JP3215716B2 - Measuring device for cold energy supply - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling medium which is required to be locally cooled, for example, a plurality of cooling loads installed on the ground, on a ship, or on a vehicle. Using a mixture of ice and snow water from which snow has been removed (ice and snow water mixture) and treating it as a cooling medium in which the mixing ratio of ice and snow water and the temperature of the cooling water fluctuate, the amount of latent heat held by the amount of ice and snow Also, the present invention relates to a device for measuring the total amount of true cold from a cold supply source to a plurality of cooling loads by integrating the total amount of heat with the amount of sensible heat held by the amount of water.

[0002]

2. Description of the Related Art Conventionally, in order to measure the amount of cold of an ice-snow water mixture fed by a liquid feed pipe, the flow rate of a cooling medium and the latent heat and sensible heat held by the liquid are always supplied at a uniform rate. Actually, when an ice-snow water mixture is used as the cooling medium, the ratio of the ice-snow water to the water and the temperature of the cooling water are not constant, and the amount of heat used is further measured. In doing so, the discharged water after using the latent heat is used as sensible heat, so even if this is added, the true calorific value is not calculated.

[0003]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above-mentioned conventional problems, and has been made in view of the above-mentioned problems. The problem is that the true total calorific value used cannot be clearly captured because the latent heat of water and the sensible heat of water are not grasped.

[0004]

In order to solve the above-mentioned problems, the present invention relates to an apparatus for integrating and measuring the amount of cooling heat of a cooling medium which is pressure-fed to a cooling load by a liquid feed pipe. In the flow path of the liquid sending pipe in which the ice-water mixture is pumped as a liquid, a measuring tube and a temperature measuring means of a Coriolis mass flowmeter using Coriolis force are provided, and the ice-water mixture is pumped. While flowing through the measuring tube of the Coriolis mass flow meter, an electric oscillation is applied to the measuring tube from an external oscillating means to detect a change in the resonance frequency or the phase thereof including the ice-snow water mixture in the measuring tube. Then, the ratio of the amount of ice and snow in the ice and snow water mixture is measured, the amount of latent heat and the amount of sensible heat of the cooling medium liquid are obtained based on the ratio of the amount of ice and snow, and supplied from the cold heat source based on the total amount of these two heats. Of the ice / water mixture It is characterized in that to measure the cold calorie. That is, by integrating the total heat amount of the cooling medium liquid composed of the ice-snow water mixture based on the latent heat amount and the sensible heat amount while sequentially calculating, the liquid is fed from the cold heat supply side by the liquid feed pipe to the cooling load. The total amount of heat of the whole ice-water mixture can be obtained, and the true total amount of heat including the amount of heat used by the cooling load and the amount of cold held by the discharged water after using the cold can be obtained and displayed.

As is well known, the Coriolis mass flowmeter detects and obtains a change in the resonance frequency containing liquid or its phase when electric vibration is applied from an external oscillating means to its measuring tube. The mass of the measuring tube
Assuming that p, the mass ML of the liquid to be measured flowing in the measurement tube, the volume V of the measurement tube, the Young's modulus C of the measurement tube, and the density ρ of the ice-water mixture, the resonance frequency Fν is expressed as Fν = 1 / 2π (C / Mp + ML) ^1/2 = 1 / 2π
(C / Mp + ρV) ^1/2 .

