JP2718366B2 - Air conditioner operation control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation control method of a hot water circulation heating type air conditioner having a cooling function and a heating function and circulating hot water in a hot water circulation circuit to perform a heating operation.

[0002]

2. Description of the Related Art Conventionally, a hot water circulation heating type air conditioner having a cooling function and a heating function and circulating hot water in a hot water circulation circuit to perform a heating operation usually includes a refrigerant circulation circuit and a hot water circulation circuit. The hot water circulation circuit includes a water heater having a heat exchanger and a heat source, a circulation pump, an indoor heat exchanger (radiator) incorporated in an indoor unit having an indoor fan, and a hot water flow control valve. have. During the heating operation of such an air conditioner, a temperature difference ΔT = Ts−Tr between the set temperature Ts and the indoor temperature Tr is generally adopted as a parameter of room temperature control, and a hot water circulation circuit is performed based on the temperature difference ΔT. By adjusting the opening of the hot water flow control valve provided in the above, the flow rate of the hot water circulating in the hot water circulation circuit is adjusted, and the room temperature is controlled by fuzzy control or PID control. In addition, during the heating operation, the indoor temperature T
When r is lower than the set temperature Ts and is below the heating operation ON temperature T _ON , the heating operation is started, the water heater is turned on, the hot water flow control valve is opened, the circulation pump is turned on, and the indoor fan is driven. The hot water heated by the water heater circulates through the hot water circulation circuit to start the heating operation, and the room temperature Tr rises above the set temperature Ts and reaches the predetermined heating operation off temperature Toff. Then, the hot water flow control valve is fully closed, the circulation pump is turned off, and the indoor fan is stopped or switched to the breeze operation.

[0003]

However, in the conventional control during the heating operation, the control of the hot water flow control valve provided in the hot water circulation circuit is performed based on the temperature difference ΔT between the set temperature Ts and the room temperature Tr. The temperature of the hot water flow control valve is excessively adjusted due to the fact that the changing speed of the rise or fall of the room temperature Tr is considerably slower than the speed of adjusting the opening of the hot water flow control valve. That is, there was a risk that the hot water flow rate regulating valve would be too open or too restrictive.
For example, when the heating operation is started, the room temperature Tr does not drop sharply when the room temperature Tr rises and exceeds the set temperature Ts, and the hot water flow control valve starts to be throttled.
In order to keep rising for a certain period of time, the opening of the hot water flow control valve is controlled to be further reduced, resulting in an excessive throttle, resulting in an excessive decrease in the room temperature Tr. Then, when the room temperature Tr reaches the set temperature Ts, the hot water flow control valve starts to be opened. However, the room temperature Tr becomes too high opposite to the above-described throttling operation, and the room temperature Tr becomes large hunting near the set temperature Ts. There was a problem of doing. Here, an example of the operation of the actual room temperature control will be described with reference to FIG. 12. At the start of the heating operation, the period a: the temperature difference ΔT between the set temperature Ts and the room temperature Tr is large, The opening of the regulating valve is large. Period b: Since the temperature difference ΔT is small and the amount of change in the room temperature Tr is large, the hot water flow control valve is gradually closed. Period c: The room temperature Tr rises and exceeds the set temperature Ts.
When the temperature starts to decrease, the opening degree of the hot water flow control valve reaches the fully closed state or almost fully closed state. Period d: The opening of the hot water flow control valve is not changed because the room temperature Tr starts to decrease and the temperature difference ΔT is small. Thereafter, the periods a, b, c, and d are gradually shortened, and the amount of change in the opening of the hot water flow control valve is small, but the amount of change in the opening is too large as an absolute amount, and the room temperature Tr is large. The problem of hunting arises. On the other hand, the heating method of circulating hot water has the advantage that the heating capacity can be changed widely by adjusting the flow rate of hot water, so that the indoor temperature Tr becomes the heating operation off temperature Toff.
, The hot water flow control valve is fully closed, the circulation pump is turned off, and the heating operation is turned off, in which the indoor fan is stopped or switched to the breeze operation (see Fig. 13).
Thus, there is a problem that the above advantages cannot be utilized.

