JP2002130784A - Ventilation system using exhaust heat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ventilation system using exhaust heat for assisting air conditioning of a building, by using a heat pump water heater. SOLUTION: A heat exchanger 1 for performing heat exchange with indoor air, when outdoor air is taken in an indoor space and the heat pump water heater 3 equipped with a heat pump outdoor unit 3a and a hot water reservoir tank 3b are provided. An air intake port 4 is provided in an exhaust port 3e of the heat pump outdoor unit 3a, and an outdoor intake pipe 5 connecting the air intake port 4 and an air supply port after heat exchange in the heat exchanger 1 is provided. During summer, a damper 6, provided in the outdoor air intake pipe 5, is opened and a damper 2 provided in a heat exchange passage guiding outdoor air into the indoor space is closed so that the outdoor air taken in through an outdoor air intake port 3d, cooled and discharged through the exhaust port 3e is guided into the air supply port, after heat exchange in the heat exchanger 1 and supplied to each room.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation system utilizing waste heat to assist air conditioning in a building.

[0002]

2. Description of the Related Art Heretofore, there has been known a heat exchanger type ventilation system for exchanging heat with room air when taking outside air into a room. This ventilation system transfers the heat of indoor warm air to fresh outside air taken in from outside in winter, and creates warm indoor air supply.In summer, the indoor low temperature moves to fresh outside air taken in from outside. In this case, low-temperature indoor air supply is used, which greatly contributes to energy saving. In addition, a method of cooling the outside air in the summer season using the underground temperature to supply air to the room (so-called,
Cool tubes) can also greatly contribute to energy savings.

[0003]

However, the heat exchanger type ventilation system described above is effective when the temperature difference between indoor and outdoor is large, but when the temperature difference is not so large as in summer, for example, Room temperature 27 when outside air temperature is 30 ° C
If the temperature difference of 3 ° C. is 3 ° C., even if the heat exchange rate is 70%, the outside air temperature (room supply air temperature) after the heat exchange is 27.9 ° C.
However, no significant effect can be expected. In addition, the cool tube can stably supply air to the room by keeping the outside air at a constant temperature, but has the disadvantage that the construction is large and dew condensation easily occurs in the tube.

[0004] A heat pump water heater is known as a water heater. Such a heat pump water heater executes a cycle of compressing, condensing, expanding, and evaporating the refrigerant, using the heat of the condensate for hot water supply, removing the heat of the outside air in the evaporation, and converting the cool air generated by this heat exchange into the atmosphere. Has released.

[0005] In view of the above circumstances, an object of the present invention is to provide a ventilation system utilizing waste heat for assisting air conditioning of a building by using a heat pump water heater.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a ventilating system utilizing exhaust heat according to the present invention includes a heat exchanger for exchanging heat with room air when taking in outside air into a room. A heat pump water heater comprising a heat pump outdoor unit and a hot water storage tank, and a post-heat exchange air supply unit in the heat exchanger for supplying outside air taken from an outside air intake of the heat pump outdoor unit and cooled by an evaporator. Leads to
The air supply unit after the heat exchange is configured to be discharged into the indoor space of the building as the indoor air supply, and the cooling air from the heat pump outdoor unit is guided to the air supply unit after the heat exchange in the heat exchanger. Is provided, and a second ventilation valve is provided in a heat exchange path for guiding outside air into a room.

[0007] With the above structure, the first ventilation valve is opened and the second ventilation valve is closed in summer, so that the cooling outside air from the outdoor unit of the heat pump can exchange heat with the heat exchanger. The air is supplied to the rear air supply unit, and is discharged from the air supply unit after the heat exchange to the indoor space of the building as indoor air supply. That is, conventionally, the cool air generated by the heat exchange of the heat pump is released into the atmosphere, but the cool air can be guided into the room to assist the air conditioning of the building. Also,
Since the air is led into the room via the heat exchanger, the cooling air from the heat pump can be independently provided in each room.

