JPS6018761Y2 - Air conditioning equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to an air conditioning system, and in particular uses hot water obtained from solar heat or waste heat as a heat source for an absorption chiller to supply a medium to a heat exchanger in a fan coil unit for cooling. Or it relates to a heating and cooling device that performs heating.

In this type of air conditioning system, the hot water used as a heat source during heating is at a relatively high temperature, for example, about 50°C.
It was necessary that it be above.

Furthermore, in solar heat collectors, as shown in FIG. 1, it is known that the higher the heat collection temperature, the lower the heat collection efficiency.

In Figure 1, the broken line indicates the heat collection temperature of 10℃ or higher, the dashed line indicates the heat collection temperature of 30℃ or higher, and the solid line indicates the heat collection temperature of 50℃ or higher.
Indicates temperature above ℃.

In this way, with conventional air conditioning systems, it is difficult to perform heating operation when the hot water temperature is below 50°C, and
When performing heating operation using solar heat, there is a drawback that heat collection efficiency is poor.

Therefore, an object of the present invention is to provide a heating and cooling device that can perform heating operation even when the temperature of hot water obtained from solar heat or waste heat becomes low.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is an overall sectional view of an embodiment of the present invention.

For example, in a building 1 such as a dormitory having a plurality of rooms 1a, a fan coil unit 2 is installed in each room 1a.

For example, on the roof of the building 1, there is a heat collector 3 that collects solar heat to obtain hot water, and a tank 4 that stores the hot water obtained from the heat collector 3.
, a single- and double-effect combination absorption chiller 5 and a cooling tower 6 that use hot water from a tank 4 as a heat source are installed.

During cooling, each fan coil unit 2 is supplied with cold water from the conduit 32, and the air blown into the room by the fan 2a of each fan coil unit 2 is cooled by the cold water, thereby providing cooling.

During heating, hot water is supplied from the conduit 32 to each fan coil unit 2, and the hot water warms the air, thereby providing heating.

FIG. 3 is a system diagram of the air-conditioning system in the cooling operation state, where broken lines indicate unused pipes and filled valves indicate the closed state.

The tank 4 and the heat collector 3 are connected by a pipe line 8 and a pipe line 9 including a pump 7 .

Water supplied from the tank 4 to the heat collector 3 by the pump 7 via the pipe line 8 collects solar heat and is returned to the tank 4 via the pipe line 9 at a relatively high temperature, for example, 70° C. or higher.

The hot water of 70°C or higher in this tank 4 is single layer,
It is used as a heat source for the dual-effect combination absorption refrigerator 5.

This single and double effect combination absorption refrigerator 5 has an evaporator 1
0, an absorber 11, a condenser 12, a high-pressure regenerator 13, a low-pressure regenerator 14, a low-temperature regenerator 15, a high-temperature heat exchanger 16, a low-temperature heat exchanger 17, and the like.

A fuel gas such as city gas is supplied to the high-pressure regenerator 13, and its combustion heat is used as a heat source for the high-pressure regenerator 13.

The hot water obtained in the tank 4 is circulated in a hot water circulation circuit that circulates as follows: pipe 24 -> switching valve 23 -> pipe 22 -> pump 50 -> low temperature regenerator 15 - pipe 20 -> switching valve 19 -> pipe 18.

This hot water is used as a heat source for the low temperature regenerator 15.

One end of each fan coil unit 2 for cooling or heating the room by contacting outside air is connected to a conduit 25.
, the switching valve 26, the pipe 27, the switching valve 19, and the pipe 2B to one end of the coil 10a of the evaporator 10.

The other end of the coil 10a is connected to the pipe line 29, the switching valve 34, and the pipe line 3.
0, a pump 31, and a conduit 32 to the other end of each fan coil unit 2.

In this way, water as a cooling medium is transferred from the fan coil unit 2 to the pipe line 25 to the switching valve 26 to the pipe line 27 to the switching valve 1.
9 → Pipe line 28 → Coil 10a → Pipe line 2.9 → Switching valve 34
A cooling medium circulation circuit is configured in which the coolant circulates to the fan coil unit 2 via → pipe 30 → pump 31 → pipe 32.

