JPS6158743B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The object of the present invention is to effectively utilize heat in an air conditioner that uses the power generated by the Rankine cycle to drive a compressor and operate a heat pump cycle. It is.

Generally, the power generated in the Rankine cycle drives the compressor and operates the heat pump cycle.
The overall efficiency of heating and cooling systems is expressed as: R=Amount of heat used for work in a cycle/Amount of heating in a cycle.

Therefore, in order to increase the overall efficiency, a method can be considered in which the amount of heat used is increased, but the amount of heating is decreased. The present invention aims to increase the overall heat utilization efficiency by using the exhaust heat (condensation heat) of the Rankine cycle for heating and dehumidification operation in order to increase the amount of heat used in the former, and also provides a device that can effectively perform the heat utilization. provide. That is, it is characterized by having a Rankine cycle, a heat pump cycle, and a heat transfer cycle.

Embodiments of the present invention will be described below based on the drawings.
1 is an expander, 2 is a first condenser, 3 is a second condenser,
4 is a first pump, and 5 is a generator, which are sequentially connected in a ring to form a Rankine cycle. 6 is a heating device, and 7 is a fan for the second condenser.

Reference numeral 8 denotes a compressor connected to and driven by the expander, 9 a four-way valve for switching the flow direction of the refrigerant, and 10 an outdoor heat exchanger which acts as a condenser during cooling and as an evaporator during heating. Reference numeral 11 indicates a pressure reducing mechanism including a capillary reach tube, etc., and 12 indicates a first indoor heat exchanger, which functions as an evaporator during cooling and a condenser during heating. The compressor 8, the four-way valve 9, the outdoor heat exchanger 10, the pressure reducing mechanism 11, and the first indoor heat exchanger 12 are sequentially connected in an annular manner to form a heat pump cycle. 13
is an outdoor heat exchanger fan.

Reference numeral 14 indicates a second indoor heat exchanger, and reference numeral 15 indicates a second pump, which are successively connected in an annular manner to the first condenser 2 to form a heat transfer cycle.

16 is an indoor fan.

Note that the three closed cycles, that is, the Rankine cycle, are filled with a refrigerant such as R-114, and the heat pump cycle and heat transfer cycle are filled with a refrigerant such as R-12 or R-22. Further, the first indoor heat exchanger 12 and the second indoor heat exchanger 14 are arranged in series (upwind and leeward arrangement) in the air passage. (The first indoor heat exchanger and the second indoor heat exchanger may each be provided with a fan and arranged in parallel.) The operation of the above structure will be explained. First, referring to FIG. 1, the operation during cooling operation will be explained. During cooling, the heating device 6, the first pump 4, and the fans 7 and 1 are used.
3,16 is activated. Therefore, the condensed refrigerant is pressurized by the first pump 4, flows into the generator 5, is heated, and its temperature rises, first becoming a saturated liquid, then successively evaporating to become wet saturated vapor, and then becoming dry saturated vapor to some extent. The superheated steam flows into the expander 1 and does work to generate power. The refrigerant leaving the expander 1 passes through the first condenser 2, liquefies heat in the second condenser 3, and flows into the first pump 4 again.

On the other hand, the refrigerant that has become high temperature and high pressure by the compressor 8 which is connected and driven with the expander 1 flows into the outdoor heat exchanger 10 through the four-way valve 9, radiates heat to the outside air, and is condensed and liquefied. The air is then depressurized in the capillary reach tube 11, flows into the first indoor heat exchanger 12, absorbs heat from the indoor air, and evaporates into gas. Then, it returns to the compressor 8 again through the four-way valve 8.

Incidentally, when performing the dehumidifying operation, if the second pump 15 is operated, the refrigerant in the heat transfer cycle circulates as indicated by the dotted arrow. That is, the refrigerant condensed in the second indoor heat exchanger 14 is sent to the first condenser 2 by the second pump 15, where it receives heat from the Rankine cycle, evaporates, and returns to the second indoor heat exchanger 14 to be condensed.
That is, the refrigerant in the heat transfer cycle is approximately isothermal,
Since the phase change is carried out at an equal pressure, the head of the second pump only needs to cover the pressure loss in the piping, and the flow rate is a liquid with a small specific volume, so the second pump may be small and small in capacity.

