JPS6346332A - Regenerator of heat pump type - Google Patents

Abstract

PURPOSE:To improve the efficiency of power consumption in regard to thermal cycles, by controlling to operate the thermal cycles, previously preventing the shortage of regenerated amount of heat, by replenishing the forcast shortage of heat under the conditions that the thermal cycles are operated at the time of a season when the outdoor temperature in the further, predicted by an outdoor temperature detector, will be higher than predicted. CONSTITUTION:A controller 28 operates thermal cycles in such a manner that the shortage of regenerated amount of thermal energy is prevented previously by replenishing the forcast shortage of heat, when shortage is forcast in the regenerated amount of heat which is stored in a regenerating tank 14 at present, and which is detected by a regenerated amount detector 29, to the load at a time in the further which is set by a loading pattern setter 30, under the conditions that the thermal cycles are operated in the season when the outdoor temperature in the future predicted by an outdoor temperature predictor 11 will go higher than predicted. With such an arrangement, the thermal cycles are operated, automatically selecting the time when the outdoor temperature is higher than predicted, so that the efficiency of power consumption can be improved.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a heat pump type heat storage device.

[Prior Art] Conventionally, a heat pump type heat storage device as described in Japanese Patent Application Laid-open No. 80-250 has been used in water heaters and the like. This heat pump type heat storage device forms a thermal cycle with one pressure Literometer, a heat exchanger installed in the heat storage tank, an expansion means, and a heat exchanger installed outdoors, and the outdoor heat exchanger transfers the heat medium. At the same time, the heat medium is condensed in a heat exchanger in the heat storage tank, and the heat of condensation of the heat medium is stored in the heat storage tank.

Here, the heat cycle in the conventional heat pump type heat storage device is stopped and restarted based on the heat medium pressure of the heat cycle or the heat storage temperature in the heat storage tank, as described in the above-mentioned Japanese Patent Application Laid-Open No. 80-250. This allows the amount of heat corresponding to the hot water supply load to be stored in the heat storage tank.

[Problems to be Solved by the Invention] By the way, in the above thermal cycle, in a state in which the compressor is driven by consuming power such as electricity, the thermal energy in the compressor and the heat obtained by an outdoor heat exchanger are combined. It releases energy into the heat storage tank, and its operating efficiency η largely depends on the level of the outdoor air temperature t, as shown in FIG. That is, when the outdoor temperature t is below a certain temperature, the operating efficiency η of the thermal cycle is extremely low.

In conventional heat pump type heat storage devices, the power consumption rate of the heat cycle (8-F
In order to improve the IT ratio), no consideration has been given to controlling the operation in response to changes in outdoor temperature and ensuring that hot water capable of handling the load can always be stored in the heat storage tank. .

An object of the present invention is to improve the power consumption rate of a heat cycle and to constantly store an amount of heat that can correspond to the load.

[Means for Solving the Problems] The present invention forms a heat cycle with a compressor, a heat exchanger installed in a sluice tank, an expansion means, and a heat exchanger installed outdoors, and performs outdoor heat exchange. In a heat pump type heat storage device, the heat medium is evaporated in a heat storage tank, the heat medium is condensed in a heat exchanger in a heat storage tank, and heat is stored in the heat storage tank using the condensed heat of the heat medium, and the amount of heat stored in the heat storage tank is detected. a load pattern setting device that presets changes in load over time as a load pattern; an outside temperature predictor that predicts changes in outdoor temperature over time; When it is predicted that the amount of heat storage in the heat storage tank will be insufficient for the load at a certain time in the future set in the load pattern setter, the amount of heat stored in the heat storage tank at and a controller that operates the heat cycle so as to replenish the predicted heat shortage and eliminate the heat storage shortage in advance, on the condition that the heat cycle is operated during a period when the outdoor temperature is higher. This is how it works.

[Function] According to the present invention, pressure! ! ii machine, heat exchanger in the heat storage tank,
A thermal cycle is formed by the expansion means and an outdoor heat exchanger, and the compressor is driven by consuming power such as electricity, and the thermal energy from the compressor and the thermal energy obtained from the outdoor heat exchanger are combined. will be released into the heat storage tank.