Accordingly, the volume of ice and snow in the measuring tube is defined as Vi.
And the volume ratio of ice and snow can be expressed by Pi = Vi / V (%),
Assuming that the volume is Vw, the volume ratio in the measuring tube is Pw = Vw / V
(%), The liquid to be measured, in this case, ice, snow and water
The density of the coalescing in the measuring tube is: ρ = Pi × ρi + Pwρw = Vi / V × ρi + Vw / V
× ρw, and the ratio of ice and snow in the measuring tube is Vi / V =
(Ρ−ρw) / (ρi−ρw)
You. Here, ρw = 1, ρi = 0.917, the latent heat of ice and snow
L = 79.6 Kcal / Kg, sensible heat of water S = 1 Kcal
Under the condition of / Kg ℃, ice and snow melt and become water at 0 ℃
The mass flow rate is QM based on the measured ρ
When calculating the integrated value QL of the amount of heat that snow has,The amount of heat
Is the integrated sum of the instantaneous values (ΔQL) t1 to tn. here
In t1 to tn, the flow velocity is v and the length of the measuring tube is z.
Z / v: t1 to tn. And instant mass
The flow rate ΔQM is “A ・ ρ ”=“ ΔV ・ ρ ”
Therefore, the integrated mass QM becomes “(ΔVt1... ΔVtn) ・
ρ ”. Then, (ΔVt1 +... ΔVtn) = V (total
(Measuring tube volume), the integrated mass QM is “V ・ ρ ”
You. And integrated from the value of ρ measured by the mass density meter
With the mass flow rate as QM, the integrated value QL of the amount of heat
When asked QL = (QM / ρ) × Pi × L × ρi = (V ・ ρ / ρ) ・ v × Pi × L × ρi  = (V) Pi × L × v × ρi. That is, QL = (V) Pi ・ L ・ v ・ The equation for ρi holds. this
QL = VPi × L · v ・ ρi
If the calculation is performed by the arithmetic circuit, it can be represented as a display value.

The above calculation is only for the latent heat of ice and snow, but it is used for cooling even at a temperature of 0 ° C. or more. That is, in the ice-snow water mixture, the temperature of the cooling water is maintained at 0 ° C. until only the ice and snow are completely melted, and a temperature rise of 0 ° C. or more can be used as a sensible heat for the cooling load. Assuming that the rising temperature used for cooling is t ° C., the sensible heat S of the water is sensible heat quantity QS = t × QM from S = txV. Therefore, when the total cooling heat quantity is obtained, Q = latent heat quantity QL + sensible heat quantity QS By performing the calculation, the value of the total heat quantity Q of the cooling medium liquid composed of the ice snow water mixture can be displayed.

[0008]

Therefore, according to the present invention, an ice snow water mixture is used as a cooling medium fed from a cold heat source to a cooling load via a feed pipe, the total amount of latent heat held by the ice and snow, and the discharge from the cooling load. By calculating and integrating the measured value of the total amount of sensible heat of water with the mass flow rate measuring means and the temperature measuring means, the true value of the supplied cooling heat can be displayed on the integrating and displaying means.

Hereinafter, preferred embodiments of the present invention will be illustratively described in detail with reference to the drawings. However, the dimensions, materials, shapes, and relative arrangements of the components, means, and the like described in this embodiment are not intended to limit the scope of the present invention to them, unless otherwise specified. It is only an example.

FIG. 1 is a schematic explanatory view of a mass flow rate measuring means, wherein 1 is a liquid feed pipe for pressure-feeding an ice-snow water mixture from a cooling heat supply source side to a cooling load side, and 3 is the above liquid feed pipe. For example, a measuring pipe of the Coriolis mass flow meter 2 connected to measure the cooling heat supply amount of the mixed liquid of ice and snow water.
Here, there are various shapes such as a U-shaped tube other than the straight tube in the present embodiment, but any measuring tube having excellent noise resistance and high sensitivity detection characteristics can be used. Can be.

Next, 4 is an oscillating means for exciting the measuring pipe 3 including free flowing water of the ice / water mixture by free vibration, and 5 is an exciting means for detecting an exciting frequency or a phase angle by the oscillating means. It is a detecting means. Reference numeral 6 denotes the amount of ice and snow and the amount of ice and snow of the ice and water mixture, which is supplied from the excitation heat source side by the liquid supply pipe 1 and passes through the measuring pipe 3 of the mass flow rate measuring means 2 to the cooling load. Integrated display means for calculating the total of the water content, the total amount of latent heat of ice and snow, and the total sensible heat of the cooling water discharged from the cooling load, and displaying the integrated value. This is a cooling water sensible heat measurement sensor for detecting the temperature of liquid discharged as cooling water on the load side.

