JPH02157556A - Air conditioner selection method - Google Patents

Abstract

PURPOSE:To shorten the time of data acquisition and to make possible low cost selection by selecting and determining the number of refrigerators and spray humidifiers to be used in a condition to control heating and humidifying heaters on the basis of measured results of an air condition of a supply opening and an inlet port of an air conditioner. CONSTITUTION:A sensible heat factor for showing the heat load quantity in a chamber C and the change of an air condition in an air conditioner AHU is found on the basis of blowdown air temperature t1 detected by a temperature sensor 41, intake air temperature t2 detected by a temperature sensor 42, set temperature and set relative humidity. Next, the number of refrigerators to be used is one at first and a necessary spray humidifying quantity is calculated on the basis of measured data, a refrigerating capacity and the like. The number of humidifiers to be used is determined by the measured humidified quantity and the humidifying capacity of a spray humidifier. Next, a dehumidification quantity DEHU by the refrigerators is calculated to compare with the humidified quantity by all the used spray humidifiers so as to increase the number of the spray humidifiers to be used if there is enough DEHU or the number of the refrigerators if there is limited DEHU. The margin of the control of the output of heating and humidifying heaters is allowed to determine the number of the use of the refrigerators and the spray humidifiers.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for selecting air conditioning equipment suitable for obtaining a desired temperature and humidity in a space to be controlled.

(Prior Art) Air conditioning equipment in an air conditioner for obtaining a desired temperature and humidity in a space that requires temperature and humidity control, such as an artificial climate chamber and a constant temperature constant temperature chamber, or a space that requires temperature and humidity control, such as a general building, is used to control the temperature,
It must be able to quickly and comfortably reach the humidity and maintain that 't+'l humidity.

Conventionally, the selection of appropriate air conditioning equipment, such as the required number of refrigerators, humidifiers, etc., has been carried out using a device selection table prepared in advance based on various measurement data, that is, the desired control They relied on a selection chart that allowed them to select the appropriate air conditioning equipment according to temperature, controlled humidity, and expected heat load.

(Problem to be solved by the invention) However, in order to make the machine H selection table more detailed and accurate, it would be necessary to collect a lot of data to create the table, which would require a lot of effort and increase costs. I did.

In addition, even though it takes time and effort to create such a system, when there is a change in the amount of heat load, it is not possible to promptly change equipment selection in response to the change, or the amount of heat load cannot be predicted. There was a problem in that it was impossible to respond to unknown cases.

Therefore, the present invention requires less time to collect data than the conventional method of using an air conditioning equipment selection table, resulting in lower costs.Moreover, the present invention can handle unknown heat loads even in response to fluctuations in heat loads. It is an object of the present invention to provide an air conditioning equipment selection method that can select an appropriate air conditioning equipment in a short time.

[Means to solve the problem]

In accordance with the above object, the present invention provides a humidifier that heats and evaporates water using a refrigerator, a heater for 8 temperature zones, a heater for 7J old crystals, and a number of spray humidifiers selected from the range of 0 to n (positive integer). An air conditioner selection method in an air conditioner that obtains a target temperature and humidity in a space to be controlled by temperature and humidity by controlling the outputs of both heaters, the method comprising: a) an air outlet and a suction port of the air conditioner facing the space to be controlled by temperature and humidity; b) Calculating the amount of heat load Q in the space based on the measurement result; C) Determining the sensible heat ratio SHF indicating a change in the air condition in the air conditioner. , d) the heat load IQ, the refrigerating capacity of the refrigerator determined to be used,
Based on the number of refrigerators determined to be used REF, the sensible heat ratio SHF, and the latent heat of vaporization of water EVA, the required spray humidification amount SSPRAY is determined.
e) determining the required number of spray humidifiers from the calculated SSPRAY value and the humidification amount of the spray humidifier; [) calculating 1 DIEHU of dehumidification by the refrigerator; g) the DEHU and Humidification with spray humidifier 1
Determine the size of sPRAY, and if there is room for DEHU, increase the number of spray humidifiers and suppress the output of the humidifying heater; h) After step g), use the DEHU and the spray humidifier determined to be used. Humidification amount SPRA
Determine the size of Y, and if DEHU≦SPRA Y, increase the number of refrigerators by a predetermined number and execute steps d), e), f), and g) again, and
If it is SPRAY, calculate the necessary heater output OUT; i) When the heater output OUT is calculated in step h), determine the magnitude relationship between the output OUT and the predetermined minimum output of the heater. If OUT≦the minimum output, increase the number of spray humidifiers by a predetermined number and execute steps f), g), and h) again; The present invention provides an air conditioner selection method characterized by including the step of setting the number of air conditioners to be used as the number determined so far.

