JPH076709B2 - Absorption type water heater - Google Patents

Description

TECHNICAL FIELD The present invention relates to an absorption chiller-heater, and more particularly to an absorption chiller-heater having a structure for taking out heating hot water from an evaporator.

[Conventional technology]

FIG. 5 shows an absorption type cold / hot water machine which takes out heating hot water from the evaporator, for example, as described in JP-A-62-213663. The illustrated one is a parallel flow type absorption cooling and heating machine provided with a plurality of regenerators, and this heating operation is performed as follows. First, the high temperature regenerator 9 is provided with a combustion heat source 11 of gas, oil or the like, and heats the internal solution to generate steam. This steam is directly introduced into the evaporator 1 via the cooling / heating switching valve 14 and is sprayed, heats the water flowing through the heat transfer pipe 4 in the evaporator 1, and the steam is condensed and liquefied. The heated flowing water is used as heating water for heating. The refrigerant liquid 2 condensed and liquefied in the evaporator 1 is fed by the refrigerant pump 3 between the absorber 5 and the solution pump 7 via the refrigerant switching valve 17 to dilute the absorbing solution. The diluted solution is fed by a solution pump 7 to a high temperature regenerator 9 and a low temperature regenerator 10 having no heat source. The concentrated solution concentrated in the high temperature regenerator 9 and the solution in the low temperature regenerator 10 are sprayed into the absorber 5 via the heat exchanger 8 and complete the cycle.

[Problems to be Solved by the Invention]

The pressure in the evaporator and absorber is determined by the hot water temperature,
The temperature of the sprayed solution in the absorber is determined by the pressure in the absorber and the concentration of the sprayed solution. When the temperature of the solution is high, there is a problem that the heat transfer tube (not shown) arranged in the absorber 9 is exposed to a high temperature (for example, 90 ° C.) and durability is deteriorated, and it cannot occur during cooling. Such repeated thermal stress may cause deformation of the heat transfer tube or excessive load on the fixed portion with the tube plate, resulting in a decrease in aged life or damage.

It is an object of the present invention to reduce the thermal stress in the heat transfer tube in the absorber during heating to improve the aging life, and also to improve the corrosion resistance of the heat transfer tube, the concentration of the solution sprayed on the heat transfer tube. It is an object of the present invention to provide an absorption chiller-heater capable of reducing the temperature by diluting water.

[Means for Solving the Problems]

The above object consists of an evaporator, an absorber, a high temperature and low temperature regenerator, a heat exchanger, a solution pump, a refrigerant pump and a piping system for operatively connecting them, and vapor of the high temperature regenerator is vaporized through an on-off valve. In the absorption chiller-heater that heats the warm water for heating while circulating the concentrated solution obtained by the high-temperature regenerator to the absorber, the discharge side of the refrigerant pump and the pipe circulating the concentrated solution are opened / closed. It is achieved by supplying the diluted refrigerant solution in the evaporator to the concentrated concentrated solution returned from the regenerator before circulating it to the absorber by the refrigerant pump during heating.

In addition, the above-mentioned purpose is evaporator, absorber, high temperature and low temperature regenerator,
It consists of a heat exchanger, a solution pump, a refrigerant pump, and a piping system that operatively connects these, and guides the steam of the high-temperature regenerator to an evaporator through an on-off valve to heat the hot water for heating and by the high-temperature regenerator. In the absorption chiller-heater that recirculates the obtained concentrated solution to the absorber, the discharge side of the refrigerant pump and the high temperature regenerator are connected via an on-off valve, and the refrigerant liquid in the evaporator is heated by the refrigerant pump during heating. It is achieved by supplying it to a high temperature regenerator and diluting it.

