JPS62255751A - Engine driving type air-conditioning hot water supplying device - Google Patents

Abstract

PURPOSE:To improve a rate of operation of a system and an efficiency of waste-heat of an engine in an engine driving heat pump type air-conditioning hot water feeding device by a method wherein the number of revolution of a coolant heating pump is controlled in response to the number of operation of an indoor unit and a set temperature. CONSTITUTION:An outdoor system controller 16 determines an operation mode together with a communicated signal from indoor controllers 10-12 and a concentrated remote controller 41. Signals corresponding to the number of operated indoor units and the set temperature are transmitted to a variable DC power supply device 69 from I/O port 67 through communication line 70. The variable DC power supply device 69 controls the number of rotation of a coolant heating pump 68 to the set value in response to the input signal. Simultaneously, I/O port 67 for the controller 16 controls a coolant heating solenoid valve 36 through a signal line 58. With this arrangement, it is possible to improve an efficiency of discharging heat of an engine and an efficiency of a system.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a heat pump type air-conditioning/heating/water supply device using an engine as a driving source.

[Conventional technology]

In recent years, with the diversification of energy, for example, natural gas,
2. Description of the Related Art Various engine-driven heat pump type air-conditioning and hot-water supply systems using gasoline, light oil, etc. as fuel have been proposed, including Japanese Patent Application Laid-Open No. 58-164970 and Japanese Patent Application Laid-open No. 58-179781. Fig. 3 is a configuration diagram of a conventional engine-driven beat pump type air-conditioning/heating/water heating system with three units connected as indoor units.Hereinafter, based on Fig. 3, the configuration of a conventional heat pump type air-conditioning/heating/water heating system will be explained. and explain the simple operation.

First, the compressor 2 of the refrigerant circuit driven by the engine 1
is continued by engine 1 and clutch 3. The indoor units 4, 5.6 have heat exchangers 7, 8.9 and indoor controllers io, xi, respectively.

12, and each indoor unit 4, 5゜6 connects to the outdoor system controller 1 through 8 wires 13, 14, 15.
Communicating with 6. The outdoor unit is equipped with a throttle device 17 such as an expansion valve. An outdoor heat exchanger 18 and the like are provided, and these are sequentially connected by refrigerant piping to form the refrigerant circuit constituting a refrigeration cycle, and a refrigerant circuit is provided between the compressor 2 and the indoor/outdoor heat exchanger. Cooling or heating is performed by switching the refrigerant circuit with the four-way switching valve 19 and using the indoor/outdoor heat exchanger as a condenser for heat radiation or an evaporator for heat absorption. In addition, a solenoid valve 20 provided on the outdoor side,
By controlling the flow of refrigerant through 21, 22, 23, 24° 25, the heating and cooling operation of each indoor unit 4, 5.6 is controlled, and the solenoid valve 26 is opened and closed and the heat exchanger 27 is turned off.
A heat pump hot water supply operation is being carried out.

In addition to the above configuration, a hot water storage tank 28 is provided separately.
A water supply pipe 29 is connected to the lower part thereof, and a hot water supply pipe 30 is drawn out from one part, so that hot water can be supplied from a hot water supply port 31 as appropriate. Inside the hot water storage tank 28 is a cooling water circuit that cools the hot water and recovers the exhaust heat by being circulated and supplied to the exhaust heat recovery heat exchanger 32 attached to the exhaust pipe side of the engine 1. A hot water storage heat exchanger 33, which constitutes a part of the tank, is provided. This cooling water circuit includes a reservoir tank 34 and a cooling water circulation pump 35.
The hot water supply system is configured such that hot water can be supplied by heating the water in the hot water storage tank 28 with the heat generated by the operation of one engine and turning it into hot water. In addition, solenoid valve 3
6 and operation of the refrigerant heating pump 37, the refrigerant is circulated and heated to the refrigerant heating heat exchanger 38 disposed in the cooling water circuit for exhaust heat recovery of the engine 1, and the refrigerant heating operation during heating is performed. I'm trying to do it.

