JPS6011068A - Automatic operation control method of air conditioner utilizing engine drive type heat pump - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

The present invention relates to an automatic operation control method for a heat pump in which a refrigerant compressor is driven by an engine, and an air conditioner that heats or cools a circulating heat medium liquid for air conditioning to perform heating or cooling. In the dynamic operation control method for the engine-driven heat pump, the engine is rotated at full speed until the room temperature in the air-conditioned room rises or falls to the set temperature after the R beat of operation. When this occurs, the temperature of the circulating heat medium liquid returning to the heat pump rises or falls too much in proportion to the rise or fall of the room temperature, and even if the engine is running at full speed, the temperature of the circulating heat medium liquid returned to the heat pump increases or falls too much. Because the heating or cooling capacity is low, the room temperature in the room to be adjusted is very poor during start-up operation until the temperature rises or falls to the set temperature, resulting in high fuel consumption and high running costs. The purpose of the Wooden Box 0 Kano is to eliminate such drawbacks of the conventional method.To achieve the above purpose, a two-scale device using an engine-driven heat pump was invented by Wooden Box O. The feature of this automatic operation control method is that after the start of operation, until the room temperature of the air-conditioned room rises or falls to the set temperature, the temperature of the circulating heat medium liquid heated or cooled via the engine-driven heat pump remains constant. When the upper limit value or the lower limit value of the set range is reached, the engine in the heat pump is automatically switched to an idling operating state, and the temperature of the circulating heat medium liquid reaches the lower limit value or the upper limit value of the set range. The engine is equipped with a control means for automatically switching the engine to a full-speed rotation operating state when the engine is running at full speed. Because the temperature of the liquid can be maintained within the set range,
By appropriately determining the above setting range according to the air conditioning conditions, the circulating heat medium liquid can be maintained at a temperature at which the heat pump can efficiently heat or cool the heat medium liquid. Moreover,
When the temperature of the circulating heat transfer medium reaches the upper or lower limit of the setting II, do not stop the engine (with the engine at idling speed, the temperature of the circulating heat transfer medium should be above the temperature) or be too low. This prevents deterioration in engine durability due to repeated stopping and starting of the engine. Therefore, when the main building is completed at 0, start-up operation can be performed efficiently.
Furthermore, it has been possible to achieve the effect of improving engine durability. What is the operation control to maintain the room temperature at the set temperature after the room temperature rises to the set temperature? ! The control was based only on adjusting the engine speed based on the load balance, but in this case, the engine speed adjustment range was the heat pump capacity adjustment range, and the engine speed was controlled in terms of thermal efficiency, fuel efficiency, etc. Even if the adjustment range cannot be increased further, if the air conditioning load drops to a certain level, the engine will immediately stop working, and the engine will start and stop frequently at light loads, which will shorten the engine's lifespan. It had the disadvantage of being short. The purpose of Taichi ■ Hatsuo is to eliminate such conventional shortcomings, and this book g/! was taken to achieve that purpose. I
The characteristic configuration of the automatic operation control method of the engine-driven heat pump-based hotpot device by O Hao is that, in the configuration for achieving the first objective, the room temperature t-setting after the room temperature rises to the set negative degree; Automatic control means to maintain the temperature
The present invention is based on a combination of automatic control of the engine rotational speed and automatic control of the amount of refrigerant compressed by the refrigerant compressor driven by the engine. The operation of the main building 0 complete with such a characteristic structure is as follows. Since the control to maintain the room temperature at the set temperature is performed in combination with automatic control of engine speed and automatic control of the amount of compressed refrigerant, the engine speed is lower than when automatic control of engine speed is performed alone. Although the adjustment range is the same,
The heating or cooling capacity of the heat pump can be adjusted over a wider range. Therefore, the present invention has achieved the effect of extending the life of the engine by reducing the number of times the engine starts and stops while maintaining good thermal efficiency and fuel efficiency. Hereinafter, embodiments of the present invention will be described based on all the drawings. First, to explain the engine-driven heat pump Ishikawa's heating system, as shown in Figure 1, the refrigerant pressure and temperature of the compressed refrigerant driven by a water-cooled diesel engine 111 are as follows. (An example of a room to be heated) Equipped with a low-resolution device (81, an expansion valve (4), and an evaporator that heats and evaporates refrigerant using a heat source such as underground water) that heats circulating water for heating. The engine-driven heat pump heats the circulating water with cooling water from the engine port. . A first heat exchanger (7) and a second heat exchanger (83 and f) for heating the circulating water with the exhaust gas of the engine 111 are provided to heat the target room (8) with the circulating water. The condenser is composed of:

[3I, first heat exchanger (7), second heat exchanger (81i, pump (9), and tank [1 The refrigerant circuit 0 in the heat pump-1 has a bypass path 04 with an on-off valve lIj that bypasses the compressor 21. teeth】
By reducing the amount of refrigerant compressed by Vc, condenser L13
It is configured to reduce the heating capacity at. (8H) and (SL) are switches that are turned ON when the temperature of the circulating water reaches the upper and lower limits of the set range, respectively.
, 01 is a sensor for detecting the rotation of the engine 11), 07+ is a starter motor, a1 is a room temperature sensor, and Ql is an operation controller. Next, based on the time chart shown in FIG. 2 and the flow chart shown in FIG.
@The method will be explained separately for starting, ramping up, operating load control operation, and stopping. (1) Determine whether or not the engine is started with the starter power switch turned on,
If so, preheat the engine IL+, operate the on-off valve 0j, and turn the speed governor - into full speed rotation? Make preparations for starting the engine, such as changing the engine and operating the fuel pump. Then, when preheating of the engine (1) is completed, the starter motor 071 is activated, and when the engine ill is activated, the starter motor 071 is stopped. If the engine (1) does not operate, the starter motor αη continues to operate 'fc until a set time has elapsed, and an alarm is issued when the set time has elapsed. When the starter motor (I7) stops, the idling switch is activated. If N, the speed governor 1 is maintained in an idling state until the set time (Tt) has elapsed. [2] Start-up operation (8) The detected room temperature (1) becomes the set temperature from the time when the idling rotation operation for the general fixed time (T1) ends, or from the time when the idling switch is determined to be OFF. (
Until the rise to η, the lower limit switch (sTJ) is set to O.
In the case of FF, or if the lower limit switch (13I,) is ON, the upper limit switch (sn) is OFF, and the speed governor side is in the full speed rotation state, the lower limit switch (III ) is ON, upper limit switch (
1! IH) is ON, or the lower limit switch (s:t,
) is 0]i, the upper limit switch (SR) is OFF, and the speed governor 0@ is not in the full speed rotation state, the speed governor is set in the idling state. Tsumashi, in this start-up operation (8). When the circulating water temperature reaches the upper limit of the set range due to engine running at full speed, the engine (11 is automatically switched to idling operation state and this engine port) is running at idling speed. When the circulating water temperature reaches the lower limit of the set range, the detected room temperature (
This is done until 1) rises to the set temperature (η. [3] For load control operation) After the detected room temperature (1) reaches the set temperature (1), the detected room temperature (1) is within the dead zone of the set temperature. Whether it is in t-1plJ
If there is a disconnection 1, continue operating the engine (11) at the current rotational speed of 010; if there is no disconnection, the detected temperature (
1) is also larger than the set temperature (1). If this judgment is large, the engine port) is decelerated; if it is small, the speed is increased. Even if the engine speed (goods) reaches the idling speed (ML), the detected room temperature (1)
If the temperature continues to drop to the set room temperature (7), open/close the valve!
131 is closed, and if it is closed, the on-off valve 11!1 is opened to continue operation, and if it is open, the engine (1) is stopped. On the other hand, even if the engine rotation speed N reaches the full speed rotation speed (liH), the detected room temperature (
1) If the temperature does not rise to the set room temperature ('11), determine whether the on-off valve is open or not, and if it is closed, continue operation and In case of sowing,
Closing valve al't- closes and continues operation. −) Masi,
In the load control operation, automatic control to maintain the room temperature t - the set temperature is performed by a combination of automatic control of the engine speed and automatic control of the amount of compressed refrigerant by opening and closing the on-off valve aS. [4] Stop (D) When it is determined that the on-off valve U is closed or not, the idling switch is set to Q.
NI decides whether to enter or not 1701! If the speed governor SVt is running, the engine (1) is maintained at idling speed for the set time (Ts) of the speed governor SVt, and after the set time (Ts) has elapsed, the fuel pump is stopped and the engine (1) is stopped. death,
When the set time ('I'm) elapses after this engine stops, the pump 191 ventilation fan, etc. is stopped. On the other hand, if the idling switch is OFF, check whether the stop switch is ON or not. Decide if it is and turn it on.
In this case, the engine Til is stopped. In addition, although the above example shows the case of heating, it is not completely completed.
Of course, l can also be applied to cooling. Also, pressure m machine l! ] In addition to the embodiment means, the means for controlling the amount of refrigerant compressed by the compressor I! Examples include means for adjusting the operating compressors 12]'#c by connecting them in parallel, and means for selectively operating compressors of different capacities.

[Brief explanation of the drawing]

The drawings show an embodiment of the automatic operation control method for an engine-driven heat pump-based winter oil system according to the present invention, in which Fig. 1 is an air conditioning circuit diagram, Fig. 2 is a time chart showing changes in engine speed, and Fig. 3 is a diagram showing an air conditioning circuit diagram. is a flowchart. fR)... 4-control room, 161... engine-driven heat pump, (1)... engine

Claims (1)

[Claims] 0 After the start of operation, until the room temperature of the air-conditioned room (RJ) rises or falls to the set temperature, a circulating heat medium that is heated or cooled via an engine-driven heat pump (61) is used. When the temperature of the liquid reaches the upper limit or lower limit of the set range, the engine lll' in the heat pump +111
t-Automatically switches the engine (1) to an idling operating state, and when the temperature of the circulating heat medium reaches the lower limit or upper limit of the set range, automatically switches the engine (1) to a full speed operating state; A method for controlling automatic operation of an air conditioner using an engine-driven heat pump, which includes a control means. ■ The above-mentioned start-up) control means operates the air-conditioned room (
9) Until the room temperature rises or falls to the set temperature,
When the temperature of the circulating heat medium liquid heated or cooled via the engine-driven heat pump 1B+ reaches the upper limit or lower limit of the set range, the engine 11) in the heat pump 161K is automatically switched to an idling operating state. and, when the circulation temperature reaches the lower limit value or the upper limit value of the set range, the engine-driven heat pump is equipped with a control means that changes the engine to a full speed rotation operating state. An automatic operation control method for an air conditioner, the method comprising: after the room temperature rises to a set temperature;
The automatic control means for maintaining the room temperature at a set temperature includes automatic control of the engine speed and automatic control of the amount of refrigerant compressed by the refrigerant compressor (!I) driven by the engine (11).