JPH0221487B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a heat recovery type ventilation system used in houses and the like.

[Background technology]

In general, indoor ventilation is carried out using a ventilation fan built into the wall or window of a house, a heat recovery ventilation fan, a floor-standing dehumidifier that uses a heat pump, or an air conditioner (for example, Japanese Patent Application Laid-open No. 107757/1983). Ta.

However, when providing dehumidification and circulation functions in addition to ventilation, multiple devices with each function were required, resulting in an increase in installation space and an increase in price.

[Purpose of the invention]

An object of the present invention is to provide a ventilation system capable of heat recovery ventilation, dehumidification, and circulation, as well as a ventilation system capable of reducing running costs.

[Disclosure of the Invention] The ventilation system of the present invention includes a condenser in one of the two ventilation ports for intake and exhaust.
A ventilating device in which an evaporator is installed on the other side, a blower is installed in at least one of these communication ports, and the condenser and evaporator are connected by refrigerant piping of a heat pump including a compressor and an expansion valve, Two conduction ports are connected via a dehumidification circuit duct, an opening/closing damper is attached to the dehumidification circuit duct, and a lid for opening/closing is provided at the outdoor opening of the two conduction ports. This is a characteristic feature.

Another ventilation device of the present invention includes a condenser installed in one of two ventilation ports for intake and exhaust, and an evaporator installed in the other, and a blower provided in at least one of these ventilation ports. and a ventilation device in which the condenser and the evaporator are connected by a refrigerant pipe of a heat pump including a compressor and an expansion valve, the refrigerant pipe having a valve that bypasses the expansion valve, and a valve that allows refrigerant to flow into the compressor. The present invention is characterized in that it includes a valve that opens and closes, and a valve that opens and closes the outflow of refrigerant from the compressor.

[Effect]

According to the ventilation system of the present invention, the two conduction ports are connected via the dehumidification circuit duct, the opening/closing damper is installed in the dehumidification circuit duct, and the two
Since a lid for opening and closing is provided on the outdoor side opening of the two ventilation ports, in addition to heat recovery ventilation, dehumidification and circulation functions can be performed with a single device.
The device itself is also inexpensive and compact, making it possible to save space.

According to another ventilation device of the present invention, the refrigerant piping includes a valve that bypasses the expansion valve, a valve that opens and closes the inflow of refrigerant to the compressor, and a valve that opens and closes the outflow of the refrigerant from the compressor. With this provision, the operation of the heat pump can be stopped and a part of the heat pump's refrigerant circuit can be used as a heat pipe, making it possible to perform economical heat recovery ventilation with low running costs depending on the ventilation load.

A first embodiment of this invention will be described based on FIGS. 1 and 2. FIG. 1 is an explanatory diagram showing the ventilation state in this embodiment, and FIG. 2 is an explanatory diagram showing the dehumidification or circulation state.

In FIG. 1, reference numeral 20 denotes a heat recovery type ventilation device with a dehumidifying function of this embodiment, which is attached to an outer wall or a window 16. 23 indicates indoors, and 24 indicates outdoors. In addition, 1 is the compressor of the heat pump, 2 is the condenser built into the intake port 21 during the heating period (in the cooling period, it becomes the exhaust port by reversing the fan 7), and 3 is the air condenser. The pillar reach tube (expansion valve) 4 is an evaporator built into the exhaust gas passage 22 (which becomes the intake air passage during the cooling period) of the heater. 5 is a bypass valve for the capillary reach tube, 7 is a fan that can change the direction of air flow by switching between forward and reverse rotation, 8 is a heat pump refrigerant pipe, 9 and 10 are a condensation water receiver and a drain pipe, 11 and 13 are the outdoor air intake and exhaust ports, 12 and 1
4 is an air intake/exhaust port on the indoor side. 15 and 15' are dampers that open and close the dehumidifying circuit duct 17 connecting the intake air passage 21 and the exhaust air passage 22.

Next, the operation of this embodiment will be explained. Figure 1 shows the operation of performing ventilation while recovering exhaust heat. By closing the dehumidifying circuit duct 17 with the dampers 15 and 15', the intake and exhaust communication ports 21 and 22 can be brought into a ventilated state. In other words, during the heating period, the blower 7 is rotated in the normal direction, and fresh outside air is taken into the room 23 through the air flow from the outdoor suction port 11 → the intake air conduit 21 → the indoor air outlet 12, while the indoor exhaust port 14 → Dirty air inside the room 23 is discharged to the outside 24 through the flow of air from the exhaust ventilation port 22 to the outdoor exhaust port 13. At this time, by operating the compressor 1 of the heat pump, exhaust heat from the room 23 can be used as a heat source for the evaporator 4 in the exhaust gas passage 22. In other words, the bypass valve 5 is closed and the heat pump refrigerant circuit is configured as compressor 1 → condenser 2 → capillary reach tube 3 → evaporator 4 → compressor 1, and exhaust heat from indoor 23 is transferred to evaporator 4. The cold air from the outside 24 is then heated by the condenser 2.

