JP2537784B2 - Operation control method for heat storage air conditioner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an operation control method for a heat storage cooling / heating device, and more particularly to a heat storage cooling / heating device suitable for performing energy saving operation control by incorporating an air conditioning load prediction. The present invention relates to an operation control method.

[Conventional technology]

In recent years, as the demand for electric power has increased, the difference in the power load between day and night or the concentration over time has tended to expand, and the development of a heat storage air conditioning system that is effective as a measure for leveling the demand for power is an important technical issue. Has been.

For example, Hitachi Review VOL.66, No.6 (1984-June) P.17-2
In 0, a technical report titled "Unit-type ice thermal storage cooling and heating system" is published by Masahiro Oguri and others.

Particularly recently, it is difficult to construct a heat storage tank having a sufficient capacity due to space restrictions, so a method of operating a heat storage tank and a heat source device such as a refrigerator together for an air conditioning load, The latent heat storage method is drawing attention.

An efficient operation method of these heat storage cooling / heating devices is to perform a minimum operation commensurate with the load, and for that purpose, it is an important issue to incorporate an accurate load prediction into the operation control.

Conventionally, in order to easily predict the air conditioning load, predictions from actual load measurements and empirical monthly predictions have been tried, but in reality they are not very practical in terms of cost and accuracy. there were.

For example, in the air conditioning predictive control device disclosed in Japanese Patent Laid-Open No. 49-83246, as a result of analyzing the air conditioning load of the building for half a year, the peak value of the air conditioning load of the building and the outside air enthalpy at 6:00 am on that day It is disclosed that there is a linear correlation and the required air conditioning load is predicted from the above enthalpy.

[Problems to be Solved by the Invention]

The technique described in JP-A-49-83246 described above calculates the outside air enthalpy from the outside air temperature and the outside air humidity, and discloses the correlation between the outside air enthalpy and the air conditioning load, but the weekly annual outside air temperature data. No consideration was given to realizing a highly accurate air conditioning load prediction that takes into consideration the maximum daily integrated load of cooling and heating, the daily integrated internally generated load due to internally generated heat, and so on.

The present invention has been made in view of the above-mentioned conventional state of the art, and is a heat storage cooling and heating system that makes it possible to predict the yearly air conditioning load inexpensively and with relatively high accuracy, and to enable efficient operation of heat source equipment and peak shift operation. An object of the present invention is to provide an operation control method for a device.

[Means for solving the problem]

In order to achieve the above object, the configuration of the operation control method of the heat storage cooling and heating device according to the present invention is a heat source device, a heat storage tank connected to the heat source device and the load side device, a means for controlling these, and the outside air temperature. And each detection means for detecting the amount of heat storage, at least in the operation control method of the heat storage cooling and heating device for predicting the required air conditioning load based on the outside air temperature data to control the operation of the heat source device, based on the meteorological data in advance. Using the set annual weekly outdoor air temperature data, and at least the maximum daily integrated load of cooling and heating obtained by load calculation and the daily integrated internally generated load due to internally generated heat, the outdoor air temperature during the cooling period and the The daily integrated load excluding the constant internally generated load is proportionally correlated, and the outside air temperature and the daily integrated load are proportionally correlated during the heating period. The daily integrated load forecast for the year is calculated according to the data, and the daily integrated load forecast is corrected by the difference between the actually detected outside air temperature and the preset annual outdoor air temperature data for the heat source device. The predicted driving is performed.

[Action]

The concept of developing the present invention and the function of the above technical means will be described together.

The main components of the cooling and air conditioning load are internally generated heat, radiant heat, conductive heat, and taken-in outside air heat. Internal heat is generated from internal equipment and human body and is considered to be almost constant throughout each season. Further, the radiant heat, the conductive heat, and the taken-in outside air heat vary depending on the outside air conditions. Therefore, it can be said that the value obtained by removing the internally generated load from the total cooling load correlates with the outside air temperature.

On the other hand, the main elements of the heating and air conditioning load are conduction heat and intake outside air heat, and it can be said that these heating loads are correlated with the outside air temperature.

From this matter, it is possible to estimate the air conditioning load by reading the outside air temperature at a certain time from the data input to the microcomputer or by measuring the outside air temperature with a temperature sensor.

Therefore, the present invention is based on easily available information based on weather data and a simple information processing device such as a microcomputer, and preset annual weekly outdoor air temperature, maximum daily cooling / heating integrated by load calculation. Load and daily accumulated internal generated load.Outdoor air temperature and daily accumulated load excluding internally generated load are proportionally correlated during cooling time, and outdoor air temperature and daily accumulated load are proportionally correlated during heating period. Therefore, the daily integrated load forecast for the year is calculated, and the daily integrated load forecast is corrected by the difference between the actually detected outside air temperature and the weekly annual outside air temperature data, and highly accurate predictive operation of the heat source device is performed. Is what makes it possible.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

First, FIG. 1 shows an example of a heat storage cooling / heating apparatus that performs air conditioning load prediction operation control.

