JP2001296073A - Heat source evaluation method and characteristics display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately and easily grasp the amount of heat exchange on the side of a heat source in a heat source test. SOLUTION: A heat source test where a heating medium W is passed through a heat source heat exchanger 2 is executed under a plurality of conditions where inlet heating medium temperature t1 of the heat source heat exchanger 2 is changed, and characteristics M1 to M3 of heating medium temperature-heat exchange amount on the heat source side possessed by the heat source heat exchanger 2 are judged. The decided characteristics M1 to M3 of the heating medium temperature-heat exchange amount on the heating medium side and characteristics K of heating medium temperature-heat exchange amount on a load side possessed by a load heat exchanger are collated to evaluate equilibrium state points P1 to P3 which provide a relationship in which a heat exchange amount q on the heat source side and a heat exchange amount Q' on the load side on the heating medium temperature-heat exchange amount on the heat source side and the load side satisfy q=Q'×(g/G) [g: a heat medium flow rate per one heat source heat exchanger, G: a heating medium flow rate of a load heat exchanger] for the same heating medium temperature condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat equipment for circulating a heat medium between a heat source heat exchanger and a load heat exchanger to collect heat from a heat source or to radiate heat to the heat source by the heat source heat exchanger. In constructing, a heat source evaluation method for grasping in advance how much heat exchange amount (that is, the amount of heat collected from the heat source body or the amount of heat released to the heat source body) can be obtained in the heat source heat exchanger for the target heat source body, and And a property indicator used in the method.

[0002]

2. Description of the Related Art Conventionally, when constructing the above-mentioned heat equipment, it is necessary to use an appropriate test method to grasp in advance how much heat exchange can be obtained in a heat source heat exchanger for a target heat source body.
A heat source test is performed in which a heat medium at a constant temperature adjusted to a temperature is passed through a heat source heat exchanger to actually exchange heat between the heat medium and the heat source body. The obtained heat exchange amount q (= g × Δt) on the heat source side is calculated based on the medium temperature difference Δt and the heat medium flow rate g (for example, see Japanese Patent Application Laid-Open No. 8-338696).

[0003]

However, in the heat medium circulation operation between the heat source heat exchanger and the load heat exchanger, the heat medium temperature of each part has a unique heat medium temperature-heat exchange characteristic. Since it is determined by the thermal balance relationship between the heat source side and the load side, the actual heat medium circulation between the load heat exchanger and the load heat exchanger It is difficult to select an appropriate test heat medium temperature (the heat medium temperature at the inlet of the heat source heat exchanger) in accordance with the actual heat medium circulation at the load heat exchanger. With medium circulation, heat source tests with different heat medium temperature conditions will be completed,
The heat source side heat exchange amount obtained in the heat source test is greatly different from the heat source side heat exchange amount obtained by the heat medium circulation operation with the load heat exchanger, and this indicates that the heat equipment based on the heat source test (In particular, the determination of the required number of parallel heat source heat exchangers (the number of parallel connection of the heat source heat exchangers to the load heat exchanger), etc.) has been a problem.

Further, based on the load-side heat medium temperature-heat exchange amount characteristic of the load heat exchanger, a heat medium temperature condition for obtaining a required load-side heat exchange amount is determined, and the determined heat medium temperature is determined. If the heat source test is performed at the test heat medium temperature according to the conditions, the heat source side heat exchange amount obtained by the heat medium circulation operation with the load heat exchanger can be accurately grasped in the heat source test. Nevertheless, if the load-side conditions change, the load-side heat medium temperature-heat exchange amount characteristics will differ, and the heat medium temperature conditions at which the required load-side heat exchange amount will be different will result. Each time, the heat source test at the test heat medium temperature in accordance with the heat medium temperature condition must be re-executed, and this has a problem that a heavy load is imposed on equipment design.

[0005] In view of the above circumstances, a main object of the present invention is to solve the above problems effectively by employing a rational heat source evaluation method.

[0006]

Means for Solving the Problems [1] In the heat source evaluation method according to the first aspect of the invention, a heat source test in which a heat medium passes through a heat source heat exchanger to exchange heat with a heat source body is performed by the heat source heat exchanger. It is carried out under a plurality of conditions in which the inlet heat medium temperature is changed, and based on the heat medium temperature measurement data and the heat medium flow rate obtained in this heat source test, the heat source side heat medium temperature of the heat source heat exchanger has The heat exchange characteristic is determined, and the determined heat medium temperature on the heat source side
The heat exchange characteristic and the heat medium temperature on the load side of the load heat exchanger that the load heat exchanger that plans to circulate the heat medium between the heat source heat exchanger and the heat exchange characteristic are compared. Medium temperature on the side and the load side-for the same heat medium temperature condition in which the heat exchange amount on the heat source side and the heat exchange amount on the load side are the same in terms of the heat exchange amount characteristics, q = Q 'x (g / G) (A) However, q: Heat source side heat exchange amount (per heat source heat exchanger) Q ': Load side heat exchange amount g: Heat medium flow rate of heat source heat exchanger (per heat source heat exchanger) G: Heat medium flow rate of load heat exchanger An equilibrium state point satisfying the above equation (a) is determined.

In other words, according to this method, the equilibrium state point obtained by the above-mentioned comparison is determined by the thermal equilibrium state (that is, each of them is unique) in the heat medium circulation operation between the heat source heat exchanger and the load heat exchanger. (Operating state determined by the thermal balance relationship between the heat source side and the load side having the heat medium temperature-heat exchange amount characteristic).