During the cooling period, the blower 7 is reversed to reverse the flow of air through the intake port 21 and the exhaust port 22. As a result, contrary to the above, the indoor air outlet 12
→Intake ventilation port 21→Dirty indoor air is discharged to the outside 24 through the air flow from the outdoor intake port 11,
Outside air is taken into the room 23 through the flow of the outdoor exhaust port 13→exhaust ventilation port 22→indoor exhaust port 14. At this time as well, by closing the bypass valve 5 and configuring the heat pump refrigerant circuit as in the heating period,
The condenser 2 picks up heat from the cold exhaust air in the room 23, and the evaporator 4 cools the outside air before sending it into the room. In other words, by picking up heat from the exhaust air from the room 23, the temperature of the intake air taken into the room 23 is lowered and the heat of ventilation is effectively used.

In this way, by using a heat pump in the ventilation fan of a house, the exhaust heat from a warm room is used to heat the outside air that is brought into the room during heating, and the heat from the outside air is released into the exhaust heat from a cold room when cooling. This allows the outside air to be cooled and brought into the room. Furthermore, in contrast to conventional heat exchange elements, whose heat recovery efficiency is significantly reduced due to frost, dew condensation, and icing in the winter, this example operates using warm indoor air as a heat source, so frost, dew condensation, and icing occur. The advantage is that the heat recovery efficiency is high even in winter. Furthermore, heat pumps can be used during the heating season, unlike ordinary air conditioners, which take heat from the cold outside air to warm the indoor air, or air conditioners, which pick up heat from the warm outside air and cool the indoor air. Heat pumps operate in accordance with the basics of heat transfer, such as taking heat from warm air to warm cold intake air from outside, and during the cooling period, pick up heat to the cold indoor exhaust and cool the intake of warm outside air. Another advantage is that the coefficient is significantly increased and heat recovery efficiency is high.

FIG. 2 shows the dehumidification state in this embodiment, in which the dampers 15 and 15' that were blocking the openings at both ends of the dehumidification circuit duct 17 are opened and rotated approximately 90 degrees to open the outdoor suction port 11 and Close the outdoor exhaust port 13. In this state, rotate the fan 7 in the normal direction to connect the air circulation circuit of the indoor room 23 → indoor exhaust port 14 → exhaust ventilation port 22 → dehumidification circuit duct 17 → intake ventilation port 21 → indoor air outlet 12 → indoor air circulation circuit 23. The heat pump is operated in the same manner as described above with the bypass valve 5 closed. For this reason, like a conventional heat pump dehumidifier, air that has been condensed and dried in the evaporator 4 is heated to room temperature in the condenser 2, and then heated again to the indoor air outlet 1.
You can return it indoors from 2. The condensed water is discharged outside from the drain pipe 10 via the condensed water tray 9.

Furthermore, if the operation of the heat pump is stopped while the dampers 15, 15' and the fan 7 remain in the dehumidifying circuit described above, it can be used as a circulator for indoor air.

As described above, according to this embodiment, heat recovery ventilation can be performed with high efficiency, and the damper 15,
By switching 15', dehumidification and circulation functions can also be added to one device. As a result, it is possible to provide a multi-functional, inexpensive and compact ventilation device, making it possible to effectively utilize indoor space.

A second embodiment of the invention will be described based on FIG. In other words, this ventilation system enables heat recovery ventilation in a state where the compressor 1 is stopped without using the heat pump. 5 and the evaporator 4 as a heat pipe to perform exhaust heat recovery ventilation.

As shown in FIG. 3, the ventilation system of this embodiment includes a valve 19 between the evaporator 4 and the compressor 1, which opens and closes the inflow of refrigerant into the compressor 1, and a valve 19 between the evaporator 4 and the compressor 1, and a valve 19 between the compressor 1 and the condenser 2.
A valve 18 for opening and closing the outflow of refrigerant from the compressor 1 is provided between the compressor 1 and the compressor 1, respectively, and the other configurations are the same as those of the previous embodiment.

In addition, as another component of this embodiment, the condenser 2 and the evaporator 4 are arranged so that when the compressor 1 is stopped, the refrigerant flows by gravity from the condenser 2 to the evaporator 4 via the bypass valve 5. It is arranged in a forward gradient. With this, a gravity type heat pipe can be constructed.

When the refrigerant circuit 8 is used as a heat pump, the refrigerant remains in the compressor, and depending on the temperature conditions, there is very little refrigerant in the condenser 2 and evaporator 4. When used as a pipe, there may be a shortage of refrigerant, so this is used to collect refrigerant into the condenser 2 or evaporator 4 by pumping down the heat pump.

