JP3482782B2 - Brine air conditioner - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brine type air conditioner for cooling indoors by circulating brine cooled in a brine-refrigerant heat exchanger provided in a refrigeration cycle to an indoor cooler. It is suitable for vehicles.

[0002]

2. Description of the Related Art In recent years, in order to prevent global warming, a vehicle air conditioner has been proposed which cools a room by changing a refrigerant in a refrigeration cycle from CFC to a combustible gas such as propane gas. See, for example, Japanese Utility Model Laid-Open No. 58-54904). In the above vehicle air conditioner, the cooler (evaporator) that cools the conditioned air by the latent heat of vaporization of the flammable gas is installed in the vehicle compartment, so the flammable gas is sealed from the pipe connection part of this cooler. There is a risk of leaking into the vehicle interior, which is a space.

Therefore, in order to avoid gas leakage into the passenger compartment, the present inventors installed a brine-refrigerant heat exchanger in the engine room (open space to the atmosphere) outside the passenger compartment, and installed this heat exchanger. At this time, the brine (water added with the component that lowers the freezing temperature) is once cooled by the latent heat of vaporization of the combustible gas, and this low temperature brine is circulated to the cooler installed in the vehicle compartment to cool the room. We are trying to develop a brine type air conditioning system for vehicles.

[0004]

By the way, in this brine type air conditioner, as a control method of the temperature of the air blown into the passenger compartment, the present inventors firstly propose hot water (engine cooling water) which is usually used in automobiles. ) Was used to adjust the heating amount in the heater (for example, an air mix method for adjusting the air flow rate ratio of cold air and warm air).

According to this temperature control method, since the conditioned air is cooled and dehumidified by the low temperature brine cooled to around 0 ° C., the cooled air is reheated to the desired temperature.
The air conditioning function is good, but on the other hand, the refrigeration cycle always cools the brine to around 0 ° C, so the amount of reheat in the heater is the same as in the middle season of spring and autumn. The larger the size, the greater the waste of energy consumption in the refrigeration cycle.

The present invention has been made in view of the above points,
In the brine type air conditioner that circulates the brine cooled in the refrigeration cycle to the indoor cooler to cool the room,
The purpose is to reduce energy consumption in the refrigeration cycle. Another object of the present invention is to achieve both reduction of energy consumption in the refrigeration cycle and securing of dehumidification function.

[0007]

In order to achieve the above object, the present invention employs the following technical means. Claims 1-4
In the invention described above, a refrigeration cycle (2) in which a flammable gas is circulated as a refrigerant, and the brine-refrigerant heat exchanger (7) absorbs and evaporates the refrigerant from the brine, and the brine-refrigerant heat exchanger ( The brine circuit (10) in which the brine cooled in 7) circulates, the hot water circuit (22) in which hot water heated by the hot water source (9) circulates, and the first air conditioner for air conditioning the first area in the room. Unit (13) and second indoor
A second air conditioning unit (14) for air conditioning the area, wherein the first air conditioning unit (13) includes a brine circuit (1
Cooler (1) that cools the conditioned air with the brine of (0)
5) and is arranged on the air downstream side of this cooler (15),
A heater (17) for heating the conditioned air by the hot water of the hot water circuit (22) and a blower (16) for blowing the conditioned air are provided, and the second air conditioning unit (14) is provided with a brine circuit (10). An air conditioning heat exchanger (18) for both cooling and heating, capable of cooling the conditioned air with a brine and heating the conditioned air with the hot water of the hot water circuit (22).
And a blower (19) for blowing the conditioned air, and when the target blown air temperature into the room is lower than a predetermined temperature, the capacity of the refrigeration cycle (2) is varied to change the brine circuit (1).
The temperature of the first air conditioning unit (13) and the second air conditioning unit (14) on the low temperature side is controlled by varying the temperature of the brine of (0), and the target blown air temperature into the room rises above the predetermined temperature. After that, the first air conditioning unit (1
In 3), the heating amount of the heater (17) is controlled to control the temperature on the high temperature side, while in the second air conditioning unit (14), the inflow medium to the air conditioning heat exchanger (18) is transferred to the brine. The temperature control on the high temperature side is performed by switching between the brine of the circuit (10) and the hot water of the hot water circuit (22) and adjusting the flow rate of the inflow medium.

