JPH0416693B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to an absorption chiller/heater including a single/double effect absorption chiller equipped with a hot water supply mechanism.

(b) Prior art and its problems A single-double effect absorption chiller that uses low-temperature heat sources such as solar hot water or factory waste water is known, for example, from the Japanese Patent Laid-Open No.
Conventionally, as disclosed in Publication No. 56-64257,
Are known.

Since such conventional single-double effect absorption chillers are for supplying cold water, they are equipped with a boiler to supply isothermal water in winter, or a heat exchanger and boiler are installed to supply hot water using solar heat. It is widely practiced to install hot water supply equipment separately from the single/double effect absorption refrigerator. However, there is a problem in that installing hot water supply equipment separately increases equipment costs.

Additionally, it has been conventional practice to use a single/double effect absorption refrigerator as an absorption heat pump to supply hot water, but since the single/dual effect absorption refrigerator was originally designed to obtain cold water, Control to raise the temperature level of the hot water taken out is complicated and expensive, and there is also a limit to the temperature rise of the hot water taken out, making it impossible to obtain hot water at a high temperature.

(c) Means for Solving the Problems In view of the above problems, the present invention provides a single-double effect absorption refrigerator that utilizes an absorption liquid heated in a low-temperature regenerator by refrigerant from a high-temperature regenerator and solar heat utilization. The absorbing liquid heated in the low-temperature heat source regenerator by a low-temperature fluid such as hot water is combined with the absorber and introduced into the absorber, and the temperature of the hot water in the water pipe stored in the absorber is raised by the sensible heat of the absorbing liquid. After the temperature of the absorption liquid has been raised, the absorption liquid is divided and returned to the low-temperature regenerator and the low-temperature heat source regenerator. A flow path through which condensed refrigerant liquid generated by raising the temperature of hot water in a water pipe stored in a container flows down to a low-temperature heat source regenerator, and a flow path through which refrigerant is circulated from the high-temperature regenerator to the high-temperature regenerator via the low-temperature regenerator. This is an absorption chiller-heater that extracts hot water in winter by forming a refrigerant cycle, and extracts cold water in summer by forming a refrigerant cycle. This eliminates the need to separately install expensive hot water supply equipment, extracts hot water while effectively utilizing a low-temperature heat source, and makes it possible to easily obtain high-temperature hot water.

(d) Embodiment The drawing shows an embodiment of the present invention. 1 shows a heat source tube 2 housed in a container, and a low temperature fluid such as hot water using solar heat flowing through the heat source tube is used as a heating source to transfer refrigerant from an absorption liquid. 3 is a high-temperature regenerator that uses combustion gas such as kerosene or other high-temperature fluid as a heat source to separate the refrigerant from the absorption liquid; 4 is a high-temperature regenerator that uses the refrigerant vapor separated by the high-temperature regenerator as a heat source to absorb A low-temperature regenerator that further separates the refrigerant from the liquid; 5 a condenser that condenses and cools the refrigerant flowing from each of the regenerators 1, 3, and 4 with water in a water pipe 5' stored therein; 6 the condenser; The evaporator 8 sprays the refrigerant liquid from the refrigerant into a cold water pipe 7 housed in the vessel and vaporizes it. absorber for absorption into absorption liquid, 9
and 10 are solution heat exchangers, which include a refrigerant conduit 11, a refrigerant liquid downflow pipe 12, a refrigerant return pipe 14 with a refrigerant pump 13, a first solution pipe 16 with a first solution pump 15, and a second solution pump 17. second solution tube 18, third, fourth and fifth solution tubes 19, 20 with
and 21 to form a refrigeration cycle by circulating refrigerant and absorption liquid, and constitute a single-double effect absorption refrigerator that takes out cold water from a cold water pipe 7 housed in an evaporator 6. Thus, when cold water is taken out, a refrigeration cycle is formed by the circulation of the absorption liquid shown in the solid line arrow and the refrigerant circulation shown in the dashed-dotted line.

