JP2001091019A - Regenerative air conditioner and transmitting medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform an efficient heat accumulation operation by accurately grasping residual amount of accumulated heat and accumulating heat just by a required amount. SOLUTION: A regenerative air conditioner is comprised of a heat storage type heat exchanger 8, in which the sum of average radius of latent heat storage medium 5 formed around a first heat transfer pipe when maximum heat accumulation is carried out and average radius of the latent heat storage medium 5 formed around a second heat transfer pipe adjacent to the first heat transfer pipe is set to be larger than a distance between the first heat transfer pipe and the second heat transfer pipe, and an accumulated heat quantity sensing means 10 for sensing the accumulated heat quantity. Quantity of accumulated heat and consumed quantity of accumulated heat of last several days are stored, quantity of accumulative heat required for a utilization cooling operation mode is calculated, on the basis of the the quantity of accumulated heat and the consumed quantity of accumulated heat, and when quantity of heat accumulated in the heat storage type heat exchanger 8 is smaller than a calculated value of required quantity of accumulated heat, a heat-accumulating operation is carried out and when the required quantity of accumulated heat is reached, the heat accumulating operation is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner, and is particularly suitable for a heat storage type air conditioner for controlling a heat storage operation and a transmission medium.

[0002]

2. Description of the Related Art In a regenerative air conditioner, a thermo-on time zone during which an air-conditioning operation has been performed is stored every day over the past several days, and based on the data, the amount of heat storage required for the thermo-on time zone is grasped and a night-time heat storage operation is performed. Is known to do
For example, it is described in JP-A-6-159767.

[0003]

In the above-mentioned prior art, the amount of nighttime heat storage required for air conditioning using daytime heat storage is predicted based on daytime thermo-on time zone data. However, since the heat storage amount actually consumed by the air conditioning operation in the daytime is not detected, the actual heat storage amount in the heat storage unit cannot be grasped, and the remaining heat storage amount cannot be accurately determined. For this reason, even if the predicted heat storage amount is stored, excess or deficiency actually occurs, and as the day passes, an error is accumulated and the difference from the required heat storage amount becomes large. Therefore, the heat storage operation is performed in a state in which the heat storage capacity is reduced even though the necessary heat storage amount remains.

[0004] In addition, when the weather is suddenly changed, for example, the prediction of the outside air temperature cannot be made only from the past outside air temperature data, so that the heat storage amount for the air conditioning load during the day cannot be accurately predicted. Therefore, when the outside air temperature is low, the ice accumulates, and the heat storage amount is left.

[0005] An object of the present invention is to solve the above-mentioned problem by more accurately grasping the remaining heat storage amount and storing heat as much as necessary to perform an efficient heat storage operation.

[0006]

In order to achieve the above object, the present invention relates to a regenerative air conditioner, which is formed around a first heat transfer tube at the time of maximum heat storage in a heat storage operation mode for storing cold energy. The sum of the average radius of the latent heat storage medium and the average radius of the latent heat storage medium formed around the second heat transfer tube adjacent to the first heat transfer tube is defined as the first heat transfer tube and the second heat transfer tube. A heat storage heat exchanger that is larger than the distance between the heat storage heat exchanger and heat storage amount detecting means for detecting the amount of heat stored in the heat storage heat exchanger. The required amount of heat storage in the cooling operation mode is calculated based on the amount and the amount of stored heat, and if the amount of heat stored in the heat storage heat exchanger is smaller than the calculated required amount of heat storage, the heat storage operation is performed. When the heat storage amount is reached, the heat storage operation is stopped.

Further, according to the present invention, in the above-mentioned apparatus, the expected outside air temperature data is obtained and stored by communication with a database which records the data of the expected outside air temperature, and based on the stored value of the expected outside air temperature. It is desirable to calculate the amount of heat storage required for the next use cooling operation.

Further, the present invention relates to the above,
It is preferable to provide a heat storage heat exchanger in which adjacent heat transfer tubes are connected by a metal plate.

