JPS60149835A - Water supply temperature control device in air conditioning installation - Google Patents

Abstract

PURPOSE:To contrive to control the individual room temperature under constant condition and control the water temperature returned from a heat exchanger to a heat accumulating tank under nearly constant condition by a method wherein the water supply temperature adjusted for a heat exchanger performance is controlled individually for each system in case of the overload of the heat exchanger or the capacity shortage of a heat source generating apparatus. CONSTITUTION:A cold/hot water generating apparatus 1 (the primary system) such as a cooler unit or a heater and heat exchangers 7, 8 (the secondary system) arranged in each room are connected to a heat accumulation tank 5. A water supply pump 2 and water supply pumps 11, 12 are respectively connected to the primary and secondary systems. The cold/hot water generating apparatus 1 and the inside of the heat accumulation tank 5 are connected by a pipe 4. A part of the pipe 4 is branched off a pipe 4a and a pipe 4b at the A part thereof, the pipe 4b is communicated to the intermediate part of a pipe 9 from the heat exchanger 7 to the heat accumulation tank 5 via a flow rate control valve 14. The flow rate control valve 14 is given the cold/hot water temperature T2, T4 flowed through the pipes 9, 10, then controls the valve open/close operation so that the temperature difference between T2 and T4 is kept under the constant value.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a water supply temperature control device in an air conditioning facility, which is provided with a plurality of heat exchangers.

(Prior art) In air conditioning equipment, cold and hot water (chilled water or hot water) is circulated from a heat source generating device for cooling or heating, such as a tala unit or a boiler, to a heat storage tank, and from this heat storage tank, a plurality of heat exchangers for air conditioning are used. There is a type that sends water to each heat exchanger (hereinafter referred to as a heat exchanger). , FIG. 1 shows this type of air conditioning equipment in a case where there are two heat exchangers, 1 is a heat source generating device, 2 is a water pump, and 3.4 is a pipe (pipe line). The pipe 3 is the cold and hot water 6 inside the heat storage tank 5.
The pipe 4 forms a waterway on the side that takes in water, and the pipe 4 forms a waterway on the side that discharges cold and hot water from the heat source generating equipment 1 to the heat storage tank 5.7. These heat exchangers 7, which are arranged separately in two places,
8, the side that receives cold and hot water 6 from the heat storage tank 5 is a pipe 9.1.
It opens into the heat storage tank 5 at 0, and there is a water pump 11 in the middle.
．． 12 are connected.

One pipe 13 is commonly connected to the cold and hot water discharge side. In this device, the heat source generating device 1 and the water pump 2 are operated to maintain the cold and hot water in the simmering tank 5 at a predetermined temperature. Air conditioning equipment having the same heat storage tank and heat source generating equipment has the following problems. That is, when there are a large number of heat exchangers, for example, there are two groups of 20 heat exchangers, for a total of 40 heat exchangers. It is also assumed that the design margins of the coils in the heat exchanger are largely different between the two groups. in this case.

Since water is sent to multiple heat exchangers from one heat storage tank,
Even if the temperature of the water sent to the two groups is the same, the capacity of the heat exchanger is different, so the area where the heat is actually exchanged is different, and there is a difference in the air temperature, resulting in a difference in indoor temperature. become. The above is not a problem when the air conditioning load can be controlled individually, but it becomes a problem when the load exceeds % capacity and cannot be controlled. In addition to the problem of different indoor temperatures, the temperature of the return water from the heat exchanger to the heat storage tank varies greatly, so there is
There is also the problem of so-called mixed water.

(Objective of the Invention) The present invention was made to solve the above-mentioned problems of the prior art.
Alternatively, when the capacity of heat source generation equipment is insufficient, by individually controlling the water supply temperature for each system according to the capacity of the heat exchanger, the temperature in separate rooms can be controlled at a constant level, and It is an object of the present invention to provide a device that makes the temperature of water returned from a heat exchanger to a heat storage tank almost constant and does not disturb the temperature stratification of the heat storage tank. In order to achieve this, hot and cold water is circulated from the heat source generating equipment to the heat storage tank, and the water is sent from the heat storage tank to each air conditioning heat exchanger. In an air conditioning installation having a plurality of heat exchangers, a part of the pipe line that sends water from the heat source generation device to the heat storage tank is communicated with the pipe line connecting any heat exchanger and the heat storage tank, and the communication section is also provided. A flow control valve is provided between the heat exchanger and the heat exchanger. And this flow control valve is
The water supply temperature of each yarn path is determined and the water is supplied at a constant temperature difference (implementation row). The description will be given with the same reference numerals. First, like the one in FIG. 1, the heat storage tank 5 is equipped with a cold/hot water generating device 1 such as a cooler unit or a boiler (these are referred to as primary systems).

