KR20050113120A - Air conditioner driven by an engine - Google Patents

Abstract

An object of the present invention is to provide an engine driven air conditioner capable of performing air conditioning operation that promotes energy saving operation.

In addition to the normal driving means for detecting the air conditioning loads of the indoor units 2a and 2b in operation and performing the air conditioning operation in accordance with these air conditioning loads, the operating efficiency KE of the engine 10 and the operating efficiency of the compressor 11 ( It is provided with energy-saving operation means which performs air-conditioning operation at the point b which becomes the best both operation efficiency of KC), For example, the energy saving switch 45 is provided in the operation part 40, and this energy saving switch 45 is provided. ) Is operated, the air conditioner operation is performed by changing the target rotational speed to point a by the normal driving means to point b, which has the best operating efficiency (KE, KC) in both directions.

Description

Engine Driven Air Conditioning Unit {AIR CONDITIONER DRIVEN BY AN ENGINE}

The present invention relates to an engine-driven air conditioner that performs air conditioning driving so as to vary in capacity depending on the air conditioning load of each indoor unit.

The engine-driven air conditioners of the past have been constructed by connecting a compressor driven by the driving force of the engine and an outdoor unit having an outdoor heat exchanger, and one or a plurality of indoor units having an indoor heat exchanger by refrigerant piping. The air conditioning load of each indoor unit is calculated based on the temperature difference of the indoor unit detected by the indoor temperature sensor, for example, and the setting temperature set to the operation part of each indoor unit, and these air conditioning loads are outdoor The air-conditioning load of the sum total was computed by the unit, the engine was operated according to the air-conditioning load of this sum total, and air-conditioning operation was performed (for example, refer patent document 1).

[Patent Document 1] Japanese Patent Application Laid-Open No. 09-236299

However, since the engine-driven air conditioner so far performs the air conditioning operation based on the air conditioning load, the best rotation of each operation efficiency of the driving efficiency of the engine and the driving efficiency of the compressor driven by the driving force of this engine is achieved. It was not possible to perform stable operation with water, and could not perform energy-saving operation that fully utilized COP (performance factor) possessed by this engine driven air conditioner.

Therefore, this invention is made | formed in order to solve such a subject, and it is providing the engine driven air conditioning apparatus which can perform the air conditioning operation which promoted energy saving operation.

The first invention is constructed by connecting an outdoor unit having a compressor driven by a driving force of an engine and an outdoor heat exchanger, and one or a plurality of indoor units having an indoor heat exchanger by refrigerant piping, and an air conditioning load detected by the indoor unit. In the engine-driven air conditioner which performs an air conditioning operation so that the capacity | variability is variable, WHEREIN: The air conditioning load is calculated based on the temperature sensor etc. which were provided in the said indoor unit, and both the engine and a compressor are operated based on this air conditioning load. It is characterized by making the operation at the rotational speed at which the efficiency is the best.

The second invention comprises an outdoor unit having a compressor driven by a driving force of an engine and an outdoor heat exchanger, and one or a plurality of indoor units having an indoor heat exchanger connected by a refrigerant pipe, and the air conditioning load detected by the indoor unit. An engine-driven air conditioner which performs an air conditioning operation so as to have a variable capacity according to the present invention, wherein the air conditioning load is calculated based on a temperature sensor and the like provided in the indoor unit, and the engine and It is characterized by including the normal driving means for controlling the operation of the compressor and the energy saving driving means for driving the engine and the compressor at the rotational speed at which both the engine and the compressor have the best operating efficiency.

The third invention is characterized in that the normal driving means and the energy saving driving means in the second invention are driving means selected by operation of an operation unit instructing the operation of the engine driven air conditioner.

4th invention is a control part which performs the operation control of the said engine and a compressor in 2nd or 3rd invention, Comprising: It is provided with the data of the rotation speed which the both operation efficiency of the said engine and a compressor is the best, and is used for operation of the said operation part. When the energy saving operation means is selected, the engine and the compressor are operated by using data as the target rotational speed or data which is in a predetermined range based on the air conditioning load as the target rotational speed.