Therefore, from the state value of the above-mentioned equilibrium state point (in other words, the coordinates of the point) obtained by this collation, it is obtained by the heat medium circulation operation between the heat source heat exchanger and the load heat exchanger. The amount of heat exchange on the heat source side and the temperature conditions of the heat medium appearing in the heat medium circulation operation are accurately determined at the stage where the actual heat medium circulation between the heat source heat exchanger and the load heat exchanger has not yet been performed. It can be grasped, and thereby, the thermal equipment to be constructed can be designed more appropriately than before.

Further, a heat medium temperature-heat exchange characteristic on the heat source side determined on the basis of heat source tests under a plurality of conditions in which the inlet heat medium temperature of the heat source heat exchanger is changed, and the load of the planned load heat exchanger The above equilibrium state point is obtained by comparing with the heat medium temperature-heat exchange characteristics on the load side, so even if the load-side conditions change the heat medium temperature-heat exchange characteristics on the load side, it is determined once. Heat source temperature on the heat source side-Heat exchange amount characteristics can be used as it is, and the heat medium temperature on the heat source side-Heat exchange temperature on the load side that differs due to heat exchange amount characteristics and changes in conditions- The above equilibrium state point for the new load-side characteristic can be easily obtained only by checking the heat exchange amount characteristic.

That is, as described above, each time the load-side condition is changed to change the load-side heat medium temperature-heat exchange amount characteristic, a test heat medium temperature according to the change is selected. Thus, the burden on equipment design can be greatly reduced as compared to re-executing the heat source test.

In the above equation (a), the load side heat exchange amount Q 'is multiplied by the g / G value to determine the heat medium flow rate g per heat source heat exchanger and the heat medium flow rate of the load heat exchanger. This is a process for obtaining an equilibrium state point with the difference from G being corrected, in other words, the ratio of the load side heat exchange amount Q ′ to the heat source side heat exchange amount q at the equilibrium state point obtained by the above method. Value Q '/
q is the required number of heat source heat exchangers in parallel with respect to the load side heat exchange amount Q ′.

[2] In the heat source evaluation method according to the second aspect of the present invention, in carrying out the first aspect of the invention, a plurality of types of the heat source tests are performed with different heat medium flow rates of the heat source heat exchanger. Thus, for each case where the heat medium flow rate of the heat source heat exchanger is different, the heat medium temperature-heat exchange amount characteristics of the heat source side are determined, and the plurality of determined heat source side heat medium temperatures-heat exchange amount characteristics are determined. By performing the comparison for each, the equilibrium state point is obtained for each of the cases where the heat medium flow rate of the heat source heat exchanger is different, and the load side heat exchange amount and the necessary load side at each of these plurality of equilibrium state points are determined. By comparison with the heat exchange amount, the appropriate heat medium flow rate of the heat source heat exchanger and the necessary parallel number are determined.

That is, if the flow rate of the heat medium of the heat source heat exchanger (the flow rate of the heat medium per unit) is different, the heat medium temperature-heat exchange characteristic on the heat source side is different, and the heat source heat exchanger and the load are different. The thermal equilibrium state in the heat medium circulation operation with the heat exchanger is also different.

[0014] On the other hand, a plurality of heat source tests in which the heat medium flow rates of the heat source heat exchangers are different from each other as described above show that the heat source side heat medium temperature for each of the heat source heat exchangers having different heat medium flow rates is different. -Heat exchange amount characteristics are determined, and by performing the above-mentioned comparison on each of the plurality of determined heat source-side heat medium temperatures-heat exchange characteristics, for each case where the heat medium flow rate of the heat source heat exchanger is different. If the equilibrium state point is obtained, the load-side heat exchange amount obtained by circulating the heat medium between the heat source heat exchanger and the load heat exchanger is different for each case where the heat medium flow rate of the heat source heat exchanger is different. It can be accurately and easily grasped from the state value of the equilibrium state point.

Therefore, comparing the load-side heat exchange amount at each of the plurality of equilibrium state points with the required load-side heat exchange amount required by the heat equipment to be constructed, the necessary load-side heat exchange amount is calculated. It is possible to easily determine the appropriate heat medium flow rate and the necessary number of parallel heat source heat exchangers to obtain.

[3] In the heat source evaluation method according to the third aspect of the present invention, in carrying out the invention according to the first or second aspect, as the comparison, the temperature of the outlet heat medium or the temperature of the inlet heat medium of the heat source heat exchanger is determined. A heat source side characteristic representing a heat medium temperature-heat exchange amount characteristic on the heat source side on a coordinate system in which the average temperature of the inlet and outlet heat medium temperatures is one coordinate variable, and the heat exchange amount is the other coordinate variable. A straight line is drawn with the heat source side heat exchange amount corrected by the ratio of the heat medium flow rate of the load heat exchanger to the heat medium flow rate of the heat source heat exchanger, and the heat medium temperature on the load side minus the heat exchange. A load-side characteristic line representing a quantity characteristic is drawn, and the above-mentioned equilibrium state point is obtained as an intersection of these characteristic lines.

That is, in the above coordinate system (that is, a coordinate system in which the heat medium temperature at an appropriate position representatively representing the heat medium temperature condition is taken on one coordinate axis and the heat exchange amount is taken on the other coordinate axis), Drawing the heat source side characteristic line representing the heat medium temperature-heat exchange characteristic on the load side and the load side characteristic line representing the heat medium temperature-heat exchange characteristic on the load side, the intersection of these characteristic lines is the heat source heat exchanger. A point indicating a thermal equilibrium state in the heat medium circulation operation between the heat exchanger and the load heat exchanger (that is, the above-mentioned equilibrium state point).

Therefore, if the method of drawing the characteristic straight line on the coordinate system as described above is adopted, the above-mentioned equilibrium state point can be obtained very easily as the intersection of the characteristic straight lines. Of heat on the heat source side (in other words, the amount of heat exchange on the load side) obtained in the heat medium circulation operation between the heat exchanger and the load heat exchanger, and the temperature of the heat medium appearing in the heat medium circulation operation The condition can be obtained very easily from the coordinates of the intersection.