22 is a first solution pipe 16 and a third solution pipe 19 so that the absorption liquid discharged by the first solution pump 15 bypasses the low temperature heat source regenerator 1 and is sent from the absorber 8 to the low temperature regenerator 4. A is a valve disposed in the bypass pipe, and 23 is a solution bypass pipe connected to the regenerator and the condenser 5 so that the condensed refrigerant liquid flows down and mixes with the absorption liquid in the low temperature heat source regenerator 1. A refrigerant liquid pipe, B is a valve installed in the pipe, and 24 is a pipe in which the refrigerant flowing from the high temperature regenerator 3 to the low temperature regenerator 4 exchanges heat with the absorption liquid in the low temperature regenerator to become a refrigerant drain. A refrigerant branch pipe connects the refrigerant conduit 11 and the high-temperature regenerator 3 so as to return the refrigerant to the high-temperature regenerator 3, and C is a valve disposed in the branch pipe. Reference numeral 25 denotes a refrigerant blow pipe which connects the solution reservoir and the refrigerant reservoir 26 so that the refrigerant fluid in the refrigerant reservoir 26 of the evaporator 6 flows down and mixes with the absorption fluid in the solution reservoir 27 of the absorber 8. A valve D is provided on the pipe.

E is from the branch point a of the refrigerant pipe 11 to the condenser 5
An on-off valve installed in the refrigerant conduit 11 on the way to F
is the third solution pipe 1 on the way from the high temperature generator 3 to the connection point b of the third solution pipe 19 with the solution bypass pipe 22
9 is an on-off valve provided, G is an on-off valve provided on the second solution pipe 18, H is an on-off valve provided on the refrigerant liquid flow down pipe 12, and I is an on-off valve provided on the combustion heating chamber 28 of the high temperature regenerator 3. a control valve disposed in the fuel supply path 29 to;
Reference numeral 30 denotes a temperature detector that detects the temperature at the outlet of the condenser 5 of the hot water flowing inside the water pipe 5', and when the temperature of the hot water decreases, the opening of the control valve I is increased to increase the temperature of the hot water. When the control valve is raised, the opening degree of the control valve is decreased, and as the control valve I is increased or decreased, the opening degree of the valve A is also increased or decreased.

Therefore, when isothermal water is needed in winter, each valve A,
B, C, and D are opened, and each on-off valve E, F, G, and H are closed, and the refrigerant pump 13 and the second solution pump 17 are
Stop and drive. By operating in this manner, circulation of the absorption liquid shown in the direction of the broken line arrow and circulation of the refrigerant shown in the direction of the two-dot chain line are performed, and the absorption liquid from the low-temperature regenerator 4 and the absorption liquid from the low-temperature heat source regenerator 1 are circulated. The liquid merges with the water and is sprayed into the water pipe 5' in the absorber 8,
The water is heated by the sensible heat of the absorption liquid, and the latent heat of the refrigerant vapor generated in the low-temperature regenerator 4 and the low-temperature heat source regenerator 1 raises the temperature of the water flowing through the water pipe 5' in the condenser 5, and hot water is extracted. be able to. The refrigerant liquid condensed by heat exchange with water in the condenser 5 flows down through the refrigerant liquid pipe 23 and mixes with the absorption liquid in the low temperature heat source regenerator 1 to lower the concentration of the absorption liquid in the regenerator. Prior to hot water supply, the refrigerant in the refrigerant reservoir 26 is also blown into the absorption liquid, and the concentration of the absorption liquid sent to the low-temperature regenerator 4 and the low-temperature heat source regenerator 1 becomes low. As a result, the boiling temperature of the absorption liquid in both the regenerators 1 and 4 rises, so that the pressure inside the condenser 5 and the refrigerant condensing temperature rise, and the hot water taken out reaches a high temperature level.

Furthermore, when the load increases and the temperature of the hot water taken out begins to drop below the set temperature, the opening degrees of control valves I and A are increased by a signal from the temperature detection 30, and the refrigerant is regenerated at low temperature through the refrigerant conduit 11 and the refrigerant branch pipe 24. The flow rate of refrigerant circulating through the regenerator 4 and the high-temperature regenerator 3 and the flow rate of the absorption liquid to the low-temperature regenerator 4 are increased, and the amount of refrigerant generated in the regenerator increases, while the concentration of the absorption liquid is maintained approximately constant. Since the condensation temperature in the condenser 5 is maintained substantially constant and the amount of heat exchanged to the hot water increases, the temperature of the hot water taken out returns to the set temperature again, and the amount of heat of the hot water required for the load can be easily obtained.

