JPH0510176Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a calorimeter for air conditioning systems that is suitable for measuring the amount of heat used mainly in residential air conditioning systems.

(Prior Art) Conventionally, air conditioning systems for condominiums, hotels, office buildings, etc., as shown in FIG.
The heat is then supplied to the terminal heat pump 4 in each room for heating and cooling. Further, a boiler 5 for supplying hot water is connected to the brine tank 2, and when the amount of heat of the brine is insufficient, the boiler 5 supplementally heats the brine. A hot water tank 6 is connected to the boiler 5 so that desired hot water can be supplied. Further, the temperature of the conditioned air supplied from each terminal heat pump 4 is detected by a temperature sensor 7, and the controller 8 controls the temperature based on this detection signal.
is controlling the terminal heat pump 4.

On the other hand, to measure the calorific value of a fluid, it is necessary to detect the temperature difference between the input and output of the fluid and the transferred flow rate, and usually a flow meter and multiple temperature sensors must be installed at the measurement tube. .

(Problem to be solved by the invention) However, when applying a conventional calorimeter to the above-mentioned air conditioning system, a flow meter is installed in each brine pipe 3, and a flow meter is installed at the brine inlet and outlet for each terminal heat pump. Since it is necessary to attach a temperature sensor to the sensor, the assembly work is difficult and causes an increase in the number of parts and costs. In addition, the amount of heat actually exchanged from the brine is
Since the amount of heat varies depending on the strength of the brine, it is not possible to obtain an accurate amount of heat used simply by measuring the amount of heat in the brine.

The present invention has been made in view of the above circumstances, and its purpose is to provide a calorimeter for an air conditioning system that can easily and accurately measure the amount of heat supplied to brine in an air conditioning system.

(Means for Solving the Problems) In order to achieve the above object, the calorimeter for air conditioning systems according to the present invention is designed for use in brine heat exchangers of air conditioning system equipment to which brine is fed at a constant temperature and at a constant flow rate. a temperature sensor that detects the outlet side temperature;
A current detecting means for detecting the current used by the air conditioning system equipment, the temperature detected by the temperature sensor, and the current detected by the current detecting means, calculates the amount of heat used every certain time, accumulates the amount of heat used, and calculates the amount of heat used by the current detecting means. It is composed of a control means for comparing the used heat amount data and the reference heat amount data, and a counter that counts when the cumulative used heat amount data is higher than the reference heat amount data based on the comparison signal of the control means and displays a numerical value corresponding to the used heat amount data. ing.

(Function) With the above configuration, first, the temperature of the brine transferred from the brine tank of the air conditioning system to the terminal heat pump is detected by the temperature sensor, and this detection signal is sent to the control means. Further, the current of the terminal heat pump is detected by the current detection means, and this detection signal is also sent to the control means. Here, in this control means, since the brine has a constant temperature and a constant flow rate, the amount of heat used is calculated from the temperature detected by the temperature sensor. Furthermore, the amount of heat used changes based on the thermal load, and the current detected by the current detection means also changes based on the heat load, so the amount of heat used can be indirectly determined based on this detected current. Therefore, an appropriate amount of heat to be used is determined based on the data of both the detected temperature and the detected current. The amount of heat used calculated in this manner is accumulated and further compared with reference amount of heat data. Here, when the used heat amount data is higher than the reference heat amount data, the counter counts and displays a numerical value corresponding to the used heat amount.

(Example) FIG. 1 shows a residential building air conditioning system in which the calorimeter of the present invention is incorporated, and this air conditioning system includes a center heat pump 11, a brine tank 12, a brine pipe 13, a terminal heat pump 14,
It is equipped with a boiler 15 and a hot water tank 16.

The center heat pump 11 includes a compressor motor 20, a compressor 21, a four-way valve 22, and an outdoor heat exchanger 2.
3. Blower 24, expansion valve 25, brine tank 1
During heating, the heat exchanger 23 absorbs heat, and the heat exchanger 26 radiates heat to heat the brine 19 in the brine tank 12. During cooling, the heat exchanger 26 absorbs heat and exchanges heat. The vessel 23 cools the brine 19 by dissipating heat.

