JP2005283036A - Heat pump type air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce costs of installation and operation by corresponding to air conditioning of various types of special environments. <P>SOLUTION: The heat pump type air conditioner is provided with first and second compression type heat pumps A and B, and first and second humidifiers 5a and 5b. A first evaporator 2a for refrigerant-air heat exchange of the first heat pump A, the first humidifier 5a, a second evaporator 2b for refrigerant-air heat exchange of the second heat pump B, and the second humidifier 5b are arranged in this order in an air blowing direction. One condenser 3 is shared by the first heat pump A and the second heat pump B. Each evaporator 2a and 2b of the first and second heat pumps A and B is composed so as to freely change between refrigerant evaporation and refrigerant condensation. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heat pump type air conditioner.

  In air conditioning in special environments such as electronic factories, agricultural factories, breeding rooms, and grain warehouses, it is necessary to adjust the temperature and humidity by heating and cooling the air-conditioning air in a predetermined order and appropriately humidifying it. Therefore, for example, there is a system in which a cold water coil (cooling coil), a hot water coil (heating coil), a humidifier, and the like are provided, and the heat source water circuit is a four-pipe type, and the cold water and the hot water coil are separately supplied with cold water and hot water. However, the four-pipe heat source water circuit has a problem that the piping distance is long and the equipment cost is high, and it is necessary to make cold water and hot water at the same time.

  In addition, when a water-cooled heat pump is used instead of the cold-water coil and the hot-water coil, for example, the plate-type water heat exchanger of the water-cooled heat pump has a problem that it requires periodic disassembly and cleaning for maintenance of the capacity and takes time and maintenance. In addition, since the heat pump has an upper limit on the air heating temperature (refrigerant condensation temperature), the vaporization method is used under conditions where the air temperature / humidity is low and a large amount of humidification is required with respect to the desired temperature and humidity (especially high temperature and high humidity). When humidified, the desired supply air temperature may not be reached due to latent heat of vaporization. Therefore, there is a problem that the temperature / humidity range in which air conditioning can be performed becomes narrow, and the compression efficiency and consequently the coefficient of performance (COP) decrease.

JP-A-63-233244 Japanese Patent Laid-Open No. 11-14296

  The problem to be solved is that the equipment cost and operating cost are high, the maintenance of the water heat exchanger is troublesome, and furthermore, it is compatible with a wide range of air conditioning in various special environments, and is a compact and good COP heat pump type Provide air conditioners.

  In order to solve the above-described problem, the present invention includes first and second compression heat pumps, and first and second humidifiers, and the first evaporation for refrigerant-air heat exchange of the first heat pump. A first evaporator, a second evaporator for refrigerant-air heat exchange of the second heat pump, and the second humidifier are sequentially arranged in the blowing direction, and one condenser is connected to the first heat pump. The most main feature is that the evaporators of the first and second heat pumps are configured to be able to switch between refrigerant evaporation and refrigerant condensation in common with the second heat pump.