FIG. 1 is a schematic configuration diagram of a heat storage cooling / heating apparatus according to an embodiment of the present invention.

In FIG. 1, 1 is a refrigerator that lowers or raises the temperature of water that is a heat transfer medium, and 2 is a heat storage tank that stores cold water and hot water with cold / hot water obtained from the refrigerator 1,
3 is a primary cold / hot water pump that is arranged in a water pipe connecting the refrigerator 1 and the heat storage tank 2 to circulate water.
4 is a control panel for controlling each of these devices, 5 and 6 are
Various sensors for detecting the amount of heat stored in the heat storage tank 2, 7 is a temperature sensor for detecting the outside air temperature, 8
Is a load side air conditioner, and 9 is a secondary cold / hot water pump which is arranged in a water pipe connecting the air conditioner 8 and the heat storage tank 2 and circulates water.

The operation of the heat storage cooling / heating device having such a configuration will be described below.

During the heat storage operation, the refrigerator 1 and the primary cold / hot water pump 3 are operated, and while the water in the heat storage tank 2 is circulated, the temperature of the water is lowered or the temperature is raised, and heat is stored in the heat storage tank 2.

During the air conditioning operation, the air conditioner 8 and the secondary cold / hot water pump 9 are operated to circulate the water in the heat storage tank 2 while consuming the amount of heat stored in the heat storage tank 2. Here, when the load is large, the amount of heat stored in the heat storage tank 2 in the heat storage operation is insufficient, so the air conditioner 8 and the secondary cold / hot water pump 9 are operated to consume the amount of heat and simultaneously cool the refrigerator. 1 and the primary cold / hot water pump 3 are also operated to replenish the heat storage tank 2 with the amount of heat.

The control procedure of such a heat storage air conditioner will be described.

In the case of the heat storage operation, it is determined whether or not the heat storage amount of the heat storage tank 2 has reached a preset heat storage amount, and until it reaches, the refrigerator 1 and the primary cold / hot water pump 3 are operated and preset. When a certain heat storage amount is reached, the refrigerator 1 and the primary hot water pump 3 are stopped. The operation is continued until the heat storage amount reaches the set value.

In the case of air conditioning operation, air conditioner 8 and secondary cold / hot water pump 9
To drive. At this time, the air-conditioning load is predicted, the amount of insufficient heat is calculated from the comparison between the heat storage amount and the air-conditioning load prediction, and the operating timetable of the refrigerator 1 and the primary cold / hot water pump 3 is calculated from the heat source device capacity, that is, the capacity of the refrigerator 1. The refrigerating machine 1 and the primary cold / hot water pump 3 are operated / stopped in accordance with the attachment.

Next, in the operation control of the heat storage cooling / heating apparatus described above, the configuration of the control apparatus for performing the air conditioning load prediction operation and the control procedure will be described with reference to FIGS. 2 and 3.

FIG. 2 is a block diagram showing the configuration of the air conditioning load prediction control unit in the operation control device of the heat storage cooling / heating device of FIG. 1, and FIG. 3 is for obtaining the correlation between the outside air temperature of the target load and the daily integrated load. It is explanatory drawing which shows a procedure.

In FIG. 2, 5 and 6 are various sensors provided in the heat storage tank 2 to detect the heat storage amount, as shown in FIG. 1, for example, 5 is a temperature sensor, and 6 is a pressure sensor. .

Reference numeral 7 is a temperature sensor for detecting the outside air temperature, 10 is a microcomputer relating to arithmetic control means, and each block shown in the frame of the microcomputer 10 represents the function of the microcomputer 10 in this embodiment. 11 is a power supply unit, 12 is a storage unit, 13 is a calculation unit, and 14 is an output unit.

Reference numeral 15 is a heat source device such as the refrigerator 1 and the primary cold / hot water pump 3 described above with reference to FIG.

In order to predict the air-conditioning load, first, annual preset outdoor temperature data based on the weather data is input, and then the correlation between the outdoor temperature data and the daily integrated load is obtained.

The procedure is as follows. Each symbol in the following description corresponds to the symbol shown in FIG.

In Fig. 3, the horizontal axis shows the month and the vertical axis shows the temperature, showing the annual temperature change in weekly units. The solid line in a staircase pattern is the standard temperature in each weekly unit, and the broken line in the cooling season is the daily maximum. The weekly average temperature, the broken line in the heating season is the weekly average of the daily minimum temperature.

1) Change the annual temperature change at a standard time of 10 hours in week units
Input in 52 divisions and use this as the standard temperature Tn.

2) Let Th be the temperature at 10 o'clock of the maximum temperature used for the cooling load calculation, and the maximum cooling load at this time is Qcmax.
And

3) Let Tl be the temperature at the reference time of 10 o'clock of the lowest temperature used for heating load calculation, and the maximum heating load at this time is Qwmax
And

4) Let Tc be the temperature at the reference time on the day when the daily maximum temperature is the cooling start temperature (about 28 ° C), and the cooling load at this time is the internally generated load Qci.