(e) Effects of the Invention As described above, the absorption chiller/heater of the present invention has a valve that is provided in the refrigerant branch path that returns refrigerant drain from the low-temperature regenerator to the high-temperature regenerator and opens when hot water is supplied, and a valve that opens when hot water is supplied. A refrigerant liquid path that allows the liquid to flow down to the low temperature heat source regenerator, a valve installed in this refrigerant liquid path that opens when hot water is supplied, and a solution bypass that bypasses the low temperature heat source regenerator and sends the absorbed liquid from the absorber to the low temperature regenerator. A valve installed in the refrigerant path from the low-temperature regenerator to the condenser that opens when hot water is supplied; A valve installed in the refrigerant path from the low-temperature regenerator to the condenser that opens when hot water is supplied. An on-off valve that is installed in the refrigerant flow path from the condenser to the steamer and opens when hot water is supplied; An on-off valve that is installed in the solution path with a solution pump that runs from the low-temperature heat source regenerator to the high-temperature regenerator and opens when hot water is supplied. and a refrigerant and absorption liquid circulation path that switches the opening and closing of the on-off valve that opens when hot water is supplied, which is installed in the absorption liquid path from the high temperature regenerator to the low temperature regenerator, and forms a refrigeration cycle when cold water is taken out, and when hot water is taken out. The refrigeration system is operated by switching the refrigerant and absorption liquid circulation channels so that the absorption liquid is brought to a dilute concentration and boiled, and the hot water is heated by the latent heat of the refrigerant and the sensible heat of the absorption liquid. Heat dissipation effect of the cycle In other words, hot water at a high temperature level can be obtained more easily than when hot water is extracted using a heat pump effect, and an inexpensive low-temperature heat source can be used effectively both when taking out cold water and when taking out hot water. Moreover, the need for separately installing expensive hot water supply equipment is eliminated, and specifications can be selected according to the cold water load side, which is practically beneficial.

[Brief explanation of drawings]

The drawing is a schematic explanatory diagram of a circuit configuration showing an embodiment of the present invention. 1...Low temperature heat source regenerator, 3...High temperature regenerator, 4
...Low temperature regenerator, 5...Condenser, 5'...Water pipe,
6... Evaporator, 7... Absorber, 8, 9... Solution heat exchanger, 11... Refrigerant conduit, 12... Refrigerant liquid down pipe, 18... Second solution tube, 19... Third solution tube,
22...Solution bypass pipe, 23...Refrigerant liquid pipe, 2
4... Refrigerant branch pipe, A, B, C... Valve, E, F,
G, H...Opening/closing valve.

Claims (1)

[Claims] 1 Low temperature heat source regenerator, high temperature regenerator, low temperature regenerator,
In a single-double effect absorption refrigerator that connects a condenser, absorber, and solution heat exchanger, the water pipes housed in the absorber and condenser that supply hot water and the refrigerant drain from the low-temperature regenerator are regenerated at high temperature. A refrigerant branch path that returns to the refrigerant, a valve that is provided in this refrigerant branch path and opens when hot water is supplied, a refrigerant liquid path that allows the refrigerant liquid from the condenser to flow down to the low temperature heat source regenerator, and a valve that is provided in this refrigerant liquid path to flow down to the low temperature heat source regenerator. A valve that opens when hot water is supplied, a solution bypass path that bypasses the low-temperature heat source regenerator and sends the absorption liquid from the absorber to the low-temperature regenerator, a valve that is provided in this solution bypass path and opens when hot water is supplied, and the low-temperature regenerator. A refrigerant path from the condenser to the condenser, an on-off valve provided in this refrigerant path that closes when hot water is supplied, a refrigerant liquid flow path from the condenser to the evaporator, and an on-off valve provided in this refrigerant liquid flow path that closes when hot water is supplied. and,
A solution path with a solution pump from the low-temperature heat source regenerator to the high-temperature regenerator, an on-off valve provided in this solution path that closes when hot water is supplied, an absorption liquid path from the high-temperature regenerator to the low-temperature regenerator, and this absorption liquid path. An absorption chiller-heater characterized by comprising an on-off valve that is provided in the holder and closes when hot water is supplied.