Further, the present invention relates to a heat storage type air conditioner which controls a heat storage operation by communicating with a database storing weather data.

Further, the present invention provides an outdoor unit having a compressor, a four-way valve, an outdoor heat exchanger and an expansion device, an indoor unit having an indoor heat exchanger and an expansion device, and a heat storage unit having a heat storage heat exchanger. The weather data for controlling the heat storage operation is transmitted to the heat storage type air conditioner provided with the above.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described below with reference to the drawings.

[0012] The size of the heat storage unit is almost occupied by a water tank for containing water. The size of the tank depends on how much heat is stored in the water. In other words, it depends on how much ice that can store latent heat in this aquarium can be made. Currently, the heat storage heat exchanger has an ice filling rate (IPF) of about 65%, but it is important to increase the ice filling rate in order to save space for the heat storage unit, make the unit more compact, and reduce costs. ing.

In the case of a high-IPF heat exchanger, there is a limit in preventing the ice from coming into contact with each other, and it is necessary to take measures for bringing the ice into contact with each other and raising the IPF. However, in such a heat storage operation in which ice pieces are brought into contact with each other, as the heat storage amount is increased, the ice making capacity is reduced.

In the heat storage operation, when the ice is made up to the maximum heat storage amount, in a heat storage heat exchanger that stores heat until the latent heat storage media formed around the adjacent heat transfer tubes come into contact with each other, the filling rate of the latent heat storage medium is increased. With the same heat storage amount, the tank for storing the heat storage medium can be made more compact than a heat storage heat exchanger in which the latent heat storage medium is prevented from contacting each other when the heat is stored up to the maximum heat storage amount.

However, as shown in FIG. 2, when the latent heat storage medium comes into contact, the ice making capacity decreases as the heat storage amount increases. In other words, until the latent heat storage media formed around the adjacent heat transfer tubes come into contact with each other, the heat resistance increases as the radius of the latent heat storage medium increases, and the heat flow decreases. Since the contact area with the sensible heat storage medium increases, the heat storage capacity does not decrease, offset by the decrease in the heat flow rate due to the increase in the thermal resistance. However, when latent heat storage media formed around adjacent heat transfer tubes come into contact with each other,
Since the contact area of the latent heat storage medium with the sensible heat storage medium is smaller than in the case where it is not in contact, the heat flow rate is reduced and the heat storage capacity is reduced.

Therefore, in the heat storage heat exchanger, when ice is made from a state where there is no ice as much as possible, the power consumption is small and the heat storage operation time can be shortened.

FIG. 1 is a block diagram showing a system of a regenerative air conditioner, including a compressor 1, a four-way valve 2, and an outdoor heat exchanger 3.
a, an outdoor unit having an expansion device 4a, and a heat storage medium 5
When the maximum heat storage of the water and the container 13 for storing the water, the expansion device 4c, and the heat storage operation for storing the cold energy, the heat transfer tube A6
Of ice 7a, which is a latent heat storage medium having an average radius R1 formed around the periphery, and ice 7b, which is a latent heat storage medium having an average radius R2 formed around the heat transfer tube B6 adjacent to the heat transfer tube A6. The sum is the distance d between the heat transfer tubes A6 and B6.
The heat storage heat exchanger 8, the switchgear 14a,
Heat storage unit provided with 14b, 14c and expansion device 4
b, the indoor unit having the indoor heat exchanger 3b is sequentially connected by piping.

Further, the heat storage unit is provided with a heat storage amount detecting device 10, and this heat storage amount detecting device 10 is, for example, shown in FIG.
And a water pressure sensor 10b installed on the bottom of the water tank. Further, in the outdoor unit, the operation stop date and time of the heat storage operation and the use cooling operation are matched with the heat storage amount data output from the storage device with calendar function 9a and the heat storage amount detection device 10 to the stop date and time of the heat storage operation and the use cooling operation. A storage device 9b for calculating the required heat storage amount in the next heat storage operation based on the heat storage amount and the heat storage consumption amount in the past several days, and calculating the target water temperature and the target water pressure from the required heat storage amount. The calculating device 9c has a storage device 11a for storing a maximum heat storage amount (specification value) as an upper limit value of the heat storage amount, a target water temperature, and a target water pressure, and includes a heat storage operation control device 11 for stopping the heat storage operation and the heat storage operation. . Here, the storage device with calendar function 9a may have the function of the storage device 9b.

