of solar radiation is still insufficient and heat cannot be stored in the hot water tank 4, and the pumps P1 and P2 are stopped and the circulation of the heat medium is stopped. And the port c and the port e of the three-way valve Vb are connected, and the heat medium of the solar thermal circuit L is all flowed to the branch circuit LB1 side at the branch point B1. Further, the on-off valves V1 and V4 are closed, the on-off valves V2 and V3 are opened, the process returns to step S101, and step S101 and subsequent steps are repeated again.
The positions of the on-off valves V1 to V4 after the end of step S109 are normal positions when the absorption chiller 1 is stopped.

10 also stores heat in the hot water tank 4 if the amount of solar radiation is sufficient while the absorption refrigerator 1 or the heating heat exchanger 5 is stopped in the system shown in FIG. When the amount is insufficient, the control for stopping the heat storage is shown.
However, the control shown in FIG. 10 is different from the control shown in FIG. 9 in the procedure for determining whether or not the solar radiation amount has recovered.

Steps S111 to S119 in FIG. 10 are the same as the controls in steps S101 to S109 in FIG. However, in step S111 in FIG. 10, processing similar to step S126 described later may be performed.
Step S120 and subsequent steps in FIG. 10 are different from the control in FIG.
In step S120 of FIG. 10, counting of the predetermined elapsed time t2 is started. If the predetermined elapsed time t2 has elapsed (YES in step S121), the predetermined elapsed time t2 is reset in step S122. Here, the predetermined elapsed time t2 is set as a time sufficient for the amount of solar radiation to recover.
In step S123, the pump P1 of the solar thermal circuit L is operated. Then, it is determined whether or not a predetermined time period (a time period during which the hot water circulates through the solar thermal circuit L two or more times) has elapsed (step S124). If the predetermined time (the time during which hot water circulates through the solar thermal circuit L at least two times) has elapsed (YES in step S124), the process proceeds to step S125.

At step S125, the or control unit 10 measures an outlet temperature _{T 4} and the inlet temperature _{T 5} of the solar heat collector panel 3, the temperature difference _"T 4 -T _5" is larger than the threshold value _{[Delta] T 4-1} Judge whether or not. If the temperature difference “T ₄ -T ₅ ” between the outlet temperature T ₄ and the inlet temperature T ₅ of the solar heat collecting panel is larger than the threshold value ΔT _4-1 (YES in step S125), the amount of solar radiation is recovered. Then, it is determined that the heat medium can be heated by the solar heat collecting panel 3, and Steps S111 and after are repeated.
On the other hand, if the temperature difference “T ₄ −T ₅ ” between the outlet temperature T ₄ and the inlet temperature T ₅ of the solar heat collecting panel is equal to or smaller than the threshold value ΔT ₄₋₁ (NO in step S125), the amount of solar radiation is recovered. However, it is determined that the heat medium cannot be heated by the solar heat collecting panel 3, the pump P1 is stopped (step S126), and step S120 and subsequent steps are repeated.

In the control of FIGS. 9 and 10, even when the absorption chiller 1 or the heating heat exchanger 5 is stopped, if solar heat can be collected, heat is stored in the hot water tank 4, so the amount of solar radiation is insufficient. In this case, or when the heat medium temperature in the solar heat circuit L is low immediately after the pump P1 is started, the heat stored in the hot water storage tank 4 can be input to the absorption refrigerator 1 or the heating heat exchanger 5.
In other words, by such control, the solar heat amount imbalance caused by the lack of synchronization between the solar radiation amount and the cooling / heating load communicating with the absorption refrigerator 1 or the heating heat exchanger 5 is absorbed, and the efficiency of the air conditioning system is improved. I can do it.
9 and 10 is control when the absorption chiller 1 or the heating heat exchanger 5 is stopped, and the absorption chiller 1 or the heating heat exchanger 5 is started to operate. If so, the process immediately returns to the startup routine of FIG.

