JPS6038540A - Cold heat accumulating device in air conditioned room cooler system - Google Patents

Abstract

PURPOSE:To speed up the rise time of air conditioned cooling operation by a method wherein the heat exchange between ice and cold water is accelerated and consequently the extraction of cold heat is made possible, even when a cold heat accumulating tank is full of ice, by forming a passage for cold water through the forced heating and melting of the ice in response to the result of the detection of the state of the ice accumulated in the cold heat accumulating tank. CONSTITUTION:A sheathed heating wire 10 is arranged vertically in zigzags along a flowing water passage 9 between heat pipes 6 and 6 and both ends of the wire 10 are led outside a tank 3 so as to be connected through a switch 11 to a power supply 12. A cold water circulating circuit A for cooling, through which cold water 8 is circulated, is arranged at the inlet side and outlet side of the flowing water passage 9 of a cold heat accumulating tank 3. A circulating pump 13, which serves both for flowing the cold water 8 during cold heat accumulation and for extracting the cold heat during air conditioning, a flow sensor 14 to detect the circulating flow rate of the cold water 8, and a valve 15a are provided in the cold water circulating circuit A and electrically connected to a control board 16.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cold storage device that prevents the cold water passageway from being blocked by ice filling in the cold storage tank in an ice cold storage air conditioning system using a heat pipe.

In place of cooling systems that utilize the geothermal energy of water, in recent years, ice storage type air conditioning and cooling systems have been studied that freeze water and utilize the melting heat of ice to reduce the volume of the ice storage tank. ing. This system uses cheap late-night electricity to operate a cold storage device at night, exchange heat with ice and circulating cold water during daytime air conditioning, and circulate this to air conditioning equipment such as fan coil units installed inside the silkworm. This has the advantage of reducing operating costs.

In this German ice storage type air conditioning system, many different types of cold storage devices have been developed. The newest ice cold storage device is an evaporator in a refrigeration circuit that circulates frozen gas and performs cooling by repeating condensation and vaporization, and an air conditioner that can be selectively connected or shut off to the load side circuit. The cold water circulation circuit's ice cold storage tank may be connected with multiple heat pipes. In this device, ice is deposited on the surface of a heat pipe inserted into an ice cold storage tank, forming thick ice there, and during cooling, cold water is passed through and melts the ice to generate circulating cold water. With this structure, compared to a system in which ice is made directly on the surface of the refrigerant tube in the refrigeration circuit, the surface of the heat pipe can be used as the icing surface, so a wider icing area can be obtained, there is less load fluctuation on the refrigerator, and the refrigerant tube It is also possible to make roads darker.

Although this air conditioning system has the advantage of being able to efficiently produce large amounts of ice in a short period of time, if the amount of stored water is not accurately grasped and controlled, the cold storage tank will be filled with ice, causing further damage due to the expansion of the ice. There is a risk of damage to the device. In addition, if ice fills the cold storage tank and blocks the cooling water passage, even if cold water is passed at the start of operation, the cold water that has been cooled by heat exchange will not flow out to the load side. There were problems such as delays in starting up air conditioning and cooling operations.

As a result of individual research conducted in view of these points, the present invention detects the state of ice accumulation in the cold storage tank, and even when it is full of ice, it forms a cold water passage and immediately removes the ice and cold water. We have developed a cold storage device for air conditioning and cooling systems that promotes heat exchange, quickly extracts cold heat, and speeds up the start-up of air conditioning and cooling operations.

That is, the present invention provides an evaporator for a refrigeration circuit that performs cooling by circulating refrigerant gas and repeats condensation and vaporization, and a cold storage system for a cold water circulation circuit for cooling that can be selectively connected to and disconnected from one load side circuit. In an air-conditioning cooling system that performs ice cold storage and cooling by connecting the tank with a plurality of heat pipes and exchanging heat between ice that has formed on the surface of the heat 7947 in the cold storage yard and circulating cold water, In addition to providing a detection mechanism for detecting the state of ice accumulation, an electric heating boat or pipe is placed in the running water passage in the cold storage facility, and the detector f is contaminated.
It is characterized by detecting the amount of ice in the cold storage tank and energizing the heating wires or passing hot water through the pipes to melt the surrounding ice and form a cold water passage. .

Embodiments of the present invention will be described in detail below with reference to the drawings.

1 and 2 show one embodiment of the present invention.

