JP2002195650A - Storage type hot water supply apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a storage type hot water supply apparatus, in which a contract is made according to a time zone electric lighting rate system, hot water is boiled by utilizing the night-time zone of relatively low electric lighting rate principally, and water in a tank is boiled efficiently at a low rate utilizing complementarily the high rate daytime zone. SOLUTION: The storage type hot water supply apparatus makes a contract according to a time zone electric lighting rate system utilizing daytime power and midnight power. At night-time zone, hot water in a tank is boiled through heat pump heat collecting operation and at daytime zone, hot water in the tank is boiled through solar heat collecting operation or heat pump heat collecting operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-water storage type hot water supply apparatus for heating water in accordance with a time-of-day lamp fee system.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Publication No. 19458/1992, there is known a hot water storage type hot water supply apparatus in which hot water in a hot water storage tank is heated using a solar heat collector. ing. In this hot-water storage type hot water supply device, the solar heat collector has the advantage of being an energy-saving device using solar energy, but is susceptible to the weather, and has the inconvenience of not being able to collect and boil heat when necessary. In addition, a method is used in which a heat pump collector capable of constantly collecting heat even from atmospheric heat is used in combination to compensate for unstable elements of solar heat collection.

[0003] In this hot water storage type hot water supply apparatus, when solar heat collecting conditions are satisfied, such as when the amount of sunshine exceeds a predetermined value on a sunny day, solar heat collecting operation is performed to utilize solar energy. The water pump in the tank is boiled at a low running cost, and the heat pump heat collection operation is executed when the solar heat collection conditions are not met, such as when the sunshine falls below a predetermined level on cloudy or rainy days. Then, the hot water in the tank is heated using atmospheric heat.

[0004]

By the way, the electric power for boiling hot water with such a hot water storage device is usually
It was common to use the pay-as-you-go rate system at 7:00 to 17:00 in the daytime. However, the contracted power system with the power company is about 30% more expensive in the daytime from 7:00 to 23:00 than the metered light rate system, but is about 70% cheaper in the nighttime from 23:00 to 7:00. There is a time-based lighting fee system. Accordingly, it has been desired to contract under such a time-based light rate system and to lower the electricity rate mainly by boiling water and hot water at night time when the light rate is low.

The present invention has been made in view of such a point. Most of the hot water in the tank is heated by the heat pump heat collecting operation during the nighttime when the charge is low, and the daytime use is performed during the daytime. It is possible to select the solar heat collection operation or the heat pump heat collection operation according to the sunshine conditions at that time for the replenishment of the hot water and the shortage that could not be heated at night, and to lower the electricity bill as a whole by boiling the water in the tank. It is an object of the present invention to provide a hot water storage type hot water supply apparatus as described above.

[0006]

According to a first aspect of the present invention, there is provided a hot water supply type hot water supply apparatus, comprising: a heat pump collector having a closed circuit having a compressor, a condenser, and an evaporator; A solar heat collector connected in parallel; and a switching means for selectively switching one of an evaporator and a solar heat collector to the compressor and the condenser. Electricity according to the hourly light tariff system that uses daytime power and midnight power in a hot-water storage type water heater that heats water in a tank through a condenser that becomes a heat exchanger by one of the thermal operations In the nighttime period, the water in the tank is heated by the heat pump heat collection operation at a cheap electricity rate, and in the daytime time, the solar heat collection operation or the heat pump heat collection operation is used to supplement the tank water. In which was to raise boil the water. With this configuration, most of the hot and cold water in the tank is heated by the heat pump heat collection operation during the nighttime when the charge is low, and it is used in the shortage that could not be heated at night during the daytime or during the daytime. The solar heat collecting operation or the heat pump heat collecting operation is selected depending on the sunshine condition at the time of the replenishment of the hot water and the like, so that the hot water in the tank is boiled and the overall electricity rate can be reduced.

In the hot water storage type hot water supply device according to the second aspect, the hot water in the tank is heated by the heat pump heat collecting operation at a high rotation speed during the night time, and the solar heat collecting operation at a low rotation speed during the day time. The water in the tank is heated by the heat pump heat collecting operation at a low rotation speed, and the electricity rate can be further reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the hot water supply type hot water supply apparatus of the present invention will be described below with reference to the drawings.

[0009]

FIG. 1 is a block diagram of a hot water supply type hot water supply apparatus.
Is a tank, which adopts a hot-water supply method with a first stop push-up type.
A water supply pipe 3 having a water shutoff valve 2 connected to a water supply pipe is connected to a lower part of the tank 1, and a water supply pipe 4 connected to a hot water supply pipe is connected to an upper part of the tank 1. The water supply pipe 4 is, for example, a bathroom, It is connected to hot water tap 5 installed in kitchens and washrooms.