Here, in the present invention, the amount of storage in the heat storage tank at the present time detected by the heat storage amount detector is insufficient for the load at a certain future time set in the load pattern setting device. When this is expected, the predicted heat shortage will be supplemented and the heat storage will be deficient, provided that the thermal cycle is operated during the period when the outdoor temperature from the present to the future will be higher than predicted by the outdoor temperature predictor. The operation of the thermal cycle is controlled so as to eliminate the problem in advance.

In other words, the controller operates the heat cycle at a time when the outdoor temperature is higher, when the operating efficiency of the heat cycle is high and the energy cost is low. Therefore, when a shortage of heat storage is expected at a certain time in the future, for example, the outdoor temperature in the future is predicted to be higher than the present, and the expected heat storage shortage can be reduced by only operating the heat cycle in the future. If it is determined that replenishment is possible, the current operation of the thermal cycle is stopped in a standby state, and the thermal cycle is operated in the future when the outdoor temperature is high. As a result, the heat cycle is operated while automatically selecting a higher temperature outside the room where operating efficiency is high and energy cost is low, and the power consumption rate can be improved and the heat cycle can be adapted to the load. ! 8 amounts of heat can be stored at all times.

[Example] Fig. 1 is a schematic diagram showing the cooling and dehumidifying mode of a heat pump type air-conditioning/heating storage device to which the present invention is applied, Fig. 2 is a schematic diagram showing the heating mode of the heat pump type air-conditioning/heating storage device to which the present invention is applied, and Fig. 3 is a schematic diagram showing the heat storage mode of the heat pump type air-conditioning/heating heat storage device, Fig. 4 is a diagram showing the relationship between the load pattern in the present invention, the driving rate of the pressurized Li1 unit, the amount of heat storage, and the predicted outdoor temperature. A block diagram showing a control system of the present invention,
FIG. 6 is a diagram showing the relationship between the outdoor temperature and the operating efficiency of the thermal cycle.

Heat pump type air conditioning heat storage device 1 shown in Figs. 1 to 3
0 is cooler 11, indoor unit 12, outdoor unit 13, heat storage tank 1
It is equipped with 4.

The cooler 11 is a compressor 15. It is equipped with a four-way switching valve 16, an electric expansion valve 16A, and an accumulator 17. The indoor unit 12 includes a heat exchanger 18, a blower 19, and a dehumidifying pan 20.
It is equipped with The outdoor fi 13 includes a heat exchanger 21 and a blower g.
It is equipped with 122. The heat storage tank 14 is a heat exchanger 23.2
4, a pump 25, and a hot water supply device 26. That is, the heat storage device 10 includes a cooling fill compressor 15, an expansion valve 16 . The accumulator 17, the heat exchanger 18 of the indoor unit 12, the heat exchanger 21 of the outdoor unit 13, and the heat exchangers 23 and 24 of the heat storage tank 14 form a similar cycle. 27A to 27F are electromagnetic on-off valves.

The heat storage device 10 includes a controller 28 made of a microcomputer or the like. The controller 28 controls the expansion valve 16 and the on-off valves 27A to 2.
7F is switched and controlled to form a heat medium circulation circuit for each operation mode, and the compressor 151w expansion valve 16 and blower 19.22 are drive-controlled to operate the heat cycle in each operation mode. .

Here, each operation mode of the heat storage device 10 will be explained as follows.

■ Cooling dehumidification mode (Fig. 1) The controller 28 sets the switching valve 16 as shown in Fig. 1, opens the on-off valves 27A, 27C to 27F, and switches on the on-off valve 27B.
By closing, a heat medium circulation circuit for cooling/dehumidifying mode is formed. As a result, the high-pressure high-temperature heat medium from the compressor 15 passes through the heat exchanger 21 of the outdoor unit 13 by the switching valve 16, radiates heat to the outside and condenses, and passes through the heat exchanger 23 of the heat storage tank 14 to the heat storage tank. After dissipating heat and condensing into the water of 14,
Indoor air is cooled by passing through the expansion valve 16A and evaporating in the heat exchanger 18 of the indoor unit 12. In this mode, the indoor air is dehumidified by collecting moisture in the indoor air that liquefies in contact with the surface of the heat exchanger 18 into the dehumidifying pan 20.