Therefore, the cooling load when the temperature is equal to or higher than Tc on the day of the cooling start temperature is increased in proportion to the outside air temperature with the internally generated load Qci as the minimum load. In other words, during cooling, the outside air temperature and the daily integrated load excluding the internally generated load are proportionally correlated.

5) Let Tw be the temperature at the reference time of the day when the daily minimum temperature is the heating start temperature (about 18 ° C), and the heating load at this time is the internally generated load 0.

Therefore, the heating load when the temperature is equal to or lower than the heating start temperature Tw on the day increases as the outside air temperature decreases. In other words, during heating, the outside air temperature and the daily integrated load are proportionally correlated.

In this way, the correlation between the outside air temperature at the reference time and the daily integrated load is determined, and it is possible to predict the annual load only with this, but in this embodiment, in order to increase the prediction accuracy, the actual outside air condition is further fed back. I am letting you. That is, the outside air temperature is detected by the temperature sensor 7 at the reference time 10 and added to the calculation formula of the air conditioning load prediction.

 The air-conditioning load prediction calculation formula is as follows.

 The standard temperature at the nth week is Tn.

(A) Cooling load The cooling load Qc (n) at the nth week is When the outside air temperature measurement value at the reference time of 10 o'clock is corrected to t, When a correction coefficient is given to each term and summarized, (B) Heating load The heating load Qw (n) for the nth week is When the outside air temperature measurement value at the reference time of 10 o'clock is corrected to t, When a correction coefficient is given to each term and summarized The correction coefficients k ₁ , k ₂ , k ₃ , k ₄ used in the calculation are input in advance in the storage unit 12 of the microcomputer 10.

The prediction of the air conditioning load is performed as described above, further, from the data of the heat source device capacity input to the detection and storage unit 12 of the heat storage amount, the operating time allocation of the heat source device 15 is performed by the operation unit 13, An appropriate air conditioning load prediction operation of the heat source device 15 is performed via the output unit 14.

According to the operation control method of the heat storage air conditioner of the present embodiment,
By using general weather data and a simple program, it is possible to predict the air conditioning load inexpensively and with a relatively high degree of accuracy, and it is possible to perform efficient operation of the heat storage cooling / heating device with less excess and deficiency.

In addition, in the above-described embodiment, an example using a refrigerator as a heat source device has been described, but the present invention is not limited to this, for example, other heat source devices used by being connected to a heat storage tank such as a heat pump chiller unit. It cannot prevent adoption.

〔The invention's effect〕

As described above, according to the present invention, an operation control method for a heat storage cooling / heating device that makes it possible to perform a practical annual air-conditioning load prediction that is inexpensive and highly accurate, and that enables efficient operation of heat source equipment and peak shift operation. Can be provided.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a heat storage cooling / heating apparatus according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a configuration of an air conditioning load preliminary control unit in an operation control device of the heat storage cooling / heating apparatus of FIG. FIG. 3 is an explanatory diagram showing a procedure for obtaining the correlation between the outside air temperature of the target load and the daily integrated load. 1 ... Refrigerator, 2 ... Heat storage tank, 3 ... Primary cold / hot water pump, 5 ... Temperature sensor, 6 ... Pressure sensor, 7 ...
Temperature sensor, 8 ... Air conditioner, 9 ... Secondary cold / hot water pump, 10 ... Microcomputer, 12 ... Storage unit, 13
…… Calculator, 14 …… Output, 15 …… Heat source equipment.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Yanagihara 1-3-3 Uchisaiwaicho, Chiyoda-ku, Tokyo TEPCO (72) Inventor Yuji Tsubota 1-3-1 Uchisaiwaicho, Chiyoda-ku, Tokyo TEPCO Incorporated (72) Inventor Ryosuke Onoda 603 Kintate-cho, Tsuchiura-shi In the Tsuchiura Plant, Hitachi Ltd. (72) Inventor Shirou Sugimoto 603 Kintate-cho, Tsuchiura-Inside the Hitachi Tsuchiura Plant (56) ) References JP-A-49-83246 (JP, A)

Claims (1)

(57) [Claims] 1. A heat source device, a heat storage tank connected to the heat source device and the load side device, means for controlling these, and detection means for detecting the outside air temperature and the amount of accumulated heat, and based on at least the outside air temperature data. In the operation control method of the heat storage air conditioner that predicts the required air conditioning load and controls the operation of the heat source equipment, the weekly annual outside air temperature data set beforehand based on the meteorological data, and at least the heating and cooling calculated by the load calculation. The maximum daily accumulated load and the daily accumulated internally generated load due to internally generated heat are used, and during the cooling period, the outside air temperature and the daily accumulated load excluding the internally generated load, which is almost constant during the season, are proportionally correlated. Since the outdoor temperature and the daily integrated load are proportionally correlated during the heating period, the annual daily integrated load forecast is calculated according to the annual outdoor air temperature data, and the actual The operation of the heat storage cooling and heating apparatus characterized by performing the predictive operation of the heat source device so as to correct the daily cumulative load prediction by the difference between the known outdoor air temperature and the preset annual outdoor air temperature data. Control method.