A circulation pipe 6 is provided near the lower portion of the tank 1.
The circulation pipe 6 is provided with a circulation pump 7 for forcibly circulating hot and cold water in the tank 1.

Reference numeral 8 denotes a heat pump heat collector, which is a closed circuit in which a compressor 9, a condenser 10, a solenoid valve 11, an expansion valve 12, an evaporator 13, and a gas-liquid separator 14 as switching means are connected in series. , And a refrigerant is sealed in this closed circuit. The compressor 9 includes a motor that can be controlled by an inverter. The condenser 10 is connected to the circulation pipe 6,
This condenser 10 is configured as a heat exchanger 15.
The evaporator 13 has a blower fan 16 for sending outside air and a blower motor 17 for rotating the blower fan 16.

Reference numeral 18 denotes a solar heat collector, which has an electromagnetic valve 19 as switching means and is connected to the evaporator 13 in parallel. The solar collector 18 is installed in a place with good sunshine conditions, such as on a roof.

When the solenoid valves 11 and 19 are opened and the solenoid valve 19 is closed, the refrigerant flows to the evaporator 13 to perform the heat pump heat collection operation. By closing and opening the solenoid valve 19, the refrigerant flows to the solar heat collector, and the solar heat collecting operation is executed.

Further, the tank 1 is provided on the outer wall of the body of the tank 1.
A plurality of hot water temperature detection sensors 20 are provided as hot water temperature detecting means for detecting the hot water temperature and the remaining hot water amount in the hot water.

An outside air temperature sensor 22 is provided at an outside position of the product or at an inside position communicating with the outside of the product.
The solar heat collector 18 is provided with a heat collecting temperature detection sensor 23 for detecting a heat collecting temperature.

Reference numeral 24 denotes a control device as operation control means. The control device 24 receives detection signals from a plurality of hot and cold water temperature detection sensors 20, an outside air temperature detection sensor 22, a heat collection temperature detection sensor 23, and the like. Is done. This control device 2
4, the circulation pump 7, the compressor 9, the blower motor 17,
The drive of the solenoid valves 11 and 19 is controlled.

The control device 24 includes a heat collection temperature detection sensor 23
Has a function of an operation control means for operating one of a solar heat collecting operation and a heat pump heat collecting operation in accordance with the heat collecting temperature detected in step (1). Reference numeral 25 denotes a remote controller which performs a remote operation, and has a function of sending a command of each operation mode described later to the control device 24 and displaying its operation state.

To explain the solar heat collecting operation, the solenoid valve 11 is closed, the solenoid valve 19 is opened, and the compressor 9 is driven at a low rotation speed. As a result, as shown by solid arrows in FIG.
The refrigerant flows in the order of 0, the solar collector 18, and the gas-liquid separator 14. The refrigerant vaporized by the solar heat in the solar collector 18 is sent to the condenser 10 to be liquefied, and the heat of the refrigerant is given from the condenser 10 to the hot and cold water in the circulation pipe 6 to exchange heat. At this time, the circulation pump 7 is driven, and the hot water in the lower portion of the tank 1 is forcibly circulated through the circulation pipe 6 so as to return to the inside of the tank 1 again, and the entire amount of hot water in the tank 1 is boiled.

In the heat pump heat collecting operation, the solenoid valve 11 is opened and the solenoid valve 19 is closed, the compressor 9 is driven at a high speed, and the blower fan 16 is operated.
Is driven. Thereby, as shown by the broken line arrow in FIG. 1, the compressor 9, the condenser 10, the expansion valve 12, the evaporator 13,
The refrigerant flows in the order of the gas-liquid separator 14. The refrigerant that has been heat-exchanged with the outside air by the evaporator 13 and vaporized is liquefied in the condenser 10, and the heat of the refrigerant is given from the condenser 10 to the hot and cold water in the circulation pipe 6 for heat exchange. At this time, the circulation pump 7
Is driven to forcefully circulate the lower portion of the hot water in the tank 1 through the circulation pipe 6 so as to return to the inside of the tank 1 again, and the entire amount of hot water in the tank 1 is boiled.

Next, in FIG. 2, the control device 25 has three operation modes, an operation mode corresponding to the hourly lamp fee, a standard operation mode, and a solar operation mode. An operation for raising the temperature and boiling of the hot water in 1 is performed.