■Heating mode (Fig. 2) The controller 28 sets the switching valve 16 as shown in Fig. 2, opens the on-off valves 27A and 270-27F, and closes the on-off valve 27B.
By closing, a heat medium circulation circuit for heating mode is formed. As a result, the high-pressure high-temperature heat medium from the compressor 15 passes through the heat exchanger 18 of the indoor unit 12 by the switching valve 16, radiates heat into the room and condenses, and then passes through the expansion valve 16A to the outdoor 4!
At t13, outside air heat is absorbed and evaporated through the heat exchanger 21, and at the same time, the heat of water in the heat storage tank 14 is absorbed and evaporated through the heat exchanger 23 of the heat storage tank 14, thereby warming the indoor air.

■Heat storage mode (Fig. 3) The controller 28 sets the switching valve 16 as shown in Fig. 3, opens the on-off valves 27B, 27C, and 27E, and closes the on-off valve 27A.
, 27D, and 27F form a heat medium ffi loop circuit in heat storage mode.

As a result, the high-pressure and high-temperature heat medium from compression@15 is transferred to the switching valve 1.
6, the heat storage tank 14 passes through the heat exchanger 24 of the heat storage tank 14.
After radiating heat to the water and condensing it, it passes through the expansion valve 16A and the heat exchanger 21 of the outdoor Jyi 13, absorbs outside air heat, evaporates, and stores the heat in the water in the heat storage tank 14.

Thus, the heat storage device 10 controls the one-turn state of the heat cycle in the heat storage mode as follows.

That is, the heat storage device 10 includes a heat storage amount detector 29, a load pattern setting device 30, an outside temperature predictor 31, and a hot water supply amount detector 3.
It is equipped with 2. The heat storage amount detector 29 detects the amount of heat stored in the water in the heat storage tank 14 . The load pattern setting device 30 is a hot water supply device 26 that consumes the amount of heat stored in the heat storage tank 14.
The fluctuation of the load over time is set in advance as a load pattern. The outside temperature predictor 31 is, for example, an atmospheric pressure detector,
It has a temperature sensor, humidity sensor, and clock, and predicts changes in outdoor temperature over time from changes in these values over a short period of time. The hot water supply amount detector 32 detects the actual consumption amount of the hot water supply device 26 .

Heat storage amount detector 29. The detection result of the hot water supply amount detector 32, the setting result of the load pattern setting device 30, and the prediction result of the outside temperature predictor 31 are transmitted to the controller 28.

Note that the load pattern setter 30 is set with the expected load at each time of the day as shown by L in FIG. Fourth
The horizontal axis H in the figure shows the time, a is the morning cooking and washing load, b
is the daytime cooking load, C is the evening cooking load, d is the bathtub load,
e is the shower load.

f indicates the reheating load of the bathtub, this load pattern setting device 3
The load pattern set to 0 is initially based on a pattern determined by experience, but is corrected by the controller 28 after the initial stage has passed. That is, the controller 28 calculates the expected load at each time set in the load pattern setting device 30 based on the detection result of the hot water supply amount detector 32, that is, the actual consumption amount of the heat storage amount in the heat storage tank 14 at each time. Can be corrected.

Here, the controller 28 determines whether the heat storage f (Q in FIG. 4) of the heat storage tank 14 at the present time detected by the heat storage amount detector 29 is the load (Q in FIG. When it is predicted that there will be a shortage of L in FIG. 4, the outdoor temperature predicted by the outside temperature predictor 31 (t in FIG. 4) is higher On the condition that the heat cycle is operated, the heat cycle is operated so as to replenish the predicted heat shortage and eliminate the heat storage shortage in advance.

In other words, the controller 28 operates the heat cycle at higher outdoor temperatures when the heat cycle operation efficiency is high and the energy cost is low. Therefore, when a shortage of heat storage is expected at some time in the future, for example, when it is predicted that the outdoor temperature in the future will be higher than the present, the predicted shortage of heat can be supplemented only by operating the heat cycle in the future. If it is recognized that this is possible, the current operation of the thermal cycle will be stopped in a standby state, and the thermal cycle will be operated in the future when the outdoor temperature is high. That is, the controller 28
When the outdoor temperature t is high, such as during the day, the thermal cycle of the heat storage device IO is operated at a high drive rate as shown in 1 in Figure 4 in preparation for future loads. When the heat storage amount is insufficient due to operation only at a high temperature t, the heat cycle is operated at a low necessary minimum driving rate as shown in 2 in FIG. 4 to cope with the heat storage insufficient amount. In addition, methods for increasing the driving rate of the -F thermal cycle include: (1) increasing the number of revolutions of the compressor 15 to increase the amount of heat medium circulation and increasing the heat storage capacity, or (2) increasing the heat storage capacity by increasing the rotation speed of the compressor 15. There is a method of increasing the number of rotations of the heat exchanger 22 to increase the amount of heat medium evaporated in the heat exchanger 21, thereby increasing the amount of outside air heat absorbed.

