JPH01314864A - Air conditioning device for living house - Google Patents

Abstract

PURPOSE:To eliminate exerting temporary overloading to a system of electric power caused by starting a compressor of a center heat pump unit by selecting compressors in a number which adapts to the sensed temperature of a temperature sensor from the individual compressors of one center heat pump unit and starting successively with a specified time interval each of those compressors which have been selected. CONSTITUTION:A center unit 10' has a plurality of compressors 12a-12e. While the air conditioning operation is carried out, if the absolute value of temperature, DELTAT of the difference between temperature sensed by a temperature sensor 33 and a set temperature is, for instance, 8 deg.C<=DELTAT, the compressors 12a-12e are successively operated with a time interval of 15 seconds, and if 6 deg.C<=DELTAT<8 deg.C, each of the compressors 12b-12e is successively operated with a time interval of 15 seconds. If DELTAT<1 deg.C, each of the compressors 12a-12e is not driven. On the other hand while each of the compressors 12a-12e is driven, if the temperature of the water in a water cycling route 30 changes and if T<1 deg.C, each of the compressors 12a-12e is stopped, and if 1 deg.C<=DELTAT<2 deg.C, each of the compressors 12a-12d is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an air conditioner for a residential building that includes a center heat pump unit and a terminal heat pump unit.

(Prior art) Conventionally, this type of air conditioner for residential buildings is shown in Figures 2(a) and (b).
) are known (Utility Application No. 62-48126)
issue). That is, 10 is a center heat pump unit (hereinafter referred to as a center unit), 20a to 20e are a plurality of terminal heat pump units (hereinafter referred to as terminal units), and 30 is a water circulation path for a heat medium such as water.

In the center unit 10, the first refrigerant flow port 11a of the four-way valve 11 is located on the discharge side of the compressor 12, and the second refrigerant flow port 1 is located on the discharge side of the compressor 12.
1b is connected to the suction side of the compressor 12 via the accumulator 13, the third refrigerant flow port 11C is connected to one end of the air heat exchanger 14, and the fourth refrigerant flow port lid is connected to one end of the water heat exchanger 15. Furthermore, an expansion valve 16 is provided between the other ends of each heat exchanger 14,15.

The terminal units 20a to 20e have a first refrigerant flow port 21a of the four-way valve 21 on the discharge side of the compressor 22, a second refrigerant flow port 21b on the suction side of the compressor 22 via the accumulator 23, and a third A fourth refrigerant flow port 21c is connected to one end of the water exchanger 24, a fourth refrigerant flow port 21d is connected to one end of the air heat exchanger 25, and an expansion valve 2 is connected between the other ends of each heat exchanger 24.25.
6.

The water circulation path 30 is connected to the water heat exchanger 1 of the center unit 10.
5 and the inlet 24a of the water heat exchanger 24 of each terminal unit 20a to 20e are connected via the circulation pump 31, and the inlet 15b of the water heat exchanger 15 and the outlet 24b of the water heat exchanger 24 are connected via the circulation pump 31. and are connected via a flow rate adjustment valve 32.

In this residential building air conditioner, when performing cooling operation, the refrigerant in each compressor 12, 22 circulates as shown by the solid line arrow in FIG. The water in the water heat exchanger 24 of each terminal unit 20 is heated. In addition, when performing heating operation, the refrigerant in the six compressors 12.22 is -
The water circulates as shown by the dotted chain arrow, and the water in the water heat exchanger 15 is heated, and the water in the water heat exchanger 24 is cooled. In addition, in this air conditioning operation, each water heat exchanger 15.
Since the water in the water heat exchangers 15 and 24 is mutually circulated through the water circulation path 30 as shown by the broken line arrows in FIG. 2(b), heat is efficiently exchanged in each of the water heat exchangers 15 and 24.

(Problem to be Solved by the Invention) However, the conventional air conditioner for a residential building has a large number of terminal units 20a to 20e, and when each of the terminal units 20a to 20e is operated simultaneously for cooling or heating. In this case, a large inrush current is applied to the large compressor 12 of the center unit 10, and an excessive load is applied to the electric power system when the compressor 81!12 starts operating, causing problems in starting the compressor 12 due to the voltage drop. Otherwise, it may cause flicker (voltage fluctuations) in the power system, or even reduce the stability of the power system. ), there was a problem that the compressor 12 could not repeatedly start and stop stably or output a predetermined output.

