JP2010065926A - Method of controlling cold/warm water in air conditioning system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem wherein, in many cases, an energy saving means of an air conditioning system to fully open a flow control valve of a fan-coil unit cannot be adapted to an air conditioning facility such as existing hotel and hospital because flow control valve is not provided in each fan coil unit, and additional installation cost is required to mount new flow control valves. <P>SOLUTION: In a method of controlling cold/warm water of an air conditioning system, rotational frequency of a rotational frequency control-type cold/warm water pump for sending cold/warm water, generated in a cold/warm water heat source machine, to a plurality of fan coil units etc. having ventilation amount control means is controlled based on the state of ventilation amount adjusted by each of the ventilation amount control means. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cold / hot water control method for an air conditioning system.

As an air conditioning system using a chilled / hot water heat source device, a cooling water piping system and a chilled / hot water piping system are connected to the chilled / hot water heat source device, and a cooling water pump and a cooling tower are connected to the cooling water piping system to circulate the cooling water. In addition, the cold / hot water piping system has a cold / hot water pump controlled by an inverter (the discharge amount is controlled by changing the number of revolutions of the pump), and a secondary air conditioning system comprising a plurality of air conditioners, fan coils, etc. A system that is connected in parallel and in which cold / hot water is supplied from the cold / hot water pump to each of the secondary air conditioning facilities is a system that has been generally used.
In this system, a flow rate adjustment valve is provided in each of the chilled / hot water pipes of each secondary side equipment. Among the flow rate adjustment valves, the flow rate adjustment valve has the largest valve opening degree. It has been proposed to save energy by controlling the water supply pressure of the cold / hot water pump so as to be almost fully open (see Patent Document 1).
Japanese Patent Application Laid-Open No. 2007-315695.

The conventional technique shown in Patent Document 1 has the following problems.
First, in hotels, hospitals, etc., many fan coil units, which are secondary side air conditioning equipment, are installed, but each of these fan coil units is often not provided with a flow control valve. There has been a problem that the prior art cannot be applied as it is to air conditioning facilities such as hotels and hospitals.
Furthermore, in order to apply the conventional technology to existing air conditioning facilities such as hotels and hospitals, a flow rate adjustment valve is newly attached to each of the fan coil units. In this case, an additional flow rate adjustment valve is added. In addition to the problem of installation costs, there were problems that the use of hotel rooms, hospital rooms, etc. were restricted during the additional installation work of the flow control valve, or that air conditioning could not be used.

The present invention has been made to solve the above-described problem, and a method for controlling hot / cold water in an air conditioning system capable of appropriately controlling a hot / cold water pump regardless of the presence or absence of a flow regulating valve in a secondary air conditioning facility. The purpose is to provide.
Furthermore, the other object of this invention is to provide the cold / hot water control method of an air conditioning system which can aim at energy saving, without performing additional installation of a special instrument.

The invention described in claim 1
A plurality of air conditioners having a ventilation amount adjusting means for adjusting the air flow stepwise or steplessly, a secondary air conditioner such as a fan coil unit, etc., and each of the secondary air conditioners is generated by a hot / cold water heat source machine. In the cold / hot water control method of the air conditioning system provided with the rotational speed control type cold / hot water pump for feeding the cold / hot water,
The number of revolutions of the cold / hot water pump is controlled based on the ventilation amount state information adjusted by the ventilation amount adjusting means.

The invention described in claim 2
The number of rotations of the cold / hot water pump is controlled based on the total ventilation rate of the ventilation rate adjusted by the ventilation rate adjusting means.

The invention according to claim 3
The air flow rate adjusting means for adjusting the air flow rate in stages is characterized by four levels of strong air volume, medium air volume, weak air volume, and stop.

  The present invention collects air volume information of an air volume adjuster for adjusting the blown air volume, which is provided in an air conditioner, a fan coil unit, or the like that air-conditions (cools or heats) an air-conditioned space using cold / hot water. Since the number of revolutions of the chilled / hot water pump is controlled based on the collected air volume information, the number of revolutions of the chilled / hot water pump can be optimally controlled even in the air conditioner or the fan coil unit not provided with the flow rate adjusting valve. Therefore, it has an energy-saving effect, and the rotation speed of the cold / hot water pump is optimally controlled by using the equipment provided in the fan coil unit etc. Cost advantage not required.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a system diagram applied to an air conditioning system of a type that does not include a flow rate adjustment valve in the cold / hot water piping of each fan coil unit.
FIG. 2 is a flowchart showing an example of the inverter control method of the cold / hot water pump.
The air conditioning system shown in FIG. 1 includes a cold / hot heat source unit 1, a cooling water pump 2, a cold / hot water pump 3, a cooling tower 4, a supply side header 5, a return side header 6, a plurality of fan coil units 7, a central monitoring unit 8, and a cold temperature. An inverter 9 for a water pump is provided, and the cold / hot heat source machine 1 is an absorption cold / hot water machine.

