JPH0129456Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to the configuration of a hot water system that performs heating using a heat pump heating operation priority method that primarily uses hot water heated by a heat pump water heater, and that enables additional heating with a hot water boiler when capacity is insufficient.

[Prior art]

A water heating system in which a heat pump water heater and a hot water boiler are installed side by side to supply hot water to places that require heating is well known; The hot water boiler is configured to reheat the hot water heated by the water heater to a higher temperature than the water heater, and the water temperature thermometer is used to start and stop the hot water boiler so that the water temperature in the hot water boiler reaches a predetermined temperature. In addition, when the inlet water temperature of the heat pump water heater becomes higher than the set temperature, this is considered to be a state where the heating load has become small, and the heat pump water heater is controlled to stop using the inlet water temperature thermostat. This has been the most common operating method in the past. In systems that use water heaters with such a structure to heat areas that require heating, the system does not control the start and stop of the water heater using the atmospheric temperature of the area as a reference value for control, but instead controls the inlet water temperature of the water heater and the boiler. Since it is based on the water temperature, it is difficult to appropriately select the set temperature of the inlet water temperature thermostat and water temperature thermostat so as to demonstrate heating capacity that adequately responds to load fluctuations, and therefore, it is difficult to perform proper heating operation control. There was a need for improvement as there was a risk of problems with reliability.

[Purpose of invention]

In view of the fact that conventional water heating devices of this type have some points to be improved, the present invention has been devised, and it is designed to prioritize the heating operation of heat pump water heating devices. Improving operational economy and control reliability by controlling the operation of heat pump water heaters and hot water boilers reliably regardless of fluctuations in the heating load, and based on the ambient temperature of the heating demand location. The purpose of the present invention is to achieve these goals and promote the spread of water heating devices.

[Structure of the idea]

Therefore, the present invention forms a serial hot water circuit with the hot water passage of the heat pump water heater on the upstream side and the hot water passage of the hot water boiler, which can heat the water at a higher temperature than the water heater, on the downstream side. In a water heating system in which a heat exchange coil installed at a heating demand point is connected in a cyclical manner, the high temperature side set point is determined by comparing the detected temperature with the two-stage set temperature of the high temperature side set point and the low temperature side set point. When the detected temperature is higher than the high-temperature set point, a high-temperature side stop signal is generated, and when it is lower, a high-temperature operation signal is generated.When the detected temperature is higher than the low-temperature set point, a low-temperature side stop signal is generated, and when it is lower, a low-temperature side signal is generated. A two-stage temperature controller that outputs operating signals is provided at a location where the ambient temperature in the heating demand area can be detected, and a stop signal is issued when the detected temperature is higher than the set point for the water heater, and an operating signal is issued when the detected temperature is lower than the set point for the water heater. The temperature sensing part of the water temperature thermometer for the water heater that outputs is installed at the entrance of the hot water passage of the heat pump pump water heater, and a stop signal is output when the detected temperature is higher than the boiler set point, and an operation signal is output when it is lower than the boiler set point. A temperature sensing part of the water temperature thermometer is provided near the outlet of the hot water passage of the hot water boiler, and when both the high temperature side operation signal and the operation signal of the water temperature thermometer for the water heater are output, the heat pump water heater is operated. The heat pump water heater is stopped when either the high temperature side stop signal or the water temperature thermostat stop signal for the water heater is output, and the heat pump water heater is stopped when both the low temperature side operation signal and the boiler water temperature thermostat operation signal are output. The hot water boiler is characterized by forming a control circuit that stops the operation of the hot water boiler when either the low temperature side stop signal or the boiler water temperature thermostat stop signal is output, By directly and reliably controlling the area heated by the heat pump water heater and the area heated by the hot water boiler based on ambient temperature conditions such as room temperature, priority is given to heating operation by the heat pump water heater, and the hot water boiler is heated during high loads. For reheating the
This makes it possible to clearly define the respective heating responsibilities.

