JPS62162838A - Heat storage quantity detecting device of ice heat storage type heat source unit - Google Patents

Abstract

PURPOSE:To make it possible to conduct an efficient operational control by converting an output signal of a load cell into an ice forming quantity to compute a latent heat storage quantity, and computing the ice coating quantity of a latent heat storage quantity from a detection signal of water temperature detection means thereby to continuously detect the total heat storage quantity of heat storage tank. CONSTITUTION:A load cell 9 provided at an ice making heat exchanger 2b within a heat storage tank 2 measures a buoyancy accompanied by the ice forming using as a reference value O a state where ice is not coated on the outer periphery of a cooling pipe of an ice making heat exchanger 2b, and an output signal of said load cell 9 is inputted to a microcomputer 11. The quantity of ice being coated is converted from the buoyancy at the computing part of the computer 11 to compute the latent heat storage quantity. Further, the detection signal of a temperature detecting end 10a of a water temperature sensor 10 is inputted to the microcomputer 11 to compute the sensible heat storage quantity of water 7 within the heat storage tank 2. The latent heat storage quantity and the sensible heat storage quantity are totalled, and the total storage heat quantity in the heat storage tank 2 is detected. The value of thus obtained heat storage quantity is outputted as a current signal, and is sent to the control system of the heat source device, and thus the ice storage operation and the space heating operation are carried out efficiently.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a device for detecting the amount of heat stored in an ice storage type heat source. The present invention relates to a heat storage amount detection device for an ice storage type heat source device suitable for continuously detecting the amount of heat stored in the ice storage type heat source device.

[Background of the invention]

In recent years, with the increase in electricity demand, the disparity in electricity load between day and night has tended to widen, and the development of thermal storage air conditioning systems, which are effective as a measure to level out electricity demand, is being promoted as an important technical issue.

For example, Hitachi Review V○L, 66, Na 6 (
1984-June) pages 17 to 20 contain a technical report entitled "Unit type ice storage heating and cooling system" by Masahiro Oguri et al. 6 The air-cooled heat pump chiller unit in the report is
There are three types of heat exchangers: a water-side heat exchanger that produces cold and hot water during the day, an ice-making heat exchanger in a heat storage tank that produces water (summer) or hot water (winter) during the night, and an air-side heat exchanger that exchanges heat with outside air. It consists of a heat exchanger, liquid receiver, accumulator, compressor, etc.

A heat source device equipped with such an ice storage tank is advantageous in terms of space saving and is easy to handle. In order to control the operation of equipment with higher efficiency, and to protect against damage to the structure due to excessive icing, it has become necessary to develop a device to detect the amount of heat stored. Ta.

[Purpose of the invention]

The present invention was made in view of the actual state of the prior art described above, and enables efficient operation control of an ice storage type heat source device by continuously and highly accurately detecting the amount of ice produced and the amount of heat stored in a heat storage tank. The object of the present invention is to provide a heat storage amount detection device for an ice storage type heat storage device, which can be used as a means of protecting structures from damage due to excessive icing.

[Summary of the invention]

7-Calorific value detection bag of ice storage type heat source device according to the present invention; (τ
The structure includes a load cell that is disposed in an ice-making heat exchange section in a heat storage tank and measures the buoyancy of the ice-making heat exchange section that changes due to ice formation, and a water temperature detection means that detects the water temperature in the heat storage tank. , arithmetic control means for calculating the amount of latent heat storage by converting the amount of icing from the output signal of the load cell, and calculating the amount of sensible heat storage from the detection signal of the water temperature detection means; This makes it possible to continuously detect sensitivity.

In addition, I would like to add the idea behind developing the present invention.

It is as described in the following.

There are two ways to measure the amount of ice produced: one method is to determine the thickness of ice that grows in the cooling tubes of an ice-making heat exchanger, and the other method is to determine the amount of ice that has grown in the cooling pipes of an ice-making heat exchanger, and the other method is to determine the amount of ice produced by sensing changes in the physical state caused by the difference in specific gravity between water and water.

