JPH1194391A - Controller and control method for starting number of absorption cold water/hot water generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a controller for cold water/hot water generator in which the number of generators to be started can be set by operating a cooling tower for a specified time before starting a system and detecting the temperature of a third coolant. SOLUTION: The controller comprises a control section 41 for operating a cooling tower and a second pump before starting a system, a wet-bulb temperature output section 42, a section 43 for estimating the outer air temperature based on an input from the section 42, a section 44 for setting the number of absorption cold water/hot water generators to be started with reference to a preset table, a section 45 for deciding whether it is required to correct the number of generators to be started or not, a section 46 for designating correction, and a capacity control designating section 47 for designating normal capacity control operation. According to the arrangement, normal control of the number of generators to be started (capacity control) can be performed under a stabilized state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the number of startups of an absorption chiller / heater, and more particularly, to cooling a second refrigerant by latent heat of vaporization of a first refrigerant and removing heat from the second refrigerant. A plurality of absorption chiller / heaters for absorbing the evaporated first refrigerant with an absorbent, separating and condensing the first refrigerant from the absorbent, and cooling the second refrigerant again by the latent heat of evaporation of the first refrigerant are provided. And controlling the number of activated absorption water heaters at the time of starting the system configured to circulate the third refrigerant for cooling the first refrigerant and the absorbent of each absorption water heater / water heater through a common cooling tower. And a device therefor.

[0002]

2. Description of the Related Art Conventionally, a second refrigerant (for example, cold and hot water) is cooled by the latent heat of vaporization of a first refrigerant (for example, water), and the first refrigerant that has evaporated by removing heat from the second refrigerant is absorbed by an absorbent. It has a plurality of absorption chiller / heater for absorbing, separating and condensing the first refrigerant from the absorbent, and again cooling the second refrigerant by the latent heat of vaporization of the first refrigerant. First
Third refrigerant for cooling the refrigerant and the absorbent (for example, cooling water)
Has been proposed to circulate through a common cooling tower.

[0003] When starting this system,
A method of fixing the number of absorption chillers to be started to a preset number, and the provision of an outside air temperature sensor, and the number of absorption chillers to start based on the outside air temperature detected by the outside air temperature sensor Has been proposed.
Here, if a method of fixing the number of absorption chillers / heaters to be started to a preset number is adopted, the following inconvenience occurs.

When the number of activated units is fixed to one, it takes a long time to lower the temperature of the second refrigerant to a predetermined temperature range when the outside air temperature is high as in summer. Conversely, if the number of startup units is fixed to a plurality of units, for example, all are not only excessively cold when the outside temperature is not so high as in the spring and autumn seasons, but also wasteful energy is increased. When started, freezing occurs. If freezing occurs, the operation of the absorption chiller / heater cannot be continued.

When a method of setting the number of absorption chillers to be started based on the outside air temperature detected by the outside air temperature sensor is adopted, the absorption chiller / heater according to the season (outside air temperature, that is, load) is used. Since the number of water machines to be started can be set, it is possible to prevent inconvenience such as when adopting a method of fixing the number of absorption-type water heaters to be started to a preset number.

[0006]

However, when adopting a method of setting the number of absorption-type water heaters to be started based on the outside air temperature detected by the outside air temperature sensor, the outside air temperature sensor is installed. It is essential. The outside air temperature sensor cools the second refrigerant by the latent heat of vaporization of the first refrigerant, absorbs heat from the second refrigerant, absorbs the evaporated first refrigerant with an absorbent, and heats the absorbent with a heating source. A plurality of absorption chiller-heaters for separating and condensing the first refrigerant from the absorbent and again cooling the second refrigerant by the latent heat of vaporization of the first refrigerant. Rather than being pre-installed in a system configured to circulate refrigerant through a cooling tower, it is installed on site. Therefore, not only the installation work of the outside air temperature sensor becomes complicated, but also there is a possibility that a wiring error occurs when the outside air temperature sensor is electrically connected to the system. Then, when a wiring error occurs, it becomes impossible to appropriately control the number of absorption-type hot / cold water heaters to be started. Also,
Due to the necessity of the outside air temperature sensor and the complicated installation work, there is an inconvenience of increasing the cost as a whole.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been made in consideration of an absorption type chiller / heater to be started based on an outside air temperature detected by an outside air temperature sensor without using an outside air temperature sensor. Similar to the method of setting the number of units, it is an object of the present invention to provide a method and a device for controlling the number of units of an absorption type chiller / heater capable of setting the number of absorption chiller / water units to be started based on the outside air temperature. And