【Example】

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic structural diagram of a heating device according to an embodiment of the present invention, in which 1 is a heat pump water heater, and a water-to-water heat exchanger for generating hot water, such as a shell tube heat exchanger, acts as a condenser. A refrigeration circuit consisting of an exchanger, a compressor, an expansion valve, a water-to-water heat exchanger that uses well water as a heat source and acts as an evaporator, etc. is omitted. Reference numeral 2 denotes a hot water boiler that performs heating operation using petroleum, natural gas, or the like as fuel, and is capable of heating hot water to a higher temperature than the water heater 1 described above. 1 _A is a hot water passage in the shell tube heat exchanger of the heat pump water heater 1, and heat exchange is carried out between the high pressure and high temperature refrigerant gas flowing in the refrigerant passage of the heat exchanger and the water flowing in the hot water passage. The inlet of the hot water passage _1A is equipped with a system that detects the inlet water temperature and, for safety reasons, turns off the operation of the heat pump water heater 1 when the temperature reaches 55°C or higher. A temperature sensing part _5A of the water temperature thermostat 5 is provided to forcibly stop the water temperature thermostat 5. The water temperature thermostat 5 for the water heater is configured to output a stop signal when the detected temperature is higher than the set point for the water heater, for example 55° C., and to output an operation signal when the detected temperature is lower. 2 _A is a hot water passage consisting of the water side container of the hot water boiler 2, and the hot water in the hot water passage 2 _A is further heated by the amount of heat generated when fuel such as oil is burned, and then taken out from the outlet. However, near the outlet of this hot water passage _2A , there is a water temperature thermostat 6 that detects this water temperature and forcibly stops the operation of the hot water boiler 2 when the temperature reaches 60℃ or higher. A warm section _6A is provided. The boiler water temperature thermometer 6 is configured to output a stop signal when the detected temperature is higher than the boiler set point, for example 60° C., and to output an operation signal when it is lower. Reference numeral 3 denotes a water-to-air type heat exchange coil, which is installed at a place H that requires heating, such as a gardening house. Therefore, the hot water passage 1 of the heat pump water heater 1
_A and hot water passage 2 _A of hot water boiler 2 are the former 1 _A
are connected in series with the latter _2A on the upstream side and the latter 2A on the downstream side to form a serial hot water circuit, and this hot water circuit and the heat exchange coil 3 are cyclically connected, and the thus obtained circulating hot water passage Circulation pump 7 inside
is interposed, and by the energization of the pump 7,
Hot water is circulated in the order of hot water passage 1 _A → hot water passage 2 _A → heat exchange coil 3 → circulation pump 7 → hot water passage 1 _A. In addition, 8 is a bypass passage which has an on-off valve 9 in the middle and is connected in parallel to the hot water passage 1 _A , in case the return water from the heat exchange coil 3 becomes high temperature while the hot water boiler 2 is operating alone. In order to prevent the inconvenience of the refrigerant side of the shell tube heat exchanger becoming high pressure and melting the soluble material, the on-off valve 9 is opened to bypass the high temperature water. The control circuit that controls the operation of the heating device configured as described above will be explained with reference to FIGS. 1 to 3.
Reference numeral 10 denotes a controller consisting of an electronic control circuit, and the input port has a first one for independent operation of the heat pump water heater 1.
A switch 11, a second switch 12 for combined operation of the heat pump water heater 1 and the hot water boiler 2, and a third switch 13 for the individual operation of the hot water boiler 2 are connected, respectively, and the temperature sensing part 5 _A of the water temperature thermostat 5 is connected.
and a temperature setting device _5B , a temperature sensing part _6A and a temperature setting device 6B of the water temperature thermostat 6, a temperature sensing part _4A and a temperature setting device _4B of a two-stage temperature regulator ₄ , which will be described later, are connected, respectively. On the other hand, a first relay 15 for starting/stopping one heat pump water heater and a second relay 16 for starting/stopping two hot water boilers are connected to the output port, respectively. The controller 10 includes a temperature control circuit section 4, which corresponds to a temperature controller that operates upon receiving input from the temperature sensing section _4A and temperature setting device _4B , the temperature sensing section _5A , and the temperature setting device _5B . a temperature adjustment circuit section 5 corresponding to a temperature controller that operates in response to an input; a temperature adjustment circuit section 6 corresponding to a temperature controller that operates in response to input from the temperature sensing section 6 _A and the temperature setting device 6 _B ; It has an output circuit section 14 that emits an output signal to an output port, and the first relay 15 and the second relay 16
The mode of the control system for starting and stopping will now be explained with reference to the flowchart of FIG. Is the first switch 11 turned on?
(a) Is the second switch 12 turned on?
(b) Whether the third switch 13 is turned on?
Judging from (c), if only the second switch 12 is turned on, the heat pump water heater 1 and the hot water boiler 2
Since the operation is in combination with