In the above method, the heat source-side characteristic line representing the heat medium temperature-heat exchange amount characteristic on the heat source side is represented by the ratio of the heat medium flow rate G of the load heat exchanger to the heat medium flow rate g of the heat source heat exchanger. The heat source side heat exchange amount q is corrected by (G / g) (q × G /
g) is drawn in a state where the difference between the heat medium flow rate g per heat source heat exchanger and the heat medium flow rate G per load heat exchanger is corrected, as in the above-described invention according to claim 1. Is a procedure for drawing a heat source side characteristic straight line and obtaining the equilibrium state point as an intersection of the heat source side characteristic straight line and the load side characteristic straight line.

[4] In the heat source evaluation method according to the fourth aspect of the present invention, the heat source test in which the heat medium passes through the heat source heat exchanger to exchange heat with the heat source body is performed by measuring the temperature of the inlet heat medium of the heat source heat exchanger. The test is performed under a plurality of changed conditions, and based on the measured data of the heat medium temperature and the heat medium flow rate obtained in the heat source test, a heat medium temperature-heat exchange amount characteristic of the heat source side of the heat source heat exchanger is determined. On the other hand, the required load-side heat exchange amount is obtained based on the load-side heat medium temperature-heat exchange amount characteristic of the load heat exchanger that is scheduled to circulate the heat medium with the heat source heat exchanger. The heat medium temperature condition is determined, and on the heat medium temperature-heat exchange amount characteristic on the determined heat source side, the heat exchange amount on the heat source side corresponding to the determined heat medium temperature condition is determined. By comparing the amount of heat exchange on the side and the required amount of heat exchange on the load side, To determine the number of columns.

That is, according to this method, the corresponding heat source side heat exchange amount obtained as described above (the heat source side corresponding to the determined heat medium temperature condition in the determined heat source side heat exchange temperature-heat exchange amount characteristic). (Heat exchange amount) indicates the heat exchange amount per heat source heat exchanger under the heat medium temperature condition under which the required load heat exchange amount is obtained in the planned load heat exchanger.

Therefore, the required heat-source-side heat exchange amount is divided by the required heat-source-side heat exchange amount required for the heat equipment to be constructed by the obtained heat-source-side heat exchange amount. In comparison, the required number of parallel heat source heat exchangers (in other words, the number of heat source heat exchangers) required to obtain the required load side heat exchange amount in the heat medium circulation between the heat source heat exchanger and the load heat exchanger
Heat source heat for producing heat medium temperature conditions equivalent to the above-mentioned judgment heat medium temperature conditions on the thermal balance relationship between the heat source side and the load side, each having a specific heat medium temperature-heat exchange amount characteristic The required number of parallel exchangers) can be determined accurately and easily, so that the design of the thermal equipment to be built can be made more appropriate and easier than before.

Further, the heat medium temperature-heat exchange amount characteristic on the heat source side determined based on the heat source test under a plurality of conditions in which the heat medium temperature at the inlet of the heat source heat exchanger is changed, and the load of the planned load heat exchanger The required number of parallel heat source heat exchangers is obtained from the heat medium temperature conditions for obtaining the required load side heat exchange amount determined based on the heat medium temperature on the side and the heat exchange amount characteristic as described above. Similar to the invention, even if the load side conditions change the heat medium temperature-heat exchange characteristic on the load side, the heat medium temperature-heat exchange characteristic on the heat source once determined should be used as it is. To obtain the required load-side heat exchange amount determined based on the heat medium temperature-heat exchange amount characteristic on the heat source side and the load-side heat medium temperature-heat exchange amount characteristic changed due to the change in conditions. And the new load-side characteristics The necessary number of parallel heat source heat exchanger with can be easily obtained.

That is, as described above, each time the load-side conditions change the heat medium temperature-heat exchange amount characteristics on the load side as described above, a test heat medium temperature according to the change is selected. Thus, the burden on equipment design can be greatly reduced as compared to re-executing the heat source test.

When the required number of parallel heat source heat exchangers determined by the above method is adopted, the flow rate of the heat medium per heat source heat exchanger per unit of heat source heat exchanger is limited due to restrictions on the balance of the heat medium flow between the heat source side and the load side. Is slightly different from the flow rate in the heat source test stage,
Alternatively, an error may occur such that the flow rate of the heat medium in the load heat exchanger is slightly different from the flow rate when the heat medium temperature condition for obtaining the required load-side heat exchange amount is determined. A general flow rate (rated flow rate) is used as the heat medium flow rate of the load heat exchanger when calculating the heat medium flow rate per heat exchanger and the heat medium temperature-heat exchange amount characteristics on the load side. In addition, if the necessary parallel number is determined by dividing the required load-side heat exchange amount by the heat source-side heat exchange amount, if the fraction processing is performed on the safe side, this error becomes negligible.

When a more rigorous design is required, a plurality of types of heat source tests in which the heat medium flow rates of the heat source heat exchangers are different are performed. The heat medium temperature-heat exchange amount characteristic is determined in advance, and based on the plurality of heat source side heat medium temperature-heat exchange amount characteristics, the flow rate of the heat medium per heat source heat exchanger is balanced as described above. Correction measures such as repeating the above method using the new heat source side heat medium temperature-heat exchange amount characteristics obtained by determining the heat source side heat medium temperature-heat exchange amount characteristics in the case of different from the above restrictions. Alternatively, when the heat medium flow rate of the load heat exchanger is different due to the restriction on the flow rate balance as described above, the correction method such as repeating the above method using the load side heat medium temperature-heat exchange amount characteristic may be performed. Good.