Further, a heat storage timer 12 for setting the operation time of the heat storage operation and outputting a signal is provided, and is connected to the heat storage operation control device 11 by a wiring for transmitting a signal.

Next, the operation in such a configuration will be described.

First, a method for calculating the required heat storage amount will be described. First, in the heat storage amount detection device 10, the water temperature sensor 10a
The water pressure sensor 10b detects the water temperature for calculating the sensible heat amount of the water, and the water pressure sensor 10b detects the water surface level which rises and falls due to the volume expansion of ice for calculating the sensible heat amount of the water as the water pressure. Next, the heat storage amount data output from the heat storage amount detecting device 10 is transmitted to and stored in the storage device 9b in accordance with the operation stop date and time stored in the storage device with calendar function 9a. Next, the water temperature data and the water pressure data stored in the storage device 9b are transmitted to the arithmetic device 9c, and the heat storage amount is calculated based on the water temperature and the water pressure data based on the conversion function stored in the arithmetic device 9c, The necessary heat storage amount is calculated by the necessary heat storage amount calculation device 9c based on the prediction function stored in the necessary heat storage amount calculation device 9c based on the change in the heat storage amount in the past three days.
At this time, when the value of the required heat storage amount exceeds the maximum heat storage amount, the maximum heat storage amount is set as the required heat storage amount.

Next, the heat storage operation control will be described with reference to the control flow of FIG. First, a determination is made as to whether or not a heat storage operation has been performed for the time set by the heat storage timer 12.

First, the current heat storage amount detection device 10 detects the water temperature and water pressure, and the necessary heat storage amount calculation device 9c calculates the remaining heat storage amount and the required heat amount stored in the current heat storage heat unit, and calculates the required heat storage amount from the required heat storage amount. Calculate target water temperature and target water pressure. Next, the target heat storage amount is stored in the storage device of the heat storage control device 11 by the heat storage operation control device 11, and the target water temperature and the target water pressure are set. Next, the remaining heat storage amount is compared with the required heat storage amount. If the remaining heat storage amount is larger than or equal to the required heat storage amount, the heat storage operation is not performed. If the remaining heat storage amount is smaller than the required heat storage amount, the heat storage operation is started. The high-temperature and high-pressure gas refrigerant discharged from the compressor 1 passes through the four-way valve 2, is condensed in the outdoor heat exchanger 3a, becomes a liquid refrigerant, passes through the outdoor expansion device 4a, and has a low-temperature and low-pressure gas due to the throttling action in the heat storage expansion device 4c. It becomes a liquid mixed refrigerant, exchanges heat with the heat storage medium 5 in the heat storage heat exchanger 8, and is sucked into the compressor 1 through the four-way valve 2. At this time, the opening and closing device 14a of the heat storage unit is open, and 14b and 14c are closed. Thereafter, when the heat storage amount detecting device 10 detects that the target water temperature and the target water pressure are simultaneously satisfied, the operation is stopped.

During use cooling, the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 passes through the four-way valve 2 and passes through the outdoor heat exchanger 3.
The liquid refrigerant is condensed by a and becomes a liquid refrigerant, passes through the outdoor expansion device 4a and the heat storage expansion device 4c, exchanges heat with the heat storage medium stored in the heat storage heat exchanger, and is supercooled, and is throttled by the expansion device 4b of the indoor unit. The refrigerant becomes a low-temperature, low-pressure gas-liquid mixed refrigerant, exchanges heat with the indoor heat exchanger 3b, cools the room, and is sucked into the compressor 1 through the four-way valve 2. At this time, the opening and closing devices 14a and 14b of the heat storage unit are closed and 14c is open.