Furthermore, a display device 39 for displaying the temperature of the tank 28;
A central remote controller 41, which includes an operation mode switch 40 for inputting the operation mode of the entire system, is connected to the system controller 16 through a communication line 42, and data is sent and received through this communication line 42.

The system controller 16 determines the operation based on the operation mode signal from the central remote controller 41 and the operation command from the indoor unit 7.8.9 and executes the operation, but the temperature information necessary for operation control is sent to the temperature sensor 43.44. 45 to ensure optimal system operation. Moreover, the signal line 46,
47.48 connects the temperature sensors 43, 44.45 and the system controller 16, and signal lines 49, 50.51°5
2.53, 54, 55.56 are respectively % magnetic valve 26,
20. 21. 22. 23. 24. 25°3
6, and the cooling water circulation pump 35 is connected to the signal line 57.
The refrigerant heating pump 37 and the system controller 16 are connected by a signal line 58.

As described above, the system controller 16 performs three-room multi-operation based on the operation mode signal from the central remote controller 41 and the operation commands from each indoor unit 7, 8, and 9, controls the drive of the engine 1, etc., and performs the cooling, heating, and hot water supply operations. Is going. At this time, the rotation speed of the engine 1 is controlled by the operating number of the indoor units 7.8.9 and the desired set temperature, and the amount of exhaust heat from the engine 1 changes depending on the operating state.

(Problems to be Solved by the Invention) The conventional engine-driven air-conditioning/heating/hot-water supply system is configured as described above, and since the rotation speed of the refrigerant heating pump 27 is fixed at a constant level, 1. Unable to control the flow rate of refrigerant, indoor unit 7.8 compared to the exhaust heat amount of engine 1
．． There is a problem that when the number of indoor units 7.8.9 in operation is small, the refrigerant flow rate is large, and when the number of operating units is large, the refrigerant flow rate is small. When the number of refrigerants is small, the discharge pressure of the refrigerant increases, causing a problem in that the efficiency of the system decreases.

This invention was made to solve these problems, and aims to provide an engine-driven air conditioning system that can control the flow rate of refrigerant and has good system efficiency and engine exhaust heat efficiency. .

[Means for solving the problem] A cooling water circuit and a refrigerant heating pump are provided, in which a compressor of a refrigerant circuit is driven by an engine, exhaust heat from the engine is recovered by a cooling water circulation pump, and the heat is stored in a hot water storage tank, An engine-driven air-conditioning/heating/water supply system having a plurality of indoor units having a heat exchange function is provided with a control means for controlling the rotation speed of the refrigerant heating pump according to the operating number of the indoor units and a set temperature.

(Function) The rotation speed of the refrigerant heating pump is controlled by the control means. This rotational speed is changed depending on the operating speed and set temperature of the indoor unit, and therefore the flow rate of the refrigerant changes depending on the load condition, so that efficient operation can be achieved.

[Example in Act 3] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the circuit configuration of an air-conditioning, heating, and hot-water supply apparatus according to the present invention. In the figure, parts having the same reference numerals as those in the conventional FIG. 3 are the same or corresponding components. The outdoor system controller 16 is composed of a one-chip microcomputer, and therein is an interrupt controller 60 that controls interrupt operations generated externally and internally. External oscillation path 6
A timer 62 that divides No. 18 of No. 1 to control the time, a ROM 63 that stores the system program, and this R
The configuration has the usual basic functions such as an instruction decoder 64 and ALU 65 that take out instructions from the OM 63 and decode and execute them, a ROM 66 that stores or temporarily saves data, and an output capo drawer that executes communication with the outside. elements are provided.

The indoor controller TO, 11.12 is connected to the output cupboard drawer of the controller 16 by a communication line 13.degree. 14.15, and the central remote controller 41 is also connected to the input/output cupboard drawer by a communication line 42. Communication with each module is performed by serial communication using the timer 62 and the like.