[5] In the heat source evaluation method according to the fifth aspect of the present invention, in carrying out the invention according to any one of the first to fourth aspects, the inlet / outlet heat of the heat source heat exchanger obtained in the heat source test is obtained. To calculate the heat exchange amount on the heat source side based on the measured value of the medium temperature and the flow rate of the heat medium, the outlet of the heat source heat exchanger is the heat medium passage time required from the inlet to the outlet of the heat source heat exchanger. The measured value of the inlet / outlet heat medium temperature at which the heat medium temperature is measured later than the inlet heat medium temperature is used.

That is, since it takes a certain amount of time for the heat medium to pass from the inlet to the outlet of the heat source heat exchanger when the heat medium passes through the heat source heat exchanger, the temperature of the inlet and outlet heat medium of the heat source heat exchanger is measured. To calculate the heat exchange amount on the heat source side based on the value and the flow rate of the heat medium, simply using the same measurement value at the time of measurement of the inlet heat medium temperature and the outlet heat medium temperature of the heat source heat exchanger, An error due to the measured value of the heat medium temperature at the inlet / outlet being a measured value for the heat medium displaced at the time of being sent to the heat source heat exchanger for the above-described time occurs in the calculation result of the heat source heat exchange amount, An error will also occur in the determination of the heat source side heat medium temperature-heat exchange amount characteristic.

On the other hand, as described above, in the calculation of the heat source side heat exchange amount based on the measured value of the heat medium flow rate at the inlet and outlet of the heat source heat exchanger and the flow rate of the heat medium, the heat source heat exchanger reaches from the inlet to the outlet. If the measured value of the inlet / outlet heat medium temperature at the time of measurement at the outlet heat medium temperature of the heat source heat exchanger is slower than the inlet heat medium temperature for the heat medium passage time required by Since the measured value of the medium temperature is the measured value of the heat medium at the same feeding time to the heat source heat exchanger, the error as described above can be avoided, and thus, the heat medium temperature-heat exchange amount characteristic on the heat source side In the invention according to the first to third aspects, the equilibrium state point is determined, and in the invention according to the fourth aspect, the required number of parallel heat source heat exchangers is more accurately determined. Can be.

When the heat source heat exchanger is an underground heat exchanger for exchanging a heat medium underground with the ground, the heat medium passage time required from the entrance to the exit of the underground heat exchanger is required. This method is particularly effective because it is particularly large compared to other types of heat source heat exchangers, and the temperature of the soil as a heat source tends to gradually change with the progress of heat exchange.

[6] In the heat source evaluation method according to the sixth aspect of the present invention, in carrying out the invention according to any one of the first to fifth aspects, an underground heat exchanger for exchanging a heat medium with the ground in the ground is provided. In the heat source test with the heat source heat exchanger, the heat medium temperature on the heat source side-measurement data of the heat medium temperature used for determination of the heat exchange amount characteristic, changing the inlet heat medium temperature of the heat source heat exchanger In order to collect under each condition, after changing the inlet heat medium temperature of the heat source heat exchanger, a standby time is provided until the heat medium temperature adopted as the measurement data is collected, and this standby time is It is a time during which measurement data in which the correlation coefficient of the linear correlation between the heat medium temperature and the heat source side heat exchange amount is equal to or greater than a set value is obtained.

That is, in a heat source test in which an underground heat exchanger for exchanging a heat medium with a ground heat is used as a heat source heat exchanger, one of the characteristics of using soil as a heat source body is that the heat medium is exchanged with a fluid such as water or air. Compared to the heat source test to be exchanged, when the temperature of the heat medium at the inlet of the heat source heat exchanger is changed as a change of the test conditions, it takes an extremely long time until the heat medium temperature and the heat source side heat exchange amount of each part are stabilized.

On the other hand, in the case of the heat source test for the underground heat exchanger, the measurement data of the heat medium temperature used to determine the heat medium temperature-heat exchange amount characteristic on the heat source side is used as the heat transfer rate at the inlet of the heat source heat exchanger. As described above, after the temperature of the inlet heat medium of the heat source heat exchanger is changed, until the heat medium temperature adopted as measurement data is collected, in the heat exchange test under each condition with the medium temperature changed. If a waiting time is provided, and this waiting time is defined as a time at which measurement data in which the correlation coefficient of the linear correlation between the heat medium temperature and the heat source heat exchange amount is equal to or greater than a set value is obtained, Regardless of whether the soil is used as the heat source, the heat medium temperature-heat exchange characteristic on the heat source side can be determined more accurately based on the measurement data, which allows the underground heat exchanger to be replaced with the heat source heat exchanger. The equilibrium point and underground heat exchange The necessary number of parallel vessels can be determined more accurately.

In carrying out the heat source evaluation method of the invention according to claim 6, the standby time is not less than the maximum continuous heat-collecting operation time (so-called practical time) predicted by the heat equipment to be constructed, and It is desirable to adopt a time during which measurement data having a correlation coefficient equal to or greater than a set value is obtained.

[7] In the characteristic indicator of the present invention according to claim 7, as the characteristic indicator used in the heat source evaluation method of the invention according to claim 3 or 4, the temperature indicator of the outlet heat medium of the heat source heat exchanger or the characteristic indicator is used. The heat medium temperature-heat exchange amount characteristic on the heat source side on a coordinate system in which the inlet heat medium temperature or the average temperature of the inlet and outlet heat medium temperatures is one coordinate variable, and the heat exchange amount is the other coordinate variable. In the state where the heat source side heat exchange amount is corrected by the ratio of the heat medium flow rate of the load heat exchanger to the heat medium flow rate of the heat source heat exchanger, or the state before the correction. Make it what you drew.