[0004] It is an object of the present invention to stabilize the room temperature quickly to a set temperature without excessively adjusting the opening of the hot water flow control valve, and to perform continuous heating operation without turning off the heating operation. To provide an air conditioner operation control method capable of performing the following.

[0005]

In order to achieve the above object, an air conditioner operation control method according to the present invention comprises a hot water circulation circuit having at least a hot water valve, and the hot water circulation circuit operates according to the room temperature during operation of the hot water circulation circuit. In the air conditioner that controls the opening of the valve, set a higher regulation value that is higher than the set value and not higher than the heating-off temperature. By forcibly squeezing and lowering the blowing temperature to a temperature that does not feel cold on the perception, when the room temperature exceeds the upper regulation value,
Forcibly squeeze the hot water valve to prevent over-throttle of the hot water valve due to the slow change rate of the indoor temperature, perform appropriate indoor temperature control, and perform comfortable heating operation control Can be. Further, by returning to the original fuzzy control when the room temperature falls to the lower regulation value lower than the upper regulation value and higher than the set temperature, the control delay is eliminated and the undershoot of the room temperature is prevented. Can be. Furthermore, at the start of the heating operation, since the high-temperature air is blown out due to the necessity of rapidly raising the indoor temperature, the indoor temperature distribution is not uniform, and a temperature difference is generated between the upper and lower sides. When the temperature falls below the lower limit, the opening of the hot water valve at that point is not changed and is kept as it is.
The true room temperature can be detected, and continuous operation can be performed without the room temperature reaching the heating-off temperature. Also,
When the indoor temperature becomes higher than the upper regulation value during the operation of the hot water circulation circuit, the flow rate of the hot water is forcibly reduced, and the state in which the blowing temperature is reduced to a temperature at which the user does not feel cold is maintained for a predetermined time, and then the indoor temperature is turned off. By shifting to the heating-off state when the temperature exceeds the temperature, the state in which the degree of opening of the hot water valve is reduced is maintained for a predetermined time even if the room temperature exceeds the upper regulation value. If it exceeds, it will not be turned off immediately, and by turning off the heating after a predetermined time has elapsed, the opening degree of the hot water valve will not be adjusted sharply, and the opening degree will be adjusted slowly.
Comfortable room temperature control is obtained. Further, when the heating-off temperature is equal to the upper regulation value, when the room temperature exceeds the heating-off temperature, the heating water is not turned off immediately and the hot-water valve is closed at a gentle speed, so that the temperature of the hot-water indoor heat exchanger temperature Th is reduced. Since the temperature change is gradual, it is possible to prevent the hot water valve from being excessively throttled. Further, by keeping the opening of the hot water valve small, the room temperature gradually approaches the set temperature, so that comfortable room temperature control can be obtained.

[0006]

An embodiment of the present invention will be described with reference to the drawings.
In FIG. 11, an outline of an air conditioner of a hot water circulation heating type to which the control method of the present invention is applied will be described.
Inside, a cooling heat exchanger or evaporator 2 and a heating heat exchanger 3 are sequentially arranged in the air flow path from an upstream side, and an indoor fan 4 is installed at a downstream position thereof. The drain pan 5 is installed below the heat exchanger 3 for heating. The refrigeration cycle is performed by a refrigerant circuit in which the evaporator 2, the compressor 7 disposed in the outdoor unit 6, the condenser 8 that is air-cooled by the outdoor fan 11, and the capillary tube (expansion device) 9 are sequentially connected by the refrigerant pipe 10. The refrigerant compressed by the compressor 7 is liquefied in the condenser 8, adiabatically expanded in the capillary tube 9, evaporated in the evaporator 2, and exchanges heat with the air around the evaporator 2. The heating heat exchanger 3 is connected to a water heating heat exchanger 13 installed in the hot water heat source unit 12 by a circulation pump.
A hot water heating circuit is formed by connection with a hot water pipe 16 via a flow control valve 14 and a flow control valve (hot water valve) 15. Flow control valve 15
Is driven by a stepping motor, the opening is determined by the number of steps, and is connected to the inlet side of the heating heat exchanger 3.