FIG. 2 is a cold heat supply system diagram in which the cold heat supply amount measuring device of the present invention is implemented, and a plurality of liquid feed pipes 11, 12, 13, 14 and the like are connected to a cooling load 8 from a cold heat source 9.
1, 82, 83, and 84 are connected to supply cold energy. Further, 21, 22, 23, and 24 are provided with a plurality of the liquid feed pipes 11,
The mass flow measuring means disposed between 12, 13, and 14 respectively measures the measuring pipes 31, 32, 33 in the middle of the liquid feeding pipe.
The mass flow rates of the ice and snow water passing through the liquid supply pipes 11, 12, 13, and 14 are respectively connected to the oscillation units 41 and 4,
From each of 2, 43, 44, the measuring tubes 31, 32, 33
Are excited by the free oscillation frequency, and the oscillation frequency or phase difference is detected by the excitation detection means 51, 52, 5
Since the amount of ice and snow can be obtained from the mass of the flowing liquid in the measuring tube at 3, 54, the total amount of latent heat of the ice-water mixture is calculated, and the integrated result is determined in the same manner as reference numeral 6 in FIG. The integrated display means shown in the figure is displayed accurately.

Therefore, when the ice-snow water mixture is used as described above, the temperature as the cooling water is kept at 0 ° C. until the melting of only the ice and snow is completed.
Since the above temperature rise can be used as sensible heat for cooling on the cooling loads 81, 82, 83, 84 side, by detecting the temperature of the discharged water on the cooling load side, this temperature rise value and the amount of water Is calculated by the integration display means (not shown), the true total heat quantity is finally integrated, and the value can be expressed as a display value.

[0014]

As described above, according to the apparatus for measuring the amount of cold heat supplied according to the present invention, the snow and ice water itself passing through the inside of the pipe by the excitation from the oscillating means, including the ice and snow water, is applied to the measurement pipe through which the ice and snow water mixture flows. In addition, since uniform mass flow is promoted and uniform flow in the pipe is promoted, only accurate mass flow measurement can be achieved, or as described above, ice / snow water mixture flowing from the cold heat source through the liquid feed pipe to the cooling load side The amount of ice and snow extracted from the body is extracted, and the true value of the total amount of supplied cold heat including the amount of discharged water that contributes as sensible heat to the cooling of 0 ° C or more on the cooling load side is accurately calculated. Is displayed, which greatly contributes to the rational planning and installation of the cold heat supply system with respect to the cooling load installed on the ground, on a ship, or on a car, for example.

[Brief description of the drawings]

FIG. 1 is a schematic diagram for explaining a cold heat supply amount measuring device according to the present invention.

FIG. 2 is a cold heat supply system diagram using the mass flow rate measuring means of FIG.

[Explanation of symbols]

1, 11, 12, 13, 14 Liquid feed pipe 2, 21, 22, 23, 24 Mass flow rate measurement means 3, 31, 32, 33, 34 Measurement pipe 4, 41, 42, 43, 44 Oscillation means 5, 51 , 52, 53, 54 Excitation detecting means 6 Integrating display means 7 Cooling water sensible heat measurement sensor 81, 82, 83, 84 Cooling load 9 Cold heat supply source

Claims (1)

(57) [Claims] 1. Cold heat pumped to a cooling load by a liquid feed pipe
In a device that integrates and measures the amount of cold energy of the medium liquid
The liquid in which an ice snow water mixture is pumped as the cooling medium liquid
Fluid flow pathTo the Coriolis mass using the Coriolis force
Provision of a flowmeter measurement tube and temperature measurement means, The above-mentioned pumped ice-snow water mixture is subjected to the above-mentioned Coriolis mass flow rate.
Oscillation external to the measuring tube while flowing through the measuring tube
By applying electric vibration from the means, the ice-water mixture in the measuring tube
Detect the change in the resonance frequency or its phase including
Measuring the amount of ice and snow in the ice and water mixture, The amount of latent heat of the cooling medium liquid based on the amount of ice and snow,
Holding the water content of the ice snow water mixture by the temperature measuring means
And the amount of sensible heat  These allow the ice-water mixture to be fed from the cold source.
Supply coolingThe amountCooling heat supply meter characterized by measuring
Measuring device.