Here, the term "spray humidifier" refers to a humidifier that can generate load sensible heat using the latent heat of vaporization of water, and specifically includes spray type humidifiers that spray water droplets, ultrasonic humidifiers, etc. is possible. The number of spray humidifiers is 0xn (positive integer)
selected from the range.

That is, no spray humidifier is used, or at least one is used if necessary.

Further, the number of refrigerators REF is initially determined to be one, for example, and the number is increased as necessary.

Necessary spray humidification amount SSPRA in step d)
When calculating Y, it is not necessary to take into account the humidification efficiency S P E F of the spray humidifier, but it can be taken into account if necessary.

(Function) According to the method of the present invention, the air condition at the outlet and inlet of the air conditioner, that is, the temperature or (/M degree and humidity) is measured, and the temperature and humidity control 1 is performed based on the measurement results.
1 The amount of heat load in the target space is determined, and the number of refrigerators and the number of separately provided spray humidifiers to be used are selected while leaving room for heating and humidification heater output control based on the heat load. It is determined.

〔Example〕

Hereinafter, a method according to an embodiment of the present invention will be described along with an example of an apparatus for carrying out the method.

First, an example of the device will be described with reference to FIG. 2. There is an artificial climate chamber C as a temperature-humidity controlled space, and an air conditioner AHU is connected to the chamber C.

The air outlet 1 of the air conditioner AHU is located on one side wall 3 of the chamber C.
In the upper part of the chamber C, the suction ports 2 are respectively connected to the lower part of the side wall 3 of the chamber C.

A temperature sensor 41 and a humidity sensor 51 face the air outlet l, and a temperature sensor 42 faces the air inlet 2.

Further, a microcomputer M is prepared, and an input/output interface 7 is connected to the computer.

The temperature signal from the temperature sensor 41 is sent to the temperature indication controller T I
The humidity signal from the humidity sensor 51 is input to the humidity indicator controller HIC. The indication regulators TIC and HIC are each connected to an interface 7.

The signal from the temperature sensor 42 is input directly to the interface 7.

Although not shown, a plurality of refrigerators having the same refrigerating capacity are prepared, and the cooler of each refrigerator is connected to the air conditioner A.
) [located within U.

In the air conditioner AHtJ, a plurality of spray type humidifiers (not shown) having the same humidifying capacity are further arranged, and a temperature control heater whose output can be controlled is also arranged. Furthermore, a steam humidifier of a type that evaporates water by heating a humidifying heater whose output can be controlled is provided. A blower 6 is provided at the top toward the outlet l.

How many of these refrigerators and spray humidifiers are to be operated is determined by instructions from the computer M. Also,
The amount of humidification by the Aoi humidifier used and the output of the heating heater are controlled based on the set (target) temperature indicated by the temperature indicator controller TIc and the set (target) humidity indicated by the humidity indicator controller HIC. .

The heat load inside chamber C can be broadly divided into sensible heat load and latent heat load.More specifically, sensible heat load due to heating elements, latent heat load due to moisture, heat intrusion from the outside, etc. are considered. However, for the sake of explanation,
Consider only the sensible heat load.

Now, the method according to the embodiment of the present invention using such an example of the apparatus is the first method.
Follow the steps shown in the figure. Note that this procedure is executed on computer M.

First, in step Sl, the amount of heat load Q in the chamber C is calculated based on the blown air temperature tl detected by the temperature sensor 41 and the suction air temperature L2 detected by the temperature sensor 42. This calculation is performed using the following formula.

Q = (12-t 1)
73+t 1) 1860xαt Here, (α,
60×α2 is the amount of other heat that takes into consideration the heat that enters the device AHU itself, and α2 is a value when expressed in kW.

Next, in step S2, the humidification efficiency (SPEF) of the spray humidifier is determined from the set temperature and humidity. This is because the humidifying efficiency of a spray-type power dispenser is affected by the ambient temperature and humidity.

More specifically, it is calculated by substituting the set temperature and humidity into the linear equation using the following equation which relates the experimental value as a function of the temperature and humidity of the space air to be sprayed.

In step S3, the intake air temperature t2 detected by the temperature sensor 42, the set temperature T, and the set relative humidity Φ
The relative humidity φ2 at the suction port 2 is calculated from the following equation.

Here, when the air temperature is t, This is an approximation formula for the saturation curve on the diagram.