[0007] The control device 17 includes an indoor temperature Tr detected by an indoor temperature detecting device 18 such as an indoor temperature sensor and a cooling temperature detected by an indoor heat exchanger temperature sensor 20 such as a temperature sensor provided in the evaporator 2. The side indoor heat exchanger temperature Tc, the hot water indoor heat exchanger temperature Th detected by the indoor heat exchanger temperature sensor 21 such as the temperature sensor provided in the hot water indoor heat exchanger 3, and the setting device 19 set the temperature. The set temperature Ts is inputted, and the indoor fan 4, the compressor 7 of the cooling circuit and the outdoor fan 1
1, and outputs a control signal to the hot water heat source unit 12 of the heating circuit, the circulation pump 14 and the hot water valve 15. During the cooling operation, the indoor fan 4, the compressor 7 and the outdoor fan 11 are operated, and the hot water heat source unit 12 is operated. Then, the circulation pump 14 and the hot water valve 15 are turned off. During the dehumidifying operation, the indoor fan 4 and
The compressor 7 and the outdoor fan 11 of the cooling circuit, the hot water heat source device 12 and the circulation pump 14 of the heating circuit, and the hot water valve 15 are turned on. Further, during the heating operation, the indoor fan 4, the hot water heat source device 12 and the circulation pump 14 of the heating circuit are operated, the opening degree θ of the hot water valve 15 is adjusted, and the compressor 7 and the outdoor fan 11 of the cooling circuit are turned off. .

Next, referring to the flowchart of FIG.
The heating operation control operation of the embodiment will be described. A preset set temperature Ts and a preset first specified value α
(For example, α = 2 ° C.) and a second specified value β (for example, β =
1 ° C.) and the set temperature Ts to a first specified value α (α
= 2 ° C.) and a lower limit value Tb = Ts + β obtained by adding a second specified value β (β = 1 ° C.) to the set temperature Ts. However, the upper regulation value Ta
Is equal to or lower than a separately set heating-off temperature Toff (Ta
≤ Toff). When the indoor temperature Tr is equal to or lower than the upper regulation value Ta (Tr ≦ Ta = Ts + α = Ts + 2), the indoor temperature control by the fuzzy inference calculation is performed (A to FIG. 2).
C). In FIG. 2, period A: the opening degree of the hot water flow control valve is large because the temperature difference ΔT between the set temperature Ts and the room temperature Tr is large. Period B: Since the temperature difference ΔT becomes small and the amount of change in the hot water indoor heat exchanger temperature Th is large, the hot water flow control valve is gradually closed. Period C: The room temperature Tr rises and exceeds the set temperature Ts.
When the temperature starts to decrease, the opening degree of the hot water flow control valve reaches the fully closed state or almost fully closed state.

In the indoor temperature control based on the fuzzy inference calculation, a predetermined calculation time Δt (for example, 2 minutes)
A fuzzy calculation is performed for each elapse, and a temperature difference ΔT (ΔT = Ts−Trn), which is a difference between the set temperature Ts and the current room temperature Trnow.
ow) is applied to FIG. 3 to determine an input membership value by a membership function of the temperature difference ΔT, thereby obtaining temperature difference fuzzy data. The membership function of the temperature difference ΔT is as follows. N: up to 1.0 Trnow is higher than Ts (ΔT ≦ -Δ ₁
, ΔT = 0, minimum 0). ZO: just good (1.0 at the maximum when ΔT = 0, ΔT = −Δ
_1, the minimum 0 + Δ _2). PS: Trnow is slightly lower than Ts (up to [Delta] T = + delta ₂
1.0, [Delta] T = 0, the minimum 0 + Δ _3). PM: up to Trnow is slightly lower than Ts (ΔT = + Δ ₃
1.0, ΔT = + Δ _2, minimum 0 + delta _4). PB: Trnow up lower than Ts (ΔT ≧ + Δ ₄ 1.0
Minimum 0 at ΔT = + Δ _3). Note that Δ ₁ , Δ ₂ , Δ ₃ , and Δ ₄ are predetermined temperature differences Δ
The value of T, for example, Δ ₁ = Δ ₂ = 1 degree, Δ ₃ = 4 degrees,
Δ ₄ = 7 degrees.