Further, the exhaust heat utilizing ventilation system according to the present invention has a heat exchanger for exchanging heat with indoor air when taking in outside air into a room, a heat pump outdoor unit and a hot water storage tank. And an exhaust supply path that guides exhaust gas from the exhaust unit after heat exchange in the heat exchanger to the space around the evaporator in the heat pump outdoor unit, and a ventilation valve provided in the exhaust supply path. And

With the above configuration, by opening the ventilation valve in the winter season, the exhaust from the exhaust unit after heat exchange, which is warmer than the outside air, can be guided to the heat pump outdoor unit. Can be used effectively to improve the coefficient of performance of the heat pump water heater.

In the above-mentioned ventilation system utilizing waste heat, the outside air taken in from the outside air intake of the outdoor unit of the heat pump and cooled by the evaporator is led to the air supply section after heat exchange in the heat exchanger, and the heat exchange is performed. While being configured to be discharged from the rear air supply section to the indoor space of the building as indoor air supply,
A first ventilation valve is provided on a path for guiding cooling outside air from the heat pump outdoor unit to the air supply unit after heat exchange in the heat exchanger,
A second ventilation valve may be provided in a heat exchange path for guiding outside air into a room, and both the ventilation valve provided in the exhaust supply path and the first ventilation valve may not be simultaneously opened.

According to this, the inside of the room is cooled by the cooling air from the outdoor unit of the heat pump in the summer, and the coefficient of performance of the heat pump water heater is improved by utilizing the exhaust from the exhaust unit after the heat exchange in the winter. be able to. If the ventilation valve provided in the exhaust gas supply path and the first ventilation valve are both opened at the same time, the indoor exhaust air will be introduced again into the room, but both will not be opened. ,
Such a situation does not occur.

Further, the exhaust heat utilization ventilation system according to the present invention provides a heat pump hot water supply comprising a heat exchanger for exchanging heat with room air when taking in outside air into a room, a heat pump outdoor unit and a hot water storage tank. And an exhaust supply path that guides exhaust gas from the exhaust unit after heat exchange in the heat exchanger to the space around the evaporator in the heat pump outdoor unit, and connects heat collection air from a solar hot air collector to the exhaust supply path. And a ventilation valve provided in the exhaust gas supply path.

With the above configuration, the collected air from the solar air collector is led to the outdoor unit of the heat pump throughout the year, thereby helping to improve the coefficient of performance of the heat pump water heater. In, the exhaust from the exhaust unit after heat exchange, which can be expected to have a higher temperature than the collected air from the solar air collector, is guided to the heat pump outdoor unit, and the coefficient of performance of the heat pump water heater can be further improved. .

In the exhaust heat utilization ventilation system including the solar heat air collector, the outside air taken in from the outside air intake of the heat pump outdoor unit and cooled by the evaporator is supplied after the heat exchange in the heat exchanger. The heat-exchange air supply unit is configured to discharge the heat-exchanged air from the heat pump outdoor unit to the post-heat-exchange air supply unit in the heat exchanger. A first ventilation valve is provided in the guide path, a second ventilation valve is provided in the heat exchange path that guides outside air into the room, and both the ventilation valve provided in the exhaust supply path and the first ventilation valve are simultaneously opened. It may be configured not to be.

According to this, the collected air from the solar hot air collector is guided to the heat pump outdoor unit throughout the year, thereby helping to improve the coefficient of performance of the heat pump water heater and cooling the outside air from the heat pump outdoor unit in summer. In the absence of solar radiation in winter or at night, the coefficient of performance of the heat pump water heater can be further improved by utilizing exhaust air from the exhaust unit after heat exchange.
If the ventilation valve provided in the exhaust gas supply path and the first ventilation valve are both opened at the same time, the indoor exhaust air will be introduced again into the room, but both will not be opened. Such a situation does not occur.

In the above-mentioned ventilation system utilizing exhaust heat, a switching valve is provided for switching between a space in which the blower fan is arranged in the heat pump outdoor unit and the outside air space or a manner in which the space in which the blower fan is arranged is communicated with the exhaust gas supply path. Is desirable.