Each of the fan coil units 7 has four stages of “strong”, “medium”, “weak”, and “stop” for the amount of ventilation by the coil through which the cold / hot water is passed, the fan through which the surroundings of the coil are passed, and the fan. A quantity adjuster 10 is provided.
The air flow adjuster 10 includes a temperature detection sensor 11 for the air-conditioned space (indoor) and a target temperature value setting device (not shown). The target temperature value and the temperature detection sensor 11 set in advance by the target temperature value setting device are used. The temperature of the air-conditioned space is set to the target value by controlling the air flow to “strong”, “medium”, “weak”, and “stop” according to the magnitude of the deviation from the temperature of the air-conditioned space that is measured from time to time. It is close.

The plurality of fan coil units 7 are connected in parallel between the supply header 5 and the return header 6.
The central monitoring unit 8 takes in the air flow rate information of the air volume adjuster 10 of each fan coil unit 7 and calculates the required amount of cold / hot water and the number of rotations of the cold / hot water pump 3 based on the taken air flow rate information. The inverter 9 is controlled.
Furthermore, the central monitoring unit 8 controls the operation of the cooling / heating source 1, the cooling water pump 2, the cooling / heating water pump 3, and the cooling tower 4 connected to the cooling / heating source 1 through pipes. Monitor and monitor the operating status of each room and the temperature and humidity of each room.

Next, an example of the control method of the cold / hot water pump 3 in this embodiment is demonstrated based on FIG.
When the power is turned on at the start (step S1), the cold / hot water pump 9 rotates at a predetermined initial rotation speed (for example, 70% of the maximum rotation speed) (step S2). It is determined whether a predetermined time T1 seconds (for example, 60 seconds) from the start of rotation, that is, whether the initial operation of the fan coil unit 7 has elapsed (step S3), and when it is determined that the determination has not elapsed. Repeat the above steps until

  When the predetermined time T1 seconds elapses in the determination in step S3, the ventilation amount state information is acquired from each fan coil unit (step S4), and the fan whose “air flow amount state” is “strong” in the collected information. It is determined whether or not there is a coil unit (step S5). If it is determined in the determination that there is a fan coil unit whose “air flow amount state” is “strong”, “air flow” that is “strong” is determined. It is determined whether or not the duration of the “quantity state” has continued for a predetermined time T2 seconds (for example, 120 seconds) (step S6).

  If the determination in step S6 is that the predetermined time T2 seconds has not elapsed, the process returns to step S4, the routine of steps S4, S5, and S6 is repeated, and the “strong” air flow rate state is set. When the predetermined time T2 is continued, the number of rotations of the cold / hot water pump 3 is increased by ΔN1 (for example, 5%) (step S7), and if the control such as power-off is not finished (step S10), step S4 Returning to step 3, the steps are repeated to monitor the air flow rate state.

  On the other hand, when there is no fan coil unit 7 whose “air flow rate state” is “strong” in step S5, that is, in step S6, the flow returns to step S4 without continuing for a predetermined time T2 seconds or more. When it is determined that the “state” is not “strong” and the “air flow rate state” is only “medium” or “weak” in step S5, the air flow rate state is equal to or longer than a predetermined time T3 seconds (for example, 120 seconds). It is determined whether or not it is continued (step S8), and when it is determined that the determination is continued, the number of rotations of the cold / hot water pump 3 is decreased by ΔN2 (for example, 3%) (step S9), If control such as power off is not finished (step S10), the process returns to step S4.

If the determination in step S8 is that T3 seconds have not elapsed, since the rotational speed of the cold / hot water pump is still changing, the process returns to step S4, and this step is repeated to determine whether the ventilation amount state is Monitor.
The above steps S4 to S10 are repeated at predetermined time intervals, and the number of rotations of the cold / hot water pump 3 is controlled based on the air flow rate state information.

上記諸元の「Ｎｏ」はファンコイルユニット７を示し、能力係数Ａは、Ｎｏ１のファンコイルユニット７の冷却（加熱）能力を１としたときのＮｏ２〜Ｎｏ５の各ファンコイルユニット７の冷却（加熱）能力を係数で表したものである。 Next, another example of the inverter control method of the cold / hot water pump will be described based on Table 1 below.
First, specifications of a plurality of fan coil units 7 constituting the air conditioning system shown in Table 1 will be described.

“No” in the above specifications indicates the fan coil unit 7, and the capacity coefficient A indicates the cooling of each fan coil unit 7 of No 2 to No 5 when the cooling (heating) capacity of the fan coil unit 7 of No 1 is 1. (Heating) ability is expressed as a coefficient.