Applying the temperature change ΔTh = Thnow−Thold of the heat exchanger in the hot water chamber calculated by the current heat exchanger temperature Thnow in the hot water chamber and the previous heat exchanger temperature Thold in the previous hot water chamber to FIG. An input membership value is obtained by a membership function of the exchanger temperature change amount ΔTh, and fuzzy data of the heat exchanger indoor heat exchanger temperature change amount is obtained. The membership function of the heat exchanger indoor heat exchanger temperature change amount ΔTh is shown below. NB: The state in which Th is lower than the time of the previous fuzzy calculation has elapsed.
(Maximum 1.0? Th = - [delta _4, minimum 0 ΔTh = -δ ₃₎ NM: Th is slightly lower state elapsed than the previous fuzzy calculation. (Maximum 1.0 _{ΔTh = -δ 3, ΔTh = -δ} 4, -δ
Th is slightly lower state elapsed than the previous fuzzy calculation: Min 0) NS _2. (Maximum 1.0 when ΔTh = −δ ₂ , ΔTh = −δ ₃ , −δ
Th does not change from the previous fuzzy calculation: Min 0) ZO _1. (-
1.0 at the maximum when δ ₁ ≦ ΔTh ≦ + δ ₁ and 0 at the minimum when ΔTh = ± δ ₂ ) PS: The state where Th is slightly higher than that in the previous fuzzy calculation has elapsed. (Maximum 1.0 when ΔTh = + δ ₂ , ΔTh = + δ ₁ , + δ
₃ : minimum 0) PM: Th has been a little higher than the previous fuzzy calculation. (Maximum 1.0 when ΔTh = + δ ₃ , ΔTh = + δ ₂ , + δ
Th is elapsed higher than the previous fuzzy calculation: Min 0) PB at _4.
(Maximum 1.0? Th = + [delta] _4, the minimum 0 ΔTh = + δ _{3) Incidentally, δ 1, δ 2, δ} 3, δ 4 are predetermined values of the fuzzy operation between indoor temperature change amount? Th was, for example, δ ₁ =
0.4 degrees, δ ₂ = 2 degrees, δ ₃ = 4 degrees, and δ ₄ = 6 degrees.

An output membership value is obtained for all of the fuzzy data of the room temperature change amount ΔTh and the fuzzy data of the temperature difference ΔT during the calculated fuzzy operation with reference to the control rule shown in FIG. The output membership function is defined by the following seven fuzzy variables. NB: Hot water valve opening is small. NM: Hot water valve opening slightly small. NS:
Hot water valve opening slightly small. ZO: During hot water valve opening. PS: Hot water valve opening slightly large. PM:
Hot water valve opening is slightly large. PB: Hot water valve opening is large.

