JP5939082B2 - Operation method of heat pump type air conditioner - Google Patents

Description

  The present invention relates to a method for operating a heat pump air conditioner.

  In particular, in order to prevent indoor air from being dried too much in winter, there is an air conditioner including a humidifier that gives moisture to the air heated by the heat exchanger. In such an air conditioner, various countermeasures have been proposed in order to prevent humidification water and the like from being damaged by freezing of the humidifying water due to low-temperature outside air in the severe cold season (see, for example, Patent Documents 1 and 2). ).

  Patent Document 1 discloses an air conditioner including a total heat exchange type heat exchanger that exchanges heat between supply air and exhaust gas, freezing water droplets condensed in the heat exchanger, and In order to prevent freezing of the humidifying element arranged on the indoor side of the heat exchanger, the exhaust air volume is set larger than the supply air volume in accordance with the detection value of the temperature sensor that detects the temperature of the outside air sucked into the machine. It is described that the air volume control to be performed and the water supply / drainage control process for removing water from the humidifying element are performed.

  Patent Document 2 discloses an air conditioner equipped with an external air conditioner, and in order to prevent condensation or freezing of water or steam sprayed by a humidifier arranged in the building, It describes that the circulating air heated by the heat generated in the inside flows through the humidifier.

JP-A-11-304206 JP 2002-156148 A

  By the way, in a heat pump type air conditioner, defrost operation is periodically performed together with normal operation in order to prevent a decrease in operation efficiency due to frost adhering to the heat exchanger of the outdoor unit during winter operation. In the method of controlling the operation of the apparatus according to the outside air temperature in order to prevent the freezing of the vessel, there are cases where the apparatus cannot be restarted after the defrost operation for normal operation.

  FIG. 2 is a cross-sectional explanatory diagram of a heat pump type air conditioner of the all outside air type. In FIG. 2, a humidifier 12 is disposed on the downstream side of the heat exchanger 11, and a duct 14 is disposed on the suction side of the blower 13. A suction temperature sensor 15 is provided for detecting the temperature of the outside air introduced into the machine via the. In FIG. 2, reference numerals 16 and 17 denote an air filter and a blowing temperature sensor, respectively. During normal operation, when the detected value of the suction temperature sensor 15 becomes lower than a predetermined set value (for example, −5 ° C.), the operation of the apparatus is stopped to prevent the water in the humidifier 12 from freezing. Is done.

  In the air conditioner shown in FIG. 2, when the defrost operation is performed with the blower 13 stopped, air may flow backward from the positive pressure room during the defrost operation (see white arrows). When the air is cooled by passing through the heat exchanger 11 and the suction temperature sensor 15 detects air that has been cooled and lower than the predetermined temperature, even if the device is operated after the defrost operation is finished, Immediately after start-up, freeze prevention control is entered, and the apparatus cannot be operated normally.

  The present invention has been made in view of such circumstances, and prevents the normal operation of the device after the defrost operation from being prohibited by mistake due to the backflow of air from the positive pressure room. It aims at providing the operation method of the heat pump type air harmony device which can be performed.

(1) The operation method of the heat pump type air conditioner of the present invention (hereinafter also simply referred to as “operation method”) includes a blower, a heat exchanger, and a humidifier disposed on the downstream side of the heat exchanger. In order to prevent the humidifier from freezing, a first temperature sensor for detecting the temperature of the in-machine intake air is disposed on the upstream side of the heat exchanger, and the temperature of the air blown out of the machine is adjusted. A second temperature sensor to be detected is disposed on the downstream side of the heat exchanger, and is a method of operating a heat pump air conditioner that performs a normal operation and a defrost operation,
During normal operation, if the detected temperature of the first temperature sensor is smaller than a predetermined set value, the operation of the device is stopped,
At the end of the defrost operation, the apparatus is normally operated when the detected temperature of at least one of the first temperature sensor and the second temperature sensor exceeds the predetermined set value.

  In the operation method of the present invention, based on the detection values of both the first temperature sensor for detecting the temperature of the in-machine intake air and the second temperature sensor for detecting the temperature of the air blown out of the apparatus, for preventing the humidifier from freezing. It is determined whether or not the operation of the apparatus is to be stopped, and the apparatus is normally operated when the detected temperature of at least one of both temperature sensors exceeds a predetermined set value. Therefore, in the conventional operation method, the anti-freezing control is performed based only on the detection value of the first temperature sensor. Therefore, the first temperature is caused by the backflow of air from the positive pressure room after the defrost operation is completed. Although the sensor became lower than the predetermined set value and the apparatus could not normally operate, in the present invention, the detected value of the second temperature sensor (because it is the air temperature of the room before passing through the heat exchanger, Usually, it is higher than the predetermined set value), and when this detected value exceeds the predetermined set value, the apparatus is normally operated on the assumption that there is no fear of the humidifier freezing. Thereby, it is possible to prevent the normal operation of the apparatus after the defrost operation from being prohibited by mistake due to the backflow of air from the positive pressure room.

(2) In the operation method of (1), the first temperature sensor is disposed on a suction side of a blower disposed on an upstream side of the heat exchanger, and the second temperature sensor is disposed on the humidifier. It can arrange | position in the downstream of this.

