JP2009250593A - Heat pump system for residence in cold area - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively prevent decline in efficiency of a heat pump in winter by a simple system when using the heat pump in a residence in a cold area. <P>SOLUTION: This heat pump system 1 for performing heat exchange with water or antifreeze solution used for heating a residence in a condenser 1a is provided with an introduction means 1f for exhaust air for warming a refrigerant by the exhaust air of ventilation of the residence in an evaporator 1b. When outside air temperature is below predetermined temperature, introduction of the exhaust air of ventilation of the residence is performed by the introduction means 1f. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an improvement of a residential heat pump system.

  Currently, heat pumps are used for heating and hot water supply in houses. Because heat pumps produce hot water using heat absorption and release due to changes in the state of the refrigerant, they do not require fossil fuels, and are generally more efficient than fossil fuels to produce hot water and have a lower environmental impact. The spread is desired.

  Here, in general, such a heat pump is unitized and installed outside a house, and the refrigerant in the evaporator is heated by outside air. For this reason, in cold regions where the outside air temperature is -10 degrees Celsius or lower in winter such as Hokkaido, the efficiency of the heat pump is significantly reduced in winter. For this reason, the penetration rate of residential heat pumps is lower in cold regions than in other regions.

In addition, there exists a thing shown by patent document 1 as a prevention technique of the fall of the efficiency of the heat pump in a cold region.
JP 2006-266523 A

  The main problem to be solved by the present invention is that, when a heat pump is used in a house in a cold region, a decrease in efficiency in winter is effectively prevented with a simple system.

In order to achieve the above object, according to the present invention, from the first aspect, the heat pump system performs heat exchange with water or antifreeze liquid used for heating a house in a condenser. ,
The evaporator is provided with a means for introducing the exhaust to warm the refrigerant by the exhaust of the ventilation of the house.

Moreover, in order to achieve the said subject, in this invention, from a 2nd viewpoint, a heat pump system is
A heat pump system for exchanging heat with water or antifreeze for use in heating a house in a condenser,
A first evaporator, a second evaporator, and a switching valve means for selectively connecting one of the condenser and the first and second evaporators,
In the first evaporator, the refrigerant is warmed by the outside air, and in the second evaporator, the refrigerant is warmed by the exhaust by the exhaust ventilation means for housing ventilation.
When the outside air temperature is equal to or lower than a predetermined temperature, the second evaporator and the condenser are connected by the switching valve means, and the ventilation air for the house is introduced by the introducing means.

  In the heat pump system according to the present invention, the heating of the refrigerant in the evaporator can be performed by using the exhaust of the ventilation of the house. In the winter, the heating is performed by exhausting the indoor air of the house warmer than the outside air. By making the temperature warm, it is possible to effectively prevent a decrease in the efficiency of the heat pump in the winter season even though it is a simple system.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to FIGS. 1 and 2. Here, FIG. 1 shows an operation mode of the heat pump system 1 at a time other than winter, and FIG. 2 shows an operation mode of the heat pump system 1 in winter.

  The heat pump system 1 according to this embodiment is used to warm water or antifreeze and use it for heating a house or the like. The heat pump system 1 is typically used to supply hot water or antifreeze used in the heater 2b, hot water used around the water such as a bath 2c or a kitchen to these devices or facilities.

  That is, the heat pump system 1 performs heat exchange with water or antifreeze liquid used for heating a house in the condenser 1a. In the figure, reference numeral 2 denotes a hot water supply system, and the heat exchange is typically performed in a heat pump system in which a pipe constituting the condenser 1a and a water supply pipe to the hot water supply unit 2a are adjacent to each other through both pipes. This is done by warming water with one refrigerant.

  Reference numeral 1 in the figure denotes a heat pump system. The heat pump system 1 is unitized and installed outside a house or the like. The heat pump system 1 selectively connects one of the first evaporator 1b ′, the second evaporator 1b ″, the condenser 1a, and the first and second evaporators 1b ′ and 1b ″. And switching valve means 1e. In the illustrated example, the compressor 1c, the condenser 1a, and the expansion valve 1d are permanently connected, and the compressor 1c is connected between the secondary side (the refrigerant outflow side) of the expansion valve 1d and the evaporator 1b. A switching valve means 1e such as a three-way valve is arranged between the primary side (the refrigerant inflow side) and the evaporator 1b to achieve the selective connection.