According to the first aspect of the present invention, the air conditioning operation in a special environment that requires heating and cooling of the air-conditioning air can be performed only by the heat pump without using the cold / hot water coil, and the equipment cost and the operation cost can be reduced. Since the condensers of the first and second heat pumps are shared, the number of parts can be reduced and the size can be reduced. Since heating and humidification can be performed in two stages, the temperature / humidity range (especially the high temperature and high humidity side) that can be air-conditioned is widened, and the compression efficiency and thus the COP are improved.
According to the second aspect of the present invention, a cold district building, an office building, 24-hour operation using one of the heat pumps as a backup, an outside air treatment for an animal breeding room, a hospital treatment room, etc., an agricultural factory, a pharmaceutical factory, a machine precision Constant temperature and humidity air conditioning operation at factories, electronics factories, arts and museums, cold aisle elimination at food departments, dry kitchens at hotels and restaurants, dehumidification drying air conditioning operations such as food drying and chemical drying, and grain warehouses Low-temperature humidification air-conditioning operation can be performed for storage of electricity and prevention of static electricity at electronic factories.
According to invention of Claim 3, if the 2nd humidifier is made into a steam blowing system, stepless control is possible without temperature fall, temperature / humidity control can be performed accurately, and the load of an evaporator can be reduced.
According to the invention of claim 4, since the condenser is a so-called water cooling type, the heat exchange capacity and COP are high and the performance is stable. Therefore, even when the fresh outdoor air is supplied after adjusting the temperature and humidity, it is not affected by the weather / climate. It can be air-conditioned with high accuracy and can be used in a wide range of areas from cold to hot. When one of the refrigerants evaporates and the other condenses in the common condenser, heat exchange between the refrigerants can also be performed, increasing COP and saving energy.
According to the invention of claim 5, the plate type refrigerant-heat source water heat exchanger can be cleaned by washing without disassembling, and maintenance is facilitated.
According to the sixth aspect of the present invention, the water passage mechanism can be configured with a simple structure with few parts, and can be easily manufactured, cost can be reduced, and space can be saved. The chemical cleaning can be performed by blocking the inflow of the heat source water to the cleaning flow path, and the cleaning effect is increased.
According to the seventh aspect of the present invention, the strainer can be used for removing foreign matter from the heat source flow path and the cleaning flow path, and it is not necessary to provide a strainer separately, thereby reducing the cost.
According to the invention of claim 8, when the heat exchange air of the condenser is return air, the COP can be improved by heat recovery. Since the condenser shares the fin group, the heat transfer area is increased, and the heat exchanging capacity is increased even when only one of the first and second heat pumps is operated. When one of the refrigerants evaporates and the other condenses in the common condenser, heat exchange between the refrigerants can also be performed, increasing COP and saving energy.
According to the ninth aspect of the present invention, COP is improved by exchanging heat of the condenser at a high wind speed to save energy, and a small condenser can be used, so that the air conditioner can be made compact. Capacitor surface air speed control allows fine adjustment of air conditioner capacity, and can be used in a wide range of areas, from cold to hot, without increasing the size of the compressor.
In the invention of claim 10, since the pressure loss is reduced and the heat exchange efficiency is improved, a small blower can be used and noise can be reduced. The heat exchanger for refrigerant-air heat exchange can also be miniaturized and the air conditioner can be made compact.

  1-3 has shown one Example of the heat pump type | formula air conditioner of this invention, The solid line and the dotted white arrow show the ventilation direction. This air conditioner is provided with a supply air blow passage 9, first and second compression heat pumps A and B, first and second humidifiers 5a and 5b, and air for air conditioning. And a blower 6 for supplying air to the air-conditioned space. In the air supply air passage 9, the first evaporator 2a for refrigerant-air heat exchange and the first humidifier 5a of the first heat pump A and the second evaporator 2b for refrigerant-air heat exchange of the second heat pump B and the second humidifier are provided. The condenser 5b is arranged in order in the blowing direction, and one condenser 3 is shared by the first heat pump A and the second heat pump B, and the evaporators 2a and 2b of the first and second heat pumps A and B are used. Is configured to be able to switch between refrigerant evaporation and refrigerant condensation. For example, a cycle in which refrigerant is evaporated in both or one of the first evaporator 2a and the second evaporator 2b, a cycle in which refrigerant is evaporated in the first evaporator 2a and refrigerant is condensed in the second evaporator 2b, and the first evaporator 2a And a cycle in which the refrigerant is condensed in both or one of the second evaporator 2b, or a cycle in which the refrigerant is condensed in the first evaporator 2a and the refrigerant is condensed in the second evaporator 2b and the first evaporator 2a. And a cycle in which the refrigerant is condensed in both or one of the first evaporator 2b or at least one of them, or a cycle in which the refrigerant is evaporated in both or one of the first evaporator 2a and the second evaporator 2b and the first evaporator It is configured to be switchable at least between the cycle in which the refrigerant is condensed in 2a and the refrigerant is evaporated in the second evaporator 2b.