[Hereinafter simply referred to as "chamber"] The temperature of H is detected and compared with the set value. Here, when the temperature adjustment circuit section 4 sets the temperature with the temperature setting device _4B , the difference between the high temperature side set point T _H corresponding to the scale displayed on the temperature setting device _4B and a constant value higher than this, for example, 5 By simultaneously setting two reference temperatures with the low-temperature side set point T _L that is lower by ℃, and comparing these two reference temperatures T _H and T _L with the room temperature,
Based on the high temperature side set point T _H , it outputs a high temperature side operation signal when the room temperature is low or high, and a high temperature side stop signal when it is _high . Low temperature side operation signal when low.
When the temperature is high, a low temperature side stop signal is output. Therefore, first compare the room temperature with the high temperature side set point T _H (d), and if the room temperature is ≧ T _H , there is no need for heating, so the heat pump water heater 1 and the hot water boiler 2 are left stopped ( E), On the other hand, if the room temperature is _{< T}

[55℃] and temperature control circuit section 5
Compare (f). If the result of this comparison is that the inlet water temperature is 55°C, heating is required under a heating load higher than _the standard load. (g), room temperature <
If it is T _L , a low temperature side operation signal is issued, and the hot water boiler 2 and the heat pump water heater 1 are started to operate in parallel based on both signals with the high temperature side operation signal (H). In this way, a heating operation can be carried out with sufficient margin by using a hot water device having sufficient heating capacity. On the other hand, since the result of the above comparison (g) is that the room temperature ≧T _L is about the standard load, the heat pump water heater 1 is operated alone, that is, heat pump heating, based on the high temperature side operation signal that has already been sent and is on hold. Give priority to driving (li). By the way, if the result of the comparison (f) in the temperature control circuit section 5 is that the inlet water temperature is >55°C, this is a light heating load, but in the heat pump water heater 1, the temperature difference with the heat source temperature is small and it can be ignored. Since this is a condition that causes a decrease in heating efficiency, the high temperature side operation signal is left on hold, and then the water temperature of hot water passage _2A and the set temperature are set.

A comparison with [60°C] is made in the temperature control circuit section 6 (N). If the result of this comparison (nu) is water temperature > 60℃, hot water boiler 2 will remain stopped (ru), while water temperature ≦
If the temperature is 60°C, the hot water boiler 2 is operated for heat retention (wo). The operation mode described above is an operation in which the heat pump water heater 1 and the hot water boiler 2 are combined, and the heat pump heating operation is prioritized, but apart from this, only the first switch 11 is turned on. When it is determined (a), the temperature control circuit section 4 compares the room temperature with the high temperature side set point T _H (d).
If room temperature ≧ T _H , the heat pump water heater 1 is left stopped (wa); on the other hand, if room temperature < _TH , then the temperature control circuit 5 adjusts the inlet water temperature of the hot water passage 1 _A and the set temperature.

[55℃] (F) If the inlet water temperature > 55℃, the heat pump water heater 1 will remain stopped (W), while if the inlet water temperature ≦55℃, the heat pump water heater 1 will remain stopped (W). to drive (li). Separately, when it is determined that only the third switch 13 is turned on (c), the above comparison is performed (d),
If room temperature≧T _H , hot water boiler 2 remains stopped (ru), while if room temperature<T _H , then temperature control circuit 6 adjusts the water temperature in hot water passage _2A and the set temperature.