According to the above technical means, since the refrigeration cycle (2) using the combustible gas as the refrigerant can be installed outdoors, there is no risk of the combustible gas leaking into the room. Moreover, in the temperature control on the low temperature side, since the temperature of the brine in the brine circuit (10) is changed by changing the capacity of the refrigeration cycle (2), the method of cooling the brine to a low temperature around 0 ° C. is always adopted. In comparison, the energy consumption of the refrigeration cycle (2) can be reduced by the amount of changing (increasing) the temperature of the brine.

Further, in the first air conditioning unit (13),
Control of the temperature of the brine flowing into the cooler 15 and the heater (1
By combining with the heating amount control of 7), it is possible to satisfactorily control the room temperature from the low temperature range (cooling side) to the high temperature range (heating side), while the second air conditioning unit (14) also serves as both cooling and heating. By controlling the temperature of the brine flowing into the air conditioning heat exchanger (18), introducing and switching the brine and hot water, and controlling the flow rate of the brine and hot water, the low temperature region (cooling side) to the high temperature region (heating side) It is possible to control the room temperature satisfactorily. In particular, the second air conditioning unit (14) can control a wide temperature range by using only one air conditioning heat exchanger (18) for both cooling and heating, and has a simple structure.

Further, according to the invention of claim 4, the humidity detecting means (31) for detecting the humidity in the room is provided, and the dehumidification limit temperature determined according to the humidity detected by the humidity detecting means (31) is provided as the predetermined temperature. When the temperature is set and the temperature control on the high temperature side is performed, the capacity of the refrigeration cycle (2) is controlled so that the temperature of the cooler 15 is maintained at the dehumidification limit temperature.

As described above, by maintaining the temperature of the cooler 15 at the dehumidifying limit temperature even when the temperature control on the high temperature side is performed, the necessary minimum dehumidifying capacity can be ensured, and the window glass becomes cloudy. It is possible to prevent the occurrence of such problems .

The reference numerals in parentheses of the above-mentioned means indicate the correspondence with the concrete means described in the embodiments described later.

[0013]

1 to 5 show an embodiment in which the present invention is applied to a vehicle air conditioner, and FIG. 1 is a schematic plan layout view of an automobile showing a state in which the air conditioner of the present invention is mounted. Is. A running engine 9 is mounted under the floor of a vehicle compartment of an automobile to form an engine room 1. A refrigeration cycle 2 using a combustible gas such as propane gas as a refrigerant is installed in the engine room 1 under the floor.

The refrigeration cycle 2 comprises a compressor 3 for compressing and discharging the refrigerant, and the gas refrigerant discharged from the compressor 3 is cooled and condensed by a condenser 4. The refrigerant from the condenser 4 is stored in the liquid receiver 5, where the gas-liquid refrigerant is separated. Next, the liquid refrigerant from the liquid receiver 5 is decompressed by the expansion valve 6 as a decompression means, and becomes a gas-liquid two-phase state. The refrigerant decompressed by the expansion valve 6 flows into the brine-refrigerant heat exchanger 7, where it absorbs heat from the brine and evaporates to cool the brine. The gas refrigerant evaporated in the heat exchanger 7 is again sucked into the compressor 3 and compressed.

The above-mentioned brine is composed of an antifreeze liquid in which a component for lowering the freezing temperature, a rust preventive component, etc. are added to water, and may be the same as the engine cooling water circulating in the hot water circuit 22 described later. 1 and 2 show the arrangement state in which the compressor 3 is separated from the vehicle engine 9, the compressor 3 is actually arranged close to the vehicle engine 9 so that the compressor 3 rotates It is driven by power through the electromagnetic clutch 8 (FIG. 2).

