JP3603844B2 - External heat recovery system - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a heat recovery external conditioning system.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, when performing air conditioning that requires ventilation for a room or the like, the supplied air is completely exhausted, and the exhaust heat (return air heat) is discarded outdoors.
[0003]
[Problems to be solved by the invention]
For this reason, running costs are high and waste is increased in the case of performing outside air processing. Therefore, an object of the present invention is to provide a heat recovery external control system that solves these problems.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a heat recovery external control system for supplying and exhausting air to an indoor zone that performs local exhaust, which recovers heat from return air in an indoor zone, exhausts the air outside, and A heat pump type external conditioner that exchanges heat with the outside air from outside using heat and supplies air to the indoor zone, and a duct for freely connecting and connecting the heat pump type external conditioner to the outdoor and indoor zones so as to freely supply and exhaust air. The group is provided with a damper mechanism capable of adjusting the air volume which is supplied at least to the return air and supplied to the heat pump type external conditioner by supplying an external air volume including at least a recovered heat equivalent to a local exhaust air volume while maintaining a predetermined air supply amount. is there. In addition, a damper mechanism that automatically controls at least the proportion of the amount of return air to the heat pump type external conditioner in proportion to the increase and decrease of the local exhaust amount is provided. Furthermore, of the duct group, the outside air duct that sends outside air from outside to the heat pump type outside air conditioner, the return air duct that sends return air from the indoor zone to the heat pump outside air conditioner, and the connection between the return air duct and the outside air duct The damper mechanism is constructed by providing a flow rate adjusting damper for each of the bypass ducts to be used.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
1 and 2 show an embodiment of a heat recovery outside air conditioning (outside air processing air conditioning) system of the present invention. This heat recovery external conditioning system supplies and exhausts air to / from the indoor zone A that performs local exhaust. The heat recovery from the return air (RA) in the indoor zone A is exhausted to the outside B, and the recovered heat is used. And a heat pump type external conditioner H that exchanges heat with the outside air (OA) from the outside A to supply the indoor zone A with heat. A duct group C that connects and connects the heat pump type external conditioner H, the outdoor B, and the indoor zone A so as to be able to freely supply and exhaust air is supplied with an external air amount including at least a local exhaust air amount while maintaining a predetermined air supply amount. A damper mechanism D capable of adjusting the amount of air supplied to the return air (RA) and flowing to the heat pump type external conditioner H is provided. Solid and dotted outline arrows indicate the direction of air flow.
[0006]
The duct group C includes an outside air duct 16 that sends outside air (OA) from the outdoor B to the heat pump type external conditioner H, a return air duct 17 that sends return air (RA) from the indoor zone A to the heat pump type external conditioner H, A bypass duct 18 that connects and connects the return air duct 17 and the outside air duct 16 in the middle thereof, an air supply duct 19 that sends air (SA) from the heat pump type external conditioner H to the indoor zone A, and a heat pump type external conditioner H And an exhaust duct 20 for sending exhaust (EA) from the outside to the outdoor B. In the duct group C, the outside air duct 16, the return air duct 17, and the bypass duct 18 are provided with manual or automatic air volume adjustment dampers 21, 22, and 23, respectively, to constitute a damper mechanism D. When the local exhaust volume is constant, the air volume adjustment of the air volume adjusting dampers 21, 22, and 23 is fixed, and when the local exhaust volume increases and decreases, at least the heat pump type external conditioner H is proportional to the increase and decrease of the local exhaust volume. A damper mechanism D that automatically controls using a sensor or the like so as to increase or decrease the ratio of the amount of returned air to the damper.
[0007]
The heat pump type external conditioner H includes, in a casing 1, an exhaust air passage 5 provided with a condenser 2, an outside air air passage 6 provided with an evaporator 3, and a refrigerant circulation circuit 7. The refrigerant circulation circuit 7 including the condenser 2, the evaporator 3, the compressor 4, and the like also includes a not-shown liquid receiver, an expansion valve, a switching valve for circulating the refrigerant, and the like. And heat radiation can be switched. The casing 1 is formed with an outside air intake 10, an air supply port 11, a return air intake 12, and an exhaust port 13. The outside air intake 10 and the air supply port 11 are connected to each other through an outside air ventilation path 6, and the casing 1 is returned. The air intake port 12 and the exhaust port 13 are connected to each other through the exhaust air passage 5. The return air inlet 12 is connected to and communicates with the indoor zone A via a return air duct 17 and an inlet, and the air supply port 11 is connected to and communicates with the indoor zone A via an air supply duct 19 and an outlet. The indoor zone A is provided with an exhaust port for local exhaust, a fan, a ventilation fan, and the like.
[0008]
In this heat recovery external conditioning system, the external air (OA) taken in from the external air inlet 10 is heat-exchanged in the evaporator 3, and the humidifier 9 is operated as necessary to supply a predetermined air volume from the air supply port 11, At the same time, the circulating refrigerant in the condenser 2 is heat-exchanged with the return air (RA) taken in from the return air inlet 12 to absorb heat or radiate heat (heat recovery) and exhaust the air from the exhaust port 13 to the outside. In the case of performing local exhaust, the outside air amount including at least the recovered heat equivalent to the local exhaust amount (the amount of heat of the return air which becomes insufficient due to the local exhaust) is maintained by the damper mechanism D while maintaining the predetermined air supply amount. The return air to the conditioner H is replenished so that the amount of heat (air flow) that can be exchanged in the condenser 2 can be obtained at least by the return air amount at the time of full exhaust, thereby preventing a decrease in heat exchange capacity. In addition, when the local exhaust volume increases or decreases due to turning on / off of a ventilation fan or the like, the ratio of the return air volume to the heat pump type external conditioner H is automatically increased or decreased by using the above-described damper mechanism D of the proportional control. Thus, the amount of return air heat in the indoor zone A that is not recovered and lost is minimized. For example, the amount of return air to the heat pump type external conditioner H is increased in proportion to the decrease in the local exhaust amount, and the amount of return air to the heat pump type external conditioner H is reduced in proportion to the increase in the local exhaust amount. In addition, the amount of auxiliary external air to the condenser 2 is reduced in proportion to the decrease in the local exhaust amount, and the amount of auxiliary external air to the condenser 2 is increased in proportion to the increase in the local exhaust amount. Can be achieved.
[0009]
The heat pump type external conditioner H is not limited to the structure shown in the figure, but can be freely changed in various ways such as a ceiling installation structure.
[0010]
【The invention's effect】
According to the first aspect of the present invention, since the outside air conditioner can be operated using the exhaust heat (return air heat), the heat exchange capacity is high, the size can be reduced, and energy can be saved. While keeping the heat exchange capacity of the heat pump type external conditioner high, the ratio of the local exhaust gas amount to the supply air amount can be made wider, and the use range of the heat recovery external control system can be expanded. Since the damper mechanism is provided on the duct side, the heat pump type external conditioner can be simplified and downsized, the manufacturing can be facilitated, and the installation area can be reduced.
According to the second aspect of the present invention, when the local exhaust air volume is reduced, the return air having a large amount of recovered heat per air flow sent to the heat pump external air conditioner can be increased. It saves energy.
According to the third aspect of the present invention, the number of dampers provided in the duct is small, and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a system diagram showing one embodiment of the present invention.
FIG. 2 is a sectional view of a heat pump type external conditioner.
[Explanation of symbols]
A Indoor zone B Outdoor C Duct group D Damper mechanism H Heat pump type external conditioner 16 External air duct 17 Return air duct 18 Bypass duct