  Then, in the first evaporator 1b ′, the refrigerant is warmed by the outside air, and in the second evaporator 1b ″, the refrigerant is warmed by the exhaust by the exhaust ventilation introducing means 1f of the house. That is, the condenser 1a. When the first evaporator 1b 'is connected, the refrigerant circulating between the two is warmed by the outside air, and when the condenser 1a and the second evaporator 1b "are connected, the refrigerant is circulated between them. The refrigerant is heated by exhausting the ventilation of the house. The introduction means 1f typically includes a flow path for guiding the air sent from the secondary side (air outflow side) of the third type ventilation fan to the second evaporator 1b ″. Specifically, by installing the second evaporator 1b ″ in the air flow path, the refrigerant can be warmed in the second evaporator 1b ″ by the air.

  In this embodiment, when the outside air temperature is equal to or lower than the predetermined temperature, the switching valve means 1e connects the second evaporator 1b "and the condenser 1a, and the introduction means 1f. In particular, when the outside air temperature becomes a temperature that lowers the efficiency of the heat pump below a predetermined value, the second evaporator 1b "and the condenser are introduced. The operation of the heat pump system 1 is controlled so as to be connected to 1a. More specifically, in the heat pump system 1 currently used, when the outside air temperature becomes −10 ° C. or lower, the refrigerant cannot sufficiently absorb heat in the evaporator 1b installed outdoors, and the efficiency drops significantly. The operation of the heat pump system 1 is controlled so that the second evaporator 1b ″ and the condenser 1a are connected when the temperature becomes −10 degrees Celsius or less.

  According to the heat pump system 1 configured as described above, this can be used with a simple system so as not to decrease the efficiency of the heat pump throughout the year. Therefore, such a system contributes to lowering the running cost of the heat pump, and contributes to the popularization of the heat pump in a cold region.

  Separately from the example shown in the figure, the evaporator 1b of the heat pump system 1 is used as a single unit, and when the outside air temperature becomes a predetermined temperature or lower, the refrigerant is heated in the evaporator 1b by the exhaust air of the house. You can keep it. For example, a first path for exposing the evaporator 1b to the outside air and a second path for exposing the evaporator 1b to the exhaust of the ventilation are provided, and the outside air is introduced through the first path until the outside air temperature becomes a predetermined temperature or lower. Exhaust is not introduced, and when the outside air temperature falls below a predetermined temperature, exhaust is introduced by the second path so that outside air is not introduced.

Configuration diagram of heat pump system 1 (spring, summer, autumn) Configuration of heat pump system 1 (winter season)

Explanation of symbols

1 Heat pump system 1
1b Evaporator 1b
1f Introducing means 1f

Claims (3)

A heat pump system for exchanging heat with water or antifreeze for use in heating a house in a condenser,
A heat pump system for a residential house in a cold region, characterized by comprising means for introducing the exhaust air that heats the refrigerant in the evaporator by exhaust air exhausted from the house.   2. The residential heat pump system in a cold district according to claim 1, wherein when the outside air temperature is equal to or lower than a predetermined temperature, exhaust air for ventilation of the house is introduced by the introducing means. A heat pump system for exchanging heat with water or antifreeze for use in heating a house in a condenser,
A first evaporator, a second evaporator, and a switching valve means for selectively connecting one of the condenser and the first and second evaporators,
In the first evaporator, the refrigerant is warmed by the outside air, and in the second evaporator, the refrigerant is warmed by the exhaust by the exhaust ventilation means for housing ventilation.
When the outside air temperature is equal to or lower than a predetermined temperature, the second evaporator and the condenser are connected by the switching valve means, and the exhaust air for housing ventilation is introduced by the introducing means. A heat pump system for residential buildings in cold regions.

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