The brine-refrigerant heat exchanger 7 has a refrigerant passage portion 7a through which the refrigerant of the refrigeration cycle passes and evaporates, and a brine passage portion 7b disposed so as to exchange heat with the refrigerant passage portion 7a. Have Next, the brine circuit 10 in which the brine cooled in the brine-refrigerant heat exchanger 7 circulates will be described. In this brine circuit 10, an electric water pump 11 for brine circulation is provided in the engine room 1 as a brine. It is installed adjacent to the refrigerant heat exchanger 7.

On the other hand, a front air conditioning unit (first air conditioning unit) 13 is installed around the instrument panel in the front of the vehicle compartment of the automobile, and a rear air conditioning unit 14 is installed in the rear portion of the vehicle interior. The front air conditioning unit 13 includes a brine circuit 10
Cooler 15 for cooling air with low-temperature brine (cold water) circulating through air, electric type blower 16 and heater 17
And the heater 17 is installed downstream of the cooler 15 in the air flow. This heater 17 is the engine 9
The air is reheated using the cooling water (warm water) as a heat source, and the conditioned air is blown to the front side (first area) in the vehicle compartment after passing through the heater 17 and the temperature thereof being adjusted.

The rear air conditioning unit 14 is provided with an air conditioning heat exchanger 18 for both cooling and heating. The air conditioning heat exchanger 18 cools air by inflowing low temperature brine circulating in the brine circuit 10, and in the brine circuit 10, the front air conditioning unit 13 is cooled.
It is provided in parallel with the cooler 15. In addition, an electric blower 19 is installed in the rear air conditioning unit 14,
The blown air exchanges heat with the air conditioning heat exchanger 18 to be cooled or heated, and then blown out to the rear side of the passenger compartment.

Since the air conditioning heat exchanger 18 is for both cooling and heating, the cold / hot water switching valve 20 is connected to the air conditioning heat exchanger 1.
8 is installed on the cold / hot water inlet side so that the switching valve 20 can switch and introduce the engine cooling water (hot water) from the hot water circuit 22 and the low temperature brine from the brine circuit 10 into the air conditioning heat exchanger 18. There is. Therefore, the air conditioning heat exchanger 18 is provided with a common passage portion 18a for flowing both hot water and brine, and the hot water circuit 22 on the inlet side to the air conditioning heat exchanger 18 of the common passage portion 18a is provided.
A cold / hot water switching valve 20 is arranged at a confluence point between the above and the brine circuit 10.

The cold / hot water switching valve 20 is driven to open / close by an electric actuator such as a motor. In this example, a valve body (rotor) having a flow path 20a bent at right angles as shown in FIG. 2 is used. ) 20b is rotated to switch the flow path, and the flow rates of the hot water and the low temperature brine can be adjusted. In order to exert this flow rate adjusting action, as shown in the cross-sectional shape of the flow path 20a in the valve body 20b at the time of maximum cooling in FIG. 2 (b), a circular large area is formed along the circumferential direction of the outer peripheral surface of the valve body 20b. The portion 20c and the elongated small area portion 20d are connected to each other.

Next, the hot water circuit 22 for circulating the engine cooling water will be described. The vehicle engine 9 is of a water cooling type and also serves as a hot water source. The vehicle engine 9 includes a water pump 23 directly driven by the water pump 23. The water pump 23 includes a radiator 24 for circulating engine cooling water, and a bypass circuit 25 provided in parallel with the radiator 24.

Further, the radiator 24 and the bypass circuit 2
A well-known thermostat (temperature response valve) 26 for switching the flow of the cooling water is provided at the confluence point of the cooling water from and 5, and the temperature of the cooling water is a predetermined temperature (for example, 80 ° C).
If it becomes above, the thermostat 26 will open the flow path to the radiator 24, and the engine cooling water will be cooled by the radiator 24. Further, in the front air conditioning unit 13, on the cooling water inlet side of the heater 17, an electric on-off valve 28 that connects and disconnects the cooling water to the heater 17 is provided.