If the collected air from the solar air collector is guided to the heat pump outdoor unit even in the hot summer season, a low temperature may not be expected as cooling air from the heat pump outdoor unit required in the summer. By providing the switching valve, it is possible to select a state in which the fan arrangement space of the heat pump outdoor unit communicates with the outside air space in the summer to obtain low-temperature cooling outside air from the heat pump outdoor unit.

The ventilation valve may be automatically opened and closed based on temperature information by a temperature sensor and / or current date and time information by a calendar function. The ventilation valve may be switched manually by a resident of the building. However, by adopting a configuration that automatically opens and closes, a system malfunction due to forgetting to operate can be avoided.

[0019]

Embodiment 1 Hereinafter, an embodiment of the present invention will be described with reference to FIG.

FIG. 1 is an explanatory diagram showing the configuration of a ventilation system utilizing waste heat. The heat exchanger 1 has a discharge fan 1a that takes in indoor exhaust and discharges it outside, an air supply fan 1b that takes in outside air and guides it indoors, and a heat exchange unit 1c. Heat is exchanged between them. The outside air taken into the heat exchanger 1 and subjected to heat exchange is guided to each room by piping (not shown). A damper (ventilation valve) 2 is provided in a heat exchange path that guides outside air into the room. When the damper 2 is closed, outside air is not taken in by the outside air intake of the heat exchanger 1.

The heat pump water heater 3 includes a heat pump outdoor unit 3a and a hot water storage tank 3b. Outdoor unit 3a
Performs a cycle of compressing, condensing, expanding, and evaporating the refrigerant, giving heat of condensation to the water supplied from the hot water storage tank 3b to warm it, and removing the heat of the outside air taken in from the outside air intake 3d during evaporation, and Cool air generated by the replacement is blown out of the outdoor unit 3a from the exhaust port 3e by the fan 3c.

An air inlet 4 is provided at the exhaust port 3e. The air inlet 4 is connected to a post-heat exchange air supply unit in the heat exchanger 1 by an outside air intake pipe 5. A damper (ventilation valve) 6 is provided in the outside air intake pipe 5. When the damper 6 is opened, the cool air discharged from the heat pump outdoor unit 3a is guided to the air supply unit after heat exchange by the suction force of the air supply fan 1b.

When the damper 2 is open, the damper 6 is closed, and when the damper 2 is closed, the damper 6 is open. The opening and closing of the dampers 2 and 6 may be manually operated by the occupants, or
If an interlocking opening / closing device is adopted as 6, a manual operation for one damper is sufficient. Also, damper 2
6 may be driven by an actuator such as a motor or a solenoid, and the operation may be performed by a power switch. Furthermore, a temperature sensor not shown (detects the outside air temperature)
The power supply to the actuator may be controlled based on the temperature information and / or the current date and time information by the calendar function to automatically open and close the dampers 2 and 6.

With this configuration, the damper 6 is opened during the summer (for example, from July to September), and the damper 2 is opened.
Is closed, cooling outside air from the heat pump outdoor unit 3a is guided to the air supply unit after heat exchange in the heat exchanger 1, and is discharged from the air supply unit after the heat exchange to the indoor space of the building as indoor air supply. Will be done. That is, conventionally, the cool air generated by the heat exchange of the heat pump 3 is released into the atmosphere, but the cool air can be guided into the room to assist the air conditioning of the building. Further, since the cooling air from the heat pump 3 is guided to the room via the heat exchanger 1, a piping path for independently guiding the cooling air from the heat pump 3 to each room can be eliminated.

Embodiment 2 Hereinafter, an embodiment of the present invention will be described with reference to FIG. Note that, to avoid redundancy due to duplication of description, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

FIG. 2 is an explanatory diagram showing the configuration of the exhaust heat utilization ventilation system. The exhaust heat utilization ventilation system has an exhaust supply pipe 7 for guiding exhaust air from the exhaust unit after heat exchange in the heat exchanger 1 to the outside air intake 3d of the heat pump outdoor unit 3a. A passage switching box 9 is provided in the outside air intake section 3d. By operating a switching valve 10 provided in this box, outside air is guided into the outdoor unit 3a or the outside air supply pipe 7 is Whether to guide air into the outdoor unit 3a can be selected.

