JPH04203862A - Cold water and hot water parallel supplying absorption type refrigerating machine - Google Patents

Abstract

PURPOSE:To produce sufficient high-temperature hot-water without deteriorating the efficiency and performance of refrigerating operation and without any fear of separating crystals out due to the maintaining and condensing of absorbing solution by a method wherein a temperature regulator is provided at the outlet port of hot-water of a parallel supplying water heater and the bypass pipeline of a three-way valve is opened and/or closed by the output signal of the temperature regulator to regulate the amount of cooling water supplied to a condenser. CONSTITUTION:A temperature regulator 13, provided at the outlet port of hot-water of a parallel supplying water heater 7, operates a three-way valve 12 provided at the inlet port of cooling water of a condenser 3 to bypass one part of cooling water by a bypass pipe 26 without conducting it through a condenser 3. The internal temperature of the condenser 3, whose cooling is stopped, is risen and the temperature of the solution of a low-temperature generator 5, communicated with the condenser 3, is risen. On the other hand, refrigerant vapor 18 generated from a high-temperature reproducer 4 provides solution in the low- temperature reproducer 5 with heat, however, the temperature of the solution is risen and therefore, the temperature of the refrigerant vapor 18 is risen. Accordingly, sufficient high- temperature hot-water can be taken out of a parallel supplying water heater 7, employing the refrigerant vapor 18 supplied from the high--temperature reproducer 4 as a heating source, without reducing the temperature of the hot-water.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cold and hot water co-supply type absorption chiller that takes out a portion of hot water during refrigeration operation, and is capable of reducing the co-supply hot water withdrawal temperature when the refrigeration load is reduced. It concerns means of prevention.

[Prior Art] In recent years, dual-effect absorption refrigerators have been provided that utilize heating from a heat source provided in a high-temperature generator to take out both cold water and hot water at the same time.

In conventional technology, when the refrigeration capacity decreases, the amount of absorption liquid, that is, the amount of dilute solution supplied from the 5 absorbers to the high-temperature regenerator and low-temperature regenerator, is reduced to highly concentrate the solution in each regenerator. The generated refrigerant vapor was heated to a high temperature and then led to a co-feed water heater to obtain high-temperature hot water.

Note that related devices of this type include, for example, Japanese Patent Publication No. 59-50908.

[Problems to be Solved by the Invention] The above-mentioned prior art did not take into account the following points in order to reduce the circulating absorption liquid.

Note that in the following explanation, the absorption liquid will be referred to as a solution.

Generally, water is used as the refrigerant and an aqueous lithium bromide solution is used as the absorbent.

1) The heat transfer performance of the solution heat exchanger, which is installed to send the dilute solution from the absorber to each regenerator and recover the heat of the concentrated solution returned from each regenerator to the absorber, decreased due to the decrease in solution. , resulting in decreased efficiency and insufficient performance.

2) The heat transfer performance of the regenerator deteriorates due to a significant decrease in the amount of solution circulation.

3) There is a risk of crystal precipitation due to high concentration of the solution.

4) Since the amount of circulating fluid is significantly reduced, it is necessary to carefully consider the pump characteristics.

The present invention makes it possible to extract sufficient high-temperature hot water even in low refrigeration capacity operation without reducing the efficiency and performance of refrigeration operation, and without the risk of crystal precipitation due to abnormal concentration of the solution (absorbing liquid). The purpose of the present invention is to provide a cold and hot water co-supply type absorption refrigerator.

[Means for Solving the Problems] In order to achieve the above object, the configuration of the cold and hot water co-supply absorption refrigerator according to the present invention includes an evaporator, an absorber, a condenser, a high temperature regenerator, a low temperature regenerator, and a solution. Cold and hot water co-feed type equipped with a heat exchanger, a solution circulation pump, a refrigerant circulation pump, and a piping system that operatively connects these, and a co-feed water heater that guides the refrigerant vapor generated by the high-temperature regenerator to heat the hot water. In an absorption refrigerator, a three-way valve and a bypass pipe connected to one of the three-way valves are provided at the cooling water inlet to the condenser, a temperature regulator is provided at the hot water outlet of the co-feed water heater, and the output of this temperature regulator is The bypass pipe of the three-way valve is opened and closed in response to a signal, and the amount of cooling water supplied to the condenser is adjusted.