That is, a characteristic display device in which the above heat source side characteristic straight line is drawn in a state where the heat source side heat exchange amount is corrected by the ratio of the heat medium flow amount of the load heat exchanger to the heat medium flow amount of the heat source heat exchanger. By simply adding a load-side characteristic line representing the load-side heat medium temperature-heat exchange amount characteristic on the coordinate system, the invention according to claim 3 makes it extremely easy to use the equilibrium state point as an intersection of the characteristic lines. You can ask.

In the characteristic display device in which the heat source side characteristic straight line is drawn in the state before the correction, the load side characteristic line representing the load side heat medium temperature-heat exchange amount characteristic is drawn on the coordinate system. By performing the release procedure of the invention according to claim 4 on the display, the required number of parallel heat source heat exchangers can be obtained very easily.

The above-mentioned characteristic display device is either a drawing in which a heat source-side characteristic straight line is drawn on a coordinate system in the form of a sheet such as paper, or a display of the drawing as an image on a screen. You may.

[0039]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] FIG.
The heat medium W is circulated through the underground heat exchanger 2 buried in
(For example, a heat facility that circulates the heat medium W between the underground heat exchanger 2 and the heat exchanger for snow melting and heats snow from the underground 1). A test facility for grasping in advance how much heat exchange amount q (heat extraction amount from underground 1) can be obtained in the underground heat exchanger 2 for the heat collection site 1 will be described.

In this test facility, reference numeral 3 denotes a compression type heat pump device as a simulated load device, and a heat medium W through a heat medium circulation path 4 between the evaporator 3a and the underground heat exchanger 2 of the heat pump device 3. (Water or brine).

The heat pump device 3 is provided with two condensers 3b and 3c for heat recovery and heat radiation, and a part W 'of the circulating heat medium W returning from the underground heat exchanger 2 is bypassed. After being sent to the condenser 3b for heat recovery through the passage 5, it is returned to the heat medium circulation passage 4 again and sent to the evaporator 3a together with another heat medium W.

That is, in this test facility, part of the heat absorbed from the circulating heat medium W by the evaporator 3a of the heat pump device 3 is returned to the circulating heat medium W '(W) by the condenser 3b for heat recovery. Only the other part of the heat absorption amount is radiated from the condenser 3c for radiation to the atmosphere A. In this configuration, the three-way valve 6
By adjusting the flow rate of the heat medium to the bypass 5, the amount of heat returned to the heat medium W 'in the heat recovery condenser 3b is adjusted (in other words, the two condensers 3b, 3c arranged in series are connected to each other). The heat radiation ratio is adjusted), and the underground heat exchanger 2 is
The temperature t1 of the heat medium W sent to is adjusted.

F is a heat medium circulation pump, 7 is an underground heat exchanger 2
Flowmeters 8a and 8b for measuring the heat medium circulation flow rate g to the underground heat exchanger 2 are an inlet heat medium temperature t1 and an outlet heat medium temperature t2.
, A heat medium bypass 9 for the underground heat exchanger 2, and V a valve provided in each section.

In the test using this test equipment, a three-way valve 6 is used for a heat source test in which the heat medium W is circulated between the underground heat exchanger 2 and the heat pump device 3 to actually exchange heat with the ground.
The heat source test under a plurality of conditions in which the inlet heat medium temperature t1 is changed while the inlet heat medium temperature t1 of the underground heat exchanger 2 is changed by the adjustment of
The operation is performed for a plurality of types in which the flow rate g of the heat medium of the underground heat exchanger 2 is changed by adjusting the valve V.

The temperature data t1, t measured by the temperature detectors 8a, 8b in these heat source tests.
2 and the heat extraction amount q (= g × (t2−t) obtained under each condition based on the heat medium flow rate g of the underground heat exchanger 2 in each heat source test.
1)), and subsequently, as a determination of the heat source side characteristics, as shown in FIG. 2, the heat at a representative location indicating the calculated heat extraction amount q and the heat medium temperature condition when each heat extraction amount q is obtained. Medium temperature t2 (in this example, the temperature of the outlet heat medium of the underground heat exchanger 2 is used)
Are obtained for each of the heat medium flow rates g1 to g3.

In other words, these regression lines m1 to m2 represent the heat medium temperature-heat exchange characteristic on the heat source side of the underground heat exchanger 2 for each heat medium flow rate g1 to g3 on the t2-q coordinate system. This is a heat source side characteristic straight line.

In the above heat source test, when the inlet heat medium temperature t1 of the underground heat exchanger 2 is changed by adjusting the three-way valve 6 as a test condition change, as shown in FIG. It takes a considerable amount of time for t2 and the amount of heat q to stabilize.
After the change operation of 1, a standby time Tm is provided until the measurement data of the heat medium temperatures t1 and t2 adopted in the above-mentioned heat collection amount calculation is collected, and the standby time Tm is predicted by the thermal equipment to be constructed. Maximum continuous heating operation time Ta (for example, 4
(Time of about time) or more, and a time during which measurement data in which the correlation coefficient of the linear correlation is equal to or more than a set value (for example, a value such as 0.7 or 0.8) is obtained.

In contrast to the fact that the underground heat exchanger 2 is long and the heat medium W requires a considerable time Te from the entrance to the exit of the underground heat exchanger 2, the temperature detectors 8 a and 8 b In order to calculate the above heat extraction amount q based on the measured values of the heat medium temperatures t1 and t2 at the inlet and outlet of the underground heat exchanger 2 and the heat medium flow rate g, it is necessary to calculate from the inlet to the outlet of the underground heat exchanger 2. For the required heat medium passage time Te, the measured values of the inlet and outlet heat medium temperatures t1 and t2 at the measurement time point of the outlet heat medium temperature t2 of the heat source heat exchanger 2 are later than the inlet heat medium temperature t1.