[0008]

According to a first aspect of the present invention, there is provided a method for controlling the number of startups of an absorption type chiller / heater, comprising a plurality of absorption type chiller / heater, and each of the absorption type chiller / heater being sent to the outside. (2) In a system configured to circulate a first refrigerant for cooling the refrigerant and a third refrigerant for cooling the absorbent through a cooling tower, the cooling tower is operated for a predetermined time before the system is started, and
This is a method of detecting the temperature of the refrigerant and setting the number of activated cooling water heaters based on the detected temperature.

According to a second aspect of the present invention, there is provided a method for controlling the number of startups of an absorption type chiller / heater, wherein a wet bulb temperature is obtained from the detected temperature of the third refrigerant.
In this method, the outside air temperature is estimated based on the obtained wet-bulb temperature, and the number of startups of the absorption-type chiller / heater is set based on the estimated outside air temperature. The method for controlling the number of activated absorption water heaters according to claim 3 is characterized in that after the set number of absorption water heaters is activated, the temperature deviation and the temperature gradient of the outlet aggregate of the second refrigerant cooled by the first refrigerant. In response to the determination that the number of activated units is inappropriate from at least one of the above, in response to the determination that the number of activated units is inappropriate, the temperature deviation of the outlet assembly, the activation of the absorption chiller / heater based on at least one of the temperature gradients This is a method of performing the number correction.

According to a fourth aspect of the present invention, there is provided an apparatus for controlling the number of startups of an absorption chiller / heater having a plurality of absorption chiller / heaters, each of which cools a second refrigerant sent to the outside of the absorption chiller / heater. In a system configured to circulate a third refrigerant for cooling a refrigerant and an absorbent through a cooling tower, a cooling tower operating means for operating the cooling tower for a predetermined time before starting the system, and A third method for detecting the temperature of the third refrigerant after the operation
It includes a refrigerant temperature detecting means and a starting number setting means for setting the starting number of the absorption chiller / heater based on the detected temperature of the third refrigerant.

According to a fifth aspect of the present invention, the number-of-startups control device for the absorption-type chiller / heater determines the wet-bulb temperature from the detected temperature of the third refrigerant as the number-of-startups setting means, and uses the obtained wet-bulb temperature to determine the outside air temperature. It adopts an apparatus that estimates the temperature and sets the number of startups of the absorption type chiller / heater based on the estimated outside air temperature. The number-of-starts-of-absorption-type water heater control device of claim 6 is:
Starting number suitability judging means for judging the suitability of the number of starting units based on at least one of the temperature deviation and the temperature gradient of the outlet gathering portion of the second refrigerant cooled by the first refrigerant after the set number of absorption chiller / heaters are started. In response to the determination by the starting number appropriateness determination means that the starting number is inappropriate, the starting number correction of the absorption chiller / heater is performed based on at least one of the temperature deviation and the temperature gradient of the outlet collecting part. Correction means.

[0012]

According to the first aspect of the present invention, there is provided a method for controlling the number of startups of the absorption chiller / heater, wherein a plurality of absorption chiller / heater are provided, and each of the absorption chiller / heaters cools the second refrigerant sent out. In the system configured to circulate the first refrigerant and the third refrigerant for cooling the absorbent through the cooling tower, the cooling tower is operated for a predetermined time before the system is started, and the temperature of the third refrigerant is detected. Since the number of activated absorption water heaters and water heaters is set based on the detected temperature, the cooling tower is operated for a predetermined time before the system is started, even though the outside air temperature sensor is not specially provided. By detecting the temperature of the third refrigerant at that time, it is possible to indirectly detect the outside air temperature, and accordingly, it is possible to set an appropriate number of startups of the absorption type chiller / heater.

According to a second aspect of the present invention, a method for controlling the number of startups of the absorption type chiller / heater is to obtain a wet bulb temperature from the detected temperature of the third refrigerant and to estimate an outside air temperature based on the obtained wet bulb temperature. ,
Since the number of startups of the absorption type chiller / heater is set based on the estimated outside air temperature, the processing is somewhat complicated due to the necessity of obtaining the wet bulb temperature. Can be achieved.

