JPS5816137A - Water cooling device for air conditioner - Google Patents

Abstract

PURPOSE:To prevent freezing of cold water and to effectively use the cold heat of LNG by cooling the cold water with Rankine coolant using an LNG cold generator having a Rankine cycle. CONSTITUTION:A part of LNG from a Rankine coolant evaporator 9 of the cold heat generator is taken out and is sent to the water cooler 16, where another cold water in the cooling pipe 17 is cooled to 10 deg.C, and is sent to the LNG evaporator 3 of said generator. In this case, the LNG level at the cooler 16 is regulated to a constant level by a level adjustor 20 together with a control valve 21, and the pressure of the LNG is also controlled by the adjustor 22 and a control valve 18 so that the evaporation temperature of the LNG is above 0 deg.C. Thus, the cold water in the cooling pipe 17 can be optimumly cooled without freezing, providing reliable and economical cooling equipment.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to equipment for cooling cold water for air conditioning using the cold energy of LNG, and particularly relates to a cold water cooling equipment for air conditioning using LNG cold power generation equipment.

BACKGROUND ART Considerations have been made to develop methods and equipment for cooling air conditioning cold water (hereinafter referred to as cold water) using the cold energy of LNG. However, while the temperature range of cold water is 10 to 20 degrees Celsius, the temperature of LNG, which is the cold heat source, is extremely low at 1,160 degrees Celsius, so there is a problem that the cold water freezes. Although various studies have been conducted, reliability,
There are many issues that need to be solved in terms of economic efficiency, and so far it has not been put into practical use.

The present invention is aimed at solving the above-mentioned problems, and provides a cold water cooling equipment for air conditioning that uses LNG cold power generation equipment having a Rankine cycle and cools cold water with a Rankine medium.

An embodiment of the present invention will be explained with reference to the drawings. In addition, in a cold power generation facility having a Rankine cycle, a hydrocarbon fluid such as propane or a fluorocarbon fluid is used as a Rankine medium, but in the present invention, any Rankine medium can be used without any particular restriction, so in this example, , the case where propane is used will be explained.

The drawing is a 70-sheet of a cold water cooling system for air conditioning using a cold power generation facility having a Rankine cycle. In the figure, LNG is approximately 1 oKg/cI with LNG pump 1!
The pressure is increased to IG, and it is sent to the LNG evaporator 3 through the conduit 2, where it is converted into propane (Rankine medium).
By condensing LNG (hereinafter abbreviated as propane), LNG is
After the temperature is raised from 0°C to -55°C and evaporated, it is sent to the warmer 5 through the conduit 4, and the warmer 5 uses seawater etc. as a heat source.
The LNG gas, which has reached a temperature of .degree. C. or higher, is sent as fuel to another user (not shown) through a conduit 6.

On the other hand, OKg/dG condensed in LNG evaporator 3, -45
The propane liquid at °C is pressurized by the Rankine medium pump 7 and sent to the Rankine medium evaporator 9 through the conduit 8. After being heated and evaporated in the Rankine medium evaporator 9 using seawater as a heat source, the propane liquid is passed through the conduit 10. The gas is then fed to the turbine 11, where the gas is expanded to convert the energy into rotational energy, and a generator (not shown) generates electric power. In this case, the propane liquid level in the Rankine medium evaporator 9 is always controlled to a constant liquid level by detecting the propane liquid level with the liquid level regulator 12 and adjusting the valve opening of the liquid level regulating valve 13. . Thereafter, the propane gas is sent to the LNG evaporator 3 via the conduit 14, re-liquefied by the cold heat of the LNG in the LNG evaporator 3, boosted in pressure by the second engine medium pump 7, and passed through the conduit 8 to the Rankine gas. The medium is again fed to the evaporator 9.

Cooling of chilled water is performed as follows using the cold power generation equipment having the above-mentioned Rankine cycle. A portion of the propane liquid is extracted from the Rankine medium evaporator 9, and the extracted propane liquid is sent to the cold water cooler 16 through the conduit 15, and is separated into the cold water cooling pipe 17 internally connected to the cold water cooler 16. After cooling the cold water at a temperature of 15°C to 10°C, which is supplied separately from the place of use (not shown), the temperature is raised and the propane gas is evaporated. After being expanded to /dG, it is sent to the LNG evaporator 3 via the conduit 19 and the conduit 14.

On the other hand, the cold water cooled to 10°C by the cold water cooler 16 is
The other end of the cold water cooling pipe 17 is sent back to another place of use for air conditioning. In this case, the cold water cooler 16 is installed in the liquid level regulator cylinder.
The liquid level of propane is detected and the opening degree of the liquid level control valve 21 is adjusted to maintain a constant liquid level at all times. Further, the pressure of propane gas in the cold water cooler 16 can be automatically adjusted by detecting the pressure of propane gas with a pressure regulator n and using a pressure regulating valve 18.
Propane evaporates at a saturation temperature corresponding to the regulated propane gas pressure. Therefore, the evaporation temperature of propane is determined by the pressure regulator n.

Since it can be selected arbitrarily by the action of the pressure control valve 18, if the propane gas pressure is selected and set so that the evaporation temperature of propane is 0°C or higher, the cold water in the cold water cooling pipe 17 will be heated by propane without freezing. It is cooled down. In addition, changes in the flow rate, temperature, etc. of cold water, changes in load, etc. are handled by the action of the liquid level regulator tube and liquid level control valve 21, and the chilled water cooler 16
The propane liquid level is automatically controlled to maintain a constant liquid level at all times.

As explained above, the present invention provides a cold water cooling equipment for air conditioning in which a cold water cooler is connected to an LNG cold power generation equipment having a Rankine cycle, and the evaporation temperature of the Rankine medium is set to 0°C or higher and the pressure is automatically controlled. It is highly reliable and economical because it is composed of a regulator, a pressure control valve, and a liquid level regulator and a liquid level control valve that automatically control the liquid level of the chilled water cooler to maintain a constant level at all times. This has the effect of preventing cold water from freezing and effectively cooling the cold water using the cold energy of LNG.

[Brief explanation of drawings]

The drawings illustrate one embodiment of the present invention.
... LNG evaporator, 9 ... Rankine medium evaporator, 11 ... turbine, 14. 15.19...
...Conduit, 16...Cold water cooler, 17...
・Cold water cooling pipe, 18...Pressure control valve, addition...
...Liquid level regulator, 4...Liquid level control valve, ρ...
・Pressure regulator

Claims (1)

[Claims] 1. LN with a Rankine cycle, consisting of an LNG evaporator, a Rankine medium evaporator, a Rankine medium turbine, etc.
In a cold water cooling equipment for air conditioning using G cold power generation equipment, a cold water cooler equipped with a cold water cooling pipe and a liquid level regulator and a pressure regulator, and the Rankine medium evaporator are connected to the The liquid level control valve of the pressure regulator is connected to the liquid level control valve of the pressure regulator by a conduit provided midway, and the conduit connecting the outlet side of the Rankine medium turbine and the LNG evaporator and the cold water cooler are connected to the pressure control valve of the pressure regulator. Cold water cooling equipment for air conditioning, characterized in that the two are connected by a conduit installed in the middle.