Next, based on the test results of the heat source test, what kind of thermal equilibrium state appears in the actual heat medium circulation operation between the underground heat exchanger 2 and the load heat exchanger In designing the thermal equipment to be constructed by grasping the above, the following methods (a1) to (a4) are employed.

(A1) As shown in FIG. 4, the regression lines m1 to m3 as the heat source side characteristic lines are used to determine the load heat exchanger with respect to the heat medium flow rate g (the heat medium flow rate per unit) of the underground heat exchanger 2. T2 for each heat medium flow rate g1 to g3 in the form of a corrected regression line M1 to M3 in which the heat collection amount q is corrected (q × G / g = Q) by the ratio value (G / g) of the heat medium flow rate G -Draw on the Q coordinate system.

(A2) On the other hand, the load-side heat medium temperature-heat exchange amount characteristic of the load heat exchanger to be connected (that is, the load-side heat exchange amount Q '(radiation amount) and the heat medium temperature t2 (load heat The linear correlation existing between the heat medium and the inlet of the exchanger) is obtained by calculation on a model, a test for actually passing the heat medium W, and the like.

(A3) As a comparison between the heat source side characteristic and the load side characteristic, the load side characteristic line K representing the heat medium temperature-heat exchange amount characteristic on the load side is calculated by using t2- Draw on the Q coordinate system, and find intersections P1 to P3 of the corrected regression lines M1 to M3 with respect to the load-side characteristic line K.

In other words, these intersections P1 to P3 indicate that the heat medium flow rate g of the underground heat exchanger 2 is g1 to g3, and that the heat medium flow-temperature characteristics on the heat source side and the load side are different from each other. For a heat medium temperature condition in which the amount of heat q per unit of the intermediate heat exchanger 2 (heat source side heat exchange amount) and the amount of heat radiation Q '(load side heat exchange amount) of the load heat exchanger are the same, q = Q ′ × (g / G) (a) It is an equilibrium state point that satisfies the above equation (a), and the heat medium flow rate q of the underground heat exchanger 2 is g1 to g3. Thermal equilibrium state in the heat medium circulation operation between the underground heat exchanger 2 and the load heat exchanger (ie, the heat source side and the load side each having a specific heat medium temperature-heat exchange amount characteristic). Operating condition determined from the thermal balance relationship of the two).

(A4) The intersection points P1 to P3
By comparing the heat release amount Q '(in other words, the heat extraction amount Q) at each of the (equilibrium state points) and the required heat release amount Qs (necessary load-side heat exchange amount) of the planned thermal equipment, Of the heat medium flow rate g per unit of the underground heat exchanger 2 and the required parallel number n are determined. That is, in the example shown in FIG.
Since the heat radiation amount Q ′ in the above approximately matches the required heat radiation amount Qs, g ≒ g2 and n ≒ G / g2 are adopted as the heat medium flow rate g per unit of the underground heat exchanger 2 and the required parallel number n.

The corrected regression line M is plotted on the t2-Q coordinate system.
In order to obtain the intersection points P1 to P3 (equilibrium state points) using a chart depicting the load characteristic curve K and the load side characteristic straight line K, the chart is described on a sheet such as paper or a monitor screen of a computer. For example, any of the images displayed as images may be used.

[Second Embodiment] In the first embodiment, the thermal equilibrium state that appears in the heat medium circulating operation between the underground heat exchanger 2 and the load heat exchanger is referred to as the heat source side heat exchange. Heat source-side characteristic straight lines M1 to M3 corrected for the quantity q (corrected regression line)
From the intersections P1 to P3 of the load characteristic line K and
Although the example in which the facility design is performed has been described, in the second embodiment,
The following design methods (b1) to (b4) are employed.

(B1) Inlet heat medium temperature t of underground heat exchanger 2
1 and the same heat source test as described above was performed in the underground heat exchanger 2
The test was carried out in a state where a predetermined flow rate g2 '(flow rate at a rated value) was adopted as the heat medium flow rate g of the underground heat exchanger based on the test results. 2 and the heat medium temperature t at the outlet of the underground heat exchanger 2
A regression line m2 '(that is, a heat source side characteristic line) of a linear correlation existing between the two is drawn on the t2-q coordinate system as shown in FIG.

(B2) On the other hand, the load-side heat medium temperature-heat exchange amount characteristic of the load heat exchanger to be connected (load side heat exchange amount Q '(heat release amount) and heat medium temperature t2 (load heat exchanger) Of the heat medium at the load side is calculated by calculation on the model or by a test for actually passing the heat medium W, and the heat medium temperature-heat exchange characteristic on the load side is expressed. A load-side characteristic line K is drawn on the t2-q coordinate system together with the regression line m2 '.

(B3) In this t2-q coordinate system, the heat transfer medium temperature ts at which the required heat radiation amount Qs (the required load-side heat exchange amount) is obtained on the load-side characteristic line K is obtained, and on the regression line m2 ' Then, a heat extraction amount qs (heat source side heat exchange amount) corresponding to the obtained heat medium temperature ta is obtained.

That is, the corresponding heat extraction amount qs indicates the heat extraction amount per unit of the underground heat exchanger 2 under the heat medium temperature condition under which the required heat release amount Qs is obtained in the planned load heat exchanger. It is.

(B4) Then, the obtained corresponding heat quantity q
The value Qs / qs (specifically, a value obtained by dividing the required heat release amount Qs by s and rounded up to an integer) is defined as the required parallel number n of the underground heat exchangers 2 in the heat facility to be constructed. .

