JPS61101767A - Air-conditioning and hot-water supply heat pump device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a heat pump device for heating, cooling, and hot water supply that uses a heat pump to heat water in a hot water storage tank. The present invention also relates to a heat pump device for air conditioning and hot water supply that can economically heat water in a hot water storage tank using normal or second night power.

[Prior Art J] Conventionally, there is a heating and cooling system using a heat pump, as shown in FIG. 5, for example, in Practical Knowledge of Air Conditioning Facilities, 1976, Reprint P83.

In the figure, 1 is a compressor, 2 is a four-way valve for switching between air conditioning and heating, 3a and 3b are indoor heat exchangers, and 4 is a reversible refrigerant expansion mechanism that expands in accordance with the flow direction during cooling and heating. It is composed of valves 4a and 4b. 5 is an outdoor heat exchanger, and 6a and 6b are solenoid valves provided on the four-way valve 2 connection side of the indoor heat exchangers 3m and 3b.

In the conventional heat pump device configured in this way, when cooling multiple rooms, the high temperature and high pressure refrigerant gas discharged from the compressor 1 flows as shown in the solid arrow in the figure, as shown in Figure 5. From the four-way valve 2 to the outdoor heat exchanger 5,
Here it is cooled and condensed. The pressure of the condensed liquid refrigerant at an intermediate pressure is reduced by passing through the expansion valve 4a. At this time, the two-way solenoid valves 6a and 6b of the indoor heat exchangers 3a and 3b open due to the generation of loads, so the low-pressure liquid refrigerant from the expansion valve 4a is transferred to the indoor heat exchangers: 3p, 3b. It evaporates, absorbing heat from the indoor air and turning it into gas. This low-pressure refrigerant scum passes through the four-way valve 2, is sucked into the compression tube '4+, and the cycle of being compressed and discharged is repeated.

In addition, during heating operation, the high-temperature, high-pressure refrigerant gas discharged from the compressor 1 flows as shown by the broken line arrow in the figure and reaches the indoor heat exchangers 3a and 3b from the four-way valve 2, where it radiates heat. Heats the room by condensing. Furthermore, the condensed high-pressure liquid refrigerant is depressurized by passing through the expansion valve 4b,
This low-pressure quasi-refrigerant reaches the outdoor heat exchanger 5, where it is heated by the outside air and evaporates. The evaporated low-pressure gas passes through the four-way valve 2, is sucked into the compressor 1, is compressed again and discharged, and the cycle is repeated.

Furthermore, Fig. 6 shows an example of a conventional heating/cooling/hot water heat pump device (source: Refrigeration Vol. 58, No. 671, P22), and the same reference numerals as in Fig. 1 indicate the same straddle-corresponding parts.
In addition, 7 is an engineered hot water storage tank, and a hot water storage tank heating coil is provided inside the tank, and this heating coil 8 is connected in parallel to the series circuit of the indoor heat exchanger 3a and the solenoid valve 6a via the solenoid valve 6b. It is connected. 9 is the city water intake of hot water tank 6, 10
is a hot water supply faucet connected to the hot water storage tank 7.

In the heat pump device configured as described above, when heating hot water, the solenoid valve 6a is closed and the solenoid valve 6b is closed.
open. As a result, the high-temperature, high-pressure refrigerant gas discharged from the compressor 1 flows as indicated by the broken line arrow in Figure 2, passes from the four-way valve 2, passes through the solenoid valve 6b, and reaches the heating coil 8, where it radiates heat and condenses. By doing so, the water in the hot water tank 6 is heated. The condensed high-temperature, high-pressure liquid refrigerant is depressurized by passing through the expansion valve 4b, reaches the outdoor heat exchanger 5, is heated by the outside air, and evaporates. This low pressure gas then passes through a four-way valve 2 to a compressor 1.
The hot water is heated by repeating the cycle of being sucked into the tank and compressed again.

Also, during heating operation, the solenoid valve 6a is open and solenoid valve 6b is closed, and during cooling operation, the solenoid valve 6b is open and the solenoid valve 6a is closed, as shown by the broken line arrow or solid line arrow in FIG. Heating or cooling is performed by generating a flow of refrigerant, and its operation is similar to that described in FIG. 2.

[Problem that the invention seeks to solve]

However, when hot water is heated by the conventional heat pump device by Kosei-Ko mentioned above, one of the indoor heat exchangers 3a and 3b is replaced with a heating coil, and this heating coil is attached to the hot water tank, as shown in Fig. 5. Since this method heats the water in the hot water tank by heating the refrigerant circuit, it is not possible to perform economical operations such as recovering waste heat from cooling to heat hot water.

Furthermore, since it does not have an inverter, the rotation speed of the compressor cannot be controlled. Furthermore, the normal late-night power period (for example, from 11 p.m. to 7 a.m. the next day) and the second late-night power period (
For example, there are various problems such as not being able to drive economically by using the vehicle from 1:00 a.m. to 6:00 a.m.).