FIG. 11 shows anti-freezing control for preventing the heat medium circulating in the solar heat circuit L from freezing while the absorption refrigerator 1 or the heating heat exchanger 5 is stopped.
In step S131 of FIG. 11, the control unit 10, the heat medium temperature _{T 4} immediately after solar heat collector panel 3 is equal to or lower than the minimum allowable value _{T 4min.}
Here, the minimum allowable value _T4MIN is a temperature at which the heat medium in the solar heat circuit L may freeze if the heat medium temperature immediately after the solar heat collecting panel 3 is lower than this temperature. It differs depending on the type of the heat collecting panel 3.

If low temperatures than the heat medium temperature _{T 4} immediately after solar heat collector panel 3 is the lowest allowable value _{T 4min} (step S131 is YES), it is determined that the heat medium is likely to freeze, the process proceeds to step S133.
On the other hand, if the heat medium temperature _{T 4} immediately after solar heat collector panel 3 is the lowest allowable value _{T 4min} more (step S131 is NO), at step S132, the surface temperature _{T 6} of solar heat collector panel 3 surface temperature minimum allowed It is determined whether the temperature is lower than the value _T6MIN . The surface temperature minimum allowable value _T6MIN is the surface temperature of the solar heat collecting panel 3, and when the temperature is lower than this temperature, the heat medium in the solar heat circuit L may be frozen.

If low temperatures than the surface temperature _{T 6} is the surface temperature minimum allowed value _{T 6min} solar heat collector panel 3 (step S132 is YES), the heat medium is determined that there is a possibility of freezing, the process proceeds to step S133.
On the other hand, if the surface temperature _{T 6} is the surface temperature minimum allowable value _{T 6min} more (step S132 is NO), a possibility that the heat medium is frozen, it is determined that there is no, the process returns to step S131.
In step S133, since the heat medium may be frozen, the pump P1 is activated to circulate the heat medium, thereby preventing the heat medium from freezing. At the same time, the pump P2 is also started to increase the heat capacity of the entire heat medium. Then, the three-way valve Vb is switched and the heat medium of the solar heat circuit L is caused to flow to the 100% branch circuit LB1 side at the branch point B1, and the process proceeds to step S134.
In step S134, whether the control unit 10 is higher than the temperature _{"T 4MIN} + _{ΔT 4MIN"} the temperature _{T 4} of the solar heat collector panel 3 after the heating medium plus margin _{[Delta] T 4min} the minimum allowable temperature _{T 4min} not Determine whether.

If high temperatures than the temperature _{T 4} of the solar heat collector panel 3 just after the heating medium temperature _{"T 4MIN} + _{ΔT 4MIN"} (step S134 is YES), the process proceeds to the step S135. On the other hand, if the temperature T ₄ of the heat medium immediately after the solar heat collecting panel 3 is equal to or lower than the temperature “T _4MIN + ΔT _4MIN ” (NO in step S134), it is determined that the heat medium may still freeze, S134 and subsequent steps are repeated.
In step S135 (the temperature T ₄ of the heat medium immediately after the solar heat collection panel 3 is higher than the temperature “T _4MIN + ΔT _4MIN ”: step S134 is YES), the control unit 10 determines the surface temperature T ₆ of the solar heat collection panel 3. but determines whether than the temperature obtained by adding a margin [Delta] T _6min the minimum allowable value _{T 6min} "lowest allowable value _{T 6MIN} + _{ΔT 6MIN"} is hot.

If the surface temperature T ₆ of the solar heat collecting panel 3 is higher than the temperature “minimum allowable value T _6MIN + ΔT _6MIN ” (YES in step S135), it is determined that the heat medium is not likely to freeze, and the process _proceeds to step S136. move on.
On the other hand, if the surface temperature T ₆ of the solar heat collecting panel 3 is equal to or lower than the temperature “minimum allowable value T _6MIN + ΔT _6MIN ” (NO in step S135), it is determined that the heat medium may still freeze, S134 and subsequent steps are repeated.