A well-known air mix door 29 is provided in the ventilation passage of the front air conditioning unit 13 for adjusting the air flow rate ratio between the warm air passing through the heater 17 and the cold air bypassing the heater 17. There is. The air mix door 29 serves as a heating amount control means (temperature control means) for controlling the heating amount of the air that has passed through the cooler 15 and adjusting the temperature of the air blown into the vehicle compartment. It is driven to open and close by a simple electric actuator.

FIG. 3 is an electric control block diagram. The air-conditioning electronic control unit 30 is composed of a microcomputer, receives signals from a sensor or the like, which will be described later, and performs arithmetic processing based on the input signals to perform the above-mentioned operation. The operation of each of the air conditioners (8, 11, 16, 19, 20, 28, 29) is controlled. The humidity sensor 31 is installed around the instrument panel in the front part of the passenger compartment and detects the humidity St in the front part of the passenger compartment. The cooler temperature sensor 32 is installed in the air passage immediately after the cooler 15, and has an air temperature T immediately after the cooler 15.
e is detected. Heater blown air temperature sensor 3
3 is installed in the air passage immediately after the heater 17, and detects the air temperature Ta immediately after the heater 17.

The temperature setter 34 at the front of the passenger compartment is provided on an air conditioning operation panel (not shown) installed around the instrument panel of the passenger compartment, and sets the set temperature Tsetf at the front of the passenger compartment. The temperature setter 35 at the rear of the passenger compartment is provided on the air conditioning operation panel or the air conditioning operation panel (not shown) installed on the outer surface of the case of the rear air conditioning unit 14 to set the set temperature Tsetr at the rear of the passenger compartment. To do.

The air conditioning heat exchanger blown air temperature sensor 36 is
It is installed in the air passage immediately after the air conditioning heat exchanger 18, and detects the air temperature Th immediately after the air conditioning heat exchanger 18.
The outside air temperature sensor 37, the inside air temperature sensor 38, and the solar radiation amount sensor 39 are well-known sensors that detect the outside air temperature Tam, the inside air temperature (vehicle interior temperature) Tr, and the solar radiation amount Ts, respectively.

Next, the operation of the above structure will be described.
Now, when the automatic operation state of the air conditioner is set by the switch operation on the air conditioning operation panel, the automatic control process of the air conditioner is started at step 100 in the flowchart of FIG. In the next step 101, signals from various sensors shown in FIG. 3 are read. In the next step 102, the target blown air temperature T of the air blown toward the front side of the vehicle compartment
AO _F and the target air temperature TAO _R of the air blown toward the rear of the passenger compartment are calculated by the following mathematical formulas 1 and 2.

[0028]

[Equation 1] TAO _F = Kset x Tsetf-Kr x Tr-Kam x Tam-K
s x Ts + C

[0029]

[Equation 2] TAO _R = Kset x Tsetr-Kr x Tr-Kam x Tam-K
s × Ts + C (However, in the above formulas 1 and 2, Kset: temperature setting gain, Kr: inside air temperature gain, Kam: outside air temperature gain, Ks:
Insolation gain, C: correction constant) In the next step 103, the dehumidification limit temperature To is set based on the humidity St on the front side of the passenger compartment detected by the humidity sensor 31. Here, the dehumidification limit temperature To is set in order to ensure the minimum necessary dehumidification capacity of the cooler 15 of the front air conditioning unit 13. If the dehumidification capacity of the cooler 15 is insufficient, the vehicle interior humidity St increases. This causes a problem that the window glass of the vehicle becomes cloudy.

The dehumidification limit temperature To is specifically the humidity S
It is set in a relationship inversely proportional to t. That is, the dehumidification limit temperature To is set to decrease as the humidity St increases. In the next step 104, vehicle target outlet air temperature TAO _F of interior front side is determined lower than or dehumidifying limit temperature To, when the determination is YES, the next step 10
At 5, the cooler 15 air temperature Te following it so that the target outlet air temperature TAO _F, capacity of the refrigeration cycle 2 is controlled.