This is accomplished by heat exchangers 7 and 8 (these are referred to as secondary systems) provided in each chamber. The number of heat exchangers is not limited to two, and may be multiple. In the primary system, there is a water pump 2, -1'
Water pumps 11 and 12 are connected to the next system.

Similar to the one in Figure 741, pipe 4 connects to cold and hot water generating equipment 1.
and the inside of the heat storage tank 5, a part of which branches into pipes 4a and 4b at A nμ, and the pipe 4b is a pipe 9 that connects the heat exchanger 7 to the heat storage tank 5 via the flow rate control valve 14.
It is connected to the middle part. The flow control valve 14 controls the temperature T2 of the cold and hot water flowing through the pipes 9 and 1o. Incorporate T, 1
The opening/closing operation is performed so that the difference between the two becomes α (a constant value). 1
5 is a control device for this purpose.

Next, the operation of this device will be explained theoretically.

Now, the water pump 2 is indicated by Pl, the water pump 11 is indicated by P2, and their conveyance flow rates are respectively Q□.

Q2-Water supply temperature is T and T2. In addition, the flow distribution in part A is set to X to the water pump P2 side, and to the heat storage tank 5 side (1
-x) and the amount pumped from the heat storage tank 5 by the water pump P2 to Q20. In addition, the cold and hot water that can be used for cooling and heating in the heat storage tank 5 is designated as Q4, and the temperature before mixing from the primary system is designated as T3. The temperature after mixing is assumed to be T4. However, Q4 is Q engineering.

Since the flow rate is extremely large compared to the flow rate of QゎQ20, there is no change in flow rate before and after mixing from the primary system, and the flow rate is assumed to be almost constant.

From the above seven equations, the following four equations are established.QIX+Q2
0 ・・・・・・・・・・・・・・・・・・・・・・・・
...... (1) T, -T2=α (constant value)...
・・・・・・・・・・・・−・・・・・・(2) Kokote variable (
unknown) is X + Q20 p T2 + T3,'
r.

The constant is Q + Q2 t Q4 + T
There are 5 pieces, 5, 1, 2, and 5. Since four equations are established for five variables, fixing any one variable determines the other four variables, and the circuit in Figure 2 is a system with a completely fixed water supply temperature. becomes. Here 1i&fr of X:
This is determined by the flow rate control valve 14 in FIG.

Other variables Q20 r T2 + T3 t 'r, holder, each heat exchanger 7°8 (in case of multiple as mentioned above;
), water can be fed with the water temperature difference α.

(Effect of the invention) Since the present invention is constructed as explained above, 1
The following effects may be achieved ■ When the temperature of the air conditioning system cannot be controlled (when the load exceeds the capacity of the heat exchanger, or when the capacity of the heat source generation equipment is insufficient), the same system can be used for air conditioning zones with different capacities. Air conditioning can be done depending on the temperature ■ In the case of (■) above, the temperature of the water returned from the heat exchanger to the heat storage tank is almost uniform, so the temperature stratification of the heat storage tank is maintained, and there is no loss due to mixed water, etc.

■ Even if the temperature of the air conditioning system is controlled, the above two advantages can be taken advantage of and the system can be used as is, without having to make any changes to the temperature difference, etc.

(2) As described above (2) to (3), the water supply temperature side fI can be set in accordance with the consumption load of the heat exchanger as an air conditioner, and power saving can be achieved with the open type and closed type rice bowl characteristics. ) In short, water can be delivered at different temperatures from the same thermal storage tank.

[Brief explanation of drawings]

FIG. 1 is a system diagram of a conventional air conditioning system, and FIG. 2 is a system diagram of an embodiment of the present invention. ■... Heat source generation equipment 2, 11.12... Water supply bonder 3.4, 9, 10.13... Pipe 5... Heat storage tank 6... Cold and hot water 7, 8... Heat exchange Container 14...Flow control valve 21 Figure 2 Figure 2

Claims (1)

[Claims] (1) Cold and hot water is circulated from the heat source generating equipment to the heat storage tank, and the water is sent from the heat storage tank to each air conditioning heat exchanger. In an air conditioning system having a plurality of heat exchangers, a part of the pipe line that sends water from the heat source generating device to the heat storage tank is connected to a pipe line connecting an arbitrary heat exchanger and a heat storage tank, and the communication part and A water supply temperature control device for air conditioning equipment, characterized in that a flow control valve is provided between a heat exchanger.