68 in the figure is a refrigerant heating pump using a voltage variable DC motor, which corresponds to the conventional pump 37 (see FIG. 3). This refrigerant heating pump 68 is a variable DC
The rotation speed of the power supply device 69 is controlled according to the output voltage of the power supply device 69, and the power supply device 69 and the input/output cupboard lower of the system controller 16 are connected to each other by a communication line 70. The system controller 16 constitutes a control means for controlling the rotation speed of the refrigerant heating pump 68 according to the operating number of indoor units and the set temperature.
The solenoid valve 36 for heating the refrigerant is controlled through the signal line 56.

Next, the operation will be explained with reference to the flowchart shown in FIG. When the subroutine shown in FIG. 2 is called from the main routine of the program described above, the output voltage of the variable DC power supply 69 as well as the solenoid valve 36 for heating the refrigerant is controlled, and the refrigerant heating pump is activated in proportion to this output voltage. 6
8 rotates to control the flow rate of the refrigerant.

Then, the operation mode is determined based on communication signals from the indoor controllers io, 11.12 and the central remote control 41, and during heating operation, refrigerant heating is controlled as follows.

That is, in the first step S1, it is determined whether the heating operation is in progress, and if not, the variable DC power supply device 69 is set so that the refrigerant heating solenoid valve 36 is closed and the refrigerant heating pump 68 is stopped after 0 rotations. (step S2), but
If the heating operation is in progress, the indoor controller 10. if.

The temperature difference between the desired room temperature set from step 12 and the current room temperature is calculated, and the load condition based on the desired room temperature is set as a temperature difference parameter (step S3). Then, the number of operating rooms (number of indoor units in operation), which is another load condition, is determined in step S4. It is determined in S5. Specifically, first, it is determined whether the operation is for one room (step S4), and if not, it is determined whether the operation is for two rooms (step S4).
5). Here, if the operation is in one room, the reference rotation speed parameter and temperature difference parameter in that case are added to determine the rotation speed of the refrigerant heating pump 68 (step S6). 3), the reference rotation speed parameter and temperature difference parameter in that case are added, and the rotation speed parameter and temperature difference parameter are added to determine the rotation speed (step 57.S8). Then, the solenoid valve 36 opens (step S9), and the refrigerant heating pump 68 is operated at the rotation speed determined as described above, thereby controlling the refrigerant flow rate during heating operation. At this time, the refrigerant heating load is adapted according to the number of operating indoor units and the desired set temperature, so it is possible to improve the problem of excessive refrigerant flow rate during single-room operation and insufficient refrigerant flow rate during three-room operation. It becomes possible to control the refrigerant flow rate to be appropriate in proportion to the exhaust heat amount of the engine.

Therefore, system efficiency and heat exhaust efficiency can be improved, and stability of refrigerant pressure can also be improved.

〔Effect of the invention〕

As explained above, according to the present invention, since the rotation speed of the refrigerant heating pump is controlled according to the operating number of the indoor unit and the set temperature, the flow rate of the refrigerant can be controlled according to the load conditions, and the system This has the effect of improving the engine efficiency and the engine exhaust heat efficiency, and also improves the stability of refrigerant pressure.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flowchart showing its operation, and FIG. 3 is a configuration diagram of a conventional engine-driven cooling/heating/water heating system. 1...Engine 2...Compressor 4.5.6...Indoor unit 7.8.9-...Heat exchanger 10.11.12. ...Indoor controller 28.
. . . Hot water storage tank 41 . . . Centralized remote control 68 .

Claims (1)

[Claims] The compressor of the refrigerant circuit is driven by the engine, and the exhaust heat from the engine is collected by the cooling water circulation pump and stored in the hot water storage tank.It is equipped with a cooling water circuit and a refrigerant heating pump, and has multiple indoor units with heat exchange functions. 1. An engine-driven air-conditioning, heating, and hot-water supply apparatus comprising: a control means for controlling the rotational speed of the refrigerant heating pump according to the operating speed and set temperature of the indoor unit.