(3) In the operation method of the above (1) or (2), the heat pump type air conditioner can be an all outside air system.

  According to the operation method of the present invention, it is possible to prevent the normal operation of the apparatus after the defrost operation from being prohibited by mistake due to the backflow of air from the positive pressure room.

It is a section explanatory view of an example of an air harmony device operated by a driving method of the present invention. It is a section explanatory view of an air harmony device showing backflow of air from a living room.

  Hereinafter, embodiments of an operation method of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is an explanatory cross-sectional view of an example of an air conditioner A operated by the operation method of the present invention. This air conditioner A is an indoor unit in an all-outside air conditioning system that heats and cools only the outside air without circulating return air from the room and supplies it to the room. In the casing C of the air conditioner A, the blower 3, the heat exchanger 1 and the humidifier 2 are arranged in this order from the upstream side of the air flow during normal operation (the outside air suction port side is the upstream side). It is arranged. As the humidifier 2, an appropriate type such as a water spray type or an evaporation type can be adopted.

  A suction temperature sensor (first temperature sensor) 5 that detects the temperature of the in-machine suction air is disposed on the wall of the casing C on the upstream side of the heat exchanger 1, more specifically on the upstream side of the blower 3. In addition, a blowout temperature sensor (second temperature sensor) 7 for detecting the temperature of the air blown outside the apparatus is disposed on the wall portion of the casing C on the downstream side of the heat exchanger 1, more specifically on the downstream side of the humidifier 2. Has been. Although not shown for simplicity, a drain pan for storing drain dripping from the heat exchanger 1 and a drain pump for discharging the drain accumulated in the drain pan to the outside of the apparatus are arranged in the casing C. It is installed.

  During the normal operation in winter of the air conditioner A having the above-described configuration, the outside air removed by the air filter 6 disposed in the suction side duct 4 is heated by the heat exchanger 1, and a humidifier is used as necessary. 2 is humidified and supplied to the living room via the outlet duct 8. During the normal operation in winter, when the suction temperature sensor 5 detects a temperature lower than a predetermined set value (for example, −5 ° C.), freezing of the humidifier 2, that is, freezing of moisture in the humidifier 2 is prevented. Therefore, the operation of the air conditioner A is stopped.

  During the defrost operation of the air conditioner A, the refrigerant cycle is switched, and the heat exchanger 1 functions as an evaporator. Therefore, the operation of the blower 3 is stopped to prevent cold air from flowing into the living room. In this case, if the room is at a positive pressure, the air from the room may flow back into the casing C as indicated by the white arrow in FIG. And the air which flowed back is cooled with the heat exchanger 1, and if this cooled air reaches the suction temperature sensor 5 vicinity, the said suction temperature sensor 5 will detect the temperature of this cold wind.

  In the conventional operation method, the anti-freezing control of the humidifier 2 is performed based only on the detected value of the suction temperature sensor 5, so that the temperature of the cold air is set to a predetermined set value (for preventing freezing). For example, if it is lower than −5 ° C.), the freeze prevention control is entered immediately after startup, and the apparatus cannot be operated normally.

  On the other hand, in the present embodiment, not only the detection value of the suction temperature sensor 5 but also the detection value of the blowout temperature sensor 7 (because it is the air temperature of the room before passing through the heat exchanger 1, Is higher than a predetermined set value), and when at least one of the detected values exceeds the predetermined set value, the apparatus is started and is normally operated assuming that there is no risk of freezing of the humidifier 2 . As a result, it is possible to prevent erroneous start-up of the device after defrost due to the backflow of air from the positive pressure room.

DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Humidifier 3 Blower 5 Suction temperature sensor (1st temperature sensor)
7 Blowout temperature sensor (second temperature sensor)
A Air conditioner C Casing

Claims (3)

A blower (3), a heat exchanger (1), and a humidifier (2) disposed on the downstream side of the heat exchanger (1), and freezing the humidifier (2). A first temperature sensor (5) for detecting the temperature of the in-machine intake air is provided upstream of the heat exchanger (1), and a second temperature sensor for detecting the temperature of the air blown outside the apparatus. (7) is disposed on the downstream side of the heat exchanger (1), and is a method of operating the heat pump air conditioner (A) that performs normal operation and defrost operation,
During normal operation, when the temperature detected by the first temperature sensor (5) is lower than a predetermined set value, the operation of the device (A) is stopped,
At the end of the defrost operation, the apparatus (A) is normally operated when the detected temperature of at least one of the first temperature sensor (5) and the second temperature sensor (7) exceeds the predetermined set value. The operation method of a heat pump type air conditioner (A).   The first temperature sensor (5) is disposed on the suction side of the blower (3) disposed on the upstream side of the heat exchanger (1), and the second temperature sensor (7) is disposed on the suction side. The operation method of the heat pump type air conditioner (A) according to claim 1, which is disposed on the downstream side of the humidifier (2).   The operation method of the heat pump type air conditioner (A) according to claim 1 or 2, wherein the heat pump type air conditioner (A) is an all outside air type.

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