The brine tank 12 receives brine 19 for heat storage therein, and a heat exchanger 26 on the center heat pump 11 side and a brine heating heat exchanger 27 on the boiler 15 side are immersed in the brine 19.
Also, the brine 19 in the tank 12 is pumped 2
8, the brine is circulated and supplied to each terminal heat pump 14 through the brine pipe 13. The brine 19 in the brine tank 12 is always maintained at a constant temperature by a predetermined controller (not shown).

The terminal heat pump 14 has almost the same structure as the center heat pump 11, and has a compressor motor 3.
0, compressor 31, four-way valve 32, heat exchanger 33, blower 34, expansion valve 35, and brine heat exchanger 36
It consists of Therefore, during heating, the heat exchanger 36 absorbs heat from the brine 19, and the heat exchanger 33 converts this heat into warm air and releases it into the room, and during cooling, the heat exchanger 33 absorbs the heat inside the room. Heat exchanger 36 then releases this heat to brine 19.

The temperature of the blown air in each room is detected by a temperature sensor 17, and a controller 18 controls the terminal heat pump 14 based on this detection signal.

Boiler 15 generates hot water with an internal burner (not shown), and this hot water is sent to hot water tank 16 and stored. In addition, the boiler 15 is connected to the heat exchanger 2
Brine 19 in brine tank 12 through 7
auxiliary heating.

FIG. 3 shows a block circuit diagram of a calorimeter used in the above air conditioning system.
Temperature sensor 40, current detector 41, amplifiers 42, 43 for amplifying each signal, A/D converter 44, microprocessor 45, memory 4 for reading and writing at any time
6, a read-only memory 47, a power-up buffer 48, and a counter 49 for cumulatively displaying the amount of heat used.

The temperature sensor 40 is attached to the outlet side of the heat exchanger 36 of the terminal heat pump 14, as shown in FIG. 1, and detects the brine temperature of the heat exchanger. Since the brine 19 before heat exchange is kept constant in the brine tank 12 as described above, the temperature difference of the brine 19 is calculated by this single point detection.

The current detector 41 is built into the controller 18 (FIG. 1) for room temperature control, and detects the load current of the terminal heat pump 14.

The microprocessor 45 calculates the amount of heat used at regular intervals from the input temperature data and current data, compares it with a reference value in the read-only memory 47, and sends a count operation signal to the counter 49.

The components of the calorimeter other than the temperature sensor 40 are all housed in the controller 18, and a conventional controller can be used by inserting the operating program of the microprocessor 45 into the main program for room temperature control.

Next, the operation of the calorimeter in this embodiment will be explained based on the flowchart of FIG.

First, when the pump 28 (Fig. 1) is activated, the brine 19 in the brine tank 12 is pumped into the brine pipe 1.
3 in the direction of the arrow, and is heat exchanged by the heat exchanger 36 of the terminal heat pump 14. At this time,
The flow rate of the brine 19 is constant because the diameter of the brine pipe 13 and the brine circulation speed by the pump 28 are fixed, and there is no need to measure it.

The temperature of the brine 19 leaving the heat exchanger 36 is detected by a temperature sensor 40, and this detection signal is amplified by an amplifier 42 (FIG. 3) and sent to an A/D converter 44.
After being digitized by the microprocessor 45
is input as temperature data (S1). On the other hand, the current detector 41 detects the current while the terminal heat pump 14 is operating, and transmits this detection signal to the amplifier 4.
After being amplified at step 3 and digitized by the A/D converter 44, the signal is inputted as current data to the microprocessor 45 (S1).

The microprocessor 45 accumulates these input data into the previous data (initially 0) at regular intervals and calculates the amount of heat corresponding to this data (S2).