In this example, the set temperature T and the set relative humidity Φ are used in the above equation for convenience, but the blown air temperature t1 and the relative humidity φ1 of the blown air may also be used.

Next, in step S4, based on the suction port air temperature L2 and the humidity φ2 obtained in step S3, the air conditioner AH
The sensible heat ratio SHF, which indicates the change in the state of the air flowing from the inlet 2 to the outlet 1 of U, and more specifically, the change in the state of the air on the surface of the cooler, is determined. In this example, in order to simplify the calculation, the calculation is performed as follows.

In other words, the previous saturation curve far.

Now, when the intake air temperature is L2 and the relative humidity is φ2, P=f (t) from the point (12, φ2) on the psychrometric diagram.
Draw a tangent to the curve of
a, φa) is ia1.If the enthalpy at the intersection of lines parallel to the temperature axis and the absolute humidity axis from each point is ib, then the enthalpy at each point is as follows.

There is no problem.

Therefore, 1a=0. 24. ta Here, substitute ta=L2-i (i=t, 2, . . .), and the minimum value that satisfies Ai≦0 becomes ta.

X (U, 44 -tl ±b so 1.3) and the sensible heat ratio is 5SPIINAY≦X, then SPRAYN=O3S
If PRAY≦2X, then SPRAYN=ISSPI?
If AY≦3×, SPRAYN=secondary step S
5, the number of refrigerators to be used is first determined to be 1.

In step S6, the heat load Q, the refrigerating capacity of one refrigerator QREF, the number of refrigerators REF (initially 1), the sensible heat ratio SHF, the latent heat of evaporation of water EVA, and the humidification efficiency 5PEF
Based on the required spray humidification amount S S P RAY = (Q-QRP, FXREFXSHF) / (EVA
xsPEF).

In step S7, the humidification amount S S determined in step S6 is
From P RAY and the humidifying capacity of one spray type humidifier, the number of humidifiers to be used S P RAYN is determined from the back of the number of humidifiers 1-n (positive integer) provided as follows.

That is, if the humidification amount of one spray humidifier to be used is defined as X, then once the number of spray humidifiers to be used is determined in this way, the dehumidification amount DEHU by the refrigerator is calculated in step S8. This calculation is performed using the following formula.

Here, σ1 is a correction item depending on the surface condition of the cooler (Tala).

Next, in step S9, the amount of humidification S PRA Y by all the spray humidifiers to be used is compared with the above-mentioned D E HU, and if there is a margin in D E II U, the number of spray humidifiers S P R Y N is determined. and, as a result, suppress the heater output of the steam humidifier.

Now, if the humidification amount of one spray type humidifier is X and the maximum humidification capacity (humidification amount) of a steam humidifier is Mmax, DEHU-3PRAYNxX-Mmax If x<X, ci
, SPRAYN=SPRAYN+1 DEHU-3PRAYNXX-Mmax c if x<2X
i, SPRAYN=SPRAYN+2 Increase the number of spray humidifiers SPRAYN.

In step SIO, the DEHU and the amount of spray humidification by all the spray type humidifiers determined to be used are determined, and the DEHU is determined.
Determine whether HU＞Spray humidification amount SPRAY, and select rYE.
If it is sJ, the process advances to step 312, but if it is rNOJ, the step 311 decides to increase the number of refrigerators used REF by one more and returns to step S6, and from step S6 to step SlO. In this way, while increasing the number of refrigerators used one by one,
Until it is determined that DEHU>SPRAY in IO,
Steps 86 to 10 are repeated, and then the process advances to step S12.

In step S12, the required heater output OU1'' is calculated from 0UT=QREFxREF (DEI(tJ-3PRAY):x:640).

After that, in step S13, it is determined whether OUT>860xσ2. here 860
×σ2 is the minimum heater output necessary for control, and σ2
is a numerical value when expressed in kW.

This judgment is to see whether there is room to control the heater output.

If the determination in step S13 is rYEsJ, the air conditioner AHU is operated with the number of refrigerators and the number of spray humidifiers determined in the previous steps. But rN
If it is OJ, the number of spray humidifiers is set to 1 in step S14.
A decision is made to increase the number of units, and the process returns to step S8.

If rYES in step S13, the process returns to step S31.

In this way, the necessary and appropriate number of refrigerators and spray humidifiers can be determined depending on the constant, variable, or unknown heat load in chamber C and the set temperature and humidity while leaving room for controlling the output of the heating heater and humidifying heater. can be determined.

