JPS60117065A - Heat recovery device for absorption cold and hot water machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (a) Industrial Application Field The present invention uses an absorption refrigeration cycle to obtain cold water from the evaporator during cooling, and shuts off the flow of cooling water from the generator during heating. The present invention relates to a heat recovery device for a 5K absorption chiller/heater (hereinafter referred to as this type of absorption chiller/heater) that obtains hot water from an evaporator by condensing refrigerant vapor in the evaporator.

(Naka) Prior art This type of absorption chiller/heater was developed, for example, by the Japanese Patent Publication No. 55-3690.
As explained in Publication No. 0, it is sufficient to use one heat exchanger for both cooling and heating as the load-side heat exchanger, and only one cold/hot water circuit is required, so it is suitable for small household use. It is used in a wide range of applications, from small to large ones for building air conditioning.

However, in this type of absorption chiller/heater, during heating operation, the refrigerant condensed in the evaporator is returned to the absorption liquid in the absorber, and the diluted absorption liquid is boiled again in the generator to separate the refrigerant vapor. ,
Because the separated refrigerant vapor is condensed again in an evaporator, which is called a boiler operation, the heat energy for driving is not used effectively and the thermal efficiency is low.

(c) Object of the Invention The object of the present invention is to provide a heat recovery device that can improve the thermal efficiency of this type of absorption chiller/heater during heating operation.

2) Structure of the Invention The present invention is based on this type of absorption chiller/heater, and uses a heat recovery device to boil the refrigerant condensed in the evaporator and turn it into vapor using the exhaust heat of the heat source fluid during heating operation. The refrigerant is provided in the flow path, and the refrigerant that becomes vapor in the heat recovery device is returned to the evaporator and used for heating hot water.

According to the present invention, heat source energy is effectively utilized by utilizing exhaust heat of the heat source fluid to heat hot water, so thermal efficiency during heating operation can be improved. Furthermore, according to the present invention, the refrigerant condensed in the evaporator is boiled in the heat recovery device to change the phase from liquid to vapor, so the heat transfer coefficient on the refrigerant side in the heat recovery device is approximately 2000 kcal/hr m.
C, the liquid is sieved using the waste heat of the heat source fluid. warm water /
With a total heat recovery pressure of 7 Aj, the heat y on the hot water side in this heat recovery device (flow rate is approximately 1 ooo krA/hr
Φnt QC. ) can recover heat with higher efficiency.

←JU The drawings are schematic 1° one-piece configuration diagrams showing one embodiment of the heat recovery device of the present invention, (1) is a direct-fired high-temperature generator, (2) is a low-temperature generator, (3) is a condenser, (4) is an evaporator, (5) is an absorber, (6) is a low temperature solution heat exchanger, (power is a high temperature solution heat exchanger, (8) is a pump for refrigerant liquid, (9) is a pump for absorption liquid, and these are a pipe a0.00) through which the refrigerant flows, a pipe aυ through which the refrigerant liquid flows, and a pipe through which the refrigerant liquid flows back (one, Q
2. The pipe through which the dilute liquid flows (131, α floor, pipe 04 through which the intermediate liquid flows), 04), and the pipe through which the concentrated liquid flows (α) (151) are connected to form a circulation path for the refrigerant and the absorption liquid. Note that the dilute liquid refers to an absorption liquid with a low absorbent concentration, the concentrated liquid refers to an absorption liquid with a high absorbent concentration, and the intermediate liquid refers to an absorption liquid with an absorbent concentration between that of the dilute liquid and the concentrated liquid.

06) is the combustion heating chamber of the high temperature generator (1), θ force is the burner, (18) j! Heat exchanger for evaporator (4), Q9. (
2υ are coolers for the condenser (3) and absorber (5), respectively, and 01+ is a heater for the low temperature generator (2). In addition, (2 is a heat recovery device, and (2 is a heat supply device for the heat recovery device @.

(2!51.C51 is the cooling water pipe connected in series with the cooler -, 0!1), (25), (2!51. Flowing pipe, (2
6), C! ! Reference numeral 61 denotes a pipe through which combustion exhaust gas flows, which is connected to the heat supply device (c). Also, 0? ) is a refrigerant liquid flow filtration pipe that connects the barrel and the heat recovery device (22), and a refrigerant vapor flow filtration pipe that connects both H pipes 0α and the evaporator (4);
It is a pipe through which cold steam flows, connecting (2 chanting pipe 00) and a heat recovery device (2z. Also, (V,), (V2), (■
3), (V4) are tube α℃, Ofu, shi■, (27
) is the opening/closing valve for the cooling/heating cut-off (+iii) and the refrigerant liquid reservoir in the Qll single evaporator (4).

Next, the absorption cooling r+ of the cooling/heating switching type configured in this way,
Can you briefly explain the operation of the water machine (hereinafter referred to as this machine)?
+'K Explain.

? Tr Futoki K 'r'! , , open the valves (V2) and (V3) and sequentially pass cooling water through the valves (Vl) and (V4), and then open the pipes (
24) The heat exchanger α ~ is operated by passing cold water through the tubes (2).By operating in this manner, an absorption refrigeration cycle is formed by circulating the refrigerant and the absorption liquid, Heat exchanger 08 uses the latent heat of vaporization of the refrigerant liquid distributed to heat exchanger Q81.
The cold water in 1 is lowered in temperature by a load side heat exchanger (not shown).
Supplied to 9 loads 9! U is cooled.