Pump down involves opening the valve 18 and closing the valve 19 and operating the heat pump for a certain period of time to liquefy the refrigerant into the evaporator 4 or condenser 2, then stopping the compressor 1 and closing the valves 18 and 19. , thereby forming a heat pipe in which the refrigerant circulates between the condenser 2 and the evaporator 4 via the open bypass valve 5. The operation of the fan 7 and the transfer of heat using such a heat pipe during heating and cooling are as follows:
Since this is the same as the previous embodiment using a heat pump, the explanation will be omitted.

Thus, in this embodiment, valves 5, 18, 1
By opening and closing 9, it is possible to switch between an operation in which heat is actively recovered using a heat pump and an operation in which the compressor is stopped and a heat pipe is used at a low running cost. As a result, economical operation according to the ventilation load becomes possible.

Note that the valves 5, 18, and 19 are opened and closed using a control device that automatically controls the opening and closing of these valves depending on the ventilation load, or they are switched manually.

Also, if the refrigerant piping 8 is arranged so that all the refrigerant remains in the evaporator 4 when the compressor 1 stops, the valve 1
8 and 19 are unnecessary and there is no need to pump down.

A third embodiment of the invention will be described based on FIG. 4. That is, as shown in FIG. 4, this ventilation system has a compressor 1 installed in an intake passage 21. Thereby, the heat released by the compressor 1 can be recovered into the indoor intake air during the heating period, and the heat radiation of the compressor 1 can also be used effectively.

In addition, during the cooling period, the air intake port 21 is used for exhausting indoor air due to the reverse operation of the fan 7, so there is no need to worry about heating the indoor room with the heat of the compressor.

In the above embodiment, the rotation of the fan 7 is reversed to switch the ventilation between the heating period and the cooling period, but the flow direction of the refrigerant in the refrigerant circuit of the heat pump may be changed.

〔Effect of the invention〕

According to the ventilation system of the present invention, the two conduction ports are connected via the dehumidification circuit duct, the opening/closing damper is installed in the dehumidification circuit duct, and the two
Since a lid for opening and closing is provided on the outdoor side opening of the two ventilation ports, in addition to heat recovery ventilation, dehumidification and circulation functions can be performed with a single device.
The device itself is also inexpensive and compact, which has the effect of saving space.

According to another ventilation device of the present invention, the refrigerant piping includes a valve that bypasses the expansion valve, a valve that opens and closes the inflow of refrigerant to the compressor, and a valve that opens and closes the outflow of the refrigerant from the compressor. With this, the heat pump can be stopped and part of the heat pump's refrigerant circuit can be used as a heat pipe, making it possible to perform economical heat recovery ventilation with low running costs depending on the ventilation load. effective.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the heat recovery ventilation state in the first embodiment of the present invention, FIG. 2 is an explanatory diagram of the dehumidification state, and FIG. 3 is an explanatory diagram of the second embodiment of the invention.
FIG. 4 is an explanatory diagram of a third embodiment of the present invention. 1... Compressor, 2... Condenser, 3... Capillary reach tube (expansion valve), 4... Evaporator, 5...
Bypass valve, 7...Fan (blower), 8...Refrigerant piping, 11, 13...Outdoor side opening, 15, 1
5'... Damper (lid body), 17... Duct for dehumidification circuit, 18, 19... Valve, 21... Intake conduction port,
22...Exhaust ventilation port, 23...Indoor, 24...
Outdoors.

Claims (1)

[Scope of Claims] 1. A condenser is installed in one of the two ventilation ports for intake and exhaust, and an evaporator is installed in the other, and a blower is provided in at least one of these ventilation ports, A ventilation system in which the condenser and evaporator are connected by refrigerant piping of a heat pump including a compressor and an expansion valve, wherein the two communication ports are connected via a dehumidification circuit duct, and the two conduction ports are connected to the dehumidification circuit duct. 1. A ventilation system characterized in that an opening/closing damper is attached, and a lid for opening/closing is further provided at the outdoor side openings of the two communication ports. 2. The ventilation device according to claim 1, wherein the lid also serves as a damper for the dehumidifying circuit duct and closes both end openings of the duct while the outdoor opening is open. 3 A condenser is installed in one of the two ventilation ports for intake and exhaust, and an evaporator is installed in the other, and a blower is installed in at least one of these ventilation ports, and the condenser and evaporator are installed in at least one of the ventilation ports. a ventilator connected by a refrigerant pipe of a heat pump including a compressor and an expansion valve, the refrigerant pipe including a valve that bypasses the expansion valve, a valve that opens and closes the inflow of refrigerant to the compressor, A ventilation device characterized by being provided with a valve that opens and closes the outflow of refrigerant from the container.