That is, the technical idea of the present invention for achieving the above object is as follows.

Focusing on the fact that the temperature inside the condenser changes the solution temperature in the low-temperature regenerator, and that solution temperature governs the temperature of the refrigerant vapor separated from the solution in the high-temperature regenerator, we installed this at the hot water outlet of the co-feed water heater. By controlling the amount of cooling water supplied to the condenser with a three-way valve installed at the inlet, the temperature regulator prevents the temperature inside the condenser from dropping, and as a result, the high temperature supplied to the co-feed water heater is reduced. This prevents the temperature of the refrigerant vapor generated in the regenerator from decreasing.

[Action Co. The operation of the above technical means is as follows.

When the temperature of the hot water drops, the temperature regulator installed at the hot water outlet of the combined water heater issues a command to the three-way cooling water valve to reduce the amount of cooling water flowing to the condenser. As a result, the temperature inside the condenser increases. Therefore, the temperature of the solution in the low-temperature regenerator increases, and the temperature of the refrigerant vapor generated from the high-temperature regenerator also increases, which heats the hot water that is passed to the co-feed water heater, thereby preventing a drop in the hot water temperature. It turns out.

[Example code] Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

The drawing is a system diagram of an absorption type cold/hot water unit with a co-feed water heater according to an embodiment of the present invention.

In the drawings, 1 is an evaporator, 2 is an absorber, 3 is a condenser,
4 is a high temperature regenerator, 5 is a low temperature regenerator, 6 is a solution heat exchanger,
7 is a co-feed water heater, 8 is a solution circulation pump, and 9 is a refrigerant circulation pump.

10 is a temperature regulator provided at the cold water outlet of the evaporator 1, and 11 is a control valve that controls the heating from the heat source 16 in the high temperature regenerator 4 based on the output signal of the temperature regulator.

Further, 12 is a three-way valve provided at the cooling water inlet to the condenser 3, and 13 is a temperature regulator provided at the hot water outlet of the co-supply water heater 7.

14 is a cold water pipe that constitutes a heat exchanger tube section in the evaporator 1;
Reference numeral 5 denotes a cooling water pipe that constitutes a heat exchanger tube portion in the absorber 2 and condenser 3, and 20 represents a hot water pipe that constitutes a heat exchanger tube portion in the co-supply water heater 7.

21 is a dilute solution pipe, 21a is a pipe for sending the dilute solution from the absorber 2 to the high temperature regenerator 4, and 21b is a pipe for sending the dilute solution from the absorber 2 to the low temperature regenerator 5. Further, 22 is a concentrated solution pipe, 22a is a pipe that returns the concentrated solution from the high temperature regenerator 4 to the absorber 2, and 22b is a pipe that returns the concentrated solution from the low temperature regenerator 5 to the absorber 2. 23 is a refrigerant pipe, and 24 is a refrigerant pipe that transfers the generated refrigerant vapor from the high temperature regenerator 4 to the low temperature regenerator 5. 25 is a steam pipe that sends a part of the refrigerant vapor generated from the high-temperature regenerator 4 to the co-supply water heater 7; 26 is a bypass of the cooling water piping system connected to one side of the three-way valve 12; It's a tube.

Next, the operation of the absorption type cold/hot water unit shown in the drawings will be explained.

Refrigerant (water) vapor 17 that is evaporated by removing heat from the cold water in the cold water pipe 14 in the evaporator 1 is absorbed by a lithium bromide aqueous solution (absorbing liquid) in the absorber 2.

Since the diluted solution has a reduced absorption capacity, the diluted solution is sent to the low temperature regenerator 5 via the pipe 21b via the solution heat exchanger 6 by driving the solution circulation pump 8 to the high temperature regenerator 4 via the pipe 21b.

The dilute solution supplied to the high-temperature regenerator 5 is heated and concentrated using burner combustion gas, steam, etc., which is an external heat source 16, to recover its absorption capacity, and the concentrated solution passes through the pipe 22a and the solution heat exchanger 6. Return to absorber 2.