When the required parallel number n determined as described above is adopted, the heat medium flow rate g per underground heat exchanger 2 is reduced due to the restriction on the heat medium flow balance between the heat source side and the load side. It may be slightly different from the flow rate g2 'in the heat source test stage, or the heat medium flow rate G of the load heat exchanger may be different from the load side characteristic straight line K.
May be slightly different from the flow rate when the determination is made. On the other hand, when a strict design is required, as in the first embodiment, the underground heat exchanger is used. 2, a heat source side heat medium temperature-heat exchange amount characteristic when the heat medium flow rate g of the underground heat exchanger 2 is different is determined in advance by a plurality of types of heat source tests with different heat medium flow rates g, On the basis of the plurality of heat source side heat medium temperature-heat exchange characteristics, the heat source side heat medium temperature when the heat medium flow rate g per unit of the underground heat exchanger 2 is different due to the restriction on the flow rate balance as described above. -The heat exchange amount characteristic is obtained, and the correction method of repeating the above method using the obtained new heat source side heat medium temperature-the heat exchange amount characteristic, or the heat medium flow rate G of the load heat exchanger is Load side heat when the flow rate is different due to the flow balance Temperature - perform corrective actions, such as repeating the above-described method using a heat exchange quantity characteristic.

[Other Embodiments] In each of the above-described embodiments, an example has been described in which the underground heat exchanger 2 that exchanges heat with the heat medium W to collect heat from the underground 1 is used as a heat source heat exchanger. The present invention can be applied to a case where the underground heat exchanger 2 that causes the heat medium W to exchange heat with the ground and radiates heat to the underground 1 is used as a heat source heat exchanger. In addition, river water, lake water, seawater, groundwater, The present invention can also be applied to a case where various types of heat exchangers for heat collection or heat radiation using a liquid such as sewage or a gas such as atmospheric air as a heat source body are used as heat source heat exchangers.

When the underground heat exchanger is a heat source heat exchanger, the underground heat exchanger may be of any type, such as a double pipe type or a U-tube type. Good.

The load heat exchanger to be connected to the heat source heat exchanger is not limited to the snow melting heat exchanger laid in the snow melting target area, but may be used for air conditioning heat exchangers or heating or cooling of articles. The heat exchanger used may be any type of heat exchanger, such as a heat exchanger used, or a heat source side heat exchanger of a heat pump device that supplies hot or cold heat to a demand destination.

In the first embodiment, the intersections P1 to P3 of one load-side characteristic line K with respect to the heat-source-side characteristic lines M1 to M3 (correction regression line) are determined as equilibrium points. When there are a plurality of heat exchanger candidates, each load-side characteristic straight line K
And the intersection of the heat source characteristic lines M1 to M3 may be determined, and the number of heat source side characteristic lines M1 to M3 is not limited to three.

On a coordinate system in which the heat medium temperature at an appropriate position indicating the heat medium temperature condition is taken on one coordinate axis and the heat exchange amounts of the heat source heat exchanger and the load heat exchanger are taken on the other coordinate axis, To draw the heat source side characteristic lines M1 to M3, m2 'and the load characteristic line K, in each of the above-described embodiments, the heat medium temperature at the outlet of the heat source heat exchanger is defined as the heat medium temperature at an appropriate location indicating the heat medium temperature condition. Although an example using (ie, the heat medium temperature at the inlet of the load heat exchanger) is shown, the heat medium temperature at an appropriate point indicating the heat medium temperature condition is determined by the heat medium temperature t1 at the inlet of the heat source heat exchanger (load heat exchange temperature). (The temperature of the heat medium at the outlet of the heat exchanger), the average temperature of the heat medium temperatures t1 and t2 at the inlet and the outlet of the heat source heat exchanger, or the temperature of the heat medium at another point in the heat medium circulation system.

In the above-described first embodiment, the heat source side characteristic straight line M1 for finding intersections P1 to P3 with the load characteristic straight line K is described.
To M3 is a correction straight line shape in which the heat source side heat exchange amount q is corrected by the ratio G / g of the heat medium flow rate G of the load heat exchanger to the heat medium flow rate g (flow rate per unit) of the heat source heat exchanger. However, the load-side characteristic straight line K may be drawn in the form of a correction straight line.

The heat source-side characteristic straight lines M1 to M3, m2 'and the load-side characteristic straight line K are displayed on paper or the like or displayed on a screen, and the equilibrium points P1 to P3 are displayed on the display.
Claim 1 instead of finding the required number of parallel heat exchangers and heat source heat exchangers
Alternatively, the invention according to the second aspect or the invention according to the fourth aspect may be carried out on the arithmetic processing by the arithmetic means to obtain the equilibrium state points P1 to P3 and the necessary number of parallel heat source heat exchangers.

[Brief description of the drawings]

FIG. 1 is a diagram showing a facility configuration of a test facility.

FIG. 2 is a graph showing a regression line of a linear correlation on a heat source side.

FIG. 3 is a graph showing a change with time of a heat medium temperature and a heat collection amount in a heat source test.

FIG. 4 is a graph showing a correction regression line on the heat source side and a characteristic line on the load side.

FIG. 5 is a graph showing a regression line on the heat source side and a characteristic line on the load side.