Step S136 (the surface temperature _{T 6} temperature "lowest allowable value _{T 6MIN} + _{ΔT 6MIN"} of solar heat collector panel 3 hotter than: step S135 is YES) in, the heat medium is determined that there is no risk of freezing, The pumps P1 and P2 are stopped, the port d and the port e of the three-way valve Vb are communicated, the heat medium of the solar heat circuit L is bypassed the 100% hot water tank 4 at the branch point B1, and the process returns to step S131. Then, step S131 and subsequent steps are repeated again.

According to the freeze prevention control of FIG. 11, when there is a possibility that the heat medium freezes when the absorption refrigerator 1 or the heating heat exchanger 5 is stopped, the heat medium is circulated by operating the pumps P1 and P2. To prevent freezing.
By preventing the heat medium circulating in the solar thermal circuit L from freezing, damage to the solar thermal circuit L and various devices interposed in the solar thermal circuit L can be avoided.

FIG. 12 shows heat shock prevention control at the time of startup.
In a state where the amount of solar radiation is large, the solar heat circuit L, particularly the solar heat collecting panel 3 is heated to a high temperature, and immediately after the absorption refrigerator 1 or the heating heat exchanger 5 is activated (step S1 in FIG. 2), heat is immediately generated. When the medium is flowed, the heat medium evaporates instantaneously, the pressure explosively increases, and various devices in the solar heat circuit L may be damaged (so-called “heat shock”).
FIG. 12 shows control (heat shock prevention control) for preventing the above-mentioned “heat shock” in advance when the activation signals of the absorption refrigerator 1 and the heating heat exchanger 5 are generated (step S1). ing.

12, firstly, to measure the surface temperature T ₆ of solar heat collector panel 3, and a heat medium temperature T ₄ in the region between the solar heat collector panel 3 and a pressure sensor 7 (step S141).
Although not explicitly shown in FIG. 12, it is a premise that the heat medium pump P1 is stopped.
Here, in FIG. 12, the surface temperature T ₆ of the solar heat collecting panel 3 and the heat medium temperature T ₄ in the outlet side region of the solar heat collecting panel 3 are shown as control parameters. , if the temperature at which it can be determined that overheating of the solar circuit L, and the T _6, T ₄ is not limited.

Then, the temperature T ₆ is _compared with a threshold value T _6MAX (threshold value causing a heat shock at the surface temperature of the solar heat collecting panel 3) (step S142), and the temperature T ₄ and the threshold value T _4MAX (solar heat collecting panel) are compared. 3 is compared with the heat medium temperature in the outlet side region 3 (threshold causing heat shock) (step S143).
In FIG. 12, comparison between the temperature _{T 6} and the threshold _{T 6MAX} (step S142), it has become the order of the comparison (step S143) and the temperature _{T 4} and the threshold _{T 4MAX,} solar circuit L The order in which the temperature at which the overheat state can be determined and the threshold value are compared is arbitrary.
The comparison between the temperature _{T 6} and the threshold _{T 6MAX,} may perform a comparison between the temperature _{T 4} and the threshold _{T 4MAX} simultaneously.

If any one of the temperatures T ₆ and T ₄ is higher than the threshold value (any of steps S142 and S143 is YES), the process proceeds to step S144. In step S114, the process waits until a predetermined time elapses (NO loop in step S144). If the predetermined time elapses (YES in step S144), the process returns to step S141 and repeats step S141 and subsequent steps again.
In the loop that returns to step S141 via step S144, it is determined that there is a possibility of causing a heat shock, the heat medium pump P1 is not operated, and the heat medium is not allowed to flow to the solar heat circuit L.
If the temperatures T ₆ and T ₄ are both below the threshold value (NO in both steps S142 and S143), it is determined that there is no fear of heat shock, and the heat medium pump P1 is immediately operated (step S21). . Then, the process proceeds to step S2 in FIG.

Next, control during a power failure will be described with reference to FIG.
There are three types of power outages: “instantaneous power outage” when the power outage is instantaneous, “short time outage” during which the power outage is short, and “power outage over a long period of time more than a short time outage”. There are types.
The above three types of power outage duration relationship are:
“Instantaneous power outage <Short-time power outage <Power outage over a long time more than short-time power outage”.