Further, the above object is composed of an evaporator, an absorber, a high temperature and low temperature regenerator, a heat exchanger, a solution pump, a refrigerant pump and a piping system for operatively connecting them, and the high temperature regenerator is vaporized through an on-off valve. In the absorption chiller-heater that guides the heating water to the heater and heats the concentrated solution obtained by the high-temperature regenerator to the absorber, the discharge side of the refrigerant pump and the low-temperature regenerator are opened and closed via an on-off valve. This is achieved by connecting and supplying the refrigerant liquid in the evaporator to the low temperature regenerator by means of a refrigerant pump for dilution during heating.

[Action]

Since the concentrated solution mixes with the refrigerant liquid and is sufficiently diluted in the process of returning to the regenerator or absorber, the concentration of the solution sprayed on the absorber is kept rare. The temperature of the solution sprayed into the absorber is determined by the pressure in the absorber (which is determined by the temperature of the flowing water supplied) and the concentration of the solution sprayed, and thus is sprayed. The temperature of the solution is also kept at a safe low temperature.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

First, the cooling cycle of the absorption chiller-heater will be described with reference to FIG.

The inside of the evaporator 1 is maintained at about one-hundredth atmospheric pressure, in which the refrigerant 2 (water) is heated by a refrigerant pump 3 and a heat transfer tube 4 through which cold water passes.
It is sprayed on and takes the heat of cold water to evaporate, producing a cooling effect. The evaporated refrigerant vapor is kept at a low pressure by cooling water and flows into the absorber 5, where it is absorbed by the lithium bromide aqueous solution sprayed on the absorber heat transfer tube 6, and the lithium bromide aqueous solution becomes rare. This diluted solution is sent by the solution pump 7 through the heat exchanger 8, part of which is sent to the high temperature regenerator 9 and the rest of which is sent to the low temperature regenerator 10.
Is heated and separated into steam and a concentrated solution. In the low temperature regenerator 10, the dilute solution is heated by the steam generated in the high temperature regenerator 9 and separated into steam and concentrated solution. The solution thus concentrated is again sprayed into the absorber 5 via the heat exchanger 8. The drain that has heated and condensed the solution in the low temperature regenerator 10 is guided to the condenser 12.

Further, the vapor generated in the low temperature regenerator 10 is condensed in the condenser 12. The condensed refrigerant produced in this way is guided to the evaporator 1 and sprayed to complete the cycle.

Next, the heating cycle will be described with reference to FIG.
The refrigerant vapor generated in the high temperature regenerator 9 is directly introduced into the evaporator 1 via the refrigerant switching valve 14 and is sprayed. The refrigerant flowing through the heat transfer pipe 4 in the evaporator 1 is heated by the refrigerant. The vapor condenses and liquefies. The heated flowing water is used as warm water for heating, for example. The refrigerant liquid 2 condensed and liquefied in the evaporator 1 is guided by the refrigerant pump 3 to the solution spray pipe 13 of the absorber 5 via the refrigerant switching valve 15 and the return pipe 20, and the solution sprayed to the absorber 5 is diluted. (About 4%). The diluted absorption liquid is sent to the high temperature regenerator 9 and the low temperature regenerator 10 via the absorber 5, the solution pump 7 and the heat exchanger 8. Then, the concentrated solution concentrated in the high temperature regenerator 9 and the solution in the low temperature regenerator 10 are diluted again in the spray pipe 13 of the absorber 5 via the heat exchanger 8 to complete the cycle.

As described above, the concentrated solution returned from the regenerator is sufficiently diluted in the solution spray pipe 13, so that the solution concentration sprayed in the absorber 5 is kept rare, that is, the absorber 5
The temperature of the solution sprayed in can also be kept low.

FIG. 3 shows another embodiment, in which the return pipe 20 is connected to the high temperature regenerator 9, and the discharge port of the return pipe 20 is opened above the surface of the concentrated solution so as to be poured onto the surface of the concentrated solution. ing. This is to prevent the poured refrigerant liquid from mixing with the concentrated solution as much as possible and improve the dilution effect of the solution in the spray pipe 13.