5th invention is a control part which performs the operation control of the said engine and a compressor in 2nd or 3rd invention, Comprising: Computing means which calculates the rotation speed which the both operation efficiency of the said engine and a compressor is the best, The said operation part When the energy saving driving means is selected by the operation of, the rotation speed at which both the driving efficiency of the engine and the compressor obtained by the calculating means is the best is set as the target rotation speed or within a predetermined range based on the air conditioning load. The engine and the compressor are operated by using the rotational speed at which both the operation efficiency of the engine and the compressor obtained by the calculation means is the best, as the target rotational speed.

In the sixth invention, the refrigerant circulated to the engine-driven air conditioner according to any one of the second to fifth inventions is an alternative refrigerant (R410A).

According to the present invention, it is possible to perform the energy saving operation which performs the air-conditioning operation at the rotation speed which has the best operation efficiency of both the engine and the compressor, and it is possible to perform the advanced energy saving, and the energy saving operation and the Since the air conditioning load of each indoor unit can be selected by the operation of an operation part of the normal air conditioning operation which performs operation, the said energy saving operation and normal operation can be selected arbitrarily. In addition, by using an alternative refrigerant (R410A) having a high volumetric capacity per unit volume and low pressure loss and allowing energy saving operation to be performed within a predetermined capacity range based on the air conditioning load, the user is not inconvenienced. The effect of energy saving operation can be further promoted.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described in detail based on drawing.

Fig. 1 is a block diagram showing an embodiment of an engine driven air conditioner 100 to which the energy saving driving means of the present invention is applied.

The engine-driven air conditioner 100 includes, for example, a unit-to-unit piping 3 comprising one outdoor unit 1 and a plurality of indoor units 2a and 2b comprising a gas pipe 3a and a liquid pipe 3b. The replacement refrigerant R410A having a high refrigerant capacity per unit volume and low pressure loss is circulated.

The outdoor unit 1 is connected to an engine 10 which generates a driving force by burning fuel such as gas, and a driving force transmission means not shown by the engine 10, and compresses and discharges the replacement refrigerant R410A. A compressor 11, a four-way valve 12 for inverting the circulation direction of the refrigerant, an outdoor heat exchanger 13 for exchanging heat between the refrigerant and the outside air, and an outdoor expansion valve 14 for depressurizing the refrigerant. ) And the accumulator 15 for separating gas-liquid separation of the refrigerant to be sucked into the compressor 11 are connected to and stored in the refrigerant pipe.

In addition, the indoor units 2a and 2b include indoor heat exchangers 20a and 20b for performing heat exchange between the indoor air and the refrigerant in the rooms where these indoor units 2a and 2b are installed, and the respective indoor units 2a and 2b. The indoor expansion valves 21a and 21b for controlling the amount of refrigerant of the introduced refrigerant are connected to and stored in the refrigerant pipe, respectively.

In addition, the engine-driven air conditioner 100 includes a control device 30 that controls the operation of the engine-driven air conditioner 100, and an operation unit that performs operations such as a driving instruction of the control device 30 ( 40). In addition, even if this operation part 40 is what is called a remote controller which performs the operation / stop of indoor unit 2a, 2b, etc., or confirms the various settings and operation states of these indoor unit 2a, 2b and outdoor unit 1, It may be a remote control device capable of performing.

When the operation of the engine driven air conditioner 100 is started from the operation unit 40, the operation of the engine 10 is instructed from the control device 30 to generate a driving force, and the compressor ( 11 is operated to compress and discharge the replacement refrigerant R410A. For example, in the case of the cooling operation, the four-way valve 12 is set in the direction of the broken arrow, and the refrigerant discharged from the compressor 11 is discharged from the four-way valve. Inflow to the outdoor heat exchanger 13 via 12, condensation by heat exchange with the outside air, decompression by the outdoor expansion valve 14, circulating the liquid pipe 3b, sorted and classified into each indoor unit 2a, Flow into 2b).