According to a third aspect of the present invention, after the set number of absorption chiller / hot water heaters are started, the outlet collection portion of the second refrigerant cooled by the first refrigerant is started. Determine the suitability of the number of activated units based on at least one of the temperature deviation and the temperature gradient, and respond to the determination that the number of activated units is inappropriate, based on at least one of the temperature deviation of the outlet assembly and the temperature gradient. Since the number of chilled water heaters started is corrected, the number of chilled water heaters to be started must be corrected if accurate outside air temperature estimation is not possible or if there is a risk of freezing due to no-load starting. In addition, sufficient startup characteristics can be ensured without wasting energy, and the system can be shifted to normal control in a stable state.

According to a fourth aspect of the present invention, there is provided an apparatus for controlling the number of startups of an absorption type chiller / heater, comprising a plurality of absorption type chiller / heater and cooling the second refrigerant to be sent out of each absorption type chiller / heater. First
In a system configured to circulate a third refrigerant for cooling the refrigerant and the absorbent through the cooling tower, cooling tower operating means for operating the cooling tower for a predetermined time before starting the system,
Third refrigerant temperature detecting means for detecting the temperature of the third refrigerant after the cooling tower has been operated for a predetermined time, and the number of activated units for setting the number of activated absorption water heaters and water heaters based on the detected temperature of the third refrigerant Since the setting means is included, the cooling tower is operated for a predetermined time before the system is started, and the temperature of the third refrigerant at that time is detected, even though the outside air temperature sensor is not specially provided, It is possible to indirectly detect the outside air temperature, and accordingly, it is possible to set an appropriate number of startups of the absorption chiller / heater.

In the apparatus for controlling the number of activated chiller / heater units according to claim 5, the detected number of chilled water heaters is determined by the detected third unit.
Since the wet-bulb temperature is calculated from the refrigerant temperature, the outside air temperature is estimated based on the obtained wet-bulb temperature, and the number of absorption chiller / heater units to be started is set based on the estimated outside air temperature. Therefore, although the processing is somewhat complicated due to the necessity of obtaining the wet bulb temperature, the same operation as in claim 4 can be achieved.

According to the sixth aspect of the present invention, after the set number of absorption chiller / hot water heaters are started, after the set number of absorption chiller / hot water heaters are started, the outlet collection portion of the second refrigerant cooled by the first refrigerant is controlled. A temperature deviation of the outlet assembly in response to a determination by the activation number appropriateness determination means for determining the appropriateness of the number of activation numbers based on at least one of the temperature deviation and the temperature gradient; And correction means for correcting the number of startups of the absorption chiller / heater based on at least one of the temperature gradients. Therefore, if an accurate outside air temperature cannot be estimated, freezing may occur due to no-load startup. When there is a possibility, the number of startups of the absorption chiller / heater can be corrected, sufficient start-up characteristics can be secured without wasting energy, and the system can be shifted to normal control in a stable state.

[0018]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a schematic diagram showing the configuration of a system having three absorption chillers / heaters. In this system, three absorption chiller / heaters 1 are provided in parallel between an inlet / outlet collector 31 and an outlet collector 32 of chilled / hot water. A cooling tower 33 for cooling three refrigerants (for example, cooling water) and supplying the cooling water to the three absorption-type hot / cold water heaters 1 again is provided. Further, a controller 4 that supplies a start instruction signal, an operation control signal, and the like to each of the three absorption chiller / heaters 1 is provided. Further, a temperature sensor (third refrigerant temperature sensor) 37 for detecting the temperature of the cooling water inlet is provided at the cooling water inlet of each absorption-type water heater / cooler 1 in advance. Furthermore, a temperature sensor (second refrigerant temperature sensor) for detecting the temperature of the second refrigerant is provided at the outlet collecting part 32.
36 are provided. However, instead of a system having three absorption chillers, a system having two absorption chillers and four or more absorption chillers can be employed.

The first pump 3 is located at a predetermined position in a pipe for supplying cold and hot water from the inlet collecting section 31 to each of the absorption-type hot and cold water heaters 1.
4, and a second pump 35 is provided at a predetermined position in a pipeline for supplying cold and hot water from the cooling tower 33 to each of the absorption-type cold and hot water machines 1. Further, the second refrigerant (for example, cold and hot water) sent out from the outlet gathering section 32 is guided to a use space such as a room through a conduit (not shown), and then guided to the inlet gathering section 31.