On the other hand, the refrigerant vapor 18 separated from the solution during heating and concentration is led to the low-temperature regenerator 5 through the refrigerant pipe 24, where the dilute solution supplied here is heated and concentrated, and then flows into the condenser 3. Further, the solution concentrated in the low-temperature regenerator 5 passes through the pipe 22b and the solution heat exchanger 6, joins with the concentrated solution from the high-temperature regenerator 5, and is returned to the absorber 2. The separated refrigerant vapor 19 flows into the condenser 3 in the same way as the generated vapor 18 in the high temperature regenerator 4. Here, the cooling water pipe IS after cooling the inside of the absorber 2
is cooled, condensed, and returned to the evaporator 1.

The co-feed water heater 7 is connected to the high-temperature regenerator 4 by a steam pipe 20 that guides refrigerant vapor.

A part of the refrigerant vapor 18 separated from the dilute solution in the high-temperature regenerator 4 during the refrigeration operation flows into the co-feed water heater 7 through the steam pipe 25, and flows through the heat transfer tube section of the hot water pipe 20 provided here. Heat and warm water.

Now, when the refrigerant vapor 18 is at its maximum output, the heating source 1
6 also has the maximum amount of heat, so it is high temperature and high pressure, but if the amount of heat from the heating source 16 is decreased, the temperature and pressure will decrease, so the hot water temperature in the co-feed water heater 7 will drop. . Therefore, the temperature regulator 13 installed at the hot water outlet of the co-feed water heater 7 is connected to the three-way valve 1 installed at the cooling water inlet of the condenser 3.
2 is activated, and a part of the cooling water is bypassed through the bypass pipe 26 without being passed to the condenser 3. The internal temperature of the condenser 3 that is no longer cooled rises, and the solution temperature of the low-temperature regenerator 5 with which it is connected rises.

On the other hand, the generated refrigerant vapor 18 from the high-temperature regenerator 4 gives heat to the solution in the low-temperature regenerator 5, but since the solution temperature increases, the temperature of the refrigerant vapor 18 increases.

Therefore, the refrigerant vapor 18 supplied from the high temperature regenerator 4
The co-supply water heater 7 which uses the water as a heating source can take out sufficiently high-temperature hot water without lowering the hot water temperature.

According to this embodiment, high-temperature hot water can be taken out despite a decrease in the refrigerating capacity, that is, a decrease in the regenerator heating amount, and this can be achieved only by controlling the cooling water to the condenser. Therefore, there is almost no reduction in efficiency or lack of performance in refrigeration operation, and it also has the effect of preventing crystal precipitation due to abnormal concentration of the solution.

[Effects of the Invention] As explained in detail above, according to the present invention, the efficiency and performance of refrigeration operation are not reduced, and there is no fear of crystal precipitation due to abnormal concentration of the solution (absorbing liquid). It is possible to provide a cold and hot water co-supply type absorption refrigerator that can take out a sufficient amount of high-temperature hot water even when operating at refrigerating capacity.

[Brief explanation of the drawing]

The drawing is a system diagram of an absorption type cold/hot water unit with a co-feed water heater according to an embodiment of the present invention. 1... Evaporator, 2... Absorber, 3... Condenser, 4
. . . High temperature regenerator, 5. Low temperature regenerator, 6. Solution heat exchanger, 7. Co-feed water heater, 8. Solution circulation pump, 9. Refrigerant circulation pump, 12. ...three-way valve, 13
...Temperature controller, 14...Cold water piping, 15...Cooling water piping, 20...Hot water piping, 25...Steam pipe, 2
6...Bypass pipe.

Claims (1)

[Claims] 1. An evaporator, an absorber, a condenser, a high-temperature regenerator, a low-temperature regenerator, a solution heat exchanger, a solution circulation pump, a refrigerant circulation pump, and a piping system that operatively connects these. In a co-feed cold and hot water absorption refrigerator equipped with a co-feed water heater that heats hot water by guiding refrigerant vapor generated by a high-temperature regenerator, a three-way valve and one of the three-way valves are connected to the cooling water inlet to the condenser. A temperature regulator is provided at the hot water outlet of the co-feed water heater, and an output signal of the temperature regulator opens and closes the bypass pipe of the three-way valve to adjust the amount of cooling water supplied to the condenser. A cold and hot water co-feed absorption chiller characterized by: