JPH034818B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Technical Field> The present invention relates to a heat pump type heat collecting device that uses solar heat and air heat as heat sources.

<Prior art> Conventionally, in a heat collecting device using solar heat or air heat as a heat source using a heat pump, a method for controlling the compressor capacity is to detect the outside temperature and increase the rotation speed of the compressor as the outside temperature increases. Methods are being considered to control this so that it becomes lower. This method is effective for reducing the power consumption of the compressor and improving the equipment's bulk coefficient, but since the heating capacity is affected by outside air conditions, especially in winter, the temperature of the supplied fluid (city water If the outside temperature is high even though the temperature is low, the rotation speed of the compressor will be low, and the target boiling temperature may not be reached due to insufficient capacity.
This was inconvenient in terms of access to hot water.

<Purpose> In view of the above, the present invention provides a solar heat/air heat collector capable of controlling the capacity of a compressor so that the heating capacity reaches a target heating capacity, thereby preventing a lack of heating capacity. The purpose is to provide

<Example> An example of the present invention will be described below with reference to FIGS. 1 and 2. This includes a compressor 1 that compresses and discharges a heat medium, and a compressor connected to the discharge side of the compressor. A heat collection circuit 5 is constituted by a condenser 2 and a heat collector 4 whose one side is connected to the condenser 2 via a throttle device 3 and the other side is connected to the compressor 1, and is a hot water storage tank for storing the fluid to be used. 6 and a working fluid heater 8 arranged outside the hot water storage tank 6 via a circulation pump 7 and having a heat exchange relationship with the condenser 2 are connected to each other to form a fluid heat circuit 9. , the compressor 1 is of variable capacity type, and a first temperature detector 11 is provided at the inlet of the fluid heater 8.
A second temperature sensor 12 is provided at the outlet of the hot water tank 6, and a third temperature sensor 15 is provided for detecting the outside temperature or the temperature of the fluid supplied to the hot water tank 6.
A control circuit 13 is provided that controls the capacity of the compressor 1 based on the output signals of the third temperature detectors 11, 12, and 15. Target heating capacity determining means 2 for determining target heating capacity according to
0a, a heating capacity calculation means 20b for calculating the heating capacity of the heat collecting circuit 5 from the temperature difference detected from the first temperature detector 11 and the second temperature detector 12, and the target heating capacity determination means 20a. Comparison calculation means 20c compares and calculates the heating capacity from the heating capacity calculation means 20b with the target heating capacity from the heating capacity calculation means 20b, and based on the output signal from the comparison calculation means 20c, the heating capacity is higher than the target heating capacity. A frequency at which an operating frequency signal is output to the compressor 1 so that the operating frequency of the compressor 1 is lowered when the heating capacity is larger than the target heating capacity, and the operating frequency of the compressor 1 is increased when the heating capacity is smaller than the target heating capacity. It is composed of a conversion circuit 14.

In FIG. 1, the heat collector 4 is composed of a pipe equipped with black-painted fins, and is capable of collecting solar heat and air heat. Further, the compressor 1 has a variable rotation speed by a frequency conversion circuit 14. Further, as the throttle device 3, an expansion valve driven by a stepping motor is used. The expansion valve 3 controls the flow rate of the heat medium using a temperature sensor (not shown) installed at the entrance and exit of the heat collector 4 so that the heat collection in the heat collector 4 is performed under optimal conditions. On the other hand, the fluid heating circuit 9 is formed by sequentially connecting a hot water tank 6, a circulation pump 7, a fluid heater 8, and a hot water storage tank 6. The condenser 2 and the fluid heater 8 are held in a heat exchange relationship, forming, for example, a double tube heat exchanger 10. and the control circuit 1
3 is a main control circuit 13A that calculates heating capacity from the temperature difference detected from the first and second temperature detectors 11 and 12 and outputs a control signal according to the target heating capacity;
and a frequency conversion circuit 14 that outputs an operating frequency signal to the compressor 1 based on the output signal of the main control circuit 13A.

Note that the target heating capacity can be determined as follows.
In other words, if the fluid supply (water supply) temperature changes depending on the season, but the target boiling temperature is constant throughout the year, the hot water supply load (heating load) will be large in the winter, small in the summer, and low in the intermediate period. is an intermediate load between the two. Therefore, in order to store hot water at the target boiling temperature equal to the capacity of the hot water storage tank 6 at a certain time (target boiling time), it is necessary to increase the target heating capacity in the winter, and conversely, in the summer, the target heating capacity must be increased. can be made smaller. That is, it is possible to increase the coefficient of performance by reducing the amount of work in the compressor 1 as much as possible. The target heating capacity to be changed is determined by detecting the outside temperature at a certain time in the morning and determining the season from this outside temperature in the control circuit 13. In this example, an outside temperature detector 15 is provided to detect the target heating capacity, and the output signal of the outside temperature detector 15 is input to the main control circuit 13A. Next, the heat collecting effect will be explained. The high-temperature, high-pressure heating medium gas compressed by the compressor 1 flows into the condenser 2,
It exchanges heat with the fluid (water) flowing through the fluid heater 8 which is in a heat exchange relationship, condenses and liquefies, and reaches the expansion valve 3.
When passing through the expansion valve 3, it expands adiabatically and is depressurized.
It becomes an unevaporated heat medium at low temperature and low pressure. The heat medium then flows into the heat collector 4, absorbs solar heat and air heat, is gasified, and enters the compressor 1 again to repeat the above cycle.
On the other hand, the water in the hot water storage tank 6 is sent to the fluid heater 8 by the circulation pump 7, heated and heated, and then flows into the hot water storage tank 6.