Here, “instantaneous power outage” means a power outage that is short enough that crystallization does not occur even if the absorption chiller 1 is powered down during cooling operation without stopping after diluting the absorbing solution. Means.
“Short-time power failure” refers to a power failure that does not cause a heat shock even if the heat medium is circulated immediately after power recovery when the heat medium circulation in the solar heat circuit L is stopped due to a power failure. I mean.

In step S151 (already in a power failure state) in FIG. 13, the control unit 10 determines whether the cooling operation was performed before the power failure or the heating operation was performed. When the cooling operation is performed before the power failure, the process proceeds to step S152, and when the heating operation is performed before the power failure, the process proceeds to step S155.
In step S152, the control unit 10 determines whether or not the power failure is a momentary power failure. If a momentary power failure occurs during the cooling operation of the absorption refrigerator 1 (YES in step S152), after returning from power recovery, the operation is resumed in the same state as before the power failure (step S157). ).

On the other hand, when it is not a momentary power failure (step S152 is NO), an operation of diluting the absorbing solution is performed before the absorption refrigerator 1 is stopped in order to prevent crystallization in the absorption refrigerator 1. Then, the control unit 10 determines whether or not the power failure corresponds to “short-time power failure” (step S153).
When the power failure corresponds to a “short-time power failure”, that is, when the time of the power failure is a short time that does not cause a problem such as a heat shock when the air conditioning system 100 resumes operation (YES in step S153). When the power is restored from the power failure, the operation of the heat medium pump P1 is immediately resumed (step S158).

On the other hand, when the power failure is longer than the short-time power failure (NO in step S153), the heat medium is circulated immediately after the power recovery, while the circulation of the heat medium in the solar heat circuit L is stopped due to the power failure. In addition, the heat medium is heated to a high temperature, and heat shock may occur in the solar heat circuit L.
Therefore, in step S154, the operation is resumed according to the operation resumption sequence determined for each type of air conditioning system.

When the heating operation is being performed (“heating operation” in step S151), the process proceeds to step S155. In the case of the heating heat exchanger 5, unlike the absorption refrigerator 1, there is no fear of crystallization. Therefore, even if a power failure continues for a longer time than a momentary power failure, it is not necessary to stop the absorption refrigerator 1 after diluting the absorbing solution.
Therefore, in step S155, it is determined whether or not there is a short-time power outage. If a short-time power outage is detected (YES in step S155), there is no problem of heat shock. The heating operation is resumed in the same state (step S156).

On the other hand, if the power outage is longer than the short-time power outage (NO in step S155), if the heat medium is circulated immediately after power recovery, the circulation of the heat medium in the solar heat circuit L is stopped by the power outage. In the meantime, the heat medium is heated to a high temperature, and heat shock may occur in the solar heat circuit L.
Therefore, the process proceeds to step S154, and the operation is restarted according to the operation restart sequence determined for each type of the air conditioning system 100, and the control ends.

When the control unit 10 is equipped with a battery, it is possible to determine “instantaneous power outage” and “short-time power outage”. Control is not possible, and “instantaneous power outage” and “short-time power outage” cannot be determined.
If “instantaneous power failure” and “short-time power failure” cannot be determined, “NO” is determined in steps S152 and S153.

Although the control at the time of start-up in the illustrated embodiment has been described with reference to FIG. 2, the control at the time of start-up can be as shown in FIG.
Immediately after activation of the absorption refrigerator 1 or the heating load, there is a case where strong solar radiation cannot be expected. In such a case, the control of FIG. 14 performs intermittent operation or intermittent operation rather than continuous operation of the heat medium circulation pump P1 when the temperature of the heat medium circulating through the solar heat circuit L is increased. As a result, while saving the driving power of the pump P1 or the conveying power of the heat medium, the heat medium temperature is increased to a threshold value T ₀ that is acceptable at the absorption refrigerator 1 side or the heating heat exchanger 5 side. Let it warm.