The above control rules are as follows. R1: The amount of change in the heat exchanger temperature in the hot water chamber ΔTh = NB (the state in which the heat exchanger temperature Th in the hot water chamber is lower than that in the previous fuzzy calculation has elapsed), and the temperature difference ΔT = N (current room temperature Trnow).
Is higher than the set temperature Ts), the output membership function is PS (the hot water valve opening is slightly large). In other words, the state in which the room temperature Tr after the previous fuzzy calculation has been lower than that of the previous fuzzy calculation has elapsed, and the current room temperature Trn
When ow is higher than the set temperature Ts, the opening of the hot water valve 15 is made slightly large. R2: when the amount of change in the heat exchanger temperature in the hot water chamber ΔTh = NB (the state in which the heat exchanger temperature Th in the hot water chamber is lower than that in the previous fuzzy calculation) and the temperature difference ΔT = ZO (just right),
The output membership function is PM (slightly larger hot water valve opening). In other words, if the room temperature Tr after the previous fuzzy calculation has been lower than the previous fuzzy calculation and the current room temperature Trnow is equal to the set temperature Ts, the hot water valve
Increase the opening of 15. Hereinafter, similarly, 35 control rules are shown up to R35, and as output membership values (grade values),
The input membership value (grade value) of the room temperature change amount ΔTh and the temperature difference ΔT are compared, and the smaller grade value is adopted (min. Calculation). For example, when the room temperature change amount ΔTh = NB shown in R3 and the temperature difference ΔT = PS, the grade value of the fuzzy variable NB for the room temperature change amount ΔTh and the grade value of the fuzzy variable PS for the temperature difference ΔT In comparison, the smaller value is adopted.

The above control rules are referred to for all fuzzy data, and based on the fuzzy data of the heat exchanger temperature change ΔTh and the fuzzy data of the temperature difference ΔT based on the output membership value obtained by the min. max.
An operation is performed, and a single point operation (inverse fuzzy operation) is performed using the obtained output membership composite value. The one-point arithmetic expression is obtained by modifying the gravity center arithmetic expression f _w = 式 f (x) ・ dx / ・ f (x) dx, and G = (a ・ A + b ・ B + c ・ C + d ・ D + e ・ E + f ・
F + h.H) / (A + B + C + D + E + F + G), and the calculated G is a control amount of the step position of the step motor for driving the hot water valve 15. However, A:
NB output membership composite value, B: NM output membership composite value, C: NS output membership composite value,
D: ZO output membership composite value, E: PS output membership composite value, F: PM output membership composite value, H: PB output membership composite value. Also,
a, b, c, d, e, f, and g are weighting coefficients (for example, a = -6, b = -4, c = -2, d = 0, e = +
2, f = + 4, g = + 6).

The sum of the calculated step position control amount G to the previous step position (current actual step position) Go is the current hot water valve address (target step position Gs).
), The target step number S corresponding to the target step position Gs is obtained from the hot water valve characteristic table prepared in advance.
And the actual step number So corresponding to the previous step position Go (the actual step position at the present time since the hot water valve has not been driven from the previous time) is the number of drive steps (control amount) for driving the stepping motor of the current hot water valve. ) Sm (Sm = S-So), and outputs a control signal corresponding to the number of drive steps Sm to the stepping motor to drive the stepping motor to the target step position Gs and adjust the opening of the hot water valve.

The step position of the hot water valve 15 is set so that the flow rate-step position characteristic of the hot water valve 15 is linear. The number of steps of the stepping motor corresponding to each step position depends on the flow characteristic of the hot water valve. It is determined experimentally in advance. For example, as shown in Table 1 of FIG.
In this example, 64 steps are taken from the fully closed position to the fully open position, and the number of drive pulses from the reference point of the stepping motor corresponding to each step position, that is, the fully closed position is obtained.

By adopting the hot water indoor heat exchanger temperature Th and the hot water indoor heat exchanger temperature change amount ΔTh as input parameters, a quicker response than the indoor temperature Tr change can be obtained, and the hot water valve 15 opens excessively. The temperature adjustment can be prevented, and the room temperature Tr can be quickly stabilized.