That is, when the air temperature Te becomes lower than the target blown air temperature TAO _F , the electromagnetic clutch 8 of the compressor 3
The power supply to the compressor 3 is cut off and the compressor 3 is stopped. Conversely, when the air temperature Te is higher than the target blown-air temperature TAO _F, by energizing the electromagnetic clutch 8 of the compressor 3, to operate the compressor 3. In this way, by intermittently operating the compressor 3, the capacity of the refrigeration cycle 2 is controlled, and as a result, the temperature of the brine in the brine circuit 10 changes and the air temperature T
e is controlled.

Then, in the next step 106, the air mix door 29 is operated to the maximum cooling position (the position where the ventilation passage to the heater 17 is fully closed and the bypass passage to the heater 17 is fully opened). At the same time, the on-off valve 28 is closed and the inflow of hot water to the heater 17 is shut off. As a result, since the heating amount is zero by the heater 17, after the air-conditioned air blown by the blower 16 is cooled so that the target outlet air temperature TAO _F at the cooler 15, again by the heater 17 The air is blown to the front side of the passenger compartment at the same temperature without being heated, and air conditioning is performed on the front side of the passenger compartment.

At the next step 107, the air temperature Th immediately after the air conditioning heat exchanger 18 of the rear air conditioning unit 14 is the target blown air temperature TAO _{R of the} air blown to the rear side of the passenger compartment.
The rotation angle (opening degree) of the cold / hot water switching valve 20 is controlled so that That is, the cold / hot water switching valve 20 can switch the brine (cold water) and hot water and adjust the flow rate by adjusting the rotation angle thereof, as shown in FIG. 2B. The air temperature Th immediately after the air conditioning heat exchanger 18 can be controlled by the water switching action and the flow rate adjusting action.

However, the target blown air temperature T on the front side of the passenger compartment is
When AO _F is less than the limit temperature To dehumidification, for changing the temperature of the brine is at capacity control of the refrigerating cycle 2 as described above, maintaining the cold water switching valve 20 to the maximum cooling position shown in FIG. 2 (b) the right end even if the temperature of the flowing brine to the air conditioning heat exchanger 18 changes with changes in the TAO _F. Therefore, the air temperature Th immediately after the air conditioning heat exchanger 18 can be basically changed by the temperature change of the inflow brine to control the temperature (see FIG. 5C).

By the way, the target outlet air temperature TAO _F dehumidifying limit temperature To is smaller than the area of the vehicle interior front side, i.e., the temperature control area of the low temperature side, as shown in FIG. 5 (a), the air mixing door 29 While maintaining the maximum cooling position, the temperature of the brine in the brine circuit 10 is varied to control the air temperature Te immediately after the cooler 15 and the air temperature Th immediately after the air conditioning heat exchanger 18 to blow out into the vehicle interior. The temperature can be controlled.

Therefore, as the target air temperature TAO _F on the front side of the vehicle interior increases toward the dehumidification limit temperature To, the stop period of the compressor 3 in the refrigeration cycle 2 becomes longer (the operating rate of the compressor 3 is Decrease), refrigeration cycle 2
Energy consumption can be reduced. In the rear air conditioning unit 14, as shown in FIG. 5 (c), the flow rate of the brine is maintained at the maximum flow rate state, and the temperature change of the brine flowing into the air conditioning heat exchanger 18 causes a change immediately after the air conditioning heat exchanger 18. When the air temperature Th is controlled, the air temperature Th cannot be controlled so as to reach the target air temperature TAO _R on the rear side only by changing the temperature of the inflow brine (for example, the set temperature of the front part of the vehicle compartment). (For example, when the set temperature Tsetr in the rear part of the vehicle compartment is considerably different from Tsetf)
The flow rate of the inflow brine may be adjusted by the cold / hot water switching valve 20.

Next, in step 104, the target air temperature TAO _F on the front side of the vehicle compartment is determined to be the dehumidification limit temperature To.
When it is higher, the routine proceeds to step 108, where the capacity of the refrigeration cycle 2 is controlled so that the air temperature Te immediately after the cooler 15 is maintained at the dehumidification limit temperature To. That is, by intermittently operating the compressor 3, the capacity of the refrigeration cycle 2 is controlled so that the air temperature Te is maintained at the dehumidification limit temperature To. As a result, the minimum necessary dehumidifying capacity for preventing fogging of the window glass by the cooler 15 can be secured, and the fogging of the window glass can be prevented in advance.