[Explanation of symbols]

 1 Heat source body 2 Heat source heat exchanger, underground heat exchanger g Heat medium flow rate of heat source heat exchanger G Heat medium flow rate of load heat exchanger q, Q Heat source side heat exchange quantity Q 'Load side heat exchange quantity Qs Required load Side heat exchange amount K Load side characteristic, load side characteristic straight line M1 to M3 Heat source side characteristic, heat source side characteristic straight line n Required number of parallel heat source heat exchangers P1 to P3 Equilibrium state point, intersection point t1 Temperature t2 Heat medium temperature at exit of heat source heat exchanger Te Heat medium passage time Tm Standby time W Heat medium

Claims (7)

[Claims] 1. A heat source test in which a heat medium is passed through a heat source heat exchanger to exchange heat with a heat source body is performed under a plurality of conditions in which the temperature of an inlet heat medium of the heat source heat exchanger is changed. Based on the measurement data of the heat medium temperature and the heat medium flow rate obtained in the above, the heat medium temperature-heat exchange amount characteristic of the heat source side of the heat source heat exchanger is determined. The exchange amount characteristic is compared with a heat medium temperature-heat exchange amount characteristic on a load side of a load heat exchanger that is supposed to circulate a heat medium between the heat source heat exchanger and the heat source side. And the heat medium temperature on the load side
Under the heat medium temperature condition where the amount of heat exchange on the heat source side and the amount of heat exchange on the load side are the same on the heat exchange amount characteristic, q = Q ′ × (g / G) (a) where q : Heat source side heat exchange amount (per heat source heat exchanger) Q ': load side heat exchange amount g: heat medium flow rate of heat source heat exchanger (per heat source heat exchanger) G: heat of load heat exchanger Medium flow rate A heat source evaluation method for finding an equilibrium state point satisfying the above equation (a). 2. Performing a plurality of types of heat source tests in which the heat medium flow rates of the heat source heat exchangers are different from each other to obtain heat on the heat source side when the heat medium flow rates of the heat source heat exchangers are different. By determining the medium temperature-heat exchange amount characteristic, and performing the above-mentioned comparison on each of the plurality of determined heat source side heat medium temperature-heat exchange amount characteristics, each of the cases where the heat medium flow rate of the heat source heat exchanger is different. The above-mentioned equilibrium state points are obtained, and by comparing the load-side heat exchange amount and the required load-side heat exchange amount at each of the plurality of equilibrium state points, the appropriate heat medium flow rate and the necessary parallel number of the heat source heat exchanger are determined. Claim 1 to be determined
The described heat source evaluation method. 3. The method according to claim 1, wherein the temperature of the heat medium at the outlet of the heat source heat exchanger, the temperature of the heat medium at the inlet, or the average temperature of the heat medium at the inlet and the outlet of the heat source heat exchanger is defined as one coordinate variable, and the heat exchange amount is defined as the other coordinate. On a coordinate system as a variable, the heat source side characteristic line representing the heat medium temperature-heat exchange amount characteristic on the heat source side is a ratio of the heat medium flow rate of the load heat exchanger to the heat medium flow rate of the heat source heat exchanger. Claims are drawn with the amount of heat exchange on the heat source side corrected, and a load-side characteristic line representing the heat medium temperature-heat exchange amount characteristic on the load side is drawn, and the equilibrium point is obtained as an intersection of these characteristic lines. 3. The heat source evaluation method according to 1 or 2. 4. A heat source test in which a heat medium is passed through a heat source heat exchanger to exchange heat with a heat source body is performed under a plurality of conditions in which the temperature of an inlet heat medium of the heat source heat exchanger is changed. Based on the measurement data of the heat medium temperature and the heat medium flow rate obtained in the above, the heat medium temperature on the heat source side of the heat source heat exchanger-heat exchange amount characteristic is determined, while between the heat source heat exchanger Based on the load-side heat medium temperature-heat exchange amount characteristic of the load heat exchanger that is scheduled to circulate the heat medium, determine the heat medium temperature condition at which the required load-side heat exchange amount is obtained, and determine the determined heat source side. On the heat medium temperature-heat exchange amount characteristic of the above, the heat exchange amount on the heat source side corresponding to the determined heat medium temperature condition is obtained, and the obtained heat exchange amount on the heat source side and the necessary heat exchange on the load side are obtained. A heat source evaluation method for determining the required number of parallel heat source heat exchangers by comparing the amount with the heat source heat exchanger. 5. A heat source-side heat exchanger for calculating a heat exchange amount on a heat source side based on a measured value of an inlet / outlet heat medium temperature of the heat source heat exchanger obtained in the heat source test and a heat medium flow rate. The measured value of the inlet / outlet heat medium temperature at the time of measurement where the outlet heat medium temperature of the heat source heat exchanger is later than the inlet heat medium temperature for the heat medium passage time required from the inlet to the outlet is used. 5. The heat source evaluation method according to any one of 4. 6. In the heat source test, wherein the underground heat exchanger that causes the heat medium to exchange heat with the ground is used as the heat source heat exchanger, the heat used to determine the heat medium temperature-heat exchange amount characteristic on the heat source side. The measurement data of the medium temperature is taken as the measurement data after the temperature of the inlet heat medium of the heat source heat exchanger is changed, in order to collect the measurement data of the temperature of the heat source heat exchanger under various conditions in which the temperature of the heat medium of the heat source heat exchanger is changed. A waiting time is provided before the heating medium temperature is sampled, and the waiting time is used to obtain measurement data in which a correlation coefficient of a linear correlation between the heating medium temperature and the heat source side heat exchange amount is equal to or greater than a set value. The heat source evaluation method according to any one of claims 1 to 5, wherein the method is time. 7. A coordinate in which the temperature of the outlet heat medium or the temperature of the inlet heat medium or the average temperature of the inlet and outlet heat medium of the heat source heat exchanger is defined as one coordinate variable, and the amount of heat exchange is defined as the other coordinate variable. In the system, the heat source side characteristic line representing the heat medium temperature-heat exchange amount characteristic on the heat source side is calculated by the ratio of the heat medium flow rate of the load heat exchanger to the heat medium flow rate of the heat source heat exchanger. The characteristic indicator used in the heat source evaluation method according to claim 3 or 4, which is drawn in a state where the heat exchange amount is corrected or before the correction.