In FIG. 14, the absorption refrigerator 1 is driven at step S161. In step S162, the fourth temperature sensor St4 measures the heat medium temperature T ₄ immediately after the outlet in the solar heat collector panel 3 determines whether it is hotter than the threshold value T _0.
If high temperatures than the heat medium temperature _{T 4} threshold _{T 0} immediately after the exit (step S162 is YES), the process proceeds to step S163, to operate the heat medium circulation pump P1.
If the heat medium temperature _{T 4} the threshold _{T 0} or less immediately after the exit (step S162 is NO), repeats step S162 (loop of step S162 is NO).
Here, the parameter to be compared with the threshold T ₀ at step S162, it is not limited to the heat medium temperature T ₄ immediately after the outlet in the solar heat collector panel 3. For example, instead of the heat medium temperature T ₄ , the surface temperature T ₆ of the solar heat collecting panel 3 may be measured and compared with the threshold value T ₀ .

After operating the pump P1 in step S163, it is determined whether or not a predetermined time has elapsed since the pump P1 was operated in step S164. Here, the “predetermined time” is determined on a case-by-case basis according to system specifications and the like.
If the predetermined time has passed (Step S164 is YES), the process proceeds to step S165, and measures the heat medium temperature T ₄ immediately after the outlet in the solar heat collector panel 3 again, whether it is higher than the threshold value T ₀ Determine whether. Also in step S165, and measures the surface temperature T ₆ of solar collecting panel 3 in place of the heat medium temperature T ₄ immediately after the outlet in the solar heat collector panel 3, may be compared with the threshold value T _0.
If the heat medium temperature T ₄ (or the surface temperature T ₆ of the solar heat collection panel 3) immediately after the exit of the solar heat collection panel 3 is higher than the threshold value T ₀ (YES in step S 165), the process proceeds to step S 166. It is determined whether or not a predetermined time has passed again. If the predetermined time has not elapsed (step S165 is NO), steps S165 and S166 are repeated (step S165 is NO loop).

If the heat medium temperature T ₄ (or the surface temperature T ₆ of the solar heat collection panel 3) immediately after the exit of the solar heat collection panel 3 is equal to or lower than the threshold value T ₀ (step S165 is NO), the process proceeds to step S168. Stop the pump P1.
That is, when attention is paid to the heat medium circulation pump P1, the heat medium temperature T ₄ immediately after the exit of the solar heat collection panel 3 (or the surface temperature T ₆ of the solar heat collection panel 3) is higher than the threshold value T _0. However, the operation is stopped when the heat medium temperature T ₄ (or the surface temperature T ₆ of the solar heat collecting panel 3) becomes equal to or lower than the threshold value T ₀ after a predetermined time has elapsed. . Therefore, until the entire heat medium circulating through the solar circuit L becomes high than the threshold value T _0, the pump P1 will be repeated and stopping operation (intermittent or intermittently operated).

  If the predetermined time has elapsed in step S166 (YES in step S166), the process proceeds to step S167, and the operation control shown in FIG. 3 (operation control when performing hot water inlet temperature optimization control) or the operation shown in FIG. Control (operation control when hot water inlet temperature optimization control is not performed) is performed.

  In the system shown in FIG. 1, the control shown in FIGS. 2 to 5, the control shown in FIG. 6 or 7, the control shown in FIG. 8, the control shown in FIG. 9 or 10 and the control shown in FIG. It is possible to execute.

  It should be noted that the illustrated embodiment is merely an example, and is not a description to limit the technical scope of the present invention.