  The condenser 3 is a plate-type refrigerant-heat source water heat exchanger, and the refrigerant flow path of the first heat pump A, the refrigerant flow path of the second heat pump B, and the heat source water flow path in the condenser 3 are arranged so that they can exchange heat with each other. Set up. The plate-type condenser 3 is configured such that, for example, a number of heat transfer plates (plates) are stacked and heat source water and two refrigerants alternately flow between the heat transfer plates and the heat transfer plates to exchange heat with each other. The condenser 3 is connected to a heat source water circuit 12 through which heat source water whose temperature has been adjusted by the heat source device 11 flows. (See FIG. 3) The first heat pump A includes a common condenser 3 for exchanging heat of the circulating refrigerant with heat source water, a first evaporator 2a for exchanging heat of air-conditioning air with the circulating refrigerant, and a first compression 4a, an expansion valve, a forward / reverse switching valve (four-way valve) in the refrigerant circulation direction, a liquid receiver (not shown), and the like, which are connected by piping to form a refrigerant circulation circuit and the switching valve Thus, the heat absorption and heat release (evaporation function and condensation function) in the condenser 3 and the first evaporator 2a can be switched. The second heat pump B includes a common condenser 3, a second evaporator 2b for exchanging heat of the air-conditioning air with a circulating refrigerant, a second compressor 4b, an expansion valve, and the reverse of the refrigerant circulation direction. A switching valve (four-way valve), a liquid receiver (not shown), and the like are provided, and these are connected by piping to form a refrigerant circulation circuit, and heat absorption and heat dissipation in the condenser 3 and the second evaporator 2b are performed by the switching valve. (Evaporation function and condensation function) are configured to be switchable. As the first and second humidifiers 5a and 5b, various types such as a vaporization method and a steam blowing method can be used.

  The air conditioning air inlet and the air conditioning air outlet are provided in the casing 1, and the air conditioning air inlet is used for returning air, for taking outside air, or for taking mixed air of returning air and outside air through a duct or the like. The air-conditioned air outlet is connected to an air-conditioned space such as a room through a duct or the like for air supply. Heat source water is passed through the condensers 3 of the first and second heat pumps A and B, and blown by the blower 6, whereby the first evaporator 2a and the second evaporator 2b of the first and second heat pumps A and B. The air-conditioning air is heat-exchanged (cooled / heated) in both or one of the air and supplied to the air-conditioned space, and air-conditioning operation is performed according to various environments. The use limit water temperature range of the heat source water when performing cooling and heating with the first and second heat pumps A and B is, for example, 10 ° C to 45 ° C. Using water, the first and second heat pumps A and B can be switched between cooling and heating, and the heat source water circuit 12 is a two-pipe type. The fin tubes of the first evaporator 2a and the second evaporator 2b are preferably elliptical tubes with little pressure loss, but may be circular tubes.

  In the casing 1, a water passage mechanism D that allows the heat source water from the heat source water circuit 12 and the cleaning liquid from the cleaning device 13 to selectively flow to the condenser 3 is provided. FIG. 3B shows a state where a cleaning device 13 for cleaning the condenser 3 is connected, and FIG. 3A shows a state where the cleaning device 13 is removed. The water flow mechanism D is provided separately for the heat source water inlet passage 16a and the heat source water outlet passage 16b for connecting the heat source water circuit 12 and the condenser 3, and the heat source water inlet passage 16a and the heat source water outlet passage 16b. The connection ports 17 and 17 with plugs are connectable and separable to the cleaning liquid inlet path 20a and the cleaning liquid outlet path 20b, and the cleaning device 13 and the condenser 3 are connected by the cleaning liquid inlet path 20a and the cleaning liquid outlet path 20b. On-off valves 18 and 18 for shutting off the inflow of heat source water into the cleaning flow path E, and a heat source flow formed by connecting the heat source water circuit 12 and the condenser 3 with a heat source water inlet passage 16a and a heat source water outlet passage 16b. A strainer 19 is provided at a shared portion of the path F and the cleaning flow path E. During the air-conditioning operation, the plugs of the connection ports 17 and 17 are closed in the state of FIG. 3A, the on-off valves 18 and 18 are opened and the heat source water is allowed to flow, and the strainer 19 is appropriately cleaned. When cleaning the condenser 3, the inside of the casing 1 is exposed, the plugs of the connection ports 17 and 17 are removed and the cleaning liquid inlet path 20a and the cleaning liquid outlet path 20b of the cleaning device 13 are connected as shown in FIG. The valves 18 and 18 are closed and the cleaning liquid is supplied to the condenser 3 for cleaning. After the cleaning, the strainer 19 is cleaned. The strainer 19 can be freely changed to a position other than the illustrated example. In addition, the water flow mechanism D is not provided inside the casing 1 but may be provided entirely outside or partially provided outside.

