JPH0321826B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an absorption heat pump that raises the temperature of a fluid to be heated, such as hot water, by utilizing heat radiation on the heat radiation side of an absorption refrigeration cycle, that is, in an absorber and a condenser.

Although this type of absorption heat pump has the advantage of efficiently increasing the temperature of the heated fluid, the temperature of the heated fluid that is taken out is limited by the temperature conditions of the heat source fluid flowing through the evaporator. If the temperature drops below the rated value, not only will the fluid to be heated not reach the specified temperature, but there will also be problems such as heat being radiated from the absorber side to the evaporator side, preventing normal operation. When using river water as the fluid, for example, there is a problem in that the heat source fluid freezes and the operation has to be stopped.

In view of these points, the present invention provides a system in which when the temperature of the heat source fluid falls below the rated value, that is, the set temperature, the concentrated absorption liquid (hereinafter referred to as concentrated liquid) is removed from the fluid extraction pipe housed in the absorber. By adopting a configuration in which the absorption liquid is circulated in a manner similar to that of the heat source fluid and the amount of heating to the generator is adjusted by detecting the temperature at which the heated fluid is taken out, regardless of the temperature conditions of the heat source fluid,
The purpose is to stably extract heated fluid at a predetermined temperature.

Embodiments of the present invention will be described below with reference to the drawings.
1 is equipped with a combustion burner 2, and is equipped with a diluted absorption liquid (hereinafter referred to as
3 is a separator that separates the concentrated liquid from the generator 1 from the refrigerant vapor; 4 is the separator for the refrigerant vapor from the separator 3; 6 is an evaporator that sprays the condensed refrigerant liquid flowing down from the condenser 4 to a heat source tube 7 housed in the container and vaporizes it. , 8 is separator 3
The absorber and 9 are solution heat exchangers, which spray the concentrated liquid from the liquid into the fluid take-out pipe 5 housed in the container and cool it with the heated fluid in the pipe, while absorbing the vaporized refrigerant into the concentrated liquid. A liquid lift pipe 10, a concentrated liquid pipe 11, a dilute liquid pipe 13 having a solution pump 12, and a refrigerant vapor pipe 14
and are connected by a refrigerant liquid down pipe 15 to form a circulation path for the refrigerant and the absorption liquid.

Reference numeral 16 designates a concentrated liquid pipe 11 on the outlet side of the concentrated liquid solution heat exchanger 9 and a vessel wall above the absorption liquid reservoir 17 in the absorber 8 so as to bypass the fluid take-out pipe 5 housed in the absorber 8. A bypass pipe is connected to the bypass pipe, and the bypass pipe is equipped with an on-off valve 18. Also, concentrated liquid tube 11
Also, an on-off valve 19 is provided. In addition, instead of these on-off valves 18 and 19, a concentrated liquid pipe 11 and a bypass pipe 16 are used.
A three-way valve (not shown) may be provided at the connection portion.

Reference numeral 20 denotes a temperature detector provided in the heat source tube 7 on the inlet side or the outlet side of the evaporator 6, and the on-off valves 18 and 19 are switched between opening and closing based on a signal from the detector. Further, 21 is a fluid take-out pipe 5 on the outlet side of the condenser 4 for the fluid to be heated.
A temperature detector is provided for controlling the combustion amount of the burner 2 based on a signal from the detector.

When the temperature of the heat source fluid detected by the temperature detector 20 is higher than the set temperature, the on-off valve 18 is closed and the on-off valve 19 is opened to form a circulation path for the refrigerant and absorption liquid. absorber 8
The temperature of the fluid to be heated is raised by the heat dissipation action in the condenser 4, and when the temperature of the fluid to be heated detected by the temperature detector 21 becomes below the rated value, the combustion amount of the burner 2 is increased and the amount of combustion to the generator 1 is increased. Increase the amount of heating,
By increasing the temperature and amount of refrigerant vapor flowing into the condenser 4, the temperature of the heated fluid is adjusted to reach the rated value.

Next, when the temperature of the heat source fluid detected by the temperature detector 20 falls below the set temperature, the on-off valve 18 is opened, the on-off valve 19 is switched to close, and the concentrated liquid is passed through the bypass pipe 16. , the circulation of the absorption liquid is switched and operated, and the temperature of the heated fluid is raised by the heat dissipation effect in the condenser 4. Moreover, when the temperature of the heated fluid detected by the temperature detector 21 becomes below the rated value, the combustion amount of the burner 2 is increased and adjusted so as to reach the rated value. In this way, the fluid to be heated at a predetermined temperature can be stably taken out regardless of the temperature conditions of the heat source fluid.

Note that the set temperature of the heat source fluid is appropriately selected based on design specification values such as the capacity of the absorption heat pump. When the temperature detector 20 is provided on the inlet side of the evaporator 6, the set temperature is set higher than when the temperature sensor 20 is provided on the outlet side of the evaporator 6. The former case has the advantage of being able to directly detect the temperature of the supplied heat source fluid, while the latter has the advantage of being able to detect the risk of freezing of the heat source fluid during operation of the heat pump.

As described above, the present invention provides a heat source fluid that is provided in the absorption liquid path between the absorber and the solution heat exchanger, and that flows through the bypass pipe that bypasses the absorber and the heat source pipe that is housed in the evaporator. This is because it is an absorption heat pump equipped with a mechanism that allows concentrated liquid to flow into a bypass pipe when the temperature drops below a set temperature, and a mechanism that detects the temperature of the heated fluid at the outlet of the condenser and adjusts the amount of heating to the generator. , so to speak, is a simple type of conventional absorption heat pump that is equipped with a simple switching mechanism for circulation of absorption liquid, and can stably extract heated fluid at a predetermined temperature regardless of the temperature conditions of the heat source fluid. , which is useful in practice.

[Brief explanation of the drawing]

The drawings are schematic explanatory diagrams of circuit configurations showing embodiments of the present invention. DESCRIPTION OF SYMBOLS 1... Generator, 2... Burner, 4... Condenser, 5... Fluid extraction pipe, 6... Evaporator, 7...
... Heat source tube, 8 ... Absorber, 9 ... Solution heat exchanger,
11... Concentrated liquid pipe, 16... Bypass pipe, 18,1
9...Opening/closing valve, 20, 21...Temperature detector.

Claims (1)

[Claims] 1 Connect the generator, condenser, evaporator, absorber, and solution heat exchanger with piping to form a circulation path for the refrigerant and absorption liquid, and raise the heated fluid in the liquid extraction pipe stored in the absorber and condenser. In an absorption heat pump that generates heat, the temperature of the heat source fluid flowing through the bypass pipe that bypasses the absorber, which is installed in the absorption liquid path between the absorber and the solution heat exchanger, and the heat source pipe housed in the evaporator, is below the set temperature. An absorption heat pump characterized by comprising a mechanism for flowing concentrated absorption liquid into a bypass pipe when the above occurs, and a mechanism for detecting the temperature of the fluid to be heated at the condenser outlet side and adjusting the amount of heating to the generator. .