One end of the coil 33 that is continuously provided in the absorber 11 and the condenser 12 is communicated with the upper part of the cooling tower 6 via a pipe line 35, an on-off valve 40, and a pipe line 36, and is connected to the lower part of the cooling tower 6. is communicated with the other end of the coil 33 via a conduit 37, a switching valve 38, and a conduit 39.

In this way, the coil 33→pipeline 35−opening/closing valve 40→
Pipe line 36 → cooling tower 6 → pipe line 37 → switching valve 38 → pipe line 39
A circulation circuit for cooling water returning to the coil 33 through the cooling water is formed.

In such a state of cooling operation, water as a cooling medium in the cooling medium circulation circuit is cooled by removing heat from it in the evaporator 10, and is cooled to the outside air by the fan coil unit 2, so that the cooling function is far away. be related to

Figure 4 is a system diagram in a heating operation state when relatively high temperature water, for example 4TC or higher, can be obtained from the heat collector 3. Broken lines indicate unused pipes, and filled-in valves are Indicates the valve is closed.

When relatively high-temperature hot water can be obtained from the heat collector 3, the operation of the single- and double-effect combination absorption chiller 5 is stopped and hot water from the tank 4 is supplied to the fan coil unit 2. .

In such a case, the switching valves 26 and 34 in the above-mentioned coolant circulation circuit are switched and the switching valve 19 is shut off to shut off the tank 4 and the coil 10a of the evaporator 10.

Then, the pipe line 30 is connected from the tank 4 to the tank 4 via the pipe line 42, the switching valve 41, and the pipe line 44, and the pipe line 25 is connected to the pipe line 24 via the pipe line 43.

In this way, the hot water in the tank 4 is transferred from the tank 4 to the pipe 42.
→Switching valve 41→Pipeline 44→Switching valve 34→Pipeline 30→Pump 31→Pipeline 32→Fan coil unit 2→W line 25
A heat medium circulation circuit is formed in which the heat medium circulates to the tank 4 via → switching valve 26 → pipe line 43 → switching valve 23 → pipe line 24.

In this way, the hot water from the tank 4 warms the air supplied into the room by the fan 2a in the fan coil unit 2, thereby achieving heating.

Figure 5 shows a system diagram of the heating operation state when the temperature of the hot water obtained from the heat collector 3 is relatively low, for example, in the temperature range from 47°C to about 20-15°C, and the broken lines indicate pipes that are not used. A filled-in valve indicates a closed state.

In this case, the switching valves 19, 23 and 34 are switched to connect the pipe line 18 and the pipe line 28, and the pipe lines 24, 22,
Connect 29.

As a result, the hot water in the tank 4 is transferred from the pipe line 24 to the switching valve 23 → pipe line 22 → pump 50 → switching valve 34 → pipe line 29 →
It is returned to the tank 4 via the coil 10a → pipe line 28 → switching valve 19 → pipe line 18.

Note that the pipes 22 and 28 are connected via a bypass pipe 51, and the opening degree of a control valve 47 provided at a connection position between the bypass pipe 51 and the pipe 22 is determined by detecting the hot water temperature in the coil 10a. A portion of the hot water may be circulated under control.

In addition, the switching valves 26, 38, and 41 are switched to connect the pipe line 35 to the pipe line 44, and the pipe line 44 is connected to the pipe line 30 via a pipe line 45 that bypasses the switching valve 34.

Further, the pipe line 25 is communicated with a pipe line 39 via a pipe line 46.

In this way, water as a heat medium is transferred from the fan coil unit 2 → pipe line 25 → switching valve 26 → pipe line 46 → switching valve 38 →
Pipe line 39 → Coil 33 → Pipe line 35 → Switching valve 41 → Pipe line 4
4 → Bypass line 45 → Line 30 → Pump 31 → Line 3
A heat medium circulation circuit is formed which circulates to the fan coil unit 2 via 2.

With this configuration, the single- and double-effect combination absorption refrigerator 5 functions as a heat pump.

That is, the coil 10a of the evaporator 10 pumps up heat from the hot water from the tank 4, and the coil 3 in the heat medium circulation circuit
In step 3, heat is supplied to water as a heat medium.