  The air conditioner of FIG. 2 controls the capacity of each of the first and second heat pumps A and B, the blower 6, and the first and second humidifiers 5a and 5b, and responds to the air temperature and humidity at the inlet of the first evaporator. A cycle in which the refrigerant is evaporated in both or one of the first evaporator 2a and the second evaporator 2b, a cycle in which the refrigerant is evaporated in the first evaporator 2a and the refrigerant is condensed in the second evaporator 2b, and the first evaporator 2a Control means (not shown) that can be switched at least to the cycle in which the refrigerant is condensed in both or one of the second evaporators 2b is provided, and the outside air treatment of the air-conditioned space can be performed. For example, when the first evaporator inlet air temperature / humidity is higher than the desired air temperature and humidity, cooling and dehumidification in both or one of the first evaporator 2a and the second evaporator 2b, or the first evaporator After cooling and dehumidifying at 2a, the temperature is adjusted by heating with the second evaporator 2b and controlled to a predetermined temperature and humidity. If the temperature of the first evaporator inlet air is low and the humidity is high with respect to the desired air temperature, the temperature is controlled by dehumidifying with the first evaporator 2a and then heating with the second evaporator 2b. Control to a predetermined temperature and humidity. When the first evaporator inlet air temperature / humidity is lower than the desired temperature and humidity, the first evaporator 2a is heated and then humidified by the first humidifier 5a. Further, the second evaporator 2b Then, the air is humidified by the second humidifier 5b and controlled to a predetermined temperature and humidity. In this case, the first humidifier 5a and the second humidifier 5a are heated by either or both of the first evaporator 2a and the second evaporator 2b in accordance with the heating amount and the humidification amount necessary to obtain a desired temperature and humidity. It is also possible to control to a predetermined temperature and humidity by humidifying only with one of the humidifiers 5b. When the temperature of the first evaporator inlet air is high and the humidity is low with respect to the desired temperature and humidity, the first evaporator 2a and / or the second evaporator 2b are dried and cooled, and the first humidifier 5a Humidification is performed by both or one of the second humidifiers 5b and controlled to a predetermined temperature and humidity.

  In the embodiment of FIG. 2, the control means controls the capacities of the first and second heat pumps A and B, the blower 6, and the first and second humidifiers 5a and 5b, and the inlet of the first evaporator. A cycle in which refrigerant is evaporated in the first evaporator 2a and refrigerant is condensed in the second evaporator 2b and a cycle in which refrigerant is condensed in one or both of the first evaporator 2a and the second evaporator 2b in accordance with the air temperature humidity. If it is configured to be switchable at least, the air-conditioned space can be air-conditioned at constant temperature and humidity. For example, when the second humidifier 5b is a steam blowing system, the first evaporator inlet air temperature / humidity is higher than the desired air supply humidity and the first evaporation relative to the desired air supply humidity. When the temperature of the inlet air is low and the humidity is high, the temperature is reduced by cooling with the first evaporator 2a and then heated by the second evaporator 2b, or the temperature is reduced by the first evaporator 2a. Then, the temperature is adjusted by heating with the second evaporator 2b, and then humidified without lowering the temperature with steam, and controlled to a predetermined temperature and humidity. When the first evaporator inlet air temperature / humidity is lower than the desired temperature and humidity, the second humidifier 5b is heated and adjusted in both or one of the first evaporator 2a and the second evaporator 2b, and then the second humidifier 5b. The steam is humidified without reducing the temperature with steam and controlled to a predetermined temperature and humidity. In this case, after heating in the first evaporator 2a, humidifying in the first humidifier 5a, and further heating in the second evaporator 2b, and then the temperature is not lowered by steam in the second humidifier 5b. It is also possible to control to a predetermined temperature and humidity. When the temperature of the first evaporator inlet air is high and the humidity is low with respect to the desired supply air temperature and humidity, the temperature is adjusted by drying and cooling in both or one of the first evaporator 2a and the second evaporator 2b, and then by steam. Humidification is performed without lowering the temperature, and control is performed to a predetermined temperature and humidity.

  In this case, the air-conditioned space can be dehumidified and dried without stopping the first and second humidifiers 5a and 5b. For example, when the temperature of the first evaporator inlet air temperature is high with respect to the desired air temperature and humidity, and when the temperature of the first evaporator inlet air is low and the humidity is high with respect to the desired air temperature and humidity, the first evaporator 2a. When the first evaporator inlet air temperature and humidity is lower than the desired temperature and humidity, both the first evaporator 2a and the second evaporator 2b Or it heats by one side and it controls to predetermined supply air temperature humidity.

