JPS5831264A - Absorption heat pump - 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] Is the present invention an absorption refrigeration cycle? It relates to a heat pump that is used to supply hot water, hot water, etc. (hereinafter referred to as hot water, etc.) to the outside of the machine.

Generally, in an absorption heat pump, the absorption liquid returned to the regenerator is heated to boiling, separated into refrigerant and absorption liquid, and the vaporized high-temperature refrigerant is fed to the heat condenser, while the condensed liquid refrigerant is sent to the evaporator (- The refrigerant that has obtained the latent heat of vaporization from the heat supplied to the evaporator (subfluid, hereinafter referred to as heat source water) flows to the absorber side, and the absorption liquid becomes the refrigerant. The heat obtained by the refrigerant along with the heat absorbed by the refrigerant is supplied to a heat exchanger.
Hot water, etc. is obtained from a hot water circuit that runs from the absorber to the condenser C.

Therefore, since the amount of refrigerant flowing from the regenerator to the condenser and the amount of refrigerant flowing from the evaporator to the absorber of the absorption heat pump device described in (h) flow in balance, 1. If the conditions change and the refrigerant vaporization in the evaporator changes slightly, the temperature of the hot water obtained from the absorption heat pump will also change, making it difficult to control the supply of hot water, etc. at a constant temperature to the outside of the machine. .

In particular, when solar hot water is used as the heat source water, the water temperature tends to fluctuate due to solar radiation, making it difficult to continuously supply t' crystal water or the like at a constant temperature in combination with an absorption heat pump.

The present invention solves the drawbacks of these conventional absorption heat pumps, and is composed of a regenerator, a low-temperature regenerator, and a high-temperature regenerator, so that hot water at a constant temperature can be obtained relatively stably even when the heat source water temperature fluctuates. However, when the heat source water temperature becomes low, the operation of the low-temperature regenerator is switched to single-effect operation where the operation is stopped, and when the heat source water temperature is above a certain temperature, the operation is switched to dual-effect heat pump operation. And to the evaporator.

The present invention aims to provide an absorption heat pump that can appropriately switch and suspend hot water or the like having different temperature levels when heat source water with little temperature fluctuation can be supplied.

In Figure 1, (1) has a heater (2) that uses a high-temperature heat source such as a gas burner, oil burner, or steam as the total heating source, and the heater (2) heats an absorbing liquid such as an aqueous solution of lytecum bromide. A high-temperature regenerator that vaporizes and separates the refrigerant (water) in the absorption liquid by boiling it, (31 has a heater (4) that serves as a heat source for the high-temperature refrigerant stale in the high-temperature regenerator (1), The heater (4) vaporizes and separates the refrigerant in the absorption liquid, the low mL ladle generator (5) has a heat exchanger (6) that extracts heat from the refrigerant flowing from the regenerator (11 (31), The condenser (7) liquefies and condenses the refrigerant and sends it to the evaporator f7+c. , +101 absorbs the refrigerant vaporized in the evaporator (7) by pumping the concentrated absorption liquid in the regenerator +11 (311-), and absorbs the heat of the refrigerant gas and the reaction heat when the refrigerant gas is absorbed by the absorption liquid. +121 is a refrigerant pump that circulates un-vaporized cold J4Y in the evaporator (7) and distributes it; u3 is a regenerator ( 1) Absorbent pump that returns to (1 nail P)
1 low-temperature heat converter that exchanges heat with the absorption liquid and diluted liquid flowing into the absorber (10) from the generator full 31; 7
It is a high-temperature heat exchanger that exchanges heat with the replacement liquid described by TJ. Replacement fluid tube (
c) and diluted liquid side pipe (b), on-off valve +25), 12 (i
)Y, the intermediate liquid pipe ta and the intermediate liquid side pipe (2& etc. are connected to form an absorption refrigeration cycle, and the heat exchanger u1J (6) built in the absorber and condenser flows in series ( It consists of 2 parts, so that 2 parts of hot water can be obtained from 2 parts.

In addition, due to the above opening/closing valve surface (I211Q wholesale ω (20 is the temperature detector C30 that detects the temperature change at the inlet of the heat source water),
Or.

Opening/closing control as described later is performed from the controller 6j) 32, which receives the temperature at the inlet and outlet of the heat source water from the temperature detector 110) + 1lO) as an input signal, and The control is adjusted by the fuel control valve (3) whose opening is adjusted by input signals from the temperature detector (53) installed in the hot water pipe (2).

When solar hot water is supplied as heat source water to the evaporator (7) of an absorption heat pump having such a configuration, when the temperature of this heat source water is high (for example, 25° C. or higher).

The on-off valve Q51 is closed, and the on-off valve QI23+26) is opened.