The water heated by the coil 33 is radiated by the fan coil unit 2, thereby providing heating.

FIG. 6 is a system diagram in the case where only hot water at a temperature below 10°C, for example, which cannot be used as a heat source for the single- and double-effect combination absorption chiller 5, is obtained in the heat collector 3, and the broken lines are not used. The valves shown are closed, and the valves shown are closed.

In this case, switching the switching valves 19 and 23 from the state shown in FIG. While communicating via the pipe line 43, the pipe line 4
6 and a conduit 28 are communicated via a conduit 27.

By doing this, the fan coil unit 2
A portion of the hot water after dissipating heat in the pipe 25 → switching valve 26 → pipe 43 → switching valve 23 → pipe 22 → pump 50 → switching valve 3
4→Pipe line 294 Coil 10a→Pipe line 28→Switching valve 19→
A bypass circuit for hot water flowing through the pipe 27 and into the pipe 46 is formed.

In this way, a part of the hot water after the heat is radiated by the fan coil unit 2 flows into the coil 10a, and the amount of heat is pumped up by the evaporator 10 of the single- and double-effect combination absorption refrigerator 5.
In addition, the heating operation can be continued, and in some cases, the hot water generated by the high-pressure regenerator 13 may be used as a heat source for the evaporator 10.

In addition, if the pressure of the high pressure regenerator 13 increases excessively during the operation of the heat pump shown in FIGS. Alternatively, the low pressure regenerator 14 may be bypassed via the low pressure regenerator 14.

Further, instead of the heat collector 3, a hot water generating means that generates hot water using exhaust heat from an engine or the like may be used.

As described above, according to the present invention, when the hot water generating means can only obtain relatively low-temperature hot water during heating operation, the hot water is guided to the evaporator of the absorption chiller and the chiller is converted into a heat pump. In addition, if the hot water is at a low temperature that cannot be used as a heat source for the refrigerator, a part of the medium heated by the absorber and condenser of the refrigerator and radiated by the heat exchanger is transferred to the evaporator. Therefore, even at relatively low temperatures, solar heat or waste heat can be effectively utilized for heating operation.

Moreover, since the hot water temperature can be lowered, the efficiency of collecting solar heat is improved.

Furthermore, heating operation can be performed even when solar heat or waste heat cannot be used.

[Brief explanation of drawings]

Fig. 1 is a graph showing the relationship between heat collection temperature and heat collection efficiency in a heat collector, Fig. 2 is an overall sectional view of an embodiment of the present invention, Fig. 3 is a system diagram in a cooling operation state, and Fig. 4 is a graph showing the relationship between heat collection temperature and heat collection efficiency in a heat collector. The figure shows a system diagram when relatively high-temperature hot water is used in a heating state, Figure 5 is a system diagram when relatively low-temperature hot water is used in a heating state, and Figure 6 shows a system diagram when solar heat cannot be used. This is a systematic diagram of the time. 2...Fan coil unit, 3...
Heat collector, 5... Single and double effect combination absorption refrigerator, 1°... Evaporator, 11... Absorber, 12... Condenser.

Claims (1)

[Scope of utility model registration request] In an air-conditioning/heating system that circulates and uses hot water from a hot water generating means using solar heat or waste heat as a heat source for an absorption chiller and supplies a medium to a heat exchanger that exchanges heat with indoor air for cooling or heating. , when in the cooling mode, the medium cooled by the evaporator of the refrigerator is led to the heat exchanger, and in the heating mode, when relatively high-temperature hot water can be obtained by the hot water generating means; The hot water is guided as a heat medium to a heat exchanger, and if the hot water generating means can only obtain relatively low-temperature hot water, the hot water is guided to the evaporator of the absorption chiller to make the chiller function as a heat pump. The medium heated by the absorber and condenser of the absorption chiller is guided to the heat exchanger, and if the hot water obtained by the hot water generating means is too low to be used as a heat source for the absorption chiller, A heating and cooling system characterized in that a part of the medium heated by an absorber and a condenser and radiated by a heat exchanger is used as a heat source for an evaporator.