The refrigerant flowing into these indoor units 2a and 2b flows into the indoor heat exchangers 20a and 20b via the indoor expansion valves 21a and 21b, respectively, and exchanges heat with the indoor air to evaporate the gas pipe 3a. ) Flows out into the accumulator 15 through the four-way valve 12 of the outdoor unit 1, and the gas liquid is separated by the accumulator 15, and the compressor 11 Circulate in the inflowing route.

In addition, in the heating operation, the four-way valve 12 is set in the direction of the solid arrow, and the refrigerant compressed and discharged from the compressor 11 flows through the gas pipe 3a via this four-way valve 12, and is classified. It flows into the unit 2a, 2b, condenses by exchanging heat with indoor air in each indoor heat exchanger 20a, 20b, and depressurizes by the indoor expansion valve 21a, 21b, respectively, and it flows out into the liquid pipe 3b.

Thereafter, the refrigerant condensed in the indoor heat exchangers 20a and 20b joins the liquid pipe 3b and returns to the outdoor unit 1, and passes through the outdoor expansion valve 14 to the outdoor heat exchanger 13. It flows in, it heat-exchanges with outdoor air by this outdoor heat exchanger 13, and evaporates again, flows into the accumulator 15 via the four-way valve 12, and gaseous liquid is separated by this accumulator 15, and the compressor 11 is carried out. It is supposed to circulate in the inflow route to

In the engine driven air conditioner 100, an air conditioning load is calculated based on, for example, a temperature sensor provided in the indoor units 2a and 2b (not shown), and the engine 10 and the compressor 11 are used. Normal driving means for controlling the operation of the control panel), and energy saving driving means for performing the air conditioning operation at the rotational speed at which both the engine 10 and the compressor 11 have the best operating efficiency.

First, the control device 30 will be described. As shown in the block diagram of FIG. 2, the control device 30 includes various settings of the engine-driven air conditioner 100, the engine 10 and the compressor ( 11) a setting unit 31 for performing a driving instruction or the like, a ROM 32 in which a program such as an energy saving driving means of the present invention is stored, and controlling or calculating the engine driven air conditioner 100 The CPU 33, the RAM 34 which stores and stores the operation data of the outdoor unit 1 and each indoor unit 2a, 2b, and the like, and the transmission / reception unit 35 which communicates with the operation unit 40 described later It is stored.

In addition, the RAM 34 includes data of the operating efficiency KE of the engine 10 and the operating efficiency KC of the compressor 11, as shown in FIG. 3 used when performing the energy saving driving means of the present invention. Data is also included. As shown in Fig. 3, these operating efficiencies KE and KC are, for example, data indicating good and bad operation efficiencies of the engine 10 and the compressor 11 for each rotational speed. In addition, the data of the operation efficiency KE of the engine 10 and the data of the operation efficiency KC of the compressor 11 do not record each operation efficiency KE and KC together, but rather the both operation efficiency KE , KC) can be stored in the RAM 34 as data of integrated efficiency KS which are obtained collectively.

In addition, when the operation part 40 is demonstrated, for example, as shown in the front view of FIG. 4, the operation part 40 has the display part 41 which displays the operation state of this engine-driven air conditioner 100, An operation / stop switch 42 for instructing operation / stop of the engine driven air conditioner 100, an operation switching switch 43 for instructing switching of an operation mode such as cooling or heating, and each indoor unit ( The temperature setting switch 44 which sets the target room temperature (henceforth a set temperature) of 2a, 2b), the energy saving switch 45 which instructs the energy saving operation means of this invention, etc. are provided. . In addition, since the energy saving switch 45 is a switch for setting the engine 10 and the compressor 11, the energy saving switch 45 can also be provided as the setting unit 31 of the control device 30 described above.