FIG. 2 is a block diagram schematically showing the configuration of the absorption type chiller / heater 1. The absorption chiller / heater 1 surrounds a part of a chilled water pipe 11 through which chilled and heated water passes, and evaporates water (first refrigerant) in a state where the inside is set to a high vacuum. 11 through the evaporator heat exchanger 12 '
An evaporator 12 for cooling cold and hot water (second refrigerant) flowing through the evaporator 12,
Absorber 14 that absorbs water vapor (first evaporated refrigerant) with an aqueous solution of lithium bromide (absorbent) cooled by cooling water flowing through absorber heat exchanger 14 ′ through cooling water pipe 13.
And an aqueous solution of lithium bromide that has absorbed water vapor
And a high temperature regenerator 17 for separating water vapor from the aqueous solution of lithium bromide by being heated by the burner 16, and an aqueous solution of lithium bromide from which the water vapor is separated in the high temperature regenerator 17 is supplied. By passing the separated water vapor, the water vapor is further separated from the aqueous lithium bromide solution, and separated in the low-temperature regenerator 18 and the high-temperature regenerator 17 for supplying the separated aqueous lithium bromide solution to the absorber 14. The steam 1 is supplied with the steam and the steam separated in the low-temperature regenerator 18, and is cooled by cooling water passing through a cooling water pipe 13 to condense the steam and supply it to the evaporator 12.
9 and supplied to the high-temperature regenerator 17 by the pump 15.
Lithium bromide aqueous solution absorbing water vapor and low-temperature regenerator 18
And a low-temperature heat exchanger 20 for performing heat exchange between the aqueous solution of lithium bromide and the aqueous solution of lithium bromide supplied to the absorber 14, and the aqueous solution of lithium bromide having absorbed water vapor and supplied from the high-temperature regenerator 17 to the low-temperature regenerator 18. A high-temperature heat exchanger 21 for exchanging heat with an aqueous solution of lithium bromide, and a heat transfer tube (cold water tube) 11
Temperature sensor 22 for detecting the temperature of the cold and hot water passing through, a multi-position control valve 23 for controlling the amount of heating by the burner 16, and a control signal for controlling the multi-position control valve 23 by using the temperature detected by the temperature sensor 22 as an input. Is output and the driver 25
24 that supplies the multi-position control valve 23 via the
And Reference numeral 26 denotes a pump for circulating water accumulated at the bottom of the evaporator 12 and spraying the water on the heat transfer tube 11 again.

As the multi-position control valve 23, for example,
A three position control valve is employed. However, as the multi-position control valve 23, for example, a two-position control valve, a four-position control valve, or the like can be adopted. Instead of the burner 16, a heating source utilizing waste heat such as steam can be employed.

Furthermore, the low-temperature regenerator 18 can be omitted, and various types of absorption type chiller / heater can be employed. The operation of the absorption chiller / heater having the above configuration is conventionally known, and the description of the operation will be omitted. FIG. 3 is a block diagram schematically showing a configuration of the controller 4.

The controller 4 includes a pre-operation control unit 41 for operating the cooling tower 33 and the second pump 35 before starting the system, and a third refrigerant temperature provided at a cooling water inlet of the absorption type chiller / heater 1. A wet-bulb temperature output unit 42 that outputs a wet-bulb temperature by using the temperature detected from the sensor 37 as an input, and an outdoor-air temperature estimating unit 43 that estimates the outdoor temperature by using the wet-bulb temperature as an input.
With the estimated outside air temperature as an input, for example, by referring to a preset table, the number of absorption chiller / heater 1 to be started is set, and the set number of absorption chiller / heater 1 is set. The number-of-starters setting unit 44 that outputs a start instruction signal for instructing to start, and the temperature of the second refrigerant in the outlet collecting unit 32 detected by the second refrigerant temperature sensor 36 after the start of the absorption chiller / heater 1 And a determination unit 45 that determines whether or not the number of the absorption chiller / heater 1 to be started needs to be corrected, and responds to the determination that the number of the absorption chiller / heater 1 needs to be corrected. , And calculates at least one of a temperature deviation and a temperature gradient, and instructs that the number of the absorption-type water heaters / water heaters 1 to be started be corrected, and a determination as to whether or not the number of the corrected number needs to be corrected. What to correct later or for the number After instruction, and a capacity control instruction unit 47 to perform the normal capacity control operation. However, instead of providing the wet-bulb temperature output unit 42 and the outside air temperature estimating unit 43, the outside air that estimates the outside air temperature by using the temperature detected from the temperature sensor provided at the cooling water inlet of the absorption chiller / heater 1 as an input. A temperature estimator may be provided. Further, the temperature sensor provided at the cooling water inlet of each absorption chiller / heater 1 detects the temperature of the cooling water inlet, and aims to prevent the following inconvenience even in a conventional system of the same type. It does not need to be specially provided for this system. That is, if the cooling water inlet temperature is low, the solution concentration becomes low, the amount of refrigerant decreases, and if the amount of refrigerant is insufficient, the evaporation temperature of the evaporator decreases, so that the third refrigerant freezes and the absorption chiller / heater 1 cannot operate. Conversely, when the cooling water inlet temperature is high (for example, 38 ° C. or higher), the temperature and pressure inside the high-temperature regenerator 17 increase,
The protection device (not shown) is activated, and the absorption chiller / heater 1 cannot be operated. Therefore, the cooling water inlet temperature is detected by the temperature sensor, and when this temperature is out of the rated temperature range, a continuous operation can be realized by limiting the heating amount according to the cooling water inlet temperature.

