JP2013011431A - Heat exchange system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchange system which is achieved in energy saving finally by clearing up a calorie in one unit of a second heat exchanger even if a plurality of first heat exchangers operate cooling operations and heating operations to a system having the plurality of first heat exchangers with respect to one unit of the second heat exchanger using a circulation pump.SOLUTION: The circulation pump 4 as a pressurization means is forwardly and reversely rotated to change a flow of a cooling liquid, and the number of revolutions of the pump can be controlled by an inverter or the like. A pump which rotates by a pressure difference is used for a pressure-reduction means, a generator 7 is attached to the pump and applied with a load, and an output of the load is input into the circulation pump, thus achieving the energy saving.

Description

  The present invention relates to a heat exchange system that performs heat exchange between a first heat exchange and a second heat exchanger via an intermediate heat medium such as a coolant.

  All the conventional refrigerators needed lubricating oil, but the oil was diluted by the liquid back, or the oil was not dissolved in the refrigerant, and there were many failures, but it was like a water pump. This is a system that does not use oil.

  Japanese Patent No. 4574104

In a heat exchange system that exchanges heat between a first heat exchanger and a second heat exchanger via an intermediate heat medium, a cooler that integrates several cooling units together to share a coolant Therefore, the required number of units can be operated according to the load, the temperature of each of the multiple units can be set, and the circulating pump can be rotated at will, and can be operated in a wide temperature range. The upper second heat exchanger can be used to save and balance all heat, resulting in very energy saving operation. In the one-on-one case, it is possible to reverse cycle by reversing the circulation pump.
However, when heat exchange is performed between the heat absorption side heat exchanger and the heat radiation side heat exchanger through the intermediate heat medium in this way, there is a problem that the heat efficiency is reduced as compared with the direct type.

  In view of this, the present invention has been made to compensate for a decrease in thermal efficiency when heat is exchanged between the heat absorption side heat exchanger and the heat radiation side heat exchanger via the intermediate heat medium.

  In order to achieve this object, the present invention is configured as follows.

  That is, the first heat exchanger and the second heat exchanger are connected to the coolant circulation path so as to be able to exchange heat, and the coolant is used as a solvent, and the gas is used as a solute at a saturated pressure. The cooling liquid in which the gas is dissolved is circulated through the circulation path, and the second heat exchange is performed by the pump 4 that circulates and compresses the mixed solution of gas and liquid on the high temperature side of the circulation path of the cooling liquid. It is sent to the unit 2 to be cooled and returned to the cooling liquid, and the cooling liquid is rotated by the pressure difference of the decompression means, and a generator is directly connected to it to increase or decrease its load. This system adjusts the evaporation pressure.

As described above, according to the present invention, the pressure is changed by the pressurizing unit and the depressurizing unit provided in the circulation path of the coolant to cause separation or dissolution of the gas as the solute, and the endothermic reaction of the solute at that time. It utilizes the fact that the temperature of the coolant changes due to an exothermic reaction.
In the present invention, the temperature difference from the surroundings is relatively widened by lowering the temperature of the heat absorption side heat exchanger by such an endothermic reaction and increasing the temperature of the heat dissipation side heat exchanger by an exothermic reaction. The heat exchange system with higher heat efficiency than before can be realized, and since the coolant used is water / ammonia, ozone is not generated and it is cheap, and it can be obtained immediately and can be used for energy saving in the future. I wrote the following as a system.
◎ As long as there is a temperature difference, it can be converted into a pressure difference and power can be generated. For example, deep sea water and other ◎ Waste heat recovery can be done easily.
◎ Various devices such as simplification of cooling and heating devices such as electric vehicles

  It is a piping diagram of the heat exchange system which implemented this invention.   It is a piping diagram of a heat exchange system in which the first heat exchanger 1 has several units and the second heat exchanger 2 has one unit.

The pressure reducing means is a pump that rotates with a pressure difference, or a power that can be generated by other methods. The load is applied to the electric power, and the first heat exchanger and the second heat exchanger are added or subtracted.・ Used to control evaporating pressure and change the rotation speed of the circulation pump.
This is a heat exchanging system that is capable of both cooling and heating by using a reversible pump as a pressurizing means, reversing it by attaching an electric motor thereto, and allowing the flow to flow in the opposite direction as necessary.
Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, the piping diagram of the heat exchange system which implemented this invention is shown.
A 1st heat exchanger or a 2nd heat exchanger heat exchanger is a heat exchanger which changes with the state when both heat absorption function and heat dissipation function were put at that time.
FIG. 2 shows a piping diagram of a heat exchange system in which one second heat exchanger and several first heat exchangers are linked.
In addition, all heat exchangers are compatible with various things such as air and water.
As described above with reference to FIG. 1, the first heat exchanger is used as an endothermic exchanger and the second heat exchanger is used as a radiant heat exchanger. The heat exchanger 1 and the 2nd heat exchanger 2 are connected so that heat exchange is possible. The heat medium of the first heat exchanger 1 is, for example, chlorofluorocarbon and is cooled by the coolant in the circulation path 3.
On the high temperature side of the circulation path 3, a circulation pump 4 with an electric motor 5 is disposed as a coolant pressurizing means, and a gas sealing valve 6 and a generator 7 are mounted as a coolant depressurizing means on the low temperature side. Refer to claim 1 for an explanation of the expansion pump 9 in which the expansion pump 9 is arranged.
Further, a saturated gas balance tank 8 is attached to the gas sealing valve 6, and an excess gas is stored therein so that the saturation concentration of the gas does not change even if the temperature of the coolant slightly changes. deep.