For example, when the energy saving switch 45 performs the first operation, an energy saving mark 46 such as a * mark shown in FIG. 4 is applied to the display portion 41 of the operation portion 40, for example. When the energy saving driving means of the present invention is lit and the second operation is performed, the energy saving mark 46 or the like is turned off, and the normal driving means is executed.

The energy saving driving means of the present invention will be described below.

Before that, the normal driving means of the engine driven air conditioner 100 will be described. In this normal driving means, the operation / stop switch 41 and the temperature setting switch 44 of the operation unit 40 are operated. When operation is instructed from the operation unit 40 to the control device 30, for example, the room temperature detected by a temperature sensor (not shown) of each indoor unit 2a, 2b and the temperature setting switch 44 are instructed. Based on the temperature difference from the set temperature and the like, the respective air conditioning loads Ha and Hb of the respective indoor units 2a and 2b are calculated and summed, and the overall air conditioning load Hs is calculated. This overall air-conditioning load Hs is shown in FIG. 5 when it is shown using FIG. 3. For example, if the air-conditioning load Hs was a point, the engine 10 and the compressor will be a point a. The target rotation speed MK1 of (11) is calculated. Thereby, operation | movement is instructed from the control apparatus 30 to the engine 10 and the compressor 11 as target rotation speed, and air-conditioning operation is performed, and this operation is the conventional air conditioning It is not at all different from the normal driving means performed by the apparatus.

In contrast, in the present invention, when the energy saving switch 45 of the operation unit 40 performs the first operation, the operation efficiency (KE, KC, KS) of FIG. 3 stored in the RAM 34 of the control device 30 is reduced. From the data, the point b at which the best operating efficiency (KE, KC) of the engine 10 and the compressor 11 are best is obtained, and the point a is changed to this point b so as to be the target of the engine 10 and the compressor 11. The target rotational speed is set to operate as the rotational speed MK2 serving as the b point. This point b is the rotational speed at which both the operation efficiency KE of the engine 10 and the operation efficiency KC of the compressor 11 and the integrated efficiency KS are the best.

In addition, this energy saving driving means will be described with reference to the flowchart shown in Fig. 6, firstly determining whether the engine driven air conditioner 100 is in operation (step S1), and if not, step S1. It returns to and repeats whether this operation is being performed, and if it is running, the room temperature detected by the temperature sensor which is not shown in each indoor unit 2a, 2b shown in FIG. 1, and the setting set by the operation part 40 Based on the temperature difference with the temperature and the like, the air-conditioning loads Ha and Hb of the respective indoor units 2a and 2b are calculated to obtain the overall air-conditioning loads Hs and correspond to the air-conditioning loads Hs. The rotation speed MK1 of the engine 10 and the compressor 11 to be obtained is obtained (step S2).

Thereafter, the operation of the energy saving switch 45 of the operation unit 40 is performed to determine whether the execution of the energy saving driving means of the present invention is instructed (step S3), and the execution of the energy saving driving means is not instructed. Otherwise, determination is made as the normal driving means, and the target rotational speed MK of the engine 10 and the compressor 11 is set to the rotational speed MK1 (point a in Fig. 5) obtained from the air conditioning load Hs. An instruction is made (step S4), the engine 10 and the compressor 11 are operated at this rotation speed MK (that is, a point), and the operation according to the air conditioning load Hs is performed (step S5).

On the other hand, if the execution of the energy saving operation means is instructed in step S3, the respective operating efficiency of the engine 10 and the compressor 11 shown in Fig. 3 stored in the RAM 34 of the control device 30 ( From the data of KE and KC, the rotation speed MK2 (b point in Fig. 5) where both driving efficiency KE and KC are best together is obtained, and the rotation speed MK is set as the rotation speed MK2. An instruction is made (step S6), and the engine 10 and the compressor 11 are operated at this rotation speed MK (that is, point b) (step S7).