In view of the above-mentioned conventional problems, an object of the present invention is to avoid adding a temporary overload to the power system due to the activation of the compressor of the center heat pump unit, even in a small-capacity power system such as a cogeneration system. An object of the present invention is to provide an air conditioner for a residential building that can maintain the stability of the power system and thereby perform stable air conditioning operation.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a center heat pump unit and a plurality of terminal heat pump units, and a heat medium heat exchanger of the center heat pump unit and a heat medium heat exchanger of the terminal heat pump units. In an air conditioner for a residential building having a heat medium circulation path for circulating a heat medium between a medium heat exchanger, a plurality of compressors of the center heat pump unit are provided, and the temperature of the heat medium in the heat medium circulation path is controlled. a temperature sensor to detect, a selection circuit that selects a number of the compressors corresponding to the temperature detected by the temperature sensor, and a timer circuit that sequentially starts the six compressors selected by the selection circuit at predetermined time intervals. It is characterized by having the following.

Further, the second invention includes a center heat pump unit and a plurality of terminal heat pump units, and circulates a heat medium between the heat medium heat exchanger of the center heat pump unit and the heat medium heat exchanger of each terminal heat pump unit. In an air conditioner for a residential building having a heat medium circulation path,
The center heat pump unit is composed of a plurality of outdoor heat pump units, and includes a temperature sensor that detects the temperature of the heat medium in the heat medium circulation path, and a compression unit of each of the outdoor heat pump units whose number is adapted to the temperature detected by the temperature sensor. The present invention is characterized in that it includes a selection circuit for selecting a heat pump unit, and a timer circuit for sequentially starting the outdoor heat pump units selected by the selection circuit at predetermined time intervals.

(Function) According to the first invention, the temperature sensor detects the temperature of the heat medium in the heat medium circulation circuit, and the selection circuit selects a number of compressors corresponding to the temperature detected by the temperature sensor in one center. Select from each compressor of the heat pump unit. Each of the selected compressors is sequentially activated at predetermined time intervals by a timer circuit.

According to the second aspect of the invention, a number of outdoor heat pump units corresponding to the temperature detected by the temperature sensor is selected, and the selected outdoor heat pump units are sequentially activated at predetermined time intervals by a timer circuit.

(Example) Figure 1 (a) (b) (c) (d) (e) (f
) (g) shows a first embodiment of the air conditioner for a residential building according to the present invention, and the same components as in the conventional example are denoted by the same symbols.

That is, 10' is a center unit, 20a arrangement 20e is a terminal unit, 11.21 is a four-way valve, lla to lid, 2
1a to 21d are first to fourth refrigerant flow ports 12a to 12e of the four-way valve 11.21.

22 is a compressor, 13.23 is an accumulator, 14.2
5 is an air heat exchanger, 15.24 is a water heat exchanger, 16.2
6 is an expansion valve, and as in the conventional example, each unit 10-. 20
A to 20e constitute a heat pump cycle by each device 11 to 16 and 21 to 26.

This center unit 10' has its compressors 12a to 12.
e is the compressor 22 of the terminal units 20a to 20e, respectively.
The four-way valves 11 and 13 are connected in parallel between the first refrigerant flow port 11a of the four-way valve 11 and the accumulator 13, respectively, as shown in FIG. 1(b).

30 is a water circulation path, which is connected to the center unit 1 as in the conventional example.
0' water heat exchanger 15 is connected to each terminal unit 20a to 20e.
It is connected in parallel to the water heat exchanger 24 via a circulation pump 31 and a flow rate control valve 32. Further, a temperature sensor 33 is provided between the flow rate control valve 32 of the water circulation path 30 and the inlet 15b of the water heat exchanger 15 to detect the temperature of the circulating water in the water circulation path 30.
has been established.

FIG. 1(e) is a block diagram showing a drive control circuit for the compressors 128-12e. In the figure, 40 is a microcomputer which stores a selection circuit 41 for selecting each compressor 12a to 12e corresponding to the temperature detected by the temperature sensor 33, and each compressor 12a to 12e corresponding to the detected temperature by the temperature sensor 33. ROM 42 and each selected compressor 12a to 12
A timer circuit 4 that sequentially starts or stops e at predetermined time intervals.
3, and drives and controls each of the compressors 12a to 12e as shown in FIG. 1(d).

That is, when the power switch (not shown) is turned on and the air conditioning operation is performed, the temperature difference, that is, the detected temperature of the temperature sensor 33 and the set temperature (approximately 25° C. to 30° C., in the embodiment, 26° C.
The set temperature is ℃. ), for example, when the absolute value part 1 degree (hereinafter referred to as temperature difference) ΔT is "8℃≦ΔT" (
When the air conditioning load is large), the compressors 12a to 12e are
Drive sequentially at 5 second intervals. Similarly, “6℃≦ΔT
When the temperature is <8°C, each compressor 12b to 12e
When ΔT<6°C, each compressor 12c to 12e is
℃≦ΔT<4℃”, the compressors 12d and 12e are driven sequentially at 15 second intervals.

Also, when "1℃≦ΔT<2℃", the compressor 12e is driven, and when "ΔT<1℃" (when the air conditioning load is small)
does not drive any of the compressors 12a to 12e.