[0038] As air temperature Ta immediately after the heater 17 in the next step 109 becomes the target outlet air temperature TAO _F of the front side, adjusts the opening degree of the air mixing door 29. That is, as shown in FIGS. 5A and 5B, the heating amount of the heater 17 is adjusted by adjusting the opening degree of the air mix door 29, and the air temperature Ta immediately after the heater 17 is controlled. Thereby, the temperature control of the high temperature side of the front air conditioning unit 13 is performed. The on-off valve 28 is opened when the air mix door 29 is at a position other than the maximum cooling position,
Hot water circulates in the heater 17 of the front air conditioning unit 13.

At the next step 110, the rotation angle of the cold / hot water switching valve 20 is adjusted so that the air temperature Th immediately after the air conditioning heat exchanger 18 of the rear air conditioning unit 14 becomes the target air temperature TAO _R on the rear side. Controlled. This step 110
As shown in FIG. 5 (c), the control by the first is to rotate the valve body 20 b of the hot / cold water switching valve 20 counterclockwise from the maximum cooling position at the right end of FIG. The air temperature T immediately after the air conditioning heat exchanger 18 is reduced.
raise h.

Then, the target blown air temperature TAO on the rear side
_{When R} reaches a temperature that matches the outside air temperature Tam, the valve body 20b of the cold / hot water switching valve 20 is rotated to the center position of FIG. 2 (b), and the cold / hot water switching valve 20 is closed (closed). The inlet side of the shared passage portion 18a of the heat exchanger 18 is shut off from both the brine circuit 10 and the hot water circuit 22. When the target air temperature TAO _R on the rear side becomes higher than the outside air temperature Tam, the valve body 20b of the cold / hot water switching valve 20 is further rotated counterclockwise from the closed position of the center of FIG. The common passage portion 18a inlet side of the container 18 is connected to the hot water circuit 22. As a result, hot water begins to flow into the air conditioning heat exchanger 18, and the flow rate of this hot water is increased as TAO _R rises, so that the air temperature Th immediately after the air conditioning heat exchanger 18 is increased.
Can be controlled so as to become the target air temperature TAO _R on the rear side.

The brine outlet side (upper end side in FIG. 1) of the air conditioning heat exchanger 18 of the rear air conditioning unit 14 is always connected to the hot water circuit 22.
2 does not flow to the air conditioning heat exchanger 18, and since the air conditioning heat exchanger 18 is connected to the hot water circuit 22 by a long hot water pipe, heat conduction from the hot water circuit 22 causes air conditioning heat exchanger 18 to flow. There is no fear that the temperature will rise.

When it is not necessary to air-condition the rear side of the passenger compartment, the blower 19 of the rear air conditioning unit 14 may be stopped. Further, as can be understood from the above description of the operation, the means for calculating the target blown air temperature in claim 3 is configured in step 102, and the dehumidification limit temperature (predetermined temperature) is set.
The setting means for To is configured in step 103, the determination means for determining the magnitude of the target indoor air temperature and the dehumidification limit temperature is configured in step 104, and the control means is configured in steps 105-110. ing. Further, the humidity detecting means in claim 4 is composed of a humidity sensor 31. (Other Embodiments) In the above embodiment, an air mixing door 29 is provided in the air passage of the front air conditioning unit 13 to adjust the air volume ratio of cold air and warm air to adjust the blown air temperature. The open / close valve 2
8 may be configured as a flow rate control valve for controlling the flow rate of hot water, and the hot water flow rate adjusting method may be used in which the amount of hot water to the heater 17 is adjusted by the opening degree of the flow rate control valve to adjust the blown air temperature.