As a result, the engine-driven air conditioner 100 can automatically perform the air conditioning operation at the point b having the best operation efficiency KS, and at the same time, the alternative refrigerant having a high refrigerant capacity per unit volume and low pressure loss ( Since R410A) is used, the air conditioning operation which promotes energy saving can also be performed.

In addition, with this energy saving driving means, when the energy saving switch 45 of the operation unit 40 is operated as described above and the execution of the energy saving driving means is instructed, the driving efficiency (KE, KC) or the integrated efficiency. The rotation speed (MK3) having the best operating efficiency (KE, KC) or the integrated efficiency (KS) within a predetermined range with respect to the air conditioning load (Hs) is not set as the rotation speed (KM2) with the best (KS). Can be obtained and operated.

For example, when the predetermined capacity range is 80% to 120% of the air conditioning load Hs, the engine 10 and the compressor 11 of the engine 10 and the compressor 11 obtained based on the air conditioning load Hs as shown in FIG. Even if the rotation speed MK1 is a point, the energy saving switch 45 of the operation unit 40 is operated to instruct the execution of the energy saving operation so that the rotation speed MK1 is 80% of the lowest limit of the predetermined capability range. The engine 10 and the compressor 11 can be operated at the rotational speed MK3 (point c) by changing the rotational speed MK3 to be.

This is 100% of the freezing capacity Rn1 obtained when operating at the rotational speed MK1 calculated | required based on the said air conditioning load Hs, and the total freezing capacity Rsum1 obtained now and the total fuel consumed by this are 100% Total refrigeration capacity (equivalent to the total refrigeration capacity Rsum1 when driving the consumption amount Fsum1 and the rotational speed MK1 by 80% by the energy-saving driving means of the present invention) The fuel consumption amount Fsum2 required to obtain Rsum2) will be described with reference to the fuel consumption efficiency graph of FIG. 8, and the air conditioning operation is performed at the rotational speed MK1 determined based on the air conditioning load Hs. When the refrigerating capacity Rsum1 is obtained, the driving efficiency is also lowered to about 1.6 away from the point b, which becomes the highest efficiency, and at the same time, the fuel is operated at a higher rotational speed MK1 than the rotational speed MK3. Consumption rate is high Becomes 62.5% of the fuel consumption amount Fmax at the highest rotation of the engine 10. On the other hand, when the energy saving driving means of the present invention is performed, operation is performed at the rotational speed MK3 which becomes 80% of the rotational speed MK1 as described above, so that the driving efficiency is also close to the highest efficiency b point. Since it becomes d point and improves about 1.8 and the rotation speed of the engine 10 also falls, the fuel consumption rate at this time falls to 44.4% of fuel consumption Fmax. For this reason, in order to obtain the total freezing capacity Rsum2 corresponding to the total freezing capacity Rsum1, the operation time increases by 25% compared with the case of operating on the basis of the air conditioning load Hs. The total fuel consumption Fsum2 can be reduced by 11.1% relative to the Fsum1.

Moreover, since the lower limit value is set to 80% of the air-conditioning load Hs requested from the indoor units 2a and 2b even if the freezing capacity obtained by performing this energy saving operation means is reduced, it is more than necessary. As a result, the refrigeration capacity is not deteriorated, and energy-saving operation can be promoted without giving discomfort to the user.

In addition, in order to perform the energy saving operation means which has the best operation efficiency of both the engine 10 and the compressor 11, as described above, the data of the operation efficiency KE and the data of the operation efficiency KC, or Instead of storing the integrated efficiency KS data in the RAM 34, for example, an operation formula for obtaining the integrated efficiency KS is stored in the ROM 33 or the like and controlled as shown in the flowchart shown in FIG. Can be.

In this case, first, it is judged whether or not the engine driven air conditioner 100 is in operation (step S10), and if not, returning to step S10 to determine whether or not this operation is being performed, and if it is in operation, FIG. The overall air conditioning load Hs is obtained from the air conditioning loads Ha and Hb of each of the indoor units 2a and 2b shown in Fig. 2, and the engine 10 and the compressor 11 corresponding to the air conditioning load Hs are obtained. The rotation speed MK1 is obtained (step S11).