On the other hand, in the flowchart of FIG. 1, the room temperature Tr exceeds the upper limit value Ta (Tr> Ta = T a).
In the case of s + α = Ts + 2), the fuzzy calculation is not performed, and the hot water valve 15 is driven at a preset driving speed θv (for example, θv =
(1 step / 40 seconds) to forcibly drive in the closing direction (D in FIG. 2). The degree of opening of the hot water valve 15 is reduced, the flow rate of the hot water decreases, the temperature Th of the heat exchanger inside the hot water decreases, and the temperature Th of the heat exchanger inside the hot water chamber becomes a predetermined lower limit specified value Tc (for example, Tc = 35). (° C.) or less (Th ≦ Tc = 35 ° C.), the opening of the hot water valve 15 at that point is not changed and is kept as it is (E in FIG. 2). In addition, the heat exchanger temperature T
The lower limit specified value Tc of h is preferably set to a temperature at which chills are not felt since the temperature of the blown air from the indoor unit 6 is substantially equal to the temperature Th of the hot water indoor heat exchanger. For example, Tc ≦ 30 ° C. Then it feels chilly so Tc = 35
C is one suitable value. Also, not when the hot water indoor heat exchanger temperature Th becomes lower than the lower limit specified value Tc, the hot water valve 15 sets the hot water indoor heat exchanger temperature T near the lower limit specified value Tc.
The lower limit setting opening θs (eg, θs = 10 and the hot water flow rate is approximately 0.5
l / min.).

The room temperature Tr decreases, and the room temperature Tr is lower than or equal to the lower regulation value Tb (Tr ≦ Tb = Ts + β = Ts +
When 1) is reached, the process shifts to the fuzzy control described above (F in FIG. 2). Further, the heat exchanger temperature Th in the hot water chamber is set to the lower limit specified value T.
Before the temperature falls below c (or the hot water valve 15 reaches a predetermined lower limit opening θs), the room temperature Tr decreases, and the room temperature Tr becomes lower than or equal to the lower regulation value Tb (Tr ≦ Tb =
When Ts + β = Ts + 1), the process directly proceeds to the fuzzy control described above (F in FIG. 2).

According to the above-described structure, when the indoor temperature Tr exceeds the upper regulation value Ta higher than the set temperature Ts, the hot water valve 15 is forcibly forced until the hot water indoor heat exchanger temperature Th becomes lower than the lower limit specified value Tc. , It is possible to prevent the hot water valve 15 from being excessively throttled due to the slow change speed of the indoor temperature Tr, to perform appropriate indoor temperature control, and to perform comfortable heating operation control. . It should be noted that the control device is simplified by returning to the original fuzzy control when the hot water valve 15 reaches the lower limit setting opening θs, not when the temperature Th of the hot water indoor heat exchanger falls below the lower limit specified value Tc. At the same time, it is possible to prevent the hot water valve 15 from being excessively throttled, perform appropriate indoor temperature control, and perform comfortable heating operation control. Also, when the room temperature Tr is
The lower regulation value Tb slightly higher than the set temperature Ts (Tb <T
By returning to the original fuzzy control at the time when the temperature falls to a), the control delay can be eliminated and the undershoot of the room temperature Tr can be prevented. Further, at the start of the heating operation, since the high-temperature air (for example, 50 ° C.) is blown out due to the necessity of rapidly raising the room temperature Tr, the temperature distribution in the room is not uniform, and a temperature difference is generated vertically. When the temperature Th of the heat exchanger in the hot water chamber becomes lower than the lower limit specified value Tc, the opening of the hot water valve 15 at that time is not changed and is maintained as it is, so that a low temperature wind (for example, about 35 ° C.) blows out. Uniform indoor temperature distribution,
The true room temperature Tr can be detected, and the room temperature Tr can be detected.
Can be operated continuously without reaching the heating-off temperature.

Next, referring to the flowchart of FIG.
To explain the embodiment, when the room temperature Tr exceeds the upper regulation value Ta (Tr> Ta = Ts + α = Ts + 2), the fuzzy calculation is not performed, and the hot water valve 15 is moved to a predetermined drive speed θv (θv = 1 step / 40 sec) forcibly in the closing direction, reducing the opening of the hot water valve 15 to reduce the flow rate of hot water, the temperature Th of the hot water indoor heat exchanger falls, and the temperature of the hot water indoor heat exchanger Th is equal to or less than the lower limit specified value Tc (Th ≦ Tc = 35)
° C) (or the hot water valve 15 is set to the lower limit specified value Tc).
When the temperature reaches the lower limit set opening θs corresponding to the hot water flow rate at which the nearby hot water indoor heat exchanger temperature Th can be obtained), the opening of the hot water valve 15 at that time is not changed,
Hold as it is, the heating load is large, and the indoor temperature Tr is lower than or equal to the lower regulation value Tb (Tr ≦ Tb = Ts + β = Ts + 1)
, The process shifts to the normal fuzzy control (see FIG. 8). The operation up to this point is the same as in the first embodiment.