The wet bulb temperature output section 42 and the outside air temperature estimation section 43
The effect of the above will be further described. Since it is known that the temperature of the cooling water is substantially equal to the temperature of the wet bulb, it is possible to obtain the temperature of the wet bulb from the temperature of the cooling water. It is known that if the humidity is assumed to be a predetermined humidity, the dry-bulb temperature (outside air temperature) can be estimated from the wet-bulb temperature. Therefore, the outside air temperature can be estimated from the wet-bulb temperature. Further, when the actual humidity is different from the assumed humidity, accurate estimation of the outside air temperature cannot be performed. However, when the actual humidity is high, it is common to perform the dehumidifying operation and the cooling operation even when the outside temperature is low, and conversely, when the actual humidity is low,
Even when the outside air temperature is high, it is general that the dehumidifying operation and the cooling operation are not performed. Therefore, even if the assumed humidity is not accurate, there is no particular inconvenience.

FIG. 4 is a flowchart for explaining the operation of the above system. In step SP1, the pre-operation control unit 41 causes the cooling tower 33 and the second pump 35
, And in step SP2, wait until a first predetermined time (for example, 5 minutes) elapses, and then in step SP3
In step SP4, the wet-bulb temperature output unit 42 and the outside-air temperature estimating unit 43 estimate the outside-air temperature from the temperature of the third refrigerant, and in step SP4, use the preset number-of-startup-outside-air temperature characteristic to set the number of startup units. By setting the number of units to be started from the estimated outside air temperature by the unit 44 and outputting a start instruction signal, the set number of the absorption type chiller / heater 1 is set.
Start

Thereafter, in step SP5, it is determined whether or not a second predetermined time (for example, 30 minutes) has elapsed after the start-up. If the second predetermined time has not elapsed, it is determined in step SP6. It is determined whether the temperature of the second refrigerant is equal to or lower than a predetermined temperature (for example, 12 ° C.). When it is determined that the temperature of the second refrigerant is not lower than the predetermined temperature, the determination of step SP5 is performed again.

If it is determined in step SP5 that the second predetermined time has elapsed, or if it is determined in step SP6 that the temperature of the second refrigerant is equal to or lower than the predetermined temperature, in step SP7, the second refrigerant is detected. At least one of a temperature deviation and a temperature gradient is calculated from the temperature of the second refrigerant in the outlet collecting part 32 detected by the temperature sensor 36, and in step SP8, at least one of the preset corrected number, the temperature deviation, and the temperature gradient Using the characteristic representing the relationship with the above, the number correction unit 46 calculates at least one of the temperature deviation and the temperature gradient by using the temperature of the second refrigerant as an input, and corrects the number of the absorption chiller / heater 1 to be started. In step SP9, the process waits until a third predetermined time (for example, 15 minutes) elapses from the instruction to correct the number. In step SP10, it carries out a conventionally known as capacity control.

The reason why the first predetermined time is set to, for example, 5 minutes is as follows. That is, in order to measure the wet bulb temperature, the cooling water is exposed to the outside air in the cooling tower,
This is because it is necessary to continue the operation until the cooling water temperature adjusts to the wet bulb temperature of the outside air, and the operation continuation time is about 5 minutes. However, since this time varies depending on the capacity (size) of the cooling tower and the amount of cooling water (length and thickness of the pipe), it is preferable to prepare as a variable parameter. In determining the number of corrections, the following formula is used: Δ (temperature deviation [° C.] − 5) / 20
+ (Temperature gradient [° C./min]+0.5)｝×100 is calculated to calculate the F [%] value, and the corrected number shown in FIG.
It is preferable to determine the number of corrected vehicles by applying the calculated F value to the F value characteristic.