  In the embodiment of FIG. 2, the control means controls the capacities of the first and second heat pumps A and B, the blower 6, and the first and second humidifiers 5a and 5b, and the first evaporator. 2a and / or the second evaporator 2b, a cycle in which the refrigerant is evaporated, and a cycle in which the refrigerant is condensed in the first evaporator 2a and the refrigerant is evaporated in the second evaporator 2b are at least switchable. The air-conditioned space can be humidified at a low temperature. For example, when the first evaporator inlet air temperature / humidity is higher than the desired temperature and humidity, the first evaporator 2a and / or the second evaporator 2b is cooled and dehumidified to obtain the desired temperature and humidity. On the other hand, when the temperature and humidity at the inlet of the first evaporator is low, the air is heated by the first evaporator 2a and then humidified and then dried and cooled to control to a predetermined temperature and humidity. When the temperature of the first evaporator inlet air is high and the humidity is low with respect to the desired air temperature and humidity, the air is humidified and then dried and cooled only by the second evaporator 2b, and controlled to a predetermined air temperature and humidity.

  4 and 5 show another embodiment of the heat pump type air conditioner of the present invention, and the solid and dotted white arrows indicate the blowing direction. This air conditioner is provided with a supply air blow passage 9, first and second compression heat pumps A and B, first and second humidifiers 5a and 5b, and air for air conditioning. A blower 6 that supplies air to the air-conditioned space, a blower path 8, and a condenser blower 7 that blows heat exchange air such as outside air, return air, or mixed air thereof to the condenser 3 are provided. In the air supply air passage 9, the first evaporator 2a for refrigerant-air heat exchange and the first humidifier 5a of the first heat pump A and the second evaporator 2b for refrigerant-air heat exchange of the second heat pump B and the second humidifier are provided. The condenser 5b is arranged in order in the blowing direction, and one condenser 3 is shared by the first heat pump A and the second heat pump B, and one condenser 3 is used by the first heat pump A and the second heat pump B. The evaporators 2a and 2b of the first and second heat pumps A and B are configured to be capable of switching between refrigerant evaporation and refrigerant condensation. For example, a cycle in which refrigerant is evaporated in both or one of the first evaporator 2a and the second evaporator 2b, a cycle in which refrigerant is evaporated in the first evaporator 2a and refrigerant is condensed in the second evaporator 2b, and the first evaporator 2a And a cycle in which the refrigerant is condensed in both or one of the second evaporator 2b, or a cycle in which the refrigerant is condensed in the first evaporator 2a and the refrigerant is condensed in the second evaporator 2b and the first evaporator 2a. And a cycle in which the refrigerant is condensed in both or one of the first evaporator 2b or at least one of them, or a cycle in which the refrigerant is evaporated in both or one of the first evaporator 2a and the second evaporator 2b and the first evaporator It is configured to be switchable at least between the cycle in which the refrigerant is condensed in 2a and the refrigerant is evaporated in the second evaporator 2b. A condenser 3 and a blower 7 capable of increasing and decreasing the condenser surface wind speed (condenser passing air volume) are provided in the air passage 8.

  The condenser 3 is a refrigerant-air heat exchanger, and the refrigerant flow passage of the first heat pump A and the refrigerant flow passage of the second heat pump B in the condenser 3 are arranged so as to exchange heat with each other. In which the refrigerants of the first heat pump A and the refrigerant of the second heat pump B are evaporated and the other is condensed so that the two different refrigerants circulate in an opposing manner. Plan Furthermore, the condenser 3 is configured so that the flowing refrigerant is different for each row of fin tubes, for each stage of fin tubes, or for each fin tube, thereby eliminating uneven heat exchange with air and stabilizing the performance. The first heat pump A includes a common condenser 3 that exchanges heat of circulating refrigerant with heat exchange air, a first evaporator 2a that exchanges heat of air conditioning air with circulating refrigerant, and a first compressor 4a. An expansion valve, a forward / reverse switching valve (four-way valve) in the refrigerant circulation direction, a liquid receiver (not shown), etc., which are connected to each other to form a refrigerant circulation circuit and a condenser by the switching valve 3 and the first evaporator 2a can be switched between heat absorption and heat release (evaporation function and condensation function). The second heat pump B includes a common condenser 3, a second evaporator 2b for exchanging heat of the air-conditioning air with a circulating refrigerant, a second compressor 4b, an expansion valve, and the reverse of the refrigerant circulation direction. A switching valve (four-way valve), a liquid receiver (not shown), and the like are provided, and these are connected by piping to form a refrigerant circulation circuit, and heat absorption and heat dissipation in the condenser 3 and the second evaporator 2b are performed by the switching valve. (Evaporation function and condensation function) are configured to be switchable. As the first and second humidifiers 5a and 5b, various types such as a vaporization method and a steam blowing method can be used.