Next, the action during heating will be explained based on FIG. 2. During heating, the heating device 6, the first pump 4, the fan 7, the fan 13, the fan 16, and the second pump 15
is activated. Therefore, the refrigerant of the Rankine cycle is pressurized by the first pump 4, flows into the generator 5, is heated, becomes steam, flows into the expander 1, performs work, and generates power. The refrigerant that has exited the expander 1 radiates heat through the first condenser 2 and the second condenser 3, is condensed and liquefied, and flows into the first pump 4 again.

On the other hand, the refrigerant compressed to high temperature and high pressure by the compressor 8 connected and driven with the expander 1 flows into the first indoor heat exchanger 12 by the action of the four-way valve 9, radiates heat to the indoor air, and is condensed and liquefied. After the pressure is reduced in the capillary reach tube 11, it flows into the outdoor heat exchanger 10, where it absorbs heat from the outside air and evaporates, and then returns to the compressor 8 through the four-way valve 9.
Return to

In addition, the refrigerant liquefied in the second indoor heat exchanger 14 is
It is sent to the first condenser 2 by the action of the pump 15, where it is given heat from the Rankine cycle, evaporates into gas, and then flows into the second indoor heat exchanger 12, where it radiates heat to the indoor air and condenses and liquefies. In other words, the refrigerant in the heat transfer cycle undergoes an isothermal and isobaric phase change.

As explained above, the present invention, in addition to the heat pump cycle operated by the power generated by the Rankine cycle, transfers the exhaust heat from the Rankine cycle, that is, the condensation heat, to the indoor heat exchanger and uses it during heating and dehumidification operations. Since it is equipped with a heat transfer cycle, it is possible to effectively utilize heat by using the exhaust heat from the Rankine cycle as a heating heat source or as a reheat amount during dehumidification operation. It consists of a sealed circuit in which an indoor heat exchanger 14, a second pump 15, and a first condenser 2 of a Rankine cycle are sequentially connected in an annular manner. 1
The condenser 2 receives heat from the Rankine cycle, evaporates it into gas, and the second indoor heat exchanger 14 radiates the heat and liquefies it, which undergoes a phase change.The latent heat accompanying the phase change is used, so a predetermined amount of heat is transferred. In addition, the pump head only needs to cover the pressure loss in the piping, and the pump for heat transfer can be small and low-power, and the heat transfer cycle is closed. There is no need for a working medium replenishment device, and the heat transfer cycle is independent from the Rankine cycle and refrigeration cycle, so
This provides an excellent effect in that each cycle can be set optimally.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the circuit configuration of the present invention and the flow direction of the working fluid during cooling operation, and FIG. 2 is an explanatory diagram showing the flow direction of the working fluid during heating operation. 1... Expander, 2... First condenser, 3... Second
Condenser, 4... First pump, 5... Generator, 6...
... Heating device, 8 ... Compressor, 9 ... Four-way valve, 10
... Outdoor heat exchanger, 11 ... Pressure reduction mechanism, 12 ...
1st indoor heat exchanger, 14... 2nd indoor heat exchanger,
15...Second pump.

Claims (1)

[Claims] 1 A Rankine cycle in which an expander, a first condenser, a second condenser, a first pump, and a generator are sequentially connected in a ring, a compressor, a four-way valve, an outdoor heat exchanger, a pressure reduction mechanism, and a first indoor A heat pump cycle in which heat exchangers are sequentially connected in a ring shape; and a heat transfer cycle in which the first condenser is connected in a heat transferable manner, and a second pump and a second indoor heat exchanger are connected in a ring shape. The expander and the compressor are connected by a rotating shaft, the first indoor heat exchanger and the second indoor heat exchanger are installed in parallel, and the first indoor heat exchanger is installed on the upstream side with respect to the indoor fan. An air conditioner in which a second indoor heat exchanger is disposed on the downstream side of the air conditioner.