Moreover, the data that must be prepared in advance is small, such as the air volume of the blower, the freezing capacity of the refrigerator, and the amount of humidification of the spray humidifier. Since the sensor installed in the air conditioner AHυ can be detected while the air conditioner AHυ is in operation, the effort required to collect data can be reduced.

In addition, since the air condition at the outlet 1 and inlet 2 of the air conditioner A HU is constantly measured, even if the heat load in the chamber C fluctuates or is initially unknown, the necessary and appropriate refrigeration The number of machines and humidifiers can be determined.

Note that the present invention is not limited to the above embodiments,
It can be implemented in various other ways.

For example, in the above embodiment, the relative humidity φ2 of the air conditioner AHU suction port is used as the sucked air temperature L2 and the set temperature and humidity,
Although it is calculated from φ, such calculation is not necessary when a humidity sensor is installed in the suction port 2 in advance and a humidity signal from the sensor is used.

Furthermore, in the above embodiment, the number of refrigerators and humidifiers was selected and determined assuming that there is only a sensible heat load in the chamber C, but if there is also a latent heat load in the chamber C, this is also added to the heat load. An appropriate number of refrigerators and humidifiers may be selected and determined.

Is it necessary to add spray in the above example? Although the humidification efficiency of the spray humidifier is taken into consideration in calculating WffiSSPRAY, the method of determining the humidification efficiency does not necessarily have to be based on the formula in the above embodiment, and may be determined using other methods.

Further, the sensible heat ratio does not necessarily need to be calculated using the calculation method of the embodiment described above, and may be calculated using another calculation formula or a direct psychrometric diagram.

Furthermore, although the above embodiment assumes that each refrigerator has the same cooling capacity and each spray humidifier has the same humidifying capacity, for example, multiple refrigerators with different cooling capacities are installed in the air conditioner AHU. When equipped, one refrigerator has the capacity of the first refrigerator to be operated, and for refrigerators added later as necessary, the number of refrigerators corresponds to the number of refrigerators that are added as needed. The calculation result may be used as the number of additional refrigerators REF. The same applies to spray humidifiers.

(Effects of the Invention) According to the present invention, compared to relying on conventional air conditioner selection tables, the time required to collect data is shorter, and therefore the cost is lower. It is possible to provide an air conditioning equipment selection method that can quickly select an appropriate air conditioning equipment even for a heat load.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing the procedure of a method according to an embodiment of the present invention, and FIG. 2 is a schematic explanatory diagram of an example of an apparatus used to carry out the method of the present invention. C.../l! l Humidity controlled chamber, AHLI...
・Air conditioner, l...Blowout port, 2...Suction port. Applicant Tapai Espec Co., Ltd.

Claims (1)

[Claims] (1) Control the output of both heaters using a refrigerator, a temperature control heater, a humidifier that heats and evaporates water using a humidifier heater, and a number of spray humidifiers selected from the range of 0 to n (positive integer). A method for selecting an air conditioner in an air conditioner to obtain a target temperature and humidity in a space to be controlled by temperature and humidity, the method comprising: a) measuring air conditions at an outlet and an inlet of the air conditioner facing the space to be controlled by temperature and humidity; b) calculating the amount of heat load Q in the space based on the measurement results; c) determining the sensible heat ratio SHF indicating a change in the state of the air in the air conditioner; d) the amount of heat load Q; Refrigeration capacity determined by the refrigerator used,
Based on the number of refrigerators determined to be used REF, the sensible heat ratio SHF, and the latent heat of vaporization of water EVA, the required spray humidification amount SSPRAY is determined.
e) determining the required number of spray humidifiers from the calculated SSPRAY value and the humidification amount of the spray humidifier, f) calculating the dehumidification amount DEHU by the refrigerator, g) the DEHU and Determine the magnitude of the humidification amount SPRAY by the determined spray humidifier, and if there is a margin in DEHU, increase the number of spray humidifiers and suppress the output of the humidifying heater; h) After step g), Determine the magnitude of the humidification amount SPRAY by the DEHU and the determined spray humidifier,
If DEHU≦SPRAY, increase the number of refrigerators by a predetermined number and repeat steps d), e), f), and g).
i) When the heater output OUT is calculated in step h), a predetermined minimum value between the output OUT and the heater output OUT is calculated. Determine the magnitude relationship of the output, and if OUT≦the minimum output, increase the number of spray humidifiers by a predetermined number and execute steps f), g), and h) again, and if OUT>the minimum output, refrigerate. 1. A method for selecting air conditioning equipment, comprising: setting the number of humidifiers and spray humidifiers in use to the number determined so far.