On the other hand, when each compressor 12a to 12e is driven, the water circulation path 3
When the water temperature within 0 changes and becomes "ΔT<1℃", each compressor 12e to 12a is changed, and when "1℃≦ΔT<2℃", each compressor 12d to 12g is changed, and "2℃≦ When ΔT<4°C, each compressor 12c to 12a is set to 4°C≦ΔT<6°C.
In this case, each compressor 12b, 12a is stopped. Also,"
When 6℃≦ΔT<8℃, the compressor 12a is stopped and the
℃≦ΔT”, each compressor 12a to 12e continues to be driven.

According to this embodiment, when performing cooling operation, each compressor 12
The refrigerants a to 12e and 22 flow as in the conventional example as shown by solid line arrows in FIG. 1(b), and the water heat exchanger 15 cools the circulating water, and the water heat exchanger 24 cools the circulating water. Heat.

Also, when performing heating operation, each compressor 12a to 12
The refrigerant 22 circulates as shown by the dotted chain arrow in FIG. 1(b), the water heat exchanger 15 heats the circulating water, and the water heat exchanger 24 cools the circulating water.

In this air-conditioning operation, the high-temperature or low-temperature circulating water of the water heat exchanger 24 is circulated to the water heat exchanger 15 and heated to a predetermined temperature, as shown by the broken line arrow in FIG. 1(b), as in the conventional example. Alternatively, it is cooled and circulated into the water heat exchanger 24 again.

Thereby, heat exchange between the refrigerant and water is effectively performed in the water heat exchangers 24 of the terminal units 20a to 20e, and hot air or cold air is blown out from the air heat exchanger 25.

Further, in the cooling operation in summer, a large number of terminal units 20a to 20e are driven, and the amount of heat released from the water heat exchanger 24 increases, so the temperature of the circulating water in the water circulation path 30 tends to increase.

Here, for example, when the temperature difference ΔT at the start of operation is 8° C. or more, each of the five compressors 12a to 12e is sequentially started at 15 second intervals as shown in FIG. 1(e). Thereafter, thermo-operation is performed depending on the temperature of the circulating water, and even during this operation, the timer circuit 43 restarts each of the compressors 12a to 12e at 15-second intervals.

Furthermore, in the heating operation in winter, a large number of terminal units 20a to 20e are driven, and the amount of heat absorbed by the water heat exchanger 24 increases, so the temperature of the circulating water in the water circulation path 30 tends to decrease. Here, for example, at the start of operation, the temperature difference ΔT
When the temperature is below 8°C, each of the five compressors 12a to 12e starts sequentially at 15 second intervals, as shown in Fig. 1(f), and their starting and stopping will continue during subsequent thermo-operation. This is done at 15 second intervals.

Furthermore, in the intermediate period such as spring growth and autumn,
Since cooling operation and heating operation are mixed in each terminal unit 20a to 20e, the temperature of the circulating water tends to be maintained at around 26°C. Here, for example, when the temperature difference ΔT at the start of operation is "2°C≦ΔT<4°C", the two compressors 12d and 12e are
are started sequentially at 15 second intervals, and when the temperature difference ΔT becomes "ΔT<1℃" during the subsequent thermo-operation, each compressor 12
All of a to 12e will stop.

As described above, in the residential building air conditioner according to this embodiment, each compressor 12a to 12e restarts at 15 second intervals not only when the air conditioning operation is started but also during thermostat operation, so that it is possible to restart the compressors 12a to 12e at intervals of 15 seconds. An excessive load is not applied to one compressor 12, and stable air conditioning operation can be performed.

3(a) and 3(b) show a second embodiment of the present invention, in which the center unit has five outdoor heat pump units (hereinafter referred to as outdoor units) 10a to 10e each having a small capacity compressor 12'. A stand is set up. The water circulation path 30' is connected to the outlet 15a of the water heat exchanger 15 of each outdoor unit 10a to 10e and the water heat exchanger 2 of each terminal unit 20a to 20e.
4 are connected in parallel via a circulation pump 31, and the inlet 15b of the water heat exchanger 15 and the outlet 24b of the water heat exchanger 24 are each connected in parallel via a flow rate adjustment valve 32. are doing. In addition, each outdoor unit 10
a to 10e are installed outdoors, and the other terminal units 20a
~20e is installed indoors. Moreover, the air heat exchanger 14 of each outdoor unit 10a-10e is arranged in the path on the tip side of the ventilation duct 50 of each terminal unit 20a-20e.

According to this embodiment, as in the conventional example, the refrigerant flows as shown by the solid line arrow in FIG. The circulating water in the passage 30' flows as indicated by the dashed arrow. Therefore, when performing cooling operation, each terminal unit 20a to
The low-temperature air blown from the air heat exchanger 25 of the outdoor unit 20e is sent to the air heat exchanger 14 of each outdoor unit 10a to 10e via the ventilation duct 50 as shown by the white arrows in FIGS. 3(a) and 3(b). Also, during heating operation, high-temperature air is blown out to the air heat exchanger 14.

