JPH06213484A - Controller for ice heat accumulating cold water and hot-water supplier - Google Patents

Abstract

(57) [Abstract] [Object] To provide a control device for an ice heat storage chiller-heater, and particularly to provide a control device that accurately controls the amount of heat in the heat storage tank and that enables smooth operation without waste. [Structure] A flow sensor 1, 2, 3, a water level sensor 4, a heat pump, and a relay that operates a replenishing device, and accurately measures the amount of heat in a heat storage tank even if the water level inside the ice heat storage device fluctuates. [Effect] Stable operation can be performed even if the water level inside the heat storage tank changes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ice heat storage chiller / heater, and more particularly to an ice heat storage chiller / heater control device for accurately measuring the amount of heat storage.

[0002]

2. Description of the Related Art A conventional ice heat storage device measures the amount of heat storage by increasing the water level and the water temperature.

A related example of this type is disclosed in Japanese Patent Laid-Open No. 3-91633.

[0004]

In the above-mentioned prior art, the amount of water stored in the apparatus is unchanged in order to store the set amount of heat stored, and the amount of stored heat is calculated from the water temperature and the changing water level. Therefore, when the water level in the device changes and the water level drops, more heat is stored than necessary, and when the water level rises due to the return water, the required amount of heat may not be stored. In addition, the heat storage tank cannot be replenished with water due to the decrease in the amount of water.

It is an object of the present invention to accurately measure the amount of heat stored in the heat storage tank to accurately store the amount of heat stored at night to a target value.

[0006]

In order to achieve the above object, the present invention measures the current amount of water in the ice storage device by measuring the present amount of water, the amount of water flowing into the device and the amount of water flowing out of the device. Accurately measure the heat storage amount by calculating the water level rise due to.

[0007]

A micro control unit (hereinafter abbreviated as MCU) mounted on the ice heat storage chiller / heater controller measures the water level in the heat storage tank and the flow rate into and out of the device. When storing heat,
Completion of heat storage is determined by calculating the amount of water held in the heat storage tank and the amount of increase in water amount due to heat storage and comparing it with a preset water amount.

Further, when the water level in the heat storage tank is lowered, the heat storage tank is replenished with water and the amount of makeup water is added to the amount of water held in the heat storage tank to accurately grasp the amount of water held.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

At the heat storage start time, the MCU 7 excites the relays 9, 10, 11 via the driver 8 to put the heat pump 10 into the heat storage mode with the individual relay contacts 901, 101, 110, activate the heat pump 13 and switch the valves to store the heat. The MCU that starts operation is the inflow flow rate from the sensor 1,
The flow rate from the sensor 2 and the water level in the heat storage tank from the sensor 3 are transferred to the MCU via the interface circuit 5 and the A / D converter 6.
The MCU to be taken into is the current water quantity L1 and the inflow water quantity L2.
The current water quantity L1 is calculated from the outflow water quantity L3.

[0011]

L1 = L1 + L2-L3 (Equation 1) The heat storage amount M3 is calculated from the remaining heat storage amount M1 and the target heat storage amount M2 in the heat storage tank.

[0012]

## EQU00002 ## M3 = M2-M1 (Equation 2) The water level rise L5 is calculated from the heat storage amount M3 and the heat storage tank cross-sectional area A1.

[0013]

[Formula 3] L5 = (M3 / A1) * α (Formula 3) α: coefficient Here, the heat storage operation completion water level L6 is calculated from the current water level L7 and the water level rise L5.

[0014]

[Equation 4] L6 = L7 + L5 (Equation 4) Here, the water level rises by performing the heat storage operation. If the increased water level becomes equal to or higher than the heat storage operation completion water level L6, the heat storage operation is completed.

[0015]

[Equation 5] Heat storage is completed by L7 ≤ L6 (Equation 5) When the water level inside the heat storage tank is lowered due to various conditions such as water leakage from a valve or natural evaporation, the relay 12 is excited via the driver 8. Then, the water replenishing device 14 is moved by the relay contact 121 to replenish the heat storage tank with water. The amount of replenished water is taken into the MCU from the flow rate sensor 4 via the interface circuit 5 and the A / D converter 6. MC
U makes the relay 12 non-excited through the driver 8 when the taken flow rate L8 reaches the specified water amount L9, and the replenishing device 1
Stop 4 and stop water supply. The amount of retained water L1 in the heat storage tank is calculated from the flow rate L8 flowing into the heat storage tank.

[0016]

[Equation 6] L1 = L1 + L8 (Equation 6) The remaining heat storage amount M1 at the time when the replenishment of water is completed is used to recalculate Equations 2, 3, and 4 to determine the completion of heat storage by Equation 5. As a result, the required amount of heat can be stored even if a replenishment operation is performed.

Next, the ice storage cold / hot water machine body will be described with reference to FIG. During air conditioning, the heat storage tank water and the water returned from the load are mixed to maintain a constant water temperature, and the water is pumped to the load. When the amount of heat stored in the heat storage tank is exhausted and the prescribed water temperature cannot be sent to the load side with the water in the heat storage layer, the heat pump is operated to cool the water by the heat exchanger and send cold water to the load side.

At the time of heat storage, a heat pump is operated to flow a liquid of 0 ° C. or less into the pipe inside the heat storage tank. As a result, the temperature of the water inside the heat storage tank decreases, and when the water temperature falls below 0 ° C. When ice is generated around the pipe, which is generated as ice around the pipe, the internal volume of the heat storage tank increases and the water level in the heat storage tank rises. The heat storage is completed when the water level increases above the specified water level.

[0019]

According to the present invention, when the water level fluctuates due to some factor, or when the water level is lowered and water is replenished, the specified heat can be stored during the heat storage. Even at this time, the amount of heat inside the heat storage tank can be accurately grasped, so that wasteless operation can be performed.

[Brief description of drawings]

FIG. 1 is a block diagram of a control device.

FIG. 2 is a flowchart of the present invention.

FIG. 3 is a block diagram of ice heat storage.

[Explanation of symbols]

1, 2, 3 ... Flow rate sensor, 4 ... Water level sensor, 5 ... Interface circuit, 6 ... A / D converter.

Claims (1)

[Claims] 1. An ice heat storage chiller / heater that operates a heat pump by night-time power to perform heat storage operation to form ice in the heat storage tank and use the amount of heat stored during the daytime for air conditioning to determine the heat storage amount in the heat storage tank. An ice heat storage cold / hot water machine characterized by measuring the amount of water held in the heat storage tank by the amount of water held, the amount of water flowing into the heat storage tank, and the amount of water flowing out of the heat storage tank, and accurately measuring the water level rise due to heat storage and the water temperature. Control device.