According to this embodiment, in addition to the dilution effect, there is an effect that the connection of the pipe is easy.

FIG. 4 shows a still another embodiment in which the return pipe 20 is connected to the low temperature regenerator 10. As in the previous embodiment, the discharge port of the return pipe 20 is poured onto the surface of the concentrated solution so that the concentrated solution is poured. This is to prevent mixing with the poured refrigerant liquid or concentrated solution as much as possible and to improve the dilution effect of the solution in the spray pipe 13.

According to this embodiment, in addition to the dilution effect, there is an effect that the connection of the pipe is easy.

〔The invention's effect〕

According to the present invention, by providing a switching valve for guiding steam from the high temperature regenerator to the evaporator and a pipe for guiding the refrigerant liquid from the discharge side of the refrigerant pump to the regenerator or the return solution system from the regenerator, a simple Air conditioning operation can be performed only by operating the valve.

[Brief description of drawings]

1 to 4 are system system diagrams of an absorption chiller-heater according to the present invention, FIG. 1 is a system system diagram during cooling of one embodiment, and FIG. 2 is a system system diagram during heating. FIG. 3 is a system diagram of another embodiment during heating, FIG. 4 is a system diagram of yet another embodiment, and FIG. 5 is a system diagram of a conventional absorption chiller-heater during heating. 1 ... Evaporator, 3 ... Refrigerant pump, 4 ... Evaporator heat transfer tube, 5 ...
Absorber, 6 ... Absorber heat transfer tube, 7 ... Solution pump, 8 ... Heat exchanger, 9 ... High temperature regenerator, 10 ... Low temperature regenerator, 11 ... Heat source, 12
… Condenser, 13… Solution spray piping, 14,15,16… Switching valve.

Claims (4)

[Claims] 1. An evaporator, an absorber, a high-temperature and low-temperature regenerator, a heat exchanger, a solution pump, a refrigerant pump, and a piping system for operatively connecting them, and the vapor of the high-temperature regenerator through an on-off valve. In an absorption chiller-heater that guides an evaporator to heat hot water for heating and recirculates a concentrated solution obtained by the high-temperature regenerator to an absorber, a discharge side of a refrigerant pump and a pipe that recirculates the concentrated solution. An absorption-type cold temperature, which is connected via an on-off valve and is characterized in that during heating, the refrigerant liquid in the evaporator is diluted by supplying it to the concentrated concentrated solution returned from the regenerator before circulating to the absorber by a refrigerant pump. Water machine. 2. An evaporator, an absorber, a high-temperature and low-temperature regenerator, a heat exchanger, a solution pump, a refrigerant pump, and a piping system for operatively connecting these, and vapor of the high-temperature regenerator through an on-off valve. In an absorption chiller-heater that guides to an evaporator to heat hot water for heating and recirculates the concentrated solution obtained by the high-temperature regenerator to the absorber, the discharge side of the refrigerant pump and the high-temperature regenerator are connected via an on-off valve. The absorption chiller-heater is characterized in that the refrigerant liquid in the evaporator is supplied to the high-temperature regenerator by a refrigerant pump to be diluted during heating. 3. The absorption chiller-heater according to claim 2, wherein the discharge side of the refrigerant pump and the steam generator of the high temperature regenerator are connected via an on-off valve. 4. An evaporator, an absorber, a high-temperature and low-temperature regenerator, a heat exchanger, a solution pump, a refrigerant pump and a piping system for operatively connecting them, and the high-temperature regenerator is vaporized through an on-off valve. In the absorption chiller-heater that guides the heating water to the heater and heats the concentrated solution obtained by the high-temperature regenerator to the absorber, the discharge side of the refrigerant pump and the low-temperature regenerator are opened and closed via an on-off valve. An absorption chiller-heater characterized by being connected and supplying the refrigerant liquid in an evaporator to a low-temperature regenerator by means of a refrigerant pump for dilution during heating.