Claims (3)

A heat recovery air conditioning system for supplying and exhausting air to an indoor zone that performs local exhaust, wherein the heat is recovered from the return air of the indoor zone, exhausted to the outside, and the recovered heat is used to remove the outside air from the outdoor. A heat pump type external air conditioner for exchanging heat and supplying air to the indoor zone, and a predetermined air supply amount to a group of ducts for connecting and connecting the heat pump type external air conditioner to the outdoor and indoor zones so as to be able to supply and exhaust air freely. Characterized in that a damper mechanism capable of adjusting the amount of air supplied to the heat pump type external conditioner by supplying at least the outside air including the recovered heat equivalent to the local exhaust amount to the return air while maintaining Tone system. 2. The heat recovery external conditioning system according to claim 1, further comprising a damper mechanism for automatically controlling the proportion of the amount of return air to the heat pump type external conditioner to increase or decrease at least in proportion to the increase or decrease of the local exhaust amount. Among the group of ducts, an outside air duct that sends outside air from outside to a heat pump type outside air conditioner, a return air duct that sends return air from an indoor zone to the heat pump outside air conditioner, and communication between the return air duct and the outside air duct The heat recovery external control system according to claim 1 or 2, wherein a damper mechanism is provided by providing an air volume adjusting damper to each of the bypass ducts to be connected.

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