Thereafter, it is determined whether or not the energy saving driving means is executed (step S12). If the execution of the energy saving driving means is not instructed, determination is made as the normal driving means, and the targets of the engine 10 and the compressor 11 are determined. An instruction is made to set the rotational speed MK to be the rotational speed MK1 obtained from the air conditioning load Hs (step S13), and the engine 10 and the compressor 11 operate at the point a and the air conditioning load ( Operation according to Hs) is performed (step S14).

On the other hand, if execution of an energy saving operation means is instructed in step S12, the air-conditioning load Hs1 which becomes 80% of the air conditioning load Hs, and the air-conditioning load Hs2 which becomes 120% of the electric air conditioning load Hs is The rotation speeds MKa and MKb of the engine 10 and the compressor 11 corresponding to the obtained air-conditioning loads Hs1 and Hs2 are determined by the calculation formula recorded in the ROM 35 or the like (step S15). (Step S16). Further, it is determined whether the rotation speed MKa is larger than the rotation speed MK2 which is the best of the integrated efficiency KS (step S17), and if the rotation speed MK2 is smaller than the rotation speed MKa, the rotation speed ( If the rotation speed MK2 is greater than the rotation speed MKa, it is judged whether this rotation speed MK2 is larger than the rotation speed MKb, and MK is made into rotation speed MKa (step S18). If the rotation speed MK2 is greater than the rotation speed MKb (step S19), the rotation speed MK is advanced to the step S22 as the rotation speed MKb (step S20), and the rotation speed MK2 is the rotation speed ( If it is smaller than MKb, the engine 10 and the compressor 11 are operated at the rotational speed MK as the rotational speed MK as the rotational speed MK2 (step S21) (step S22).

As a result, the engine-driven air conditioner 100 automatically performs the air conditioning operation at point c, which has the best operation efficiency KS and does not cause discomfort to the user, and at the same time, the refrigerant per unit volume. Since alternative refrigerant R410a having high capacity and low pressure loss is used, air conditioning operation that promotes energy saving can be performed.

In the present embodiment, the engine-driven air conditioner 100 including the compressor 11 driven by the driving force of the engine 10 has been described. However, the present invention includes a compressor driven in a variable capacity by electric power. Even in the electric drive type air conditioner, data on the operation efficiency of the compressor which is driven by this power with variable power is stored in the RAM 34 and the like, and the power is saved by the power when the operation of the energy saving switch 45 is performed. The operation efficiency of the variable drive compressor can be applied as the best rotation speed. In addition, this invention is not limited to each setting value and piping structure which were shown by the said Example, It can change suitably in the range which does not deviate from the meaning of this invention.

It is suitable for the promotion of energy saving operation of the apparatus whose operation efficiency is changed by the operating state.

1 is a configuration diagram showing one embodiment of an engine driven air conditioner 100 to which the energy saving driving means of the present invention is applied.

2 is a block diagram showing a configuration of a control device.

3 is data of operating efficiency of an engine and a compressor stored in RAM in the control device.

4 is a front view of the operation unit;

Fig. 5 is a diagram showing normal driving means and energy saving driving means of the present invention in Fig. 3;

6 is a flowchart of the energy saving operation means of the present invention.

Fig. 7 shows another embodiment of the energy saving driving means of the present invention in Fig. 3;

Fig. 8 is a diagram showing characteristics of saving energy of the energy saving driving means of the present invention.

9 is a flowchart of another embodiment of the energy saving operation means of the present invention.