The reason why the second predetermined time is set to 30 minutes is as follows. Absorption type chiller / heater has a slow response. It takes about 20 minutes from start of operation to output of rated capacity at startup. Since the number of units is corrected, by allowing some margin,
It is set to 30 minutes.

The predetermined temperature is set at 12 ° C. for the following reason. Absorption type water heaters are often started with no load at startup (only the absorption type is started first), and when the number of operating units is large (excessive capacity), there is a risk that the cold and hot water becomes too cold and freezes. When such a phenomenon occurs, it is necessary to reduce the number of operating chillers quickly because of the slow response of the absorption chiller / heater. Conversely, if the temperature to be determined is high, there is no point in performing correction. Therefore, in consideration of these, the predetermined temperature is set to 12 ° C.

The reason why the third predetermined time is set to 15 minutes is as follows. In the normal number control (capacity control), it is determined that the load is large when the temperature of the cold / hot water in the outlet collecting unit 32 is high. However, if the normal number control is performed immediately after the number correction, the number increases or decreases regardless of the correction. there is a possibility.
Therefore, as the time when the refrigeration capacity after correction stabilizes,
The third predetermined time is set to 15 minutes.

However, for the predetermined time and the predetermined temperature, other values can be adopted as long as the above conditions are satisfied. FIG. 6 is a schematic diagram illustrating a startup control operation during the cooling operation. In FIG. 6, the horizontal axis represents time, and the vertical axis represents the temperature of the cold / hot water in the outlet assembly 32.

In FIG. 6, during the period until the burner 16 is turned on, only the cooling tower 33 and the second pump 35 are operated to measure the wet bulb temperature from the temperature of the cooling water, and to change the outside air temperature from the wet bulb temperature. Because it is estimated, the exit collecting unit 32
The temperature of the cold and hot water at does not change. Then, the number of startups of the absorption chiller / heater 1 is set from the estimated outside air temperature, and the burner 16 of the absorption chiller / heater 1 for the number of startups is turned on to start the absorption chiller / heater 1. The cooled chilled / hot water is output from the corresponding absorption chilled / hot water machine 1 and the outlet collecting section 3
2, the temperature of the cold and hot water can be lowered.

Next, at the time when the rated capacity is output from the absorption chiller / heater 1 (see area A),
The outlet collecting section 32 measures the temperature of the cold and hot water, calculates a temperature deviation and a temperature gradient based on the temperature measured at predetermined time intervals, and calculates the number of corrected vehicles from these. Then, after the refrigeration capacity after the number correction is stabilized, normal number control (capacity control) can be performed to control the temperature of the cold / hot water in the outlet collecting section 32 to the target temperature.

As a result, without increasing the cost,
Moreover, there is no need to provide an outside air temperature sensor, and the system can be started up by an appropriate number of absorption type chiller / heater 1,
Sufficient rising characteristics can be ensured without waste. Further, by further performing the number correction, it is possible to shift to normal number control (capacity control) in a stable state.

[0036]

According to the first aspect of the present invention, the cooling tower is operated for a predetermined time before the system is started, and the temperature of the third refrigerant is detected at that point in time, although the outside air temperature sensor is not specially provided. This has the specific effect of being able to indirectly detect the outside air temperature and, consequently, setting an appropriate number of startups of the absorption type chiller / heater.

According to the second aspect of the present invention, the processing is somewhat complicated due to the necessity of obtaining the wet bulb temperature.
It has the same effect as. The invention according to claim 3 provides an absorption type chiller / heater in addition to the effects of claim 1 or claim 2, when an accurate outside air temperature cannot be estimated, or when there is a risk of freezing due to no-load starting. The start-up number is corrected, sufficient start-up characteristics are secured without wasting energy, and the system can be shifted to normal control in a stable state.

According to a fourth aspect of the present invention, the cooling tower is operated for a predetermined time before the system is started, and the temperature of the third refrigerant at that time is detected, even though the outside air temperature sensor is not specially provided. In addition, it is possible to indirectly detect the outside air temperature, and thus to achieve a unique effect that the appropriate number of startups of the absorption type chiller / heater can be set. The fifth aspect of the invention has the same effect as that of the fourth aspect, though the processing is somewhat complicated due to the necessity of obtaining the wet bulb temperature.