The heat-collected air generated by the solar-heat-air collector 11 is led to a heat-collecting supply pipe 12. Heat collection supply pipe 1
Numeral 2 is connected to the exhaust gas supply pipe 7, and a common path for guiding air into the outdoor unit 3a is achieved. A fan 13 is provided in the exhaust supply pipe 7 on the downstream side of the connecting portion, and the fan 13 generates heat from the exhaust air after heat exchange in the heat-collected air generated in the solar air collector 11 or the heat exchanger 1. Exhaust gas is introduced into the flow path switching box 9.

In the exhaust supply pipe 7 upstream of the connection section,
A damper (ventilation valve) 8 is provided. The damper 8 is opened during the winter season (for example, from January to March). On the other hand, the damper 6 provided in the outside air intake pipe 5 is opened during the summer (for example, from July to September). The damper 8 and the damper 6 are both closed (in the fall / spring season), but cannot be opened together.
This is to prevent the exhaust from the room from being supplied to the room again. The opening and closing of the damper 8 may be manually operated by a resident, or may be driven by an actuator such as a motor or a solenoid, and the operation may be performed by a power switch. Further, a temperature sensor (not shown) (outside air temperature, collected air temperature, exhaust temperature after heat exchange,
Temperature information by detecting the difference between the temperature of the collected air and the exhaust temperature after heat exchange), the information of the optical sensor that detects solar radiation, and / or the current date and time information by the calendar function (not only
The power supply to the actuator may be controlled based on the time information indicating nighttime, and the damper 8 may be automatically opened and closed. A damper may also be provided on the heat collection and supply pipe 12, and an interlocking mechanism may be provided that closes the damper when the damper 8 is open and opens the damper 8 when the damper 8 is closed.

With this configuration, the collected air from the solar air collector 11 is supplied to the heat pump outdoor unit 3 throughout the year.
By leading to a, the heat pump water heater 3 can be used to improve the coefficient of performance, and at the time of winter or at night or when there is no solar radiation, after heat exchange, which can be expected to be higher in temperature than the collected air from the solar air collector 11. The exhaust gas from the exhaust section is led to the heat pump outdoor unit 3a, and the heat pump water heater 3
Can be further improved. Also,
As in the first embodiment, by setting the damper 6 to the open state and the damper 2 to the closed state in summer, the cooling outside air from the heat pump outdoor unit 3a is guided to the post-heat exchange air supply unit in the heat exchanger 1. After the heat exchange, the air is discharged from the air supply unit to the indoor space of the building as indoor air supply.

By the way, even in the hot summer season, the collected air from the solar air collector 11 is supplied to the heat pump outdoor unit 3.
In this case, it may not be possible to expect a low temperature as cooling outside air from the heat pump outdoor unit 3a required in summer. In this embodiment, by operating the switching valve 10 provided in the flow path switching box 9 and selecting to guide the outside air into the outdoor unit 3a at the time of extremely hot summer, the low-temperature outside air is supplied from the heat pump outdoor unit 3a. Can be acquired.

The switching of the switching valve 10 may be manually operated by the occupant, or may be driven by an actuator such as a motor or a solenoid, and the operation may be performed by a power switch. Furthermore,
Temperature information by a temperature sensor (not shown) (detecting the outside air temperature, the temperature of the collected air, the temperature in the outside air intake pipe 5, etc.) and / or
Alternatively, power supply to the actuator is controlled based on current date and time information (time information indicating daytime as well as month and day is also useful) by a calendar function, and the switching valve 10 is automatically turned on.
May be performed.

Further, an air-conditioning indoor unit may be provided to supply air from the heat exchanger 1 to the air-conditioning indoor unit. When the damper 6 is opened, the outdoor unit 3a is
An operation mechanism that completely covers the exhaust port 3e of the outdoor unit 3a and completely removes the air intake port 4 from the exhaust port 3e of the outdoor unit 3a when the damper 6 is closed may be provided.