As a result, the heat dissipation or heat absorption in the air heat exchanger 14 is efficiently performed, and each outdoor unit) 10a to
The operating efficiency of 10e is improved.

Further, similarly to the first embodiment, the compressors 12' of each outdoor unit 10a to 10e are selected in accordance with the temperature detected by the temperature sensor 33, and the selected compressors 12' are activated at predetermined time intervals. You can control the number of units. still,
Other configurations and effects are similar to those of the first embodiment.

FIG. 4 shows a third embodiment of the present invention, in which two outdoor knits 10a to 10 having the same structure as the second embodiment are shown.
e and terminal units 20a to 20e are installed indoors. In this case, an outside air intake duct 60 communicating with the outdoors is provided, and an air heat exchanger (not shown) of each outdoor unit 10a to 10e is installed in the path of each outside air intake duct 60. Note that the other configurations and effects are the same as those of the second embodiment.

(Effects of the Invention) As explained above, according to the first invention, the number of compressors adapted to the temperature detected by the temperature sensor is selected from each compressor of one center heat pump unit, and the selected Since each compressor is activated sequentially at predetermined time intervals by a timer circuit, there is no excessive load on a single compressor as in the past, improving the stability of the electrical system and ensuring stable air conditioning operation. It has the advantage of being able to

According to the second invention, a number of outdoor heat pump units corresponding to the temperature detected by the temperature sensor is selected, and the selected outdoor heat pump units are sequentially activated at predetermined time intervals by a timer circuit. Therefore, like the first invention, there is an advantage that stable air conditioning operation can be performed.

[Brief explanation of the drawing]

1(a) to 1(g) show a first embodiment of the present invention, FIG. 1(a) is a schematic configuration diagram of an air conditioner for a residential building, and FIG. 1(b) is a schematic diagram of an air conditioner for a residential building. Figure 1(e) is a detailed diagram of the air conditioner for air conditioning, and Figure 1(d) is a block diagram showing the drive control circuit for each compressor.
) is a flowchart showing the drive control of the microcomputer, FIG. 1(e) is a graph showing an example of the driving state of each compressor in summer, and FIG. 1(r) is a graph showing an example of the driving state of each compressor in winter. The graph shown in FIG. 1(g) is a graph showing an example of the driving state of each compressor in the intermediate period,
Figures 2(a) and (b) show conventional examples;
) is a schematic configuration diagram of an air conditioner for a residential building, FIG. 2(b) is a detailed diagram of the air conditioner for a residential building, and FIGS. 3(a) and (b) show a second embodiment of the present invention. , FIG. 3(a) is a schematic configuration diagram of an air conditioner for a residential building, FIG. 3(b) is a detailed diagram of the air conditioner for a residential building, and FIG. 4 is a diagram of a residential building according to a third embodiment of the present invention. 1 is a schematic configuration diagram of a commercial air conditioner. In the figure, 10-. 10a-10e...Outdoor heat pump unit, 12", 12a-12e...Compressor, 15
．． 24... Water heat exchanger, 20a-20e... Terminal heat pump unit, 30. 30-... Water circulation path, 3
3... Temperature sensor, 41... Selection circuit, 43...
timer circuit. Patent applicant Sanden Corporation

Claims (2)

[Claims] (1) Heat medium circulation comprising a center heat pump unit and a plurality of terminal heat pump units, and circulating a heat medium between the heat medium heat exchanger of the center heat pump unit and the heat medium heat exchanger of each terminal heat pump unit. An air conditioner for a residential building having a plurality of compressors of the center heat pump unit, a temperature sensor for detecting the temperature of the heat medium in the heat medium circulation path, and a number of compressors adapted to the detected temperature of the temperature sensor. An air conditioner for a residential building, comprising a selection circuit for selecting each of the compressors, and a timer circuit for sequentially starting each of the compressors selected by the selection circuit at predetermined time intervals. (2) Heat medium circulation comprising a center heat pump unit and a plurality of terminal heat pump units, and circulating a heat medium between the heat medium heat exchanger of the center heat pump unit and the heat medium heat exchanger of each terminal heat pump unit. In the air conditioner for a residential building having a passageway, the center heat pump unit is configured with a plurality of outdoor heat pump units, and a temperature sensor that detects the temperature of the heat medium in the heat medium circulation path, and a temperature sensor adapted to the temperature detected by the temperature sensor. a selection circuit that selects a number of the outdoor heat pump units, and a timer circuit that sequentially activates the outdoor heat pump units selected by the selection circuit at predetermined time intervals. Air conditioner.