The heat exchange system embodying the present invention is configured as described above. First, the circulation path 3 is filled with the cooling liquid, and the circulation pump 4 is operated to place the first heat exchanger 1 and the second heat exchanger 2 between them. Circulate the coolant.
Next, a gas such as ammonia is injected little by little from the gas sealing valve 6 and dissolved in the coolant.
The amount of gas at this time is injected until a saturation pressure in a temperature range with respect to the heat medium of the first heat exchanger 1 is reached.

In the process in which the coolant circulates in the circulation path 3, the pressure is reduced by the expansion pump 9 with the generator 7 and flows into the first heat exchanger 1. The temperature rises due to heat exchange with a high temperature, and the saturated state of the cooling liquid collapses and the dissolved gas is separated.
At this time, the heat of vaporization of the gas is used to cool the intrusion heat from the outside.

On the other hand, the gas and the coolant that have flowed out of the first heat exchanger 1 both increase in pressure through the circulation pump 4 with the electric motor 5 and flow into the second heat exchanger 2 for cooling.
Due to the increase in pressure and the decrease in temperature, the separated gas again dissolves in the coolant.
The temperature of the coolant rises due to the exothermic reaction when the gas dissolves and condenses, and the temperature difference is relatively widened. Here, the cooling effect of the second heat exchanger 2 is improved, but the first heat conduction It will be more efficient because ordinary mechanical compressors use lubricants with poor thermal conductivity, but not in this system.
As described above, the circulation path 3 is interposed between the first heat exchanger 1 and the second heat exchanger 2 using the endothermic reaction when the gas is separated and the exothermic reaction when the gas is dissolved. The decrease in cooling efficiency can be compensated.
In this heat exchange system, the rotation of the circulation pump 4 is reversed, and the flow path of the circulation path 3 is also rotated forward and backward to allow cooling and heating.

FIG. 2 shows a heat exchange system piping diagram in the case of one second heat exchanger 2 and one first heat exchanger.
The circulation pump 4 with the expansion pump 9 and the electric motor 5 attached to the generators 7 on both sides of the plurality of first heat exchangers 1 is connected to the coolant flow 3 in response to the first heat exchanger 1 cooling / heating instruction. The direction is linked to the change of the pump rotation between forward and reverse, and the expansion pump and the direction of the coolant flow 3 change accordingly, and the generator 7 also rotates in the reverse direction to generate electricity. Even if several first heat exchangers 1 change the direction of the cycle, the balance of the heat amount is comprehensively mixed by the second heat exchanger 2 to obtain a high heat exchange rate.

There are various methods for causing a thermal reaction by dissolving a solute in a solvent, such as a method of adsorbing a gas to a solid, a method of mixing a liquid and a liquid, in addition to the method of absorbing a gas in the liquid shown in the examples. is there.
In addition to water and ammonia gas, water and lithium bromide, water and carbon dioxide gas, etc., the solute and solvent combination can adsorb only gas from liquids such as ammonia and carbon disulfide to silica gel and warm it. There is a method of cooling by regenerating and repeating the process, and an antifreezing agent such as ethylene glycol can be added to be used even at a low temperature and the range of use can be expanded.

DESCRIPTION OF SYMBOLS 1 1st heat exchanger 2 2nd heat exchanger 3 Circulation path 4 Circulation pump 5 Electric motor 6 Gas filling valve 7 Generator 8 Tank 9 Expansion pump

Claims (2)

  The first heat exchanger and the second heat exchanger are connected to the coolant circulation path so that heat exchange is possible, and this coolant is used as a solvent and gas is used as a solute until the liquid reaches the saturation pressure. Dissolve and circulate the coolant in which this gas is dissolved in the circulation path, and at the high temperature side of the coolant circulation path, both the gas and the cooling liquid are used as pressurizing means to form a circulation pump with an electric motor. Is a pump that rotates at a pressure difference as a means for reducing the pressure of the coolant, and is named as an expansion pump, but it can also be rotated in reverse. By adjusting the evaporation pressure in the first heat exchanger during cold water and the condensing pressure during hot water, the load output is input to the input power of the circulating pump with an electric motor using a frequency converter to save power. A heat exchange system characterized by aiming. The circulation pump with an electric motor on the high-temperature side pressurization means can be reversely rotated and has a function to change the rotation speed by using an inverter, etc., and the first heat exchanger when the first heat exchanger is used at low pressure or high pressure The rotation speed of the pump with electric motor can be changed by the pressure sensor attached to the vessel.

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