In the operation mode corresponding to the hourly lamp fee, the heat pump heat collecting operation is performed at a high rotation speed, for example, 66 Hz, and the entire amount of hot and cold water in the tank 1 is covered in the nighttime period from 23:00 to 7:00. Boil. During the daytime hours from 7:00 to 17:00, hot water is mainly used for bath water supply and the like by the evening when a large amount of hot water is used, and operation is performed when the used water is replenished. Is done. In this case, the plurality of temperature detection sensors 20 detect the amount of remaining hot water and boil up a replenishing amount corresponding to the remaining hot water amount. And
When the heat collection temperature detected by the heat collection temperature detection sensor 23 that detects the heat collection temperature of the solar heat collector 18 is higher than a set value, the boiling operation performs a solar heat collection operation at a low rotation speed, for example, 28 Hz, If the rotation speed is low, for example, 2
The operation is stopped when the temperature rises or at 17:00 in the 8 Hz heat pump heat collection operation.

In the standard operation, the season is determined based on the outside air temperature at the start of the morning operation detected by the outside air temperature detection sensor 22, and the three modes (not shown) of a winter mode, a spring-autumn mode, and a summer mode are determined. drive. During the time period from 7:00 to 8:00, the heat pump heat collecting operation is performed. 1 from 8:00
If the heat collection temperature detected by the heat collection temperature detection sensor 23 is higher than the set value in the time period until 2:00, the solar heat collection operation is performed, and if the heat collection temperature is low, the heat pump heat collection operation is performed. The heat pump heat collection operation is performed from 12:00 until the temperature reaches the set temperature. At this time, the heat pump heat collection operation is performed by changing the frequency of the compressor 9 with an inverter to control the number of rotations to change the capacity. Increase
Conversely, in the season when the outside air temperature is high, since the boiling is fast, control is performed to increase the rate of operation at a low rotation speed. The solar heat collecting operation is performed at a low rotation speed of, for example, 28 Hz.

In the solar heat collection operation mode, 1
If the heat collection temperature detected by the heat collection temperature detection sensor 23 of the solar heat collector 18 is higher than the set value in the time zone until 7:00, the solar heat collection operation is performed, and the heat collection temperature is lower than the set value. In such a case, the solar heat collection operation is stopped. 1
When the temperature reaches the set temperature by 7:00 or at 17:00, the solar heat collection operation is stopped.

As described above, in the hot water supply type water heater having three operation modes, ie, the hourly electric lamp charge operation mode, the standard operation mode and the solar operation mode, the operation mode desired by the user is selected from the remote controller 25. Then, the hot water in the tank 1 is boiled.

Although there is a time-based lighting fee system in which the night time zone is from 22:00 to 8:00, this time zone may be set. Alternatively, the selection switch may be used to select from any number. Further, with respect to driving during the daytime, a setting switch may be provided so that the presence or absence of driving can be selected.

[0026]

According to the hot water storage type hot water supply device according to the first aspect of the present invention, by using the operation mode corresponding to the hourly electric lamp fee, the hot water collecting operation in the tank is performed by the heat pump collecting operation in the nighttime when the fee is low. Boost most, select the solar heat collection operation or heat pump heat collection operation according to the sunshine conditions at that time, supplementing the shortage that could not be heated at nighttime in the daytime and the amount used during the daytime,
Electricity bills can be reduced as a whole by boiling water in the tank.

[0027] In the hot water storage type hot water supply device according to the second aspect, the hot water in the tank is boiled by the heat pump heat collection operation at a high rotation speed during the nighttime, and the solar heat collection operation at a low rotation speed during the daytime. The water in the tank is heated by the heat pump heat collecting operation at a low rotation speed, and the electricity rate can be further reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a hot water supply type hot water supply apparatus according to an embodiment of the present invention.

FIG. 2 is a chart showing operation states of the hot water storage type hot water supply device in each operation mode.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tank 6 Circulation piping 7 Circulation pump 8 Heat pump collector 9 Compressor 10 Condenser 11 Solenoid valve as switching means 12 Expansion valve 13 Evaporator 14 Gas-liquid separator 15 Heat exchanger 18 Solar collector 19 As switching means Solenoid valve 24 control device

Claims (2)

[Claims] A heat pump collector having a closed circuit having a compressor, a condenser, and an evaporator; a solar collector connected in parallel to the evaporator; Switching means for selectively switching one of the evaporator and the solar heat collector with respect to the condenser, and the heat exchanger and the heat exchanger by one of the heat pump heat collecting operation and the solar heat collecting operation. A hot-water storage type water heater that heats water in a tank through a condenser that is contracted with daylight and late-night power using a time-based light tariff system. A hot-water storage type hot-water supply device characterized in that the hot water in the tank is heated by a solar heat collecting operation or a heat pump heat collecting operation during daytime. 2. In the nighttime period, the hot water in the tank is boiled by the high-speed heat pump heat collection operation, and in the daytime period, the low-speed solar heat collection operation or the low-speed heat pump heat collection operation is performed. 2. A hot water supply apparatus according to claim 1, wherein the hot water in the tank is heated.