By performing the heat storage operation only for the necessary amount as described above, especially when the heat storage operation amount is small, the heat storage operation can be performed with the heat storage amount being small as shown in FIG. The ice making operation can be performed with a good heat storage capacity as compared with the case where the heat storage amount is made.

Next, a description will be given of an embodiment in which a function as shown in FIG. 5 is added to the above-described embodiment. A communication function 15 and an expected outside air temperature database 16 are connected to a storage unit of the necessary heat storage amount calculation device 9c via a communication line. As a transmission medium for transmitting the weather data or the expected outside air temperature, a communication medium (optical fiber, wireless line, or the like) in a computer network (LAN, WAN such as the Internet, wireless communication network, etc.) system is preferable.

In addition, a construction management system 17 for collectively managing data such as the room temperature of the building in which the indoor unit is installed and the use schedule of each room is connected to the communication function 15 via a communication line. Is also good.

Next, the operation of the above configuration will be described.

At the time of calculating the required heat storage amount, the storage unit of the required heat storage amount calculating device 9c is connected to a predicted outside air temperature database through a communication line to obtain the predicted outside air temperature data, and stores the data. Based on the expected outside air temperature data, the required heat storage amount is calculated by the necessary heat storage amount calculating device 9c by a prediction function that also considers the expected cooling capacity load of the next day in consideration of the outside air temperature data. Further, the room temperature and the data to be used are obtained from the building management system through the communication line, and the necessary heat storage amount is calculated by the necessary heat storage amount calculating device 9c by the prediction function in consideration of the outside air temperature data and the room temperature and the planned use data of the room. .

As the expected outside air temperature data, it is good in terms of accuracy that the Japan Meteorological Agency uses data obtained by calculating the weather information of the artificial satellite and the temperature, humidity, pressure and the like by a computer.

By calculating the required heat storage amount in consideration of not only the heat storage amount of the heat storage unit but also the expected outside air temperature data of the time of performing the use cooling operation, the use schedule of the room, and the room temperature data, the required heat storage amount with higher accuracy is obtained. Can be calculated.

As shown in FIG. 6, the heat exchanger preferably has a shape in which the heat transfer tubes 6 are connected by a sheet metal, from the viewpoint of efficiency. Further, although the data of the change in the amount of heat stored in the past three days is used for calculating the required amount of heat storage, any number of days may be used. Furthermore, it is also possible to provide a converter for converting the required heat storage amount into the required heat storage time, and to stop the heat storage operation at that time.

It is also possible to connect water to the container 13 for storing the heat storage medium 5, the heat storage medium circulation pump, and the heat exchanger by piping. Further, instead of a water pressure sensor capable of detecting the water level continuously, it is also desirable to provide a plurality of sensors such as a float switch capable of detecting the water level stepwise.

As described above, by performing only the required amount of heat storage operation, especially when the amount of heat storage operation is reduced, the heat storage operation can be performed with a small amount of heat storage as shown in FIG. The ice making operation can be performed in a state where the heat storage capacity is good as compared with the case where the maximum heat storage amount is made.

Further, since the expected outside air temperature data is obtained by the Meteorological Agency calculating the weather information of the artificial satellite and the temperature, humidity, air pressure, etc. by a computer, if it is used, not only the heat storage amount of the heat storage unit but also the cooling operation used The required heat storage amount can be calculated with higher accuracy by calculating the required heat storage amount in consideration of the expected outside air temperature data of the time to perform the process, the room use schedule, and the room temperature data.

[0036]

According to the present invention, the heat storage amount and the heat storage consumption amount are stored, and the necessary heat storage amount in the use cooling operation mode is calculated based on the stored heat amount and the heat storage consumption amount. If it is smaller than the calculated value, the heat storage operation is performed, and if the required heat storage amount is reached, the heat storage operation is stopped. Therefore, the remaining heat storage amount is more accurately grasped, and the necessary amount of heat is stored to perform efficient heat storage operation. be able to.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a system of a regenerative air conditioner according to an embodiment of the present invention.