Here, the state where the room temperature Tr does not decrease below the lower regulation value Tb (Tr> Tb = Ts + β = Ts + 1) after a predetermined time t ₁ (for example, t ₁ = 6 minutes) elapses. The room temperature Tr becomes the heating-off temperature Toff (T
If off ≧ Ta) or less (Tr ≦ Toff), the heating load is small, and the opening of the hot water valve 15 is not changed and is kept as it is (see FIG. 9). On the other hand, when the room temperature Tr exceeds the heating-off temperature Toff (Tr> Toff), the heating load is extremely small, the hot water valve 15 is fully closed, and the heating-off state (monitoring state) is entered (FIG. 10).

In this configuration, if the heating-off temperature Toff is equal to the upper regulation value Ta, when the room temperature Tr exceeds the heating-off temperature Toff (Tr> Toff = Ta),
By closing the hot water valve 15 at a gentle speed without immediately turning off the heating, the temperature change of the heat exchanger temperature Th in the hot water chamber is gradual. Further, by keeping the opening of the hot water valve 15 small or keeping it at the lower limit setting opening θs, the room temperature Tr gradually approaches the set temperature, so that comfortable room temperature control can be obtained. Furthermore, the heating-off temperature Toff higher than the upper regulation value Ta (Toff> Ta) Then, even the room temperature Tr exceeds the upper regulation value Ta, a state of small opening degree of the hot water valve 15 a predetermined time t ₁ Therefore, when the room temperature Tr exceeds the heating-off temperature Toff (Tr> Toff = Ta),
As in the conventional control method shown in FIG. 12, not be immediately and heating off, by the heating off after the predetermined time t ₁ has elapsed, without adjustment of the opening degree of the abrupt hot water valve 15,
By performing the gentle opening adjustment, comfortable room temperature control can be obtained.

[0023]

Since the present invention is constructed as described above, it has the following effects. Set a higher regulation value that is higher than the set value and not higher than the heating-off temperature, and when the indoor temperature exceeds the upper regulation value during operation of the hot water circulation circuit, forcibly reduce the flow rate of hot water and feel the blowing temperature as cold When the indoor temperature exceeds the upper regulation value, the hot water valve is forcibly squeezed to prevent the hot water valve from being excessively throttled due to the slow change rate of the indoor temperature. In addition, appropriate indoor temperature control can be performed, and comfortable heating operation control can be performed. Further, by returning to the original fuzzy control when the room temperature falls to the lower regulation value lower than the upper regulation value and higher than the set temperature, the control delay is eliminated and the undershoot of the room temperature is prevented. Can be. Furthermore, at the start of the heating operation, since the high-temperature air is blown out due to the necessity of rapidly raising the indoor temperature, the indoor temperature distribution is not uniform, and a temperature difference is generated between the upper and lower sides. When the temperature falls below the lower limit, the opening of the hot water valve at that point is not changed and is kept as it is, so that low-temperature air that is not cold on the sensation blows out and the indoor temperature distribution is uniformed, and the true indoor temperature Can be detected,
Continuous operation is possible without the room temperature reaching the heating-off temperature. Also, when the indoor temperature becomes higher than the upper regulation value during the operation of the hot water circulation circuit, the hot water flow rate is forcibly reduced,
After holding the state of reducing the blowing temperature to a temperature that does not feel cold on the bodily sensation for a predetermined time, by shifting to the heating off state when the room temperature exceeds the heating off temperature, even if the room temperature exceeds the upper regulation value, Since the state in which the opening of the hot water valve is reduced is held for a predetermined time, the heating is not immediately turned off when the room temperature exceeds the heating-off temperature, and the heating is turned off after a predetermined time has elapsed.
Smooth adjustment of the opening of the hot water valve is not performed without abrupt adjustment of the opening of the hot water valve, so that comfortable indoor temperature control can be obtained.
When the heating-off temperature is equal to the upper regulation value, when the room temperature exceeds the heating-off temperature, the heating water is not turned off immediately and the hot water valve is closed at a slow speed,
Since the temperature change of the hot water indoor heat exchanger temperature Th is gradual, it is possible to prevent the hot water valve from being excessively throttled. Further, by keeping the opening of the hot water valve small, the room temperature gradually approaches the set temperature, so that comfortable room temperature control can be obtained.