The invention according to claim 6 has the effect of claim 4 or claim 5. In addition to the effects of claim 4, when the outside air temperature cannot be accurately estimated, or when there is a danger of freezing due to no-load starting, the absorption type This has the unique effect of correcting the number of water heaters to be activated, ensuring sufficient startup characteristics without wasting energy, and allowing the system to transition to normal control in a stable state.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing the configuration of a system having three absorption chillers / heaters.

FIG. 2 is a block diagram schematically showing a configuration of an absorption-type water heater.

FIG. 3 is a block diagram schematically showing a configuration of a controller.

FIG. 4 is a flowchart illustrating the operation of the system of FIG. 1;

FIG. 5 is a diagram illustrating an example of a corrected number-F-value characteristic.

FIG. 6 is a schematic diagram illustrating a startup control operation during a cooling operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Absorption type chiller / heater 32 Outlet assembly part 33 Cooling tower 37 First refrigerant temperature sensor 41 Pre-operation control part 42 Wet bulb temperature output part 43 Outside air temperature estimating part 44 Start-up number setting part 45 Judgment part 46 Number correction part

Claims (6)

[Claims] 1. An absorption type chiller / heater (1) having a plurality of absorption chiller / heater (1), wherein each absorption type chiller / heater (1) cools a first refrigerant for cooling a second refrigerant to be sent out and an absorbent. In the system configured to circulate the third refrigerant through the cooling tower (33), the cooling tower (33) is operated for a predetermined time before the system is started, and the temperature of the third refrigerant is detected. A method for controlling the number of activated chiller / hot water heaters, wherein the number of activated chiller / hot water heaters (1) is set based on the temperature. 2. A wet bulb temperature is obtained from the detected temperature of the third refrigerant, and an outside air temperature is estimated based on the obtained wet bulb temperature.
2. The method according to claim 1, wherein the number of startups of the absorption chiller / heater is set based on the estimated outside air temperature. 3. A temperature deviation and a temperature gradient of an outlet gathering portion (32) of a second refrigerant which is cooled by a first refrigerant and sent to the outside after a set number of absorption chiller / heaters (1) are started. Is determined from at least one of the numbers, the number of activated units is determined to be appropriate, and in response to the determination that the number of activated units is inappropriate, the exit collecting unit (3
The method according to claim 1 or 2, wherein the number of activated cooling water heaters (1) is corrected based on at least one of the temperature deviation and the temperature gradient of (2). 4. A plurality of absorption chiller / hot water heaters (1), wherein each absorption chiller / heater (1) cools a first refrigerant for cooling a second refrigerant sent out and an absorbent. A cooling tower operating means (41) for operating the cooling tower (33) for a predetermined time before starting the system, wherein the cooling tower is configured to circulate the third refrigerant through a common cooling tower (33). A third refrigerant temperature detecting means (37) for detecting the temperature of the third refrigerant after the operation of (33) for a predetermined time;
A start-up number control device for an absorption type chiller / heater, comprising: start-up number setting means (42), (43), (44) for setting the start-up number of the absorption type chiller / heater based on the temperature of the refrigerant. 5. The starting number setting means (42) (43) (4)
4) calculating the wet bulb temperature from the detected temperature of the third refrigerant,
5. The absorption-type cooling and heating apparatus according to claim 4, wherein an outside-air temperature is estimated based on the obtained wet-bulb temperature, and the number of startups of the absorption-type cooling and heating water heater (1) is set based on the estimated outside-air temperature. The control unit for starting the number of water machines. 6. A temperature deviation and a temperature gradient of an outlet collecting portion (32) of a second refrigerant which is cooled by a first refrigerant and sent outside after a set number of absorption type chiller / heaters (1) are started. In response to the determination by the starting number appropriateness determining means (45) for determining the appropriateness of the starting number from at least one of the starting number and the starting number appropriateness determining means (45) that the starting number is inappropriate, the exit collecting unit (32) 6. An absorption cooling and heating apparatus according to claim 4, further comprising a correction means (46) for correcting the number of activated cooling and heating water heaters (1) based on at least one of the temperature deviation and the temperature gradient. The control unit for starting the number of water machines.