Similarly, the air flow rate state B indicates whether the air flow rate at a certain point in operation is operating in a “strong”, “medium”, “weak”, or “stop” state.
Similarly, the air flow rate state coefficient C affects the ratio of the air flow rate, that is, the cooling (heating) capacity of the fan coil unit 7 in the operating state, and is 1 when the air flow rate state is “strong” and “stop”. Is 0, “medium” is 0.5, and “weak” is 0.3.
Similarly, the operating ventilation amount D is a capacity coefficient A × a ventilation amount state coefficient C. When the cooling (heating) capacity of the No. 1 fan coil unit 7 is used as a reference, each operating fan coil unit 7 actually performs. The cooling (heating) capability during operation, that is, the cooling (heating) capability of No. 1 fan coil unit 7 is indicated.

Next, the meaning of the table will be described.
Speaking of the capacity coefficient A, an air conditioning system is constituted by five fan coil units, and the maximum cooling (heating) capacity in the system is No. 1 fan coil unit as described in the total column as 8. 7 (8) cooling (heating) capacity.

  Next, with regard to the operating air flow rate D, as described above, the air flow rate state B changes the operating cooling (heating) capacity of the operating fan coil unit, so the cooling (heating) of the fan coil unit 7 is performed. By multiplying the capacity by the air flow rate state coefficient C indicating the air flow rate state B, the fan coil unit 7 that is actually operating is in operation when the cooling (heating) capability of the No. 1 fan coil unit 7 is used as a reference. The cooling (heating) capacity will be shown.

Therefore, 3.1 in the total column of the operation ventilation amount D means that this air volume system is the cooling (heating) capability during operation of 3.1 units of the No. 1 fan coil unit 7 in the full operation state. It will be driving in.
As a result, the cold / hot water pump 3 is not a rotational speed corresponding to the maximum cooling (heating) capacity of eight fan coil units 7 of No. 1 but 3.1 / 8≈0.4, that is, an air conditioning system. It will drive | operate with the rotation speed corresponding to 40% of the largest total driving | operation ventilation amount in.

In short, at a predetermined time interval, the central monitoring unit 8 collects information on the air flow rate state B (strong, medium, weak, stop) of the air flow rate regulator 10 of each of the fan coil units No. 1 to No. 5, and the capacity coefficient A It is an air conditioning system which calculates | requires the ratio of the sum total of the operation ventilation volume D with respect to a total, and controls the rotation speed of the cold / hot water pump 3 by the inverter 9 based on the said ratio.
Since the capacity coefficient A and the air flow rate state coefficient B of each fan coil unit 7 may change depending on the specifications and installation environment of the fan coil unit 7, the coefficient value can be changed.

In the above-described embodiment, the air flow adjustment of the air flow adjuster 10 has four stages of “strong”, “medium”, “weak”, and “stop”, but the air flow of the air flow adjuster 10 is stepless. It may be something that can be changed.
In that case, the ventilation amount can be variably controlled steplessly in accordance with the magnitude of the deviation between the preset target temperature value and the temperature of the air-conditioned space that is measured by the temperature detection sensor 11 as needed. This has the effect of reducing the divergence.

  Moreover, in the said embodiment, although the ventilation amount regulator 10 of the fan coil unit 7 demonstrated what has a temperature detection sensor, the ventilation amount regulator which is not equipped with the temperature detection sensor, ie, the ventilation amount manually. The cold / hot water control method of this air conditioning system can be applied to the type of fan coil unit to be selected, and the same effect can be expected.

It is the schematic of the air conditioning system concerning one Embodiment of this invention. It is a flowchart of the inverter control method of a cold / hot water pump.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cold / hot heat source machine 2 Cooling water pump 3 Cold / hot water pump 4 Cooling tower 5 Supply side header 6 Return side header 7 Fan coil unit 8 Central monitoring unit 9 Inverter 10 Ventilation amount regulator 11 Temperature detection sensor

Claims (3)

A plurality of air conditioners having a ventilation amount adjusting means for adjusting the air flow stepwise or steplessly, a secondary air conditioner such as a fan coil unit, etc., and each of the secondary air conditioners is generated by a hot / cold water heat source machine. In the cold / hot water control method of the air conditioning system provided with the rotational speed control type cold / hot water pump for feeding the cold / hot water,
Cooling / hot water control method for an air conditioning system, wherein the rotation speed control of the cooling / heating water pump is controlled based on the ventilation amount state information adjusted by the ventilation amount adjusting means.   A method for controlling hot / cold water in an air conditioning system, wherein the rotational speed control of the cold / hot water pump is performed based on a total ventilation rate of the ventilation rate adjusted by the ventilation rate adjusting means.   The cold / hot water control for an air conditioning system according to claim 1 or 2, wherein the air flow rate adjusting means for adjusting the air flow rate in four steps is a strong air amount, a medium air amount, a weak air amount, and a stop. Method.

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