  The air-conditioning air inlet and air-conditioning air outlet of the air supply air passage 9 are provided in the casing 1, and the air-conditioning air inlet is used for intake of return air, intake of outside air or mixed air intake of return air and outside air, etc. The air-conditioning air outlet is communicated with the air-conditioned space such as the room via the duct and the air-conditioned air outlet is communicated with the air-conditioned space such as the room via the duct. An air inlet for heat exchange and an air outlet for heat exchange in the air passage 8 are provided in the casing 1, and the air inlet for heat exchange is a duct for intake of return air, intake of outside air, or intake of mixed air of return air and outside air. The air outlet for heat exchange is communicated with an air-conditioned space such as a room or the outside via a duct, and the air outlet for heat exchange is communicated with the outside via a duct or the like for exhaust. The first and second heat pumps A and B are blown to the condenser 3 and blown by the blower 6 to the first and second evaporators 2a and 2b of the first and second heat pumps A and B. Air-conditioning air is heat-exchanged (cooled and heated) to supply air to the air-conditioned space, and air-conditioning operation is performed according to various environments. The fin tubes of the first evaporator 2a, the second evaporator 2b and the condenser 3 are preferably elliptical tubes with little pressure loss, but may be circular tubes.

  The air conditioner of FIG. 5 controls the capacities of the first and second heat pumps A and B, the blowers 6 and 7, the first and second humidifiers 5a and 5b, and the air temperature and humidity at the inlet of the first evaporator. In accordance with the first evaporator 2a and / or the second evaporator 2b, a cycle in which the refrigerant is evaporated, a cycle in which the refrigerant is evaporated in the first evaporator 2a and a refrigerant is condensed in the second evaporator 2b, and the first evaporator Control means (not shown) that can be switched at least to the cycle in which the refrigerant is condensed in both or one of the second evaporator 2b and the second evaporator 2b are provided, and the outside air treatment of the air-conditioned space can be performed. For example, when the first evaporator inlet air temperature / humidity is higher than the desired air temperature and humidity, cooling and dehumidification in both or one of the first evaporator 2a and the second evaporator 2b, or the first evaporator After cooling and dehumidifying at 2a, the temperature is adjusted by heating with the second evaporator 2b and controlled to a predetermined temperature and humidity. If the temperature of the first evaporator inlet air is low and the humidity is high with respect to the desired air temperature, the temperature is controlled by dehumidifying with the first evaporator 2a and then heating with the second evaporator 2b. Control to a predetermined temperature and humidity. When the first evaporator inlet air temperature / humidity is lower than the desired temperature and humidity, the first evaporator 2a is heated and then humidified by the first humidifier 5a. Further, the second evaporator 2b Then, the air is humidified by the second humidifier 5b and controlled to a predetermined temperature and humidity. In this case, the first humidifier 5a and the second humidifier 5a are heated by either or both of the first evaporator 2a and the second evaporator 2b in accordance with the heating amount and the humidification amount necessary to obtain a desired temperature and humidity. It is also possible to control to a predetermined temperature and humidity by humidifying only with one of the humidifiers 5b. When the temperature of the first evaporator inlet air is high and the humidity is low with respect to the desired temperature and humidity, the first evaporator 2a and / or the second evaporator 2b are dried and cooled, and the first humidifier 5a Humidification is performed by both or one of the second humidifiers 5b and controlled to a predetermined temperature and humidity. The control means also performs condenser surface wind speed control by the blower 7 in accordance with the condenser load. For example, when the condenser load increases, the condenser surface wind speed increases, and when the condenser load decreases, the condenser surface wind speed decreases. By setting the surface wind speed of the condenser 3 to 4.0 to 6.0 m / s, the amount of heat can be secured above the compressor performance limit, and the COP is improved.