The refrigerant gas generated in the high temperature regenerator (1) is passed through the refrigerant pipe (1G,
The absorbing liquid flows into the condenser (5) via the heater (4) of the low-temperature regenerator and the on-off valve ti1, while the refrigerant gas is separated from the absorption liquid in the high-temperature internal generator (1) and the low-temperature generator 131. , is operated as a dual-effect absorption heat pump, and the Dueling diagram of ritewam bromide shown in Fig. 2 A-B-0-D-E-
As seen in the F-A cycle, it is possible to store crystal water at a temperature of 11 degrees (indicated by diagonal lines in the figure, e.g. after cutting at 50 degrees Celsius), and it is difficult to collect it under such conditions. To control the hot water temperature, conventionally known operation control of an absorption heat pump, such as heating control in the high temperature regenerator (1), is used.

When the heat source water temperature becomes low (for example, below 25℃),
The refrigerant vaporization and circulation in the evaporator (7) decrease, the concentration of the absorption liquid increases, and the internal pressure of the low-temperature regenerator (3) also decreases. You will not be able to use the hanger. At times like this.

Decrease in temperature of heat source water - Temperature detector (column or C (detected by Ol, open/close valve f17) 121R251 is opened, open/close valve t
+a12 (when Niji 0 is closed, the refrigerant gas in the high-temperature regenerator full flows through the refrigerant side pipe +20).

It flows into the condenser (5) through the on-off valve r1nv.
), so that even if the heat source water temperature is low, the hot water at the set temperature can be fully pumped. The dilute absorption liquid in the absorber (1111) flows into the absorber (1111) through the exchanger (d41), and returns to the high-temperature generator (1) through the absorption liquid pump (13, low temperature M exchanger 11-11, on-off valve 1211). Circulation (second
The operation and operation opening side 1 are carried out in the heavy-effect absorption heat bomb of -A-8-0-D +7) cycle in the figure.

Above all, in the present invention, the temperature of the heat source water is high.

When the temperature difference between the hot water and the hot water is more than a certain temperature.

By operating a dual-effect heat pump that operates a low secondary generator and a high-temperature stopper, the whirlpool water hanger efficiently maintains the set temperature.On the other hand, the heat source water temperature jW is kept low and the temperature difference between the temperature and the hot water is reduced. When the temperature is above a certain level, the production of low-temperature generators will be suspended.
By operating the double-effect heat pump with the heating temperature rJ]q raised, hot water Z at the set temperature is extracted, and a stable supply of hot water, etc. can be achieved without large fluctuations in the temperature of the hot water being drawn due to fluctuations in the temperature of the heat source water. That's what I do.

In addition, as another embodiment of the present invention, when heat source water V, underground water, or well 7j (fx, etc.) can be used, the on-off valve 7 is switched by a controller when heat source water with a relatively stable temperature can be used. Hot water in two temperature ranges, such as double-temperature hot water and medium-temperature hot water, can be appropriately produced using an absorption heat pump.

In other words, when the heat source water temperature is, for example, 18°C and the difference between this heat source water temperature and the hot water temperature taken out is relatively small, about 50°C, the temperature is set to 18°C, and the difference between the heat source water temperature and the hot water temperature taken out is relatively small, about 50°C. , ^-m-o-6-m- in Figure 6
After a cycle like p-^, hot water with a set temperature jy as shown by diagonal lines in the figure is produced. Father, when making hot water 2 at around 70 degrees Celsius, there is a large difference between the heat source water temperature and the hot water temperature taken out.

Single-effect operation by switching the on-off valve (cycle A- in Figure 6)
B-0-D-A) Produce hot water at a set temperature as indicated by double hatching in the figure.

In this case, the temperature of the hot water taken out can be changed by using a temperature detector installed at the outlet of the hot water pipe, or by operating the control device and switching the on-off valve. The heat pump operation is switched.

With a simple configuration, it is possible to efficiently produce hot water at a stable temperature by utilizing heat source water at a wide range of temperatures.

[Brief explanation of drawings]

'Figure 1 is a refrigeration cycle diagram showing one embodiment of the absorption heat pump according to the present invention, Figure 2 is a Dueling diagram explaining one operating state of the heat pump of the present invention, and Figure 3 is a diagram showing another operating state. It is a Duering diagram for explanation. 1 - high temperature regenerator, 6 - low temperature regenerator, 5 - condenser, 7 - evaporator, 10 - absorber, 17.18% 21° 22.25.
26~opening/closing valve, 29~hot water pipe. Figure 1

Claims (1)

[Claims] (1) In an absorption heat pump that configures an absorption refrigeration cycle with an evaporator, absorber, condenser, and regenerator, the regenerator is a high-temperature regenerator and a low-temperature regenerator that uses the refrigerant gas generated in the high-temperature regenerator as a heating source. and a switching valve is provided in the refrigerant pipe and the absorption liquid supply pipe to the low-temperature aging device, and when the temperature difference between the heat source water supplied to the evaporator and the discharged hot water is above a certain temperature. When the temperature difference between the heat source water temperature and the hot water taken out is below a certain temperature, the low temperature regenerator and the high temperature regenerator are activated. An absorption heat pump characterized by a switchable switching valve.