In the above embodiment, the refrigeration cycle 2 is used.
In order to control the capacity of the compressor 3, a method of intermittently energizing the electromagnetic clutch 8 of the compressor 3 to intermittently operate the compressor 3 is adopted. In other words, the combination of the compressor 3 and the electromagnetic clutch 8 is used as the capacity varying means of the refrigeration cycle 2, but the invention is not limited to this method, and for example, a variable capacity type compressor 3 is used, and the compressor 3 Capacity control device 30
By electrically controlling according to the control signal from
The capacity of the refrigeration cycle 2 may be controlled.

In the above embodiment, the case where the compressor 3 is driven by the vehicle running engine 9 has been described.
In an electric vehicle or the like, the compressor 3 may be an electric type driven by a motor. In this case, the electric compressor is configured to be able to control the rotation speed by an inverter, the inverter current is controlled according to a control signal from the control device 30, and the compressor rotation speed is electrically controlled, whereby the refrigeration cycle 2
May be controlled.

Further, in a hybrid vehicle having both an engine and a motor as a driving prime mover, or an electric vehicle having only a motor as a driving prime mover and no engine, a hot water circuit 22 and a heater 17 are provided. The present invention can be similarly implemented by additionally installing an electric water pump that circulates hot water. Further, the present invention can be applied to a brine type air conditioner in which only the air conditioning unit 13 on the front side is installed in the vehicle compartment and the air conditioning unit 14 on the rear side is not provided. Furthermore, the present invention can be similarly implemented in applications other than those for vehicles.

[Brief description of drawings]

FIG. 1 is a schematic plan layout view of a vehicle showing an embodiment of the present invention.

FIG. 2A is a circuit diagram of a refrigeration cycle, a hot water circuit, and a brine circuit of the above embodiment, and FIG. 2B is an operation explanatory view of the cold / hot water switching valve shown in FIG.

FIG. 3 is an electrical control system diagram of the above embodiment.

FIG. 4 is a flowchart for explaining the operation of the above embodiment.

FIG. 5 is a graph for explaining the operation of the above embodiment.

[Explanation of symbols]

1 ... Engine room, 2 ... Refrigeration cycle, 3 ... Compressor,
4 ... Condenser, 6 ... Expansion valve, 7 ... Brine-refrigerant heat exchanger, 9 ... Vehicle engine, 10 ... Brine circuit, 13 ... Front air conditioning unit, 14 ... Rear air conditioning unit, 15 ... Cooler, 16, 19 ... Blower, 17 ... Heater, 18 ... Air conditioning heat exchanger, 18a ... Common passage section, 20 ... Cold / hot water switching valve, 2
2 ... Hot water circuit.

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B60H 1/32

Claims (5)