[0033]

As described above, according to the present invention, the air conditioning of the building can be effectively assisted by using the heat pump water heater, and the heat pump water heater can be effectively utilized by utilizing the exhaust air after the heat exchange. Can be improved. In addition, even in a system configuration in which a solar hot air collector is integrated, there is an effect that the air conditioning effect using the heat pump water heater can be improved and the coefficient of performance of the heat pump water heater using exhaust after heat exchange can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a ventilation system utilizing waste heat according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a ventilation system utilizing waste heat according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Damper 3 Heat pump water heater 3a Heat pump outdoor unit 3b Hot water storage tank 4 Air intake 5 External air intake piping 6 Damper 7 Exhaust supply piping 8 Damper 9 Flow path switching box 10 Switching valve 11 Solar heat air collector 12 Collection Heat supply piping

Claims (7)

[Claims] A heat exchanger for exchanging heat with indoor air when taking in outside air into a room; a heat pump water heater including a heat pump outdoor unit and a hot water storage tank; The outside air taken in from the outside air inlet and cooled by the evaporator is guided to the post-heat exchange air supply unit in the heat exchanger, and is discharged from the air supply unit after the heat exchange to the indoor space of the building as indoor air supply. And a first ventilation valve is provided in a path for guiding cooling outside air from the heat pump outdoor unit to the air supply section after heat exchange in the heat exchanger, and a second ventilation valve is provided in a heat exchange path for guiding outside air into the room. A ventilation system utilizing waste heat, characterized by having a ventilation system. 2. A heat exchanger for exchanging heat with indoor air when taking in outside air into a room, a heat pump water heater including a heat pump outdoor unit and a hot water storage tank, and heat exchange in the heat exchanger. An exhaust heat utilization ventilation system comprising: an exhaust supply path that guides exhaust from a rear exhaust section to a space around an evaporator in a heat pump outdoor unit; and a ventilation valve provided in the exhaust supply path. 3. The exhaust heat utilization ventilation system according to claim 2, wherein the external air taken in from an external air intake of the heat pump outdoor unit and cooled by an evaporator is supplied to the heat exchanger after heat exchange in the heat exchanger. And a path for guiding cooling outside air from the heat pump outdoor unit to the post-heat exchange air supply unit in the heat exchanger, while discharging the air from the air supply unit after the heat exchange to the indoor space of the building as indoor air supply. A first ventilation valve, a second ventilation valve is provided in a heat exchange path for guiding outside air into the room, and both the ventilation valve provided in the exhaust supply path and the first ventilation valve are not simultaneously opened. A ventilation system utilizing waste heat, characterized in that: 4. A heat exchanger for exchanging heat with indoor air when taking in outside air into a room, a heat pump water heater including a heat pump outdoor unit and a hot water storage tank, and heat exchange in the heat exchanger. An exhaust supply path that guides exhaust air from the rear exhaust unit to a space around the evaporator in the heat pump outdoor unit, a heat collection supply path that connects heat collection air from a solar heat air collector to the exhaust supply path, A ventilation system utilizing exhaust heat, comprising: a ventilation valve provided in a path. 5. The exhaust heat utilization ventilation system according to claim 4, wherein the external air taken in from an external air intake of the heat pump outdoor unit and cooled by an evaporator is supplied to the heat exchanger after heat exchange. And a path for guiding cooling outside air from the heat pump outdoor unit to the post-heat exchange air supply unit in the heat exchanger, while discharging the air from the air supply unit after the heat exchange to the indoor space of the building as indoor air supply. A first ventilation valve, a second ventilation valve is provided in a heat exchange path for guiding outside air into the room, and both the ventilation valve provided in the exhaust supply path and the first ventilation valve are not simultaneously opened. A ventilation system utilizing waste heat, characterized in that: 6. The exhaust heat utilizing ventilation system according to claim 5, wherein whether the air supply fan space of the heat pump outdoor unit communicates with the outside air space or the air supply fan space and the exhaust gas supply path communicate with each other. A ventilation system utilizing exhaust heat, characterized by having a switching valve for switching. 7. The ventilation system according to claim 1, wherein the ventilation valve is automatically opened and closed based on temperature information by a temperature sensor and / or current date and time information by a calendar function. The exhaust heat utilization ventilation system characterized by having comprised so that it might be.