[60℃] (nu), if the water temperature > 60℃, the hot water boiler 2 will remain stopped (ru), while if the water temperature ≦ 60℃, the hot water boiler 2 will be operated ( wo). In addition to the operation control based on the electronic control circuit described above, two examples of circuits using direct point temperature controllers 4, 5, and 6 are shown in FIGS. 4 and 5. In Figure 4, the 24-hour repeat timer 18 causes the heat pump water heater 1 and hot water boiler 2 to operate in parallel using late-night electricity for 8 hours from 11 p.m. to 7 a.m. the next day, and from 7 a.m. to 11 p.m. A switching system is adopted in which hot water boiler 2 is operated independently for 16 hours. That is, the automatic switching is performed by the timer contact 18 _A , which is closed between 11 p.m. and 7 a.m. the next day, and the timer contact 18 _B , which is closed between 7 a.m. and 11 p.m. The first relay 15 for starting and stopping aircraft 1 is connected to operation switch 1.
9. A contact 4 H which is an output contact of the two-stage temperature controller 4 _and closes when the room temperature is lower than the high temperature side set point _TH , the timer contact 18 _A , and the temperature controller 5.
The inlet water temperature is the set temperature at the output contact of

Contact _5-1 , which closes when the temperature is lower than [55°C], and contact 4 L _-1, which is the output contact of the temperature regulator 4, and which closes when the room temperature is higher than the low-temperature set point T _L. is closed, in other words, when power is supplied late at night, the room temperature is lower than the high-temperature side set point T _H and higher than the low-temperature side set point T _L , and the inlet water temperature of the heat pump water heater 1 is When the temperature is lower than the set temperature, the water heater 1 is energized and only the water heater 1 is operated for heating independently. Next, the third relay 17 for simultaneous operation of the heat pump water heater 1 and hot water boiler 2 is connected to the operation switch 1.
9. The contact 4 _H , the timer contact 18 _A , the contact _5-1 , the output contact of the temperature regulator 4, and the contact 4 _L-2 , which closes when the room temperature is lower than the low temperature side set point T _L. In other words, when both are closed, late-night power is supplied, the room temperature is lower than the low temperature side set point T _L , and the inlet water temperature of the water heater 1 is lower than the set temperature. Sometimes, it is energized to operate the hot water machine 1 and the hot water boiler 2 at the same time. On the other hand, the second relay 16 for starting and stopping two hot water boilers
The water temperature of the hot water boiler 2 is set at the operating switch 19, the contact _4H , the timer contact _18B , and the output contact of the temperature regulator 6.

When all contacts _6-1 that close when the temperature is lower than [60℃] are closed, in other words, during the time period from 7 a.m. to 11 p.m. when late night power is not supplied, and When the room temperature is lower than the high temperature side set point T _H and the water temperature of the hot water boiler 2 is lower than the set temperature, it is energized to cause only the hot water boiler 2 to perform an independent heating operation. As is clear from the above circuit description, the operating mode of the control circuit shown in FIG. 4 is substantially the operating mode shown in FIG. is the same as Next, the circuit shown in FIG. 5 will be explained. This is a manual operation system that performs three types of operation control by selecting the first to third switches 11 to 13 mentioned above, and is essentially the circuit shown in FIG. 3. There is no difference. That is, the first relay 15 is connected to the first switch 1
Normally open contact 2 of relay 20 that is energized by turning on
0 _A , 20 _D , the normally open contact 21 _A of the relay 21 is energized when the contact 4 _H and the contact _5-1 are closed, and the second switch 12 is turned on.
The contact _4H , the contact _5-1 , and the contact 4L _-1 are all energized when they are closed. Next, the second relay 16 is energized by turning on the third switch 13, and the normally open contacts _22A , 2 of the relay 22 are energized.
2 _C and the contact point _6-1 is formed so as to be biased when both of the contacts 6-1 are closed. On the other hand, the third relay 17 has a normally open contact 21 _A of the relay 21 which is excited when the second switch 12 is turned on.
The contact _5-1 and the contact 4 _L-2 are energized when both are closed. The three circuits described above are the high-temperature side operation signal and high-temperature side stop signal of the two-stage temperature controller 4 provided to adjust the temperature of the heating-demanding location, and the operation signal of the water temperature thermostat 5 for the water heater. The heating operation of the heat pump water heater 1 is started and stopped by the and stop signal, and the heating operation of the hot water boiler 2 is started and stopped by the low temperature side operation signal, the low temperature side stop signal, and the operation signal and stop signal of the boiler water temperature thermostat 6. It is clear that the heat pump water heater 1 includes a circuit that allows the heat pump water heater 1 to perform heating operation with priority over that of the hot water boiler 2.