As a result, the thermal cycle is operated while automatically selecting a higher temperature outside the room where operation efficiency is high and energy cost is low, improving the power consumption rate and constantly storing enough heat to cope with the load. Can be done.

[Effects of the Invention] As described above, the present invention forms a heat cycle by a pressure M machine, a heat exchanger installed in a heat storage tank, an expansion means, and a heat exchanger installed outdoors, and In a heat pump type heat storage device that evaporates a heat medium in a heat exchanger, condenses the heat medium in a heat exchanger in a heat storage tank, and stores heat in the heat storage tank using the condensed heat of the heat medium, the amount of heat stored in the heat storage tank A heat storage amount detector that detects the amount of heat stored, a load pattern setter that presets changes in load over time as a load pattern, an outside temperature predictor that predicts changes in outdoor temperature over time, and a heat storage amount detector that detects When it is predicted that the amount of heat stored in the heat storage tank at the present moment will be insufficient for the load at a certain future time set in the load pattern setting device, the current amount predicted by the outside temperature predictor A controller that operates a heat cycle so as to replenish the predicted heat shortage and eliminate the heat storage shortage in advance, on the condition that the heating cycle is operated at a time when the outdoor temperature will be higher in the future. Therefore, it is possible to improve the power consumption rate of the heat cycle and to constantly store a heat amount that can correspond to the load.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the cooling and dehumidifying mode of the heat pump type air conditioning/heating heat storage device to which the present invention is applied, Fig. 2 is a schematic diagram showing the heating mode of the heat pump type air conditioning/heating heat storage device, and Fig. 3 is a schematic diagram showing the heating mode of the heat pump type air conditioning/heating storage device to which the present invention is applied. Heat storage? Fig. 4 is a diagram showing the relationship between the load pattern, compressor drive rate, amount of heat storage, and predicted outdoor temperature in the present invention, and Fig. 5 shows the control system of the present invention. The block diagram shown in FIG. 6 is a diagram showing the relationship between the outdoor air temperature and the operating efficiency of the thermal cycle. 10... Heat storage device, 11... Cooler, 13... Outdoor unit, 14... Heat storage tank, 15... Compressor, 16A.
... Expansion valve, 18... Heat exchanger, 23.24... Heat exchanger, 26... Water heater, 28... Controller, 29
...Heat storage amount detector, 30...Load pattern setting device,
31... Outside temperature predictor, 32... Hot water supply amount detector. Figure 4

Claims (2)

[Claims] (1) A heat cycle is formed by a compressor, a heat exchanger installed in the heat storage tank, an expansion means, and a heat exchanger installed outdoors, and the heat medium is evaporated in the outdoor heat exchanger, and the heat exchanger is In a heat pump type heat storage device that condenses a heat medium in a heat exchanger and stores heat in a heat storage tank using the condensed heat of the heat medium, there is a heat storage amount detector that detects the amount of heat stored in the heat storage tank, and a heat storage amount detector that detects the amount of heat stored in the heat storage tank and a heat storage amount detector that detects the amount of heat stored in the heat storage tank. A load pattern setter that presets fluctuations in the outdoor temperature as a load pattern, an outside temperature predictor that predicts changes in outdoor temperature over time, and a heat storage amount detector that detects the current amount of heat stored in the heat storage tank. When it is predicted that the load will be insufficient for the load at a certain time in the future set in the setting device, the temperature will be increased at a time when the outdoor temperature from the present to the future will be higher than predicted by the outdoor temperature predictor. A heat pump type heat storage device characterized by having a controller that operates a heat cycle so as to replenish the predicted insufficient amount of heat and eliminate the insufficient amount of heat storage in advance, on the condition that the cycle is operated. . (2) The expected load at each time of the day is set in the load pattern setting device, and the controller is configured to set the expected load in the load pattern setting device based on the actual consumption amount of heat in the heat storage tank at each time. The heat pump type heat storage device according to claim 1, which has a function of correcting the expected load at each time.