The present invention is based on the latter idea, and detects the buoyancy of the cooling pipe due to icing as the amount of state change. That is, since ice has a lower specific weight than water, ice in water produces buoyancy. Therefore, if the weight change of the cooling pipe group in the heat storage tank is captured, it can be converted into ice making weight.

With the Xi calorific value detection device according to the present invention, the temperature of the water inside the folding heat box can also be detected! 2! The total amount of waste heat is detected by knowing the latent heat storage tank and the amount of sensible heat storage.

[Embodiments of the invention]

First, an example of a heat source device of an air-cooled heat pump water storage heating and cooling system to which the present invention is applied will be explained with reference to FIG.

FIG. 2 is a schematic configuration diagram of a heat source unit of a general air-cooled heat pump/water storage/heating system.

In Fig. 2, 1 is an air-cooled heat pump type chiller unit (hereinafter simply referred to as a chiller unit), 2 is a heat storage tank that stores heat for ice making and hot water using low and high temperature brine obtained from this chiller unit 1, and 3 is a chiller unit. 1
Cooled by low, high temperature brine, obtained from ? ! ! A brine/water heat exchanger for obtaining water; 4 is a brine pump installed in the brine piping and circulates the brine; 5 is a pipe connecting the brine/water heat exchanger 3 and the load side. These cold and hot water pumps are arranged in the heat source bag Pf6 for the load side.

The heat storage tank 2 has an ice-making heat exchanger 2b formed by molding a polyethylene tube into a serpentine shape, for example, into a tank body 2a made of synthetic resin and a heat insulating material. The cooling pipe of vessel 2b is connected to the brine pipe.

In FIG. 2, the brine piping system is shown by a dashed line, and the cold and hot water piping systems are shown by a solid line. The thick black arrows shown along the brine piping system indicate the flow of brine during night heat storage operation, and the thick self-arrows indicate the flow of brine during cooling and heating operation.

In the ice storage operation, the low temperature brine obtained by the chiller unit 1 is guided to the ice making heat exchanger 2b of the heat storage tank 2 as shown by the thick black arrow, and the chiller unit 1 and the ice making heat exchanger 2 are
The water in the tank body 2a of the heat storage tank 2 is cooled by circulating the water in the brine pipe connecting the ice-making heat exchanger 2b via the brine pump 4, and ice is formed on the outer periphery of the cooling pipe of the ice-making heat exchanger 2b.

This ice storage operation basically stores ice at night, when power consumption is low, and then melts the ice and radiates heat during the day when the air conditioning load is high.

During cooling operation (cooling operation), the low-temperature brine obtained by the chiller unit is guided to the brine/water heat exchanger 3 as shown by the thick white arrow, bypasses the heat storage tank 2, and is circulated through the brine pump 4. , the return water from the load side that enters the brine/water heat exchanger 3 is cooled, and the cooled water is sent to the load side via the cold/hot water pump 5, such as a fan coil unit of an air conditioner (not shown). supply to.

In addition,? S ripe heat operation. In the case of air conditioning operation, the brine obtained by the chiller unit 1 is at a high temperature, and the flow of brine in FIG. 2 is the same as that in ice storage operation and cooling operation, so the explanation thereof will be omitted.

Next, an embodiment of a heat storage amount detecting device for making ice and managing the heat storage amount in the heat storage tank in the heat source device of the air-cooled heat pump type ice storage air-conditioning system will be described with reference to FIG.

The first part is a configuration diagram of a heat storage amount detection device according to an embodiment of the present invention, and the numbers of the heat sink parts are the same as those of the parts in FIG. 2 above.

In FIG. 1, 7 is water in the tank body 2a of the heat storage tank 2, and 7a indicates the surface of the water, that is, the water level.

8 shows only a portion of the water that landed on the outer periphery of the cooling pipe of the ice-making heat exchanger 2b.

Reference numeral 9 denotes a load cell that is disposed in the ice making heat exchanger 2b section in the heat tank 2 and detects the buoyancy of the cooling tube group related to the ice making heat exchange section, which changes when ice forms on the cooling tube group. be. This load cell 9.

The purpose is to measure the buoyancy, or weight loss, caused by ice making by assuming a state in which no ice has formed on the cooling pipe group.