K bt during heating, valves (V2), (V3) Closed valve (V
l), (V4) to cut off the flow of cooling water to the coolers (4) and 4, and then open the pipes (24), heat exchangers (18, and pipes (24)
)K Operate with warm water flowing through it. By operating in this way, the absorption action of the refrigerant by the absorption liquid in the absorber (5) and the condensation action of the refrigerant in the condenser (3) are stopped, and the absorption liquid in the high @ generator (1) is stopped. Separated refrigerant vapor flows into pipe 0
0.00) and to the evaporator (4) via the pipe a[, QO), the condenser (3), and the W(11).

When the refrigerant that has flowed into the evaporator (4) condenses in the heat exchanger (1 barrel), the hot water in the heat exchanger H is heated and supplied to the load side heat exchanger, heating the load side. reactor.

In addition, in this machine, during heating operation, the refrigerant condensed in the evaporator (4) passes from the refrigerant reservoir (2) to the heat recovery device C via the pipe 0, the pump (8), and the pipe Q7Jlη. The refrigerant is heated by the combustion exhaust gas in the heat recovery device, boils, and becomes steam again. It reaches the evaporator (4) and is reused for heating hot water.The absorber (5)
The absorption liquid flowing into the refrigerant reservoir (29) and the refrigerant liquid overflowing from the refrigerant liquid reservoir (29) are returned to the high temperature generator (1) by the pump (9), where the refrigerant vapor is separated again.

5. In this machine, during heating operation, the heat recovery device (
Since the heat of the combustion exhaust gas is used to raise the temperature of hot water through the ribs, the thermal efficiency during heating can be improved and fuel costs can be saved. In addition, in this machine, the refrigerant that recovers the heat of the combustion exhaust gas and raises the temperature of hot water undergoes a phase change from liquid to vapor in the heat recovery device (2'IJ), and the refrigerant side in this heat recovery device Since the flow rate is about 2000 kcal/hr・m′・C,
A heat recovery device that directly recovers the heat of combustion exhaust gas into hot water (the heat transfer coefficient on the hot water side of this heat recovery device is 1000 kral)
/hr-ze・C. ) compared to heat supply c! 3) The heat transfer area can be reduced, and the heat recovery device Q21 can be downsized. Furthermore, since the heat transfer area of the heat feeder f22) can be made small, the degree to which the flow of combustion exhaust gas is deteriorated by this heat feeder is also small, and the combustion state in the combustion heating chamber (IQ) can be maintained in a good condition.

In addition, in this machine, if cooling water is supplied by a pump (not shown) during cooling operation, it is sufficient to stop this pump during heating operation, and it is not necessarily necessary to provide a valve (V3) in the pipe pipe. . Moreover, it is not necessary to necessarily provide a valve (V2). However, if the valve (V2) is not provided, the refrigerant liquid will be sprayed even during heating operation, which will impair heat exchange between the hot water and the refrigerant vapor in the heat exchanger 0 mark, which is not preferable. Furthermore, although not shown, the pipe 0.4) and the lower part of the absorber (5) are connected by a pipe with a switching valve, so that the absorption liquid from which the refrigerant is separated in the high-temperature generator (1) is used during heating operation. The absorber (5) bypasses the solution heat exchanger (power, (6) and the low temperature generator (2)
) K may be allowed to flow in.

(f) Effects of the Invention As described above, the present invention provides an absorption chiller/heater of this type that switches between cooling and heating, by heating hot water during heating operation and boiling the condensed refrigerant using the exhaust heat of the heat source fluid to generate steam. Since the refrigerant that has become vapor is reused to heat hot water, it has the effect of improving thermal efficiency during heating. In addition, in the heat recovery device of the present invention, the refrigerant for recovering waste heat undergoes a phase change to increase the heat transfer coefficient, so that the heat recovery device pressure is sufficient to raise the temperature of the liquid. There is also the advantage that the collection device can be made smaller.

[Brief explanation of the drawing]

The drawing is a schematic structural explanatory diagram showing an embodiment of the device of the present invention. (1)...High temperature generator, (2)...Low temperature generator,
(3)... Condenser, (4)... Evaporator, (5
)...absorber, (6), (7)...solution heat exchanger, (8)...pump, (10), 0(υ, (l cap...tube, Qc)... Combustion 1J1] Heat chamber, (18)・
...Heat exchanger, (22) ...Heat recovery device, +23)
-... Heater, (26), (,7[i), (27),
(281-... pipe, (/!!++... refrigerant reservoir,
(V,), (V2), (static, (V4)...valve.

Claims (1)

[Claims] (1) During cooling, cold water is obtained from the evaporator using an absorption refrigeration cycle, and during heating, the refrigerant vapor separated in the generator is condensed in the evaporator, and sieved water is extracted from the evaporator by 1 In a type of absorption chiller/heater, the refrigerant condensed in the evaporator during heating is evaporated with waste heat fluid from the generator and then returned to the evaporator to be used for heating hot water (as shown in 1). Heat recovery device for absorption chiller/heater.