JPH01114636A - Air conditioner - Google Patents

Abstract

PURPOSE:To enable a humidifying process through water spraying to be carried out in a higher temperature and low relative humidity circumstance and reduce a loss of discharged amount of water in case of performing a humidifying operation by a method wherein a heat exchanger is arranged to be connected between an air supplying duct for supplying air to an air conditioned room and an outdoor air duct for introducing fresh air at their intermediate locations and then the supplied air after its heat exchanging operation is blown into a room. CONSTITUTION:External air O fed from an outdoor air duct is heat exchanged with supplied air with a heat exchanger 7 and its temperature is increased. Indoor air R passes via a returning duct 5, a part of it is discharged and the remaining air is guided to a main body 9 of an air conditioner and mixed with heat exchanged air OH. Then, it is cooled and heated by a heating coil 3, it is humidified with a water spray type humidifier 2. Since its evaporating latent heat is removed, the air is cooled and humidified. Then, the air gives heat to the heat exchanger 7 through the fed surrounding atmosphere and the air is blown into a room through an air supplying duct 4.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an air conditioner used for air conditioning in residential spaces such as office buildings and stores.

BACKGROUND OF THE INVENTION In recent years, most buildings in which business is conducted have been equipped with air conditioning equipment, and as a result, there has been a strong demand for equipment with low operating costs.

As shown in FIG. 3, this kind of conventional air conditioner has a fan 1o inside the main body 10o of the air conditioner that blows air into the room.
1. Water spray humidifier 102 used for humidification, cooling and heating coil 1 for cooling or heating static air blown into the room
o3, and the air conditioner body 100 still includes an air supply duct 104 that guides air that is blown into the room from the fan 101 for air conditioning, and a return air duct 105 that guides return air from the room. Outside air duct 1 that guides fresh outside air
It was configured by connecting 06.

Problems to be Solved by the Invention In the conventional configuration described above, the temperature and humidity conditions at each stage of air conditioning during the heating season are expressed as points on the psychrometric chart as shown in FIG. Here, the cooling and heating coil 10
The air H' heated by 3 is passed through a water spray humidifier 10.
2, the temperature is humidified and cooled almost along the constant wet bulb temperature line to the state S', and the relative humidity changes from h'h to h'g. All of the sprayed water does not evaporate; some of it drips and is discharged outside the machine as wastewater.

Room heating load (t', -t;) xo, 24-G
G: Expressed in weight air volume (K9/h), and when the air volume is constant, it is proportional to the temperature difference between point R' and point 87. Therefore, when the heating load is small, the temperature at point 87 is relatively low, but the relative humidity at point 87 to obtain the same indoor temperature and humidity condition R' increases, so the evaporation rate of water spray decreases and the humidifying water This has the problem that it is often used in vain.

The present invention is intended to solve these problems, and aims to provide an air conditioner that improves the humidification efficiency of water spray and effectively utilizes humidification water.

Means for Solving the Problem In order to solve this problem, the air conditioner of the present invention includes an air conditioner main body, and a fan inside the air conditioner main body that blows air for conditioning the room. a water spray type humidifier that humidifies the air to be conditioned; and a cooling/heating coil to cool or heat the air to be conditioned; It has a return air duct that leads fresh outside air into the main body, an outside air duct that also leads fresh outside air into the main body, and an air supply duct that leads the air blown from the fan into the room. They are cross-connected in the middle, and a heat exchanger for exchanging heat between outside air and supply air is provided at the cross-connected portion.

According to the present invention, with the above configuration, the supply air duct and the outside air duct are cross-connected, and a heat exchanger is provided at the connection part to exchange heat between the outside air introduced air and the supply air, thereby achieving a humidification process. The temperature condition of the heat exchanger increases, and the amount of water dripped and lost when spraying humidification using a sprue type humidifier decreases.