]O was similarly placed in the heat storage tank 2. A water temperature sensor 10a detects the temperature of the water 7, and a temperature detection end thereof is shown.

These load cells9. The water temperature sensor 10 is a commercially available product and can be easily installed in the 79 heat tank 2.

1] is a microcomputer associated with a calculation control means that calculates the amount of latent heat and sensible heat storage from the output signal of the load cell 9 and the detection number of the water temperature sensor 10, respectively, and calculates the total heat storage amount.

12 is a connection box provided between the load cell 9 and the microcomputer 11; 13 is provided in the control circuit of this heat source device, and amplifies the output signal of the load cell 9 and inputs it to the calculation section of the microcomputer 11. The amplifier 14 is also provided in the control circuit of the heat source device and is a converter for inputting a detection signal from the temperature detection terminal 10a of the water temperature sensor 10 to the calculation section of the microcomputer 11.

In the figure, broken lines indicate input from the power supply and output signals from each device, and solid arrows indicate the functions of the arithmetic control circuit within the microcomputer 11 in a block diagram.

The operation of such a heat storage amount detection device will be explained.

The load cell 9 provided in the ice-making heat exchanger 2b section in the heat storage tank 2 has a reference value O when no ice has formed on the outer periphery of the cooling pipe of the ice-making heat exchanger 2b, and the load cell 9 has a reference value O when no ice has formed on the outer periphery of the cooling pipe of the ice-making heat exchanger 2b. Do you measure buoyancy or weight loss? ! +11 and input the output signal to the microcomputer 11. Then, the calculation section of the microcomputer 11 converts the amount of ice formation, that is, the amount of ice made, from the buoyancy, and further calculates the amount of latent heat storage from the amount of ice made.

Further, a detection signal from the temperature detection end 10a of the water temperature sensor 10 is input to the microcomputer 11, and the amount of sensible heat stored in the water 7 in the heat storage tank 2 is calculated. Then, the total amount of heat storage in the heat storage tank 2 is detected by adding up the amount of latent heat storage and the amount of sensible heat storage.

The obtained heat storage amount value is output as a 4-4-2O current (ff) and is sent to the control system (not shown) of the heat source device 6 (see Figure 2), which controls ice storage operation, cooling operation, etc. Efficiency.

According to this embodiment, changes in the amount of ice made can be detected continuously and with high precision, so it can be used to detect the amount of ice accretion and the amount of heat storage in the ice storage type heat source device, and the efficiency of the lj heat tank can be measured. It is possible to carry out practical operation control. It can also be used as a protection device from structural damage due to excessive icing.

Furthermore, load sensor 9. Commercially available products can be used as the water temperature sensor 10 and the like, and the intended purpose can be achieved with a relatively inexpensive, one-time device.

In the above-mentioned embodiment, an example of a heat source device of an air-cooled heat pump type ice storage air-conditioning system that stores ice through brine has been described, but the present invention is not limited to this, and the present invention can be applied to an air-cooled heat pump that does not use brine. Ice cream? ! It can also be applied generally to heat source devices of I-thermal heating and cooling systems.

[Effects of the Invention] As described above, according to the present invention, it is possible to continuously and highly accurately detect the amount of water produced and the amount of heat stored in the heat storage tank, and to efficiently control the operation of the ice storage type heat source device. In addition, it is possible to provide a heat storage amount detection device for an ice storage type heat source device that can also be used as a means for protecting the structure value ttt due to excessive icing.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a heat storage amount detection device according to an embodiment of the present invention, and FIG. 2 is a schematic block diagram of a heat source unit of a general air-cooled heat pump type ice storage/cooling device.

Claims (1)

[Claims] 1. A load cell that is disposed in the ice-making heat exchange section in the heat storage tank and measures the buoyancy of the ice-making heat exchange section that changes due to ice formation, and a water temperature detection means that detects the water temperature in the heat storage tank. , arithmetic control means for calculating the amount of latent heat storage by converting the amount of icing from the output signal of the load cell, and calculating the amount of sensible heat storage from the detection signal of the water temperature detection means, the total amount of heat storage in the heat storage tank; 1. A heat storage amount detection device for an ice storage type heat source device, characterized in that it is configured to be able to continuously detect.