The block diagram of embodiment of this invention. The flowchart which shows the control at the time of starting of embodiment of this invention. The flowchart which shows the hot water inlet temperature optimal control in the case of supplying solar heat to an absorption refrigerator with embodiment of this invention. The operation control flowchart in the case of supplying solar heat to an absorption refrigerating machine, without performing hot water inlet temperature optimal control in embodiment of this invention. The flowchart which shows the control which prevents the heating of the heat medium which flows through a solar-heat circuit, when putting solar heat into an absorption refrigerator with embodiment of this invention. The flowchart which shows control when the solar radiation amount is insufficient when the solar heat is supplied to the absorption refrigerator in the embodiment of the present invention and when the insufficient solar radiation amount is recovered. The flowchart which shows the modification of the control of FIG. The flowchart which shows the control which stops an absorption refrigerator with embodiment of this invention. The flowchart which shows the control which collects solar heat while the absorption refrigerator is stopped in embodiment of this invention, and stops heat collection, when the amount of solar radiation is insufficient. The flowchart which shows the modification of the control of FIG. The flowchart which shows the freeze prevention control of the heat medium which circulates through a solar-heat circuit, while the absorption refrigeration machine has stopped in embodiment of this invention. The flowchart which shows the control which prevents a heat shock when the starting signal of an absorption refrigerator is generated in the embodiment of the present invention. The flowchart which shows the control at the time of the power failure of embodiment of this invention. FIG. 3 is a flowchart showing control at the time of activation according to the embodiment of the present invention, which is different from FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Absorption type refrigerator 2 ... Solar heat exchanger (1st heat exchanger)
3 ... Solar collector / solar collector panel 4 ... Hot water tank 5 ... Second heat exchanger 7 ... Pressure sensor 8 ... Expansion tank 9 ... Release valve 10 ... Control unit B1 ... first branch point L ... solar heating circuit LB1 ... first branch circuit Lh ... heating hot water line P1 ... first pumps V1, V2, V3, V4 ..Open / close valve Vb ... Three-way valve

Claims (8)