Embodiment FIG. 1 is a block diagram showing an embodiment of an air conditioner according to the present invention. In Fig. 1, inside the air conditioner main body e, there is a fan 1 that blows air for air conditioning into a room 8, a water spray humidifier 2 that humidifies, a cooling device that cools or heats the air to be conditioned, A heating coil 3 is provided. A heat exchanger 7 that exchanges heat between outside air and supply air is located between an air supply duct 4 that is blown from a fan 1 and supplied into a room 8, and an outside air duct 6 that takes in fresh outside air into the air conditioner body 9. They are connected so that they intersect and exchange heat.

A return air duct 5 for returning air from the outside air duct 6 and the indoor air 8 is still connected to the suction portion of the air conditioner main body 9.

FIG. 2 is an psychrometric diagram showing the air conditioning process in an embodiment of the air conditioner of the present invention.

The heating process of air conditioning will be sequentially explained according to FIGS. 1 and 2.

The outside air introduced from the outside air duct is heat exchanged with the supply air in the heat exchanger 7, and the temperature increases from 70 to t. h and rise to O
It becomes H.

A portion of the indoor air R is exhausted via the return air duct 6,
The rest is led to the air conditioner body 9 and heat exchanged outside air ○
It is mixed with H and becomes air at point M. Next, the air is cooled and heated by the heating coil 3, and the temperature rises from tm to th, becoming air at point H.

Next, the air is humidified by the water spray humidifier 2, but at the same time, the latent heat of vaporization is taken away, so that the air is cooled and humidified from point H to point SH on a line where the wet bulb temperature is approximately constant. and S
The air in state H is heated by a heat exchanger to the outside air.8
This becomes static electricity in the form of a point, and is blown into the room via the air supply duct 4.

Here, the process in the conventional air conditioner shown in FIG. 3 is shown using a broken line on the air line in FIG. 2.

Here, if the outside air conditions, indoor temperature and humidity conditions, indoor load conditions, circulating air volume, and outside air volume are the same, the start and end of humidification will be th-bi11=tsh compared to the conventional method.
It can be seen that this is performed at a position shifted to the right on the psychrometric diagram by -ts=Δt. Therefore, humidification is performed in a lower relative humidity region at point H than at point H' and at point SH than at point 8, and the water sprayed by the water spray humidifier 2 evaporates more easily and does not evaporate. The amount of water that drips becomes waste water and is discharged as waste water, which makes efficient humidification possible.

Effects of the Invention As described above, according to the present invention, the air supply duct that supplies air to the air conditioning room connected to the main body of the air conditioner and the outside air duct that introduces fresh outside air are intersected and connected in the middle to exchange heat. By installing a heat exchanger between outside air and heated supply air, and blowing the heat-exchanged supply air into the room, the humidification process using water spray can be performed at higher temperatures and with lower relative humidity. Can be performed in a humid environment. Therefore, the water sprayed for humidification is easily evaporated, and the water that drips without evaporation is drained, reducing the amount of water that is wasted and making it possible to use humidification water economically, which is a great practical effect.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of an air conditioner according to an embodiment of the present invention, Fig. 2 is an psychrometric diagram showing the air condition at each point in the air conditioner shown in Fig. 1, and Fig. 3 is a diagram of the air conditioner according to the conventional FIG. 4 is an air conditioning diagram showing the air condition at each point in the air conditioner shown in FIG. 3. 1...Fan, 2...Water spray humidifier, 3...Cooling/heating coil, 4...Air supply duct, 5... Return air duct, θ...
Outside air duct, 7... Heat exchanger, 8...
Indoor, 9... Air conditioner body. Name of agent: Patent attorney Toshio Nakao and 1 other person 4-
9' Guto 5-"Air shielding・I 6-Outside air... Busy-Air recitation 5 bodies Figure 2

Claims (1)

[Claims] An air conditioner main body, a fan that blows air for air conditioning into the room, a water spray type humidifier that humidifies the air for air conditioning, and an air conditioner for air conditioning. cooling or heating cooling,
a return air duct including a heating coil and guiding return air from the room into the air conditioner body; an outside air duct also guiding fresh outside air into the body; and a supply air duct guiding air blown from the fan into the room. The outside air duct and the supply air duct are configured such that both ducts are cross-connected in the middle, and a heat exchanger for exchanging heat between the outside air and the supply air is provided at the cross-connected part. Air conditioner.