  In the embodiment of FIG. 5, the control means controls the capacities of the first and second heat pumps A and B, the blowers 6 and 7, and the first and second humidifiers 5a and 5b, and the first. According to the temperature and humidity of the inlet air of the evaporator, the refrigerant is evaporated in the first evaporator 2a and condensed in the second evaporator 2b and / or the refrigerant is condensed in one or both of the first evaporator 2a and the second evaporator 2b. When it is configured to be switchable at least with the cycle, the air-conditioned space can be air-conditioned at constant temperature and humidity. For example, when the second humidifier 5b is a steam blowing system, the first evaporator inlet air temperature / humidity is higher than the desired air supply humidity and the first evaporation relative to the desired air supply humidity. When the temperature of the inlet air is low and the humidity is high, the temperature is reduced by cooling with the first evaporator 2a and then heated by the second evaporator 2b, or the temperature is reduced by the first evaporator 2a. Then, the temperature is adjusted by heating with the second evaporator 2b, and then humidified without lowering the temperature with steam, and controlled to a predetermined temperature and humidity. When the first evaporator inlet air temperature / humidity is lower than the desired temperature and humidity, the second humidifier 5b is heated and adjusted in both or one of the first evaporator 2a and the second evaporator 2b, and then the second humidifier 5b. The steam is humidified without reducing the temperature with steam and controlled to a predetermined temperature and humidity. In this case, after heating in the first evaporator 2a, humidifying in the first humidifier 5a, and further heating in the second evaporator 2b, and then the temperature is not lowered by steam in the second humidifier 5b. It is also possible to control to a predetermined temperature and humidity. When the temperature of the first evaporator inlet air is high and the humidity is low with respect to the desired supply air temperature and humidity, the temperature is adjusted by drying and cooling in both or one of the first evaporator 2a and the second evaporator 2b, and then by steam. Humidification is performed without lowering the temperature, and control is performed to a predetermined temperature and humidity.

  In this case, the air-conditioned space can be dehumidified and dried without stopping the first and second humidifiers 5a and 5b. For example, when the temperature of the first evaporator inlet air temperature is high with respect to the desired air temperature and humidity, and when the temperature of the first evaporator inlet air is low and the humidity is high with respect to the desired air temperature and humidity, the first evaporator 2a. When the first evaporator inlet air temperature and humidity is lower than the desired temperature and humidity, both the first evaporator 2a and the second evaporator 2b Or it heats by one side and it controls to predetermined supply air temperature humidity.

  In the embodiment of FIG. 5, the control means controls the capacities of the first and second heat pumps A and B, the blowers 6 and 7, and the first and second humidifiers 5a and 5b, and the first. When it is configured to be at least switchable between a cycle in which the refrigerant is evaporated in both or one of the evaporator 2a and the second evaporator 2b and a cycle in which the refrigerant is condensed in the first evaporator 2a and the refrigerant is evaporated in the second evaporator 2b The air-conditioned space can be humidified at a low temperature. For example, when the first evaporator inlet air temperature / humidity is higher than the desired temperature and humidity, the first evaporator 2a and / or the second evaporator 2b is cooled and dehumidified to obtain the desired temperature and humidity. On the other hand, when the temperature and humidity at the inlet of the first evaporator is low, the air is heated by the first evaporator 2a and then humidified and then dried and cooled to control to a predetermined temperature and humidity. When the temperature of the first evaporator inlet air is high and the humidity is low with respect to the desired air temperature and humidity, the air is humidified and then dried and cooled only by the second evaporator 2b, and controlled to a predetermined air temperature and humidity.

  The present invention is not limited to the above-described embodiments, and can be freely changed in design without departing from the gist of the present invention. For example, the first and second heat pumps A and B, the configuration of the control means, the first evaporator The change and increase / decrease of the cycle of refrigerant evaporation and refrigerant condensation of 2a and the second evaporator 2b are free.

The front view which shows the Example of a heat pump type air conditioner. The simplified explanatory drawing of a heat pump. The simplified explanatory drawing of a water flow mechanism. The front view which shows the other Example of a heat pump type air conditioner. The simplified explanatory drawing of the heat pump of FIG.

