JPS6160351B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner in which a heat pump cycle is driven by a Rankine cycle heat engine, and an object of the present invention is to improve the coefficient of performance during cooling operation.

Conventionally, this type of air conditioner uses a Rankine cycle system, which sequentially connects a condenser 1, a working fluid pump 2, a generator 4 heated by a heat source 3 such as a gas burner, and an expander 5, as shown in FIG. The structure was such that a heat pump cycle in which a compressor 6, an outdoor heat exchanger 7, a capillary tube 8, and an indoor heat exchanger 9 were sequentially connected was driven by a heat engine.

Therefore, the input heat for driving the Rankine cycle is obtained by burning fuel such as gas in the heating source 3 such as a gas burner, but the condensation heat of the Rankine cycle and the condensation heat of the heat pump cycle are not used and are was wasted. Therefore, the heating source 3 consumes an extremely large amount of fuel, resulting in high running costs, and has the disadvantage that the ratio of cooling capacity to input heat, that is, the coefficient of performance of the air conditioner is poor.

In addition, in order to increase the efficiency of large Rankine cycle heat engines such as those used in power plants, there are devices that use the condensation heat of the Rankine cycle itself to reduce the amount of heat input. Utilizing heat has the disadvantage that sufficient effects cannot be obtained and the equipment required for this purpose is complicated and large.

The present invention effectively utilizes the thermal energy of the working fluid on the discharge side of the compressor of the heat pump cycle to eliminate the above-mentioned conventional drawbacks.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In Figure 1, 10 is a common condenser for the Rankine cycle and the heat pump cycle, and 1
1 is a working fluid pump, 12 is a generator heated by a heating source 13 such as a gas burner, and 14 is an expander, and by sequentially connecting these, a Rankine cycle heat engine is constructed. On the other hand, the heat pump cycle includes a compressor 15 driven by the Rankine cycle heat engine, the condenser 10,
It is constructed by sequentially connecting a capillary tube 16 and an evaporator 17, and the discharge side of the compressor 15 is connected between the Rankine cycle generator 12 and the expander 14. Note that 18 and 19 are a condenser fan and an evaporator fan.

FIG. 2 shows the Rankine cycle and heat pump cycle of the above embodiment on a Mollier diagram (pressure-enthalpy diagram) of the working fluid, and each point with a symbol corresponds to the part with the same symbol in FIG. 1. represents the state of the working fluid.

Next, the operation of the above configuration will be explained. In the condenser 10 shared by the Rankine cycle and the heat pump cycle, the condensed and liquefied working fluid is divided after leaving the condenser 10, and a part of it is depressurized to the evaporation pressure in the capillary tube 16 (a→ f) From indoor air guided to the evaporator 17 and blown there by the evaporator fan 19,
After absorbing heat and evaporating, it acts as a cooling agent (f→
g), it is sucked into the compressor 15 and discharged as superheated steam at high temperature and high pressure (g→h). On the other hand, the remaining liquefied working fluid that has been diverted is transferred to the working fluid pump 11.
is inhaled and the pressure is increased (a→b). Thereafter, it is heated by the heating source 13 in the generator 12 to raise its temperature, first becomes a saturated liquid, and then evaporates successively and leaves the generator 12 in the state of wet saturated steam (b→c). The working fluid that has exited the generator 12 and the working fluid that has been discharged from the compressor 15 are combined to form a somewhat superheated steam state (d), which flows into the expander 14 and undergoes adiabatic expansion.
After generating power to drive the compressor 15 (d→
e), it is led to the condenser 10 again, and is radiated by the action of the condenser fan 18 and condensed and liquefied (e→
a).

Therefore, the amount of working fluid that circulates through the generator 12 is much smaller than the amount of circulating fluid that flows through the expander 14 to generate power, minus the amount of circulating fluid discharged from the compressor 15. In the vessel 12, only the heating source 13 is used to turn the steam into a moist, saturated state (b→c), so the amount of fuel consumed by the heating source 13 such as a burner is also very small, resulting in lower running costs and improved coefficient of performance. do. Further, as described above, since the amount of working fluid circulating through the generator 12 is small, the pipe 4 constituting the generator 12
Another feature is that the diameter (not shown) can be reduced.

Next, another embodiment of the present invention will be described with reference to FIG. The component parts in FIG. 3 are the same as those in the embodiment shown in FIG. 1 and are therefore given the same reference numerals. however,
In this embodiment, the discharge side of the compressor 15 is connected between the working fluid pump 11 and the generator 12 of the Rankine cycle. Therefore, the working fluid pump 1
The liquefied working fluid pressurized in step 1 merges with the superheated gas-like working fluid discharged from the compressor 15 and becomes a somewhat wet steam state (point i in Figure 2), which is then transferred to the generator 12.
Here, it is heated by the heating source 13 to become a somewhat superheated steam state (d), and flows into the expander 14.

Therefore, in the generator 12, the working fluid is almost in a wet saturated vapor state, ie, in a two-phase flow state. In general, the heat transfer characteristics of a working fluid are more similar to those shown in this example than in the case of single-phase flow such as liquid or gas.
Since the phase flow state is better, the heat transfer area of the generator 12 can be reduced and the equipment can be made smaller.

Note that by connecting the discharge side of the compressor 15 between the Rankine cycle generator 12 and the expander 14, the amount of working fluid circulating through the generator 12 can be extremely reduced. The diameter of the pipe constituting 12 can be reduced.

Furthermore, by connecting the discharge side of the compressor 15 between the Rankine cycle working fluid pump 11 and the generator 12, the flow of the working fluid in the generator 12 can be made almost into a two-phase flow state. The heat transfer area of the heat generator 12 can be reduced, and the device can be made more compact, resulting in great practical effects.

As is clear from the above description, the air conditioner of the present invention is provided with a common condenser for each of the Rankine cycle and the heat pump cycle, and the Rankine cycle is constructed by sequentially connecting the condenser, working fluid pump, generator, and expander. A cycle heat engine is installed,
The compressor of the heat pump cycle is connected to the expander, and the discharge side of the compressor is connected between the working fluid pump of the Rankine cycle and the expander, and it has a configuration with fewer component devices than the conventional one. It is possible to effectively utilize the thermal energy of the working fluid on the compressor discharge side of the heat pump cycle, reducing the amount of heat input into the Rankine cycle generator, or in other words, reducing the fuel consumption of heating sources such as gas burners. It has an extremely high coefficient of performance, low running costs, and excellent energy-saving air conditioning.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of an embodiment of the air conditioner of the present invention, Fig. 2 is a Mollier diagram showing its cycle, Fig. 3 is a circuit diagram of another embodiment of the invention, and Fig. 4 is a circuit configuration diagram of a conventional air conditioner. 10... Condenser, 11... Working fluid pump, 1
2... Generator, 13... Heat source, 14... Expander, 15... Compressor, 16... Capillary tube, 17... Evaporator.

Claims (1)

[Scope of Claims] 1. A condenser is provided that is shared by both the Rankine cycle and the heat pump cycle, and the condenser, working fluid pump, generator, and expander are sequentially connected to form a Rankine cycle heat engine, The compressor of the heat pump cycle and the expander are connected, and the discharge side of the compressor is connected between the working fluid pump and the expander of the Rankine cycle, and the suction side of the compressor is connected to the evaporator and the expansion device. An air conditioner connected to the outlet side of the above shared condenser via. 2. The air conditioner according to claim 1, wherein the discharge side of the compressor is connected between a Rankine cycle generator and an expander. 3. The air conditioner according to claim 1, wherein the discharge side of the compressor is connected between a Rankine cycle working fluid pump and a generator.