At this time, the temperatures at the inlet and outlet of the fluid heater 8 are input to the main control circuit 13A from the first and second temperature detectors 11 and 12, and in the main control circuit 13A, the temperatures at the inlet and outlet of the fluid heater 8 are adjusted to a constant temperature in advance. The heating capacity is constantly detected using the set water flow rate.
Then, at a certain time in the morning, the outside temperature is detected by the outside temperature detector 15 to determine the season, the target heating capacity is automatically determined, and the main control circuit 13A
to be memorized.

During that day's operation, the rotation speed of the compressor 1 is controlled according to changes in outside air conditions so that the target heating capacity is achieved. That is, if the amount of heat collected by the heat collector 4 increases due to the increase in solar radiation, outside temperature, etc., the rotation speed of the compressor 1 will be lowered to reduce the amount of work of the compressor 1, that is, the power consumption, and achieve a high coefficient of performance. drive. Furthermore, when sunlight, outside temperature, etc. become low, the rotation speed of the compressor 1 is increased to increase the amount of work of the compressor 1, and the compressor 1 is operated so as to obtain the target heating capacity. A flowchart of the control is shown in FIG.

Note that the target heating capacity can be determined by methods other than those described above. That is, in FIG.
Instead, a supplied fluid temperature detector 16 is provided at the fluid supply port 6a of the hot water storage tank 6, and the temperature detector 16 detects the temperature of the fluid supplied from the supply port 6a of the hot water storage tank 6 during hot water supply on the previous day. The season is determined based on the supplied fluid. Then, the target heating capacity for that day's operation is automatically determined. Note that the capacity control of the compressor 1 is the same as described above. A flowchart of this control is shown in FIG.

<Effects> As is clear from the above description, the present invention includes a compressor that compresses and discharges a heat medium, a condenser connected to the discharge side of the compressor, and a condenser connected to the discharge side of the compressor. A heat collection circuit is constituted by a heat collector connected to the compressor on one side and a heat collector connected on the other side to the compressor; In a heat collection device in which a fluid heating circuit is configured by interconnecting vessels,
The compressor is of a variable capacity type, and a first temperature sensor is provided at the inlet of the fluid heater, and a second temperature sensor is provided at the outlet of the fluid heater, and the compressor is configured to adjust the outside temperature or the supply to the hot water storage tank. A third temperature detector is provided to detect the temperature of the fluid, and a control circuit is provided to control the capacity of the compressor based on the output signals of the first, second, and third temperature detectors, and the control circuit includes:
target heating capacity determination means for determining a target heating capacity according to the season from the temperature detected by the third temperature detector; heating capacity calculation means for calculating the heating capacity of the thermal circuit; comparison calculation means for comparing and calculating the target heating capacity from the target heating capacity determination means and the heating capacity from the heating capacity calculation means; Based on the output signal from the comparison calculation means, the operating frequency of the compressor is lowered when the heating capacity is larger than the target heating capacity, and the operating frequency of the compressor is reduced when the heating capacity is smaller than the target heating capacity. To increase the operating frequency,
and a frequency conversion circuit that outputs an operating frequency signal to the compressor.

Therefore, according to the present invention, the target heating capacity is determined depending on the season, and the heating capacity is constantly detected based on the temperature difference between the inlet and outlet of the heater, and the heating capacity is adjusted to the target heating capacity. By controlling the operating frequency of the compressor so as to achieve the desired boiling temperature, it becomes possible to obtain hot water at the target boiling temperature almost every day at the target boiling time.

In addition, in the summer, the target heating capacity is small, so the heating capacity is also small, and even in the winter, when the sunlight and outside temperature are high, the target heating capacity is small, reducing the load on the compressor. Economical driving becomes possible.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a solar/air heat collector showing one embodiment of the present invention, Fig. 2 is a control flowchart of the same, and Fig. 3 is a control flowchart showing another embodiment of the present invention. FIG. 4 is a functional block diagram of the present invention. 1: Compressor, 2: Condenser, 3: Squeezing device, 4:
Heat collector, 5: heat collection circuit, 6: hot water storage tank, 7: circulation pump, 8: heater, 9: heating circuit, 10: heat exchanger, 11, 12: temperature detector, 13: control circuit.

Claims (1)

[Claims] 1. A compressor that compresses and discharges a heat medium, a condenser connected to the discharge side of the compressor, one side connected to the condenser via a throttle device, and the other side connected to the compressor. A heat collection circuit is constituted by a heat collector connected to the machine, and a hot water storage tank that stores the working fluid and a working fluid heater that is in a heat exchange relationship with the condenser outside the hot water storage tank are connected to each other. In the heat collection device configured with a fluid heating circuit, the compressor is of a variable capacity type, and a first temperature detector is provided at the inlet of the fluid heater, and a second temperature detector is provided at the outlet of the fluid heater. A third temperature detector is provided to detect the outside air temperature or the temperature of the fluid supplied to the hot water storage tank, and the capacity of the compressor is controlled by the output signals of the first, second, and third temperature detectors. A control circuit is provided, the control circuit includes: target heating capacity determining means for determining a target heating capacity depending on the season from the temperature detected by the third temperature detector; heating capacity calculation means for calculating the heating capacity of the heat collecting circuit from the temperature difference detected by the second temperature detector; a comparison calculation means for comparing the heating capacity with the heating capacity; and based on the output signal from the comparison calculation means, the operating frequency of the compressor is lowered when the heating capacity is greater than the target heating capacity, and 1. A heat collection device comprising: a frequency conversion circuit that outputs an operating frequency signal to the compressor so as to increase the operating frequency of the compressor when the heating capacity is low.