In the figure, J indicates a cold storage device, and there is an evaporator 2 at the top.
However, a cold storage tank 3 is provided at the bottom via a partition plate 4, and the outer periphery of the tank is covered with a heat insulating material 5. Inside this cold storage device 1, partitions &4 are inserted vertically to accommodate a plurality of heat pizoro evaporators 2, and a lower part 6b is placed in a cold storage tank 3, respectively. Inside the Ushita cold storage tank 3, a plurality of baffle plates 7 are installed vertically alternately with gaps between them, and the cold water 8 flowing inside is installed between each heat pipe. A running water passage 9 is formed which meanders up and down. A heat pipe was installed in the running water passage 9 as shown in FIG. 2(A).

A sheathed heating wire 10 is arranged in a vertically meandering manner between 6,
・Both ends pulled out outside the city are connected to power supply No. 2 via switch No. 1.

At the inlet and outlet sides of the water flow passage 9 of the cool storage tank 3, a cold water circulation circuit A for cooling is provided in which cold water 8 circulates. This cold water circulation circuit A includes a circulation pump 3 which serves both to flow the chilled water 8 during cold storage and to take out cold heat when the air is empty, and a flow rate centuary 1 which detects the circulating flow rate of the chilled water 8.
4 and a valve 15a, which are electrically connected to a control panel 16.

The cold water circulation circuit A operates through valves 15b and 15c,
A fan coil unit installed indoors is connected to the load side circuit B that follows the air conditioner noah such as □. This load side circuit B is provided with an air conditioning pump 8, which circulates the cold water 8 sent from the cold water circulation circuit A to the air conditioning equipment 17.
It is designed to let you do so.

Furthermore, a refrigeration circuit C is provided connected to the inlet and outlet sides of the refrigerant flow path of the evaporator 2, and this refrigeration circuit C includes a compressor no.
, an ωf-hKri device 2o, and an expansion device 2o are provided, respectively.

Next, the operation of the ice cold storage air conditioning system having the above configuration will be explained.

For example, when storing ice cold using late-night power, load side circuit B
Close the valves 15b and 15c of the cold water circulation circuit A, open the valve 15m of the cold water circulation circuit A, and in this state, open the control panel 16.
to operate the chilled water circulation circuit A and the refrigeration circuit C.

In the refrigeration circuit C, the refrigerant gas 22 compressed by the compressor 9
reaches the evaporator 2 through the condenser 201 and expansion device 2,
Here, the refrigerant gas 22 returns to the compressor 19 again after exchanging heat with the upper part 6a of the Hitono and Iso 6.

On the other hand, in the cold water circulation circuit A, when the circulation pump J3 is operated, the cold water 8 flows into the inside from the inlet of the cold storage tank 3, and flows through the flowing water passage 9 formed by meandering up and down by the baffle plate 7 installed here. and flows uniformly within the tank.

At this time, the refrigerant gas 22 that has flowed into the evaporator 2 is transferred to the cold storage tank 3 by the high-speed uniform heat transfer action of the Heat Quipro.
This surface is cooled by absorbing heat from the lower part 6b inserted into the holder. In this house, the cold water 8 in the cold storage tank 3 is beat no 4 igu 6
23, ice forms on this surface, and gradually ice 23
is growing thicker.

When an amount of ice 23 of 73F+A is formed on the surface of the heat insulator 6 of the cold storage tank 3 by the above operations, a signal is issued from the control panel J6 to stop the operation. The ice 23 that has formed here is kept cool by the heat insulating material 5 and stored in the cold storage tank 3 until the air conditioning operation is started.

When the air conditioner starts operating, the control is set to 1.
In response to the valve switching signal from 6, valve 15h is turned off, valves j5b and J5c are opened, and chilled water circulation circuit A and load side circuit B are continued, and when the switching is completed, circulation pump J3 and air conditioning pump 8 are operated. Start.

At this time, the amount of water stored in the cold storage tank 3 is large, and as shown in Figure 2 (B)
As shown in the figure, when the tank is filled with ice 23,
Since the cold water 8 does not flow into the cold water circulation circuit A, and even if it does flow, the flow rate is small, this is detected by the flow rate sensor J4, and the detection signal is transmitted to the control panel 16.

When the flow rate of the cold water 8 is less than a predetermined value, an energization signal is sent to the switch 11, which is turned on and energizes the sheathed heating wire JO from the power source J2. When electricity is applied to the sheathed heating wire 10 disposed between the heat pipes 6 and 6 in the running water passage 9, it is heated, and the ice 23 around the sheathed heating wire 10 quickly melts as shown in FIG. A passageway 24 is formed. As a result, the cold water 8 is cooled through the meandering cold water passage 24 while coming into contact with the ice 23 and gradually melting, flowing into the load side circuit B from the cold water circulation circuit A, and being heated by the air conditioner J7 installed indoors. Replace it to cool the room. The cold water 8 circulating in the load-side circuit B is controlled by a valve 15c that operates according to load fluctuations of the air conditioner J7, and the - group cold water 8 is returned to the cold water circulation circuit A and enters the cold storage tank 3. The ice 23 is constantly melted and cooled, and the remaining cold water 8 circulates through the load side circuit B.