Explanation of symbols

2a 1st evaporator 2b 2nd evaporator 3 condenser 5a 1st humidifier 5b 2nd humidifier 7 air blower 9 air supply air passage 12 heat source water circuit 13 washing device 16a heat source water inlet passage 16b heat source water outlet passage 17 with plug Connection port 18 On-off valve 19 Strainer 20a Cleaning liquid inlet path 20b Cleaning liquid outlet path A 1st heat pump B 2nd heat pump D Water flow mechanism E Cleaning flow path F Heat source flow path

Claims (10)

  First and second compression heat pumps A and B, and first and second humidifiers 5a and 5b, and the first evaporator 2a for refrigerant-air heat exchange of the first heat pump A and the above The first humidifier 5a, the second evaporator 2b for refrigerant-air heat exchange of the second heat pump B, and the second humidifier 5b are sequentially arranged in the air blowing direction, and one condenser 3 is arranged in the first direction. A heat pump type air conditioner which is shared by the heat pump A and the second heat pump B, and the evaporators 2a and 2b of the first and second heat pumps A and B are configured to be capable of switching between refrigerant evaporation and refrigerant condensation. Machine.   A cycle in which the refrigerant is evaporated in one or both of the first evaporator 2a and the second evaporator 2b, a cycle in which the refrigerant is evaporated in the first evaporator 2a and the refrigerant is condensed in the second evaporator 2b, and the first evaporator 2a and the second evaporator 2b or at least one cycle of refrigerant condensation, or a cycle in which refrigerant is evaporated in the first evaporator 2a and refrigerant is condensed in the second evaporator 2b and It is possible to switch between at least one cycle in which the refrigerant is condensed in both or one of the first evaporator 2a and the second evaporator 2b, or a refrigerant in both or one of the first evaporator 2a and the second evaporator 2b. 2. The heat pump according to claim 1, wherein the cycle can be switched at least between a cycle for evaporating and a cycle for condensing refrigerant in the first evaporator 2a and evaporating refrigerant in the second evaporator 2b. Air conditioner.   The heat pump type air conditioner according to claim 1 or 2, wherein the second humidifier 5b is of a steam blowing type.   The condenser 3 is a plate-type refrigerant-heat source water heat exchanger, and the refrigerant flow passage of the first heat pump A, the refrigerant flow passage of the second heat pump B, and the heat source water flow passage in the condenser 3 can exchange heat with each other. The heat pump type air conditioner according to claim 1, 2 or 3 disposed.   The heat pump type air conditioner according to claim 4, further comprising a water passage mechanism D that allows the heat source water from the heat source water circuit 12 and the cleaning liquid from the cleaning device 13 to selectively flow to the condenser 3.   A water flow mechanism D is separately provided in the heat source water inlet passage 16a and the heat source water outlet passage 16b for connecting the heat source water circuit 12 and the condenser 3, and the heat source water inlet passage 16a and the heat source water outlet passage 16b. The connecting ports 17 and 17 with plugs that can connect / separate the cleaning liquid inlet path 20a and the cleaning liquid outlet path 20b of the apparatus 13 and the cleaning apparatus 13 and the condenser 3 are connected by the cleaning liquid inlet path 20a and the cleaning liquid outlet path 20b. The heat pump type air conditioner according to claim 5, further comprising: on-off valves 18 and 18 for shutting off the inflow of heat source water into the cleaning flow path E configured by the operation.   The strainer 19 is provided in the common part of the heat source flow path F formed by connecting the heat source water circuit 12 and the condenser 3 by the heat source water inlet path 16a and the heat source water outlet path 16b and the cleaning flow path E. Heat pump air conditioner.   The condenser 3 is a refrigerant-air heat exchanger, and the refrigerant flow passage of the first heat pump A and the refrigerant flow passage of the second heat pump B in the condenser 3 are arranged so that they can exchange heat with each other. The heat pump type air conditioner according to 2 or 3.   The heat pump type air conditioner according to claim 8, further comprising a condensing fan 7 capable of adjusting the condenser surface wind speed to adjust the surface wind speed of the condenser 3 to 4.0 to 6.0 m / s.   10. The heat pump type air conditioner according to claim 1, wherein the heat exchanger of the first and second heat pumps A and B is a fin tube for refrigerant-air heat exchange and is an elliptic tube. Heat pump air conditioner.

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