Here, since the temperature inside the brine tank 12 is constant and the flow rate is also constant,
Based on the temperature data on the outlet side of the heat exchanger 36, the amount of heat used corresponding to this temperature is determined. By the way, the temperature inside this brine tank 12 is maintained at a predetermined temperature by the center heat pump 11, but the heat exchange capacity of this center heat pump 11 fluctuates somewhat due to the influence of outside air temperature, etc., and accordingly, the temperature data The equivalent amount of heat based on On the other hand, since the current values of the compressor motor 30 and the blower 34 of the terminal heat pump 14 change based on their heat loads, the amount of heat used can be indirectly determined based on this current value. Therefore, based on this current data, the amount of heat used based on the temperature data is corrected to calculate an appropriate amount of heat used.

Next, in step S3, the data is compared with the reference value, and if the data is greater than the reference value, the process proceeds to step S4, and if it is smaller, the data is stored in the memory 46, and the process proceeds to the end. The reference value is a minimum unit amount of heat that can be measured by the calorimeter, and is stored in the read-only memory 47.

In step S4, the difference between the data and the reference value is calculated, and this difference is stored in the write/read memory 46 as needed, and a +1 counter operation signal is sent to the counter 49 via the buffer 48. The data stored in the memory 46 becomes the "previous data" in step S2 during the next operation, and is added up with the new input data.

The controller 18 shown in FIG. 1 has a built-in temperature control program, and the operation program shown in FIG. 4 is designed to interrupt the main program a certain number of times within a certain period of time. Therefore, although the flowchart of FIG. 4 is not in a cyclical format, the operations from start to finish are performed a set number of times.

Not only the brine temperature but also the terminal heat pump 1
By also detecting the used current of No. 4, the accurate amount of used heat can be integrated and displayed on the counter 49 even if the operating capacity and heat exchange capacity change. Also, counter 4
9 always displays the amount of heat up to the previous time, so even if there is a power outage, the results are retained internally. During the heating operation of the air conditioning system, the amount of heat transferred from the brine 19 to the terminal heat pump is displayed on the counter 49, and during the cooling and heating operation, the amount of heat transferred in the opposite direction, that is, the amount of exhaust heat from the terminal heat pump 14 is displayed.

Furthermore, the controller 1 of the terminal heat pump 14
Since various devices and operating programs can be built into the 8, the calorimeter can be easily installed, and there is almost no need to make any improvements to the existing air conditioning system.

(Effects of the invention) As detailed above, according to the present invention, an appropriate amount of heat to be used can be determined from the amount of heat used based on the temperature sensor and the amount of heat used based on the current detection means. have Further, unlike the conventional method, a large number of parts such as a flow meter and a plurality of temperature sensors are not required, and the number of parts is reduced.

[Brief explanation of the drawing]

Fig. 1 is an air conditioning circuit diagram of an air conditioning system to which the calorimeter of the present invention is applied, Fig. 2 is a simplified air conditioning circuit diagram of a conventional product, Fig. 3 is a block circuit diagram of the calorimeter, and Fig. 4 is a simplified air conditioning circuit diagram of a conventional product.
The figure is a flowchart showing the operating sequence of the calorimeter. 11... Center heat pump, 12... Brine tank, 13... Brine pipe, 14... Terminal beat pump, 18... Controller, 19...
Brine, 31... Compressor, 36... Brine heat exchanger, 40... Temperature sensor, 41... Current detector, 45... Microprocessor, 49...
…counter.

Claims (1)

[Scope of utility model registration request] A temperature sensor that detects the outlet side temperature of a brine heat exchanger of an air conditioning system equipment to which brine at a constant temperature and a constant flow rate is fed; a current detection means that detects the current used by the air conditioning system equipment; and the temperature sensor. a control means for determining the amount of heat used at regular intervals from the detected temperature of the sensor and the current detected by the current detection means, accumulating the amount of heat used, and comparing the cumulative amount of heat used and reference heat amount data; A calorimeter for an air conditioning system, comprising: a counter that counts when cumulative heat usage data is higher than reference heat usage data based on a comparison signal of and displays a value corresponding to the heat usage.