FIG. 3 shows another embodiment of the present invention, in which a water passage 9 is provided between the heat pipes f6 and 6. A is a left end or a hollow glass pipe 25, and the end drawn out of the tank is connected to a hot water tank (not shown).

With this structure, when the ice 23 in the cold storage tank 3 becomes full, this is detected, and hot water is passed into the hollow gib 25 in response to a water flow signal from the control panel. The ice 23 is heated and folded to create a continuous cold water passage 24.
It forms the

In the above embodiment, the case where the filling state of the ice 23 in the cold storage tank 3 is detected by the flow rate sensor J4 has been described, but 2.
In addition to this, the filling state of the ice 23 and the amount of water stored may be detected by the following method.

■Method based on water level difference A method that uses a differential pressure transmitter as a water level sensor to detect the total amount of water stored from the difference between the initial water level in the cold storage tank and the rising water level due to ice expansion during ice storage operation.

■Method using methylene blue Methylene blue (C16HI BN5CIS 'nH2
Since O (4 in n) does not freeze and remains in the liquid phase, its concentration increases as the amount of water stored increases. A method of detecting the amount of water stored based on the difference between the concentration and the concentration during operation.

■Method based on electrical resistance difference Taking advantage of the fact that water and ice have different electric rates, two electrode rods are inserted in parallel into a cold storage tank as a sensor, and a Whiston bridge electric circuit is constructed. A method of detecting ice accumulation when water freezes and the equilibrium of the bridge is disrupted.

■Method based on temperature difference Taking advantage of the fact that the thermal conductivity λ (Kcal/mb °C) of ice is almost constant around 0 °C, two temperature sensors are inserted into the cold storage tank to measure the surface of the heat pipe. A method of detecting ice storage method 1 by measuring the temperature difference between water and water.

By using the methods of 1 et al. alone or in combination, the amount of water stored can be detected more accurately and reliability can be increased.

Furthermore, in the above embodiment, the cold storage tank and the evaporator are separated by a partition plate, and a heat pipe is inserted through this. However, the entire heat pipe is installed inside the cold storage tank, and the upper part of each heat pipe is It is also possible to have a structure in which an evaporator is attached to each of them.

As explained above, the cold storage device of the air conditioning cooling system according to the present invention detects the ice storage iB in the cold storage tank and forcibly heats and melts the ice even when it is full of ice. The cold water passage is shaped like IJi, L, which promotes heat exchange between the ice and the cold water, enables rapid extraction of cold heat, and speeds up the start-up of air conditioning operation.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing a cold storage device of an air conditioning cooling system according to an embodiment of the present invention, Figs. FIG. 3 is a horizontal sectional view showing the main parts inside the cold storage tank when a pipe for distribution is installed. l... Cold storage device, 2... Evaporator, 3... Cold storage tank,
4...Partition plate, 6...Heat pipe, 8...°Cold water, 9...Water passage 1.10...Sheathed heating wire, 13
...Circulation pump, 14...Flow rate sensor, 16...
・Control control panel, 17... Air conditioning equipment, 22...
・Refrigerant gas, 23...Ice, 24...Cold water passage, 25
...pipe, A...chilled water circulation circuit, B...load side circuit, C...refrigeration circuit. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] The evaporator of the refrigeration circuit, which circulates refrigerant gas and performs cooling by repeated condensation and vaporization, and the cold storage tank of the cooling water circulation circuit, which can be selectively connected to and disconnected from the load-side circuit, are installed. In an air conditioning and cooling system that performs ice cold storage and cooling by exchanging heat between ice that has formed on the surface of the HEATPAISO in a cold storage tank by connecting it with a real heat pipe, and circulating cold water, the state of ice storage in the cold storage tank is detected. In addition to providing a detection mechanism to
A heating wire or pipe is placed in the water passage in the cold storage tank, and the detection mechanism detects the amount of ice in the cold storage tank, and then energizes the electric heat source or flows hot water to the i4 Ino. do,
A cold storage device for an air conditioning cooling system, characterized in that the surrounding ice is melted to form a cold water passage.