FIG. 2 is a heat storage capacity curve diagram before and after contact of latent heat storage media formed around a heat transfer tube.

FIG. 3 is a side view showing the heat storage amount detection device according to the embodiment of the present invention.

FIG. 4 is a flowchart of heat storage operation control according to the embodiment of the present invention.

FIG. 5 is a configuration diagram showing a system to which an outside air temperature database and a building management system according to one embodiment of the present invention are added.

FIG. 6 is a side view showing a heat transfer tube according to an embodiment of the present invention.

[Explanation of symbols]

1 ... compressor, 2 ... four-way valve, 3a ... outdoor heat exchanger, 5 ... heat storage medium, 6, A6, B6 ... heat storage heat transfer tube, 7a, 7b latent heat storage medium, 8 ... heat storage heat exchanger, 9b ... storage device , 9c ... required heat storage amount calculation device,
10: heat storage amount detection device, 11a: storage device, 11: heat storage operation control device, 12: heat storage timer, 13: container, 14a, 14b, 14c: switching device, 16: expected outside air temperature database, 17: building management system.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kenji Togusa 390 Muramatsu, Shimizu-shi, Shizuoka Pref. Hitachi Air Conditioning Systems Shimizu Production Headquarters F-term (reference) 3L060 AA03 CC03 CC12 DD02 DD07 EE41 3L061 BA03

Claims (5)

[Claims] 1. An outdoor unit having a compressor, a four-way valve, an outdoor heat exchanger, and an expansion device, an indoor unit having an indoor heat exchanger and an expansion device, a heat storage medium, an expansion device, and a heat storage heat exchanger. A heat storage unit is connected to the heat storage unit via a pipe, and stores heat energy in a heat storage type air conditioner having a heat storage operation mode for storing cold energy and a use cooling operation mode for performing cooling operation using the stored cold energy. In the case of the heat storage operation mode, the average radius of the latent heat storage medium formed around the first heat transfer tube during the maximum heat storage, and the latent heat storage medium formed around the second heat transfer tube adjacent to the first heat transfer tube A heat storage heat exchanger whose sum is larger than the distance between the first heat transfer tube and the second heat transfer tube, and heat storage amount detecting means for detecting the amount of heat stored in the heat storage heat exchanger. Equipped with The heat storage amount and the heat storage consumption amount for several days are stored, the necessary heat storage amount in the use cooling operation mode is calculated based on the heat storage amount and the heat storage consumption amount, and the amount of heat stored in the heat storage heat exchanger is calculated. When the required heat storage amount is smaller than the value, the heat storage operation is performed,
A heat storage type air conditioner characterized by stopping a heat storage operation when a required heat storage amount is reached. 2. The apparatus according to claim 1, wherein the expected outside air temperature data is obtained and stored by communication with a database recording the data of the expected outside air temperature, and the stored value of the expected outside air temperature is determined based on the stored value of the expected outside air temperature. A heat storage type air conditioner characterized by calculating a heat storage amount necessary for the next use cooling operation. 3. The air conditioner according to claim 1, further comprising a heat storage heat exchanger in which the adjacent heat transfer tubes are connected by a metal plate. 4. A heat storage device comprising: an outdoor unit having a compressor, a four-way valve, an outdoor heat exchanger, and an expansion device; an indoor unit having an indoor heat exchanger and an expansion device; and a heat storage unit having a heat storage heat exchanger. A heat storage type air conditioner in which a heat storage operation is controlled by communicating with a database storing weather data. 5. A heat storage device comprising: an outdoor unit having a compressor, a four-way valve, an outdoor heat exchanger, and an expansion device; an indoor unit having an indoor heat exchanger and an expansion device; and a heat storage unit having a heat storage heat exchanger. A transmission medium that transmits weather data for controlling the heat storage operation to the air conditioner.