(57) [Claims] 1. A refrigeration cycle (2) in which a flammable gas is circulated as a refrigerant and a brine-refrigerant heat exchanger (7) absorbs the refrigerant from the brine to evaporate, and the brine-refrigerant heat exchanger ( A brine circuit (10) in which the brine cooled in 7) circulates, a hot water circuit (22) in which hot water heated by a hot water source (9) circulates, and a first air conditioner for air conditioning the first area in the room. Unit (13)
And a second air conditioning unit (14) for air conditioning the second area in the room
A cooler (15) provided in the first air conditioning unit (13) for cooling the conditioned air by the brine of the brine circuit (10); and a cooler (1) in the first air conditioning unit (13).
5) A heater (17) arranged downstream of the air to heat the conditioned air with the hot water of the hot water circuit (22), and a blower (fed) provided in the first air conditioning unit (13) for blowing the conditioned air ( 16) and the second air conditioning unit (14), the conditioned air can be cooled by the brine of the brine circuit (10) and the conditioned air can be heated by the hot water of the hot water circuit (22). An air conditioning heat exchanger (18) for both cooling and heating and a blower (19) provided in the second air conditioning unit (14) for blowing conditioned air are provided, and the target blown air temperature into the room is a predetermined temperature. When the temperature is lower, the capacity of the refrigeration cycle (2) is changed to change the temperature of the brine in the brine circuit (10) to thereby change the temperature of the first air conditioning unit (13) and the second air conditioner. After the temperature control on the low temperature side of the air conditioning unit (14) is performed and the target blown air temperature into the room rises above the predetermined temperature, the first air conditioning unit (13) turns on the heater (17). The heating amount is controlled to control the temperature on the high temperature side, while in the second air conditioning unit (14), the medium flowing into the air conditioning heat exchanger (18) is fed to the brine of the brine circuit (10) and the hot water. A brine type air conditioner characterized by performing switching between hot water in the circuit (22) and adjusting the flow rate of the inflow medium to control the temperature on the high temperature side. 2. A refrigeration cycle (2) in which a flammable gas is circulated as a refrigerant, and the brine-refrigerant heat exchanger (7) absorbs the refrigerant from the brine to evaporate, and the brine-refrigerant heat exchanger ( A brine circuit (10) in which the brine cooled in 7) circulates, a hot water circuit (22) in which hot water heated by a hot water source (9) circulates, and a first air conditioner for air conditioning the first area in the room. Unit (13)
And a second air conditioning unit (14) for air conditioning the second area in the room
A cooler (15) provided in the first air conditioning unit (13) for cooling the conditioned air by the brine of the brine circuit (10); and a cooler (1) in the first air conditioning unit (13).
5) A heater (17) which is arranged on the downstream side of the air and heats the conditioned air by the hot water of the hot water circuit (22); and a blower which is provided in the first air conditioning unit (13) and blows the conditioned air. (16) and the second air conditioning unit (14), the air conditioning air can be cooled by the brine of the brine circuit (10) and the air conditioning air can be heated by the hot water of the hot water circuit (22). Air-conditioning heat exchanger (18) for both cooling and heating, a blower (19) provided in the second air-conditioning unit (14) for blowing conditioned air, and the refrigeration cycle (2) with variable capacity. A capacity varying means (3, 8) for varying the temperature of the brine of the brine circuit (10), a heating amount control means (29) for controlling the heating amount by the heater (17), and the air conditioning heat exchanger ( The inflow medium to 8) is switched between the brine of the brine circuit (10) and the hot water of the hot water circuit (22), and a valve means (20) capable of adjusting the flow rate of the inflow medium is provided. When the target blown air temperature to the air conditioner is lower than a predetermined temperature, the capacity of the refrigeration cycle (2) is changed by the capacity changing means (3, 8), and the brine circuit (10) is changed.
By varying the temperature of the brine, the first air conditioning unit (13) and the second air conditioning unit (14)
Temperature control on the low temperature side, and after the target outlet air temperature into the room rises to the predetermined temperature, the heating amount control means (29) controls the high temperature side temperature in the first air conditioning unit (13). On the other hand, in the second air conditioning unit (14), the temperature control on the high temperature side is performed by the valve means (20). 3. A calculation means (102) for calculating a target blown air temperature into the room, a setting means (103) for setting the predetermined temperature, and a target blown air temperature into the room and the predetermined temperature. A determination means (104) for determining the magnitude and a temperature control on the low temperature side are performed while the target blown air temperature into the room is lower than the predetermined temperature, and the target blown air temperature into the room reaches the predetermined temperature. The brine type air conditioner according to claim 1 or 2, further comprising: a control unit (105 to 110) that controls the temperature on the high temperature side after the temperature rises. 4. A humidity detecting means (31) for detecting humidity in a room air-conditioned by the first air conditioning unit (13) and the second air conditioning unit (14), and the setting means (103) is As the predetermined temperature, a dehumidification limit temperature that is determined according to the humidity detected by the humidity detecting means (31) is set, and the control means (105 to 110) performs the temperature control on the high temperature side when the cooler 15 is used. The brine type air conditioner according to claim 3, wherein the capacity of the refrigeration cycle (2) is controlled so that the temperature of the above is maintained at the dehumidification limit temperature. 5. The brine type air conditioner according to any one of claims 1 to 4 is configured to be mounted on a vehicle, and the first air conditioning unit (13) is arranged in a front part of a vehicle compartment to The second air conditioning unit (14) is arranged in the rear part of the vehicle compartment to air-condition the rear part of the vehicle compartment, and the hot water source is the A brine type air conditioner characterized by being an engine (9).