[Brief description of the drawings]

FIG. 1 is a flowchart of a control operation according to a first embodiment of the present invention.

FIG. 2 is a time chart of an operation according to the present invention.

FIG. 3 is a membership function of a temperature difference ΔT according to the present invention.

FIG. 4 shows a temperature change Δ of a heat exchanger in a hot water room according to the present invention.
Th membership function.

FIG. 5 is a control rule of fuzzy control according to the present invention.

FIG. 6 is an object table of the opening degree of the hot water valve and the number of driving steps.

FIG. 7 is a flowchart of a control operation according to a second embodiment of the present invention.

FIG. 8 is a time chart showing a control operation when a heating load is large in the second embodiment.

FIG. 9 is a time chart showing a control operation when a heating load is slightly small in the second embodiment.

FIG. 10 is a time chart showing a control operation when a heating load is small in the second embodiment.

FIG. 11 is a schematic configuration diagram illustrating an example of an air conditioner to which the present invention is applied.

FIG. 12 is a time chart of a conventional movement from the start of heating to a stable state.

FIG. 13 is a time chart of a conventional heating-off state.

[Explanation of symbols]

1 indoor unit, 2 heat exchanger for cooling (evaporator) 3 heat exchanger for heating (radiator), 4 indoor fan, 5
Drain pan 6 outdoor unit, 7 compressor, 8 condenser 9 capillary tube (expansion device), 10 refrigerant piping,
11 Outdoor fan 12 Hot water heat source unit, 13 Heat exchanger for water heating, 14 Circulation pump 15 Flow control valve (Hot water valve), 16 Hot water piping, 17 Control device, 18 Detector 19 Setting device, 21 Hot water indoor heat exchanger temperature Detector

Claims (3)

(57) [Claims] 1. An air conditioner having a hot water circulation circuit having at least a hot water valve and controlling the opening of the hot water valve in accordance with the indoor temperature during operation of the hot water circulation circuit, wherein the indoor temperature is set to a heating value.
When the temperature is lower than the OFF temperature, the opening of the hot water valve is controlled by fuzzy control.
Control and set a higher regulation value that is higher than the set temperature and not higher than the heating-off temperature, and when the indoor temperature exceeds the upper regulation value during hot water circulation circuit operation ,
An operation control method for an air conditioner, wherein the control is stopped, the flow rate of hot water is forcibly reduced, and the blow-out temperature is reduced to a temperature at which the user does not feel cold. 2. The air conditioner according to claim 1, wherein the control returns to the original fuzzy control when the room temperature falls to a lower regulation value higher than the set temperature and lower than the upper regulation value. Operation control method. 3. When the indoor temperature becomes higher than or equal to the upper regulation value during the operation of the hot water circulation circuit, the flow rate of the hot water is forcibly reduced, and a state in which the blowing temperature is reduced to a temperature at which the user does not feel cold is maintained for a predetermined time. The operation control method for an air conditioner according to claim 1, wherein when the room temperature exceeds the heating-off temperature, the air conditioner is shifted to a heating-off state.