[Effect of the idea]

The present invention is a water heating system that operates in combination with a heat pump water heater 1 and a hot water boiler 2.
Since the stage-operated temperature controller 4 detects the temperature of the place where heating is required and uses this signal to directly control the on/off of both devices 1 and 2, it is easy and accurate to set the temperature at the place where heating is required. can be controlled. Furthermore, the temperature range heated by the heat pump water heater 1 and the temperature range heated by the hot water boiler 2 are divided into two.
Since the heat pump water heater 1 is classified in stages and the heat pump water heater 1 is prioritized in operation, it is possible to improve both the operational economy and control reliability.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a schematic diagram of the structure of the device, FIG. 2 is a schematic diagram of the controller, and FIG. 3 is the controller shown in FIG. FIGS. 4 and 5 are flowcharts showing the operation, and are electrical control circuit diagrams according to each example of the present invention. 1...Heat pump water heater, 1 _A ...Hot water passage,
2... Hot water boiler, 2 _A ... Hot water passage, 3...
Heat exchange coil, 4...Two-stage temperature controller, 5
...Water temperature thermometer for water heater, 5 _A ...Temperature sensing part, 6...
…Boiler water temperature thermometer, 6 _A …Temperature sensing part.

Claims (1)

[Scope of utility model registration request] A serial hot water circuit is formed in which the hot water passage _1A of the heat pump water heater 1 is on the upstream side and the hot water passage _2A of the hot water boiler 2, which can be heated to a higher temperature than the water heater 1, is on the downstream side. In a hot water system in which a hot water circuit and a heat exchange coil 3 installed at a heating demand location are cyclically connected, a two-stage set temperature of a high temperature side set point T _H and a low temperature side set point T _L is compared with the detected temperature. When the detected temperature is higher than the high temperature side set point T _H , a high temperature side stop signal is generated, when it is low, a high temperature side operation signal is generated, and when the detected temperature is higher than the low temperature side set point T _L , a low temperature side stop signal is generated. A two-stage temperature controller 4 that outputs a low-temperature operation signal is installed at a location where the ambient temperature can be detected in the heating demand location, and a stop signal is output when the detected temperature is higher than the water heater set point. A temperature-sensing part 5 _A of the water temperature thermostat 5 for the water heater 5 which outputs an operating signal is installed at the inlet of the hot water passage 1 _A of the heat pump pump water heater 1, and outputs a stop signal when the detected temperature is higher than the set point for the boiler. , a temperature sensing part _6A of the boiler water temperature thermometer 6 which outputs an operation signal when the temperature is low is installed near the outlet in the hot water passage _2A of the hot water boiler 2,
When both the high temperature side operation signal and the operation signal of the water temperature thermostat 5 for the water heater are output, the operation of the heat pump water heater 1 is controlled by either the high temperature side stop signal or the stop signal of the water temperature thermostat 5 for the water heater. When the low-temperature side operation signal and the boiler water temperature thermostat 6 operation signal are output, the operation of the hot water boiler 2 is stopped, and the low-temperature side stop signal or the boiler water temperature A hot water device characterized in that a control circuit is formed to stop each of the hot water boilers 2 when any of the stop signals of the thermostat 6 is output.