  Solar heat circuit (L), absorption chiller (1), absorption solution circulating in absorption chiller (1), and heat medium circulating in solar heat circuit (L) perform first heat exchange An exchanger (2) and a control device (10) are provided, and the solar heat circuit (L) is connected to a solar heat collector (3) and a first pump (P1) for circulating a heat medium in the solar heat circuit. A branch circuit (LB1) branching (B1) from the solar thermal circuit (L) and joining (Vb) is provided, and the branch circuit (LB1) includes a stratified hot water tank (hot water tank 4) and a branch circuit. (LB1) is provided with a second pump (P2) for allowing the heat medium to flow therethrough, and the control device (10) maintains a stratified state in the hot water storage tank (4) while maintaining the hot water storage tank ( 4) A machine that stores solar heat in the inside or releases the amount of heat stored in the hot water tank (4) to the solar heat circuit (L). When, the air conditioning system, wherein a heat medium circulating through the solar circuit (L) has a function of switching the flow of the heat medium so as not to over and or through the hot water storage tank (4).   At the junction of the branch circuit (LB1) and the solar thermal circuit (L), a flow path switching device (Vb) that adjusts the flow rate and switches the flow path is disposed, and the branch circuit (LB1) is opened and closed first. The first branch line (Lb1) intervening the valve (V1) and the second branch line (Lb2) intervening the second on-off valve (V2) branch to the first branch line ( Lb1) communicates with the upper area of the hot water tank (4), and the second branch line (Lb2) communicates with the lower area of the hot water tank (4). The hot water tank (4) and the solar heat circuit (L ) And a junction (Vb) with a third branch line (Lb3) with a third on-off valve (V3) and a fourth branch with a fourth on-off valve (V4) Line (Lb4) is provided, and the region above the hot water tank (4) is connected to the solar thermal circuit (L) via the third branch line (Lb3). The region below the hot water tank (4) communicates with the junction (Vb) with the solar thermal circuit (L) via the fourth branch line (Lb4), Based on the temperature of the heat medium flowing through the solar heat circuit (L) and the temperature of the heat medium in the hot water tank (4), the control device (10) is configured to switch between the first on-off valve to the fourth on-off valve (V1 to V4). The air conditioning system according to claim 1, wherein the air conditioning system has a function of performing an opening / closing control of the second pump (P2) and a switching control of the flow path switching device (Vb).   The control device (10) stores the first on-off valve (V1) and the fourth on-off valve (4) when the amount of heat held by the heat medium flowing through the solar heat circuit (L) is stored in the hot water storage tank (4). V4) is opened, the second on-off valve (V2) and the third on-off valve (V3) are closed, and the amount of heat stored in the hot water tank (4) is supplied to the solar heat circuit (L). The second on-off valve (V2) and the third on-off valve (V3) are opened, and the first on-off valve (V1) and the fourth on-off valve (V4) are closed. 2 air conditioning system. A first temperature sensor (St1) that measures the temperature (T ₁ ) of the heat medium flowing through the region of the solar heat collector outlet (3o) side of the first heat exchanger (2) in the solar heat circuit (L). And a branch point (B1) between the second temperature sensor (St2) for measuring the temperature (T ₂ ) of the heat medium in the region above the hot water tank (4) and the branch circuit (LB1) in the solar thermal circuit (L) And a third temperature sensor (St3) that measures the temperature (T ₃ ) of the heat medium flowing through the region closer to the first heat exchanger (2), and the control device (10) includes an absorption refrigerator After (1) is activated and the first pump (P1) is activated, the heat medium temperature (T ₁ ) measured by the first temperature sensor (St1) heats the absorbing solution flowing through the absorption refrigerator (1). in that it is possible threshold _{(T 0)} or less, a second temperature sensor (St2) Measuring the hot water storage tank (4) of the heating medium temperature (T ₂₎ is the case of the third heat medium temperature (T ₃₎ measured by the temperature sensor (St3) below stops the second pump (P2) The air conditioning system according to claim 3, which has a function of controlling the flow path switching device (Vb) so that the heat medium flowing through the solar heat circuit (L) does not flow into the branch circuit (LB1). The control device (10) has a threshold (T ₀ ) at which the heat medium temperature (T ₁ ) measured by the first temperature sensor (St1) can heat the absorbing solution flowing through the absorption refrigerator (1). The heat medium temperature (T ₂ ) in the hot water storage tank (4) measured by the second temperature sensor (St2) is lower than the heat medium temperature (T ₃ ) measured by the third temperature sensor (St3). When the temperature is high, the second pump (P2) is operated, and the flow rate switching device (Vb) is controlled to proportionally control the flow rate of the heat medium flowing through the solar heat circuit (L) through the hot water tank (4). Then, the heat medium temperature (T ₁ ) measured by the first temperature sensor (St1) is controlled to be a threshold value (T ₀ ) that can heat the absorbing solution flowing through the absorption refrigerator (1). The air conditioning system of Claim 4 which has a function. A first temperature sensor (St1) for measuring the temperature (T ₁ ) of the heat medium flowing in the region closer to the outlet (3o) of the solar heat collector than the first heat exchanger (2); (10) is a predetermined threshold value (T ₀ ) at which the heat medium temperature (T ₁ ) measured by the first temperature sensor (St ₁ ) can heat the absorbing solution flowing through the absorption refrigerator (1). When the temperature (ΔT ₀ ) is higher than the temperature (T ₀ + ΔT ₀ ), the heat transfer medium that controls the flow path switching device (Vb) and flows through the solar heat circuit (L) From a threshold value (T ₀ ) that heats the absorbing solution flowing through the absorption chiller (1) by controlling the flow rate through it proportionally and the heat medium temperature (T1) measured by the first temperature sensor (St1). Has a function of controlling the temperature so as to become high by a predetermined temperature (ΔT ₀ ). The air conditioning system according to any one of?   A second branch circuit (LB2H) branching (B2) from the solar heat circuit (L) and joining (Vc) to the solar heat circuit (L) via the second heat exchanger (5) is interposed. The second heat exchanger (5) has a function of exchanging heat between the heat medium flowing through the solar heat circuit (L) and the hot water flowing through the hot water line (Lh), and the hot water line (Lh) is a heating load. The air conditioning system according to any one of claims 1 to 6, wherein the air conditioning system is in communication with the air conditioning system.   The control device (10) communicates the solar heat circuit (L) with the first heat exchanger (2) when performing a cooling operation, but bypasses the second heat exchanger (5). When the heating operation is performed, the solar heat circuit (L) communicates with the second heat exchanger (5), but the first heat exchanger (2) has a function of bypassing. The air conditioning system according to claim 7.

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