<Explanation of symbols for the main parts of the drawings>

1: outdoor unit

2a, 2b: indoor unit

3: Piping between units

10: engine

11: compressor

12: four way valve

13: outdoor heat exchanger

14: outdoor expansion valve

15: accumulator

20a, 20b: indoor heat exchanger

21a, 21b: indoor expansion valve

30: control unit

31: setting unit

32: ROM

33: CPU

34: RAM

35: transceiver

40: control panel

41: display unit

42: run / stop switch

43: operation switching switch

44: temperature setting switch

45: energy saving switch

100: engine driven air conditioner

Claims (8)

An outdoor unit having a compressor driven by an engine driving force and an outdoor heat exchanger, and one or a plurality of indoor units having an indoor heat exchanger are connected by a refrigerant pipe, and the capacity varies according to the air conditioning load detected by the indoor unit. In the engine-driven air conditioner that performs the air conditioning operation so that, An air-conditioning load is calculated on the basis of a temperature sensor or the like provided in the indoor unit, and the engine is operated to operate at a rotational speed at which both the engine and the compressor have the best operating efficiency based on the air-conditioning load. Driven air conditioner. An outdoor unit having a compressor driven by an engine driving force and an outdoor heat exchanger, and one or a plurality of indoor units having an indoor heat exchanger are connected by a refrigerant pipe, and the capacity varies according to the air conditioning load detected by the indoor unit. In the engine-driven air conditioner which performs air conditioning operation easily, Normal operation means for calculating the air conditioning load based on the temperature sensor and the like provided in the indoor unit, and performing operation control of the engine and the compressor at the rotational speed determined based on the air conditioning load, and both the engine and the compressor driving. An engine-driven air conditioner, comprising: energy-saving driving means for driving the engine and the compressor at a rotational speed with the highest efficiency. 3. The engine driven air conditioner according to claim 2, wherein the normal driving means and the energy saving driving means are driving means selected by operation of an operation unit instructing operation of the engine driven air conditioner. The control part which performs operation control of the said engine and a compressor is provided with the data of the rotation speed which the both operation efficiency of the said engine and a compressor is the best, The energy saving by operation of the said operation part of Claim 2 or 3 When the driving means is selected, the engine and the air conditioner are operated by operating the engine and the compressor as the target rotational speed, the data being the data as the target rotational speed or the data which is within a predetermined range based on the air conditioning load. Device. The control part which performs operation control of the said engine and a compressor is provided with the calculation means which calculates the rotation speed which the both operation efficiency of the said engine and a compressor is the best, The operation part of Claim 2 or 3 characterized by the above-mentioned. When the energy saving operation means is selected by the calculation means, the rotation speed at which both the operation efficiency of the engine and the compressor obtained by the calculation means is best is determined as the target rotation speed or within the predetermined range based on the air conditioning load. The engine-driven air conditioner, wherein the engine and the compressor are operated using the rotational speed at which both the driving efficiency of the engine and the compressor obtained by this is the best. The engine driven air conditioner according to any one of claims 1 to 3, wherein the refrigerant circulated to the engine driven air conditioner is a replacement refrigerant (R410A). The control part which performs operation control of the said engine and a compressor is provided with the data of the rotation speed which the both operation efficiency of the said engine and a compressor is the best, The energy saving by operation of the said operation part of Claim 2 or 3 When the driving means is selected, the engine and the compressor are operated by using data as target rotational speed or data which is within a predetermined range based on the air conditioning load, as the target rotational speed, and into the engine driven air conditioner. An engine driven air conditioner characterized by circulating a replacement refrigerant (R410A). The control part which performs operation control of the said engine and a compressor is provided with the calculation means which calculates the rotation speed which the both operation efficiency of the said engine and a compressor is the best, The operation part of Claim 2 or 3 characterized by the above-mentioned. When the energy saving operation means is selected by the calculation means, the rotation speed at which both the operation efficiency of the engine and the compressor obtained by the calculation means is best is determined as the target rotation speed or within the predetermined range based on the air conditioning load. The engine and the compressor are operated as the target rotational speed, which is the highest rotational efficiency of both the engine and the compressor obtained, and circulates the replacement refrigerant R410A into the engine-driven air conditioner. Engine driven air conditioner