[Means for Solving the Problems J] Accordingly, the present invention provides a three-way valve on the discharge side of the compressor to guide high-temperature, high-pressure refrigerant from the compressor to a heating coil in a hot water storage tank to heat water. The condensed refrigerant is returned to the compressor through an expansion valve and an indoor/outdoor heat exchanger.

In addition, an inverter is installed to control the rotation speed of the compressor, and during the normal late-night power hours, it operates at a low frequency with a high coefficient of performance, and during the second late-night power hours, it operates at a high frequency that prioritizes performance. It is controlled by a mechanism.

[Effect]

In the air-conditioning/heating/hot-water heat pump device configured in this way, it is possible to recover waste heat from cooling, which can perform cooling and hot water heating at the same time. During the power hours, it is operated at a low frequency (or the lowest frequency) to increase the coefficient of performance, and during the second late night power hours, it is controlled to operate at a high frequency (or the highest frequency) in order to provide sufficient capacity. It turns out.

[Example 1] Figure 1 shows a configuration diagram showing one embodiment of the air conditioning/hot water supply heat pump device according to the present invention, and the same parts as in Figures 5 and 6 are indicated using the same symbols. be. 1
Reference numeral 1 denotes a three-way valve for switching the flow path of high-temperature, high-pressure refrigerant discharged from the compressor 1, and its inflow bow (a) and one discharge bow (b) and j are connected. Further, one end of the heating coil 8 of the three-way valve 11 is connected, and the other end of the heating coil 8 is connected to both ends of the expansion mechanism 4 via separate electromagnetic valves 12 and 13.

14 is an inverter for controlling the capacity of compressor l, 15 is the three-way valve 11. 'Solenoid valves 12, 13 and inverter 14. This timer-equipped controller 15 is configured to receive detection signals from a city water temperature detector 16 and a detector 17 that detects the lower water temperature of the hot water tank 7. .

Next, the operation of this embodiment configured as described above will be explained separately for each state.

(al During heating, the high temperature and high pressure cold g discharged from the compressor 1 is transferred to the three-way valve 11.
The inflow and discharge boats a and b pass through the broken line path of the four-way valve 2 to one or both of the indoor heat exchangers 3a and 3b, where they are condensed and then depressurized by the expansion mechanism 4.
It is further evaporated in the outdoor heat exchanger 5, and this evaporated refrigerant gas passes through the four-way valve 2 and returns to the compressor 1.

, (b) During cooling, the refrigerant discharged from the compressor 1 at this time flows through the three-way valves 1 and 1.
Inflow and discharge bow) From a and b, via the solid line path of the four-way valve 2, it reaches the outdoor heat exchanger 5, where it exchanges heat with the outside air and condenses, and is further depressurized by the expansion mechanism 4, and then returns to the room. It reaches one or both of heat exchangers 3a and 3b and evaporates. This evaporated gas refrigerant returns to the compressor 1 via the four-way valve 2.

(c) During cooling hot water supply In this case, the refrigerant discharged from the compressor 1 reaches the hot water tank heating coil 8 through the inflow and discharge boats a and b of the three-way valve 11, where it is condensed, and as a result, the temperature inside the hot water tank 7 is Heat the water. The condensed liquid refrigerant then passes through the electromagnetic valve 13, reaches the expansion mechanism 4, is depressurized, and then reaches one or both of the indoor heat exchangers 3a and 3b, where it absorbs indoor heat and evaporates. This gas refrigerant returns to the compressor 1 via the solid line of the four-way valve 2. In this way, hot water is supplied and heated at the same time as cooling.

(dl At this time, the refrigerant discharged from the compressor 1 is heated by the three-way valve 11.
The inflow and discharge of water from one side a and c leads to the hot water storage tank heating coil 8, where it condenses and heats the water in the hot water storage tank 7. The condensed liquid refrigerant then passes from the T-magnetic valve 12 through the expansion mechanism 4 to the outdoor heat exchanger 5, where it evaporates. The evaporated gas refrigerant returns to the compressor 1 via the four-way valve 2.

The above describes the flow of refrigerant during each operation, but
During the heating season, heating is usually given top priority and heating operation is performed according to the heating load.

As shown in Figure 2, the heating load in a home generally has its first peak between 6 a.m. and 9 a.m., and then during the day (12 p.m.).
There is a second peak from 15:00 to 155:00 depending on the weather, and a third peak from evening to night (from 17:00 to 24:00), and after 24:00 there is no load ( Become.

Therefore, in this invention, the late-night power hours after 24:00 (6:00 p.m.
℃, when running hot water heating operation using
This will be explained with reference to the operation control flow shown in FIG. It is assumed that the program for the control procedure shown in FIG. 3 is stored in the internal memory of the control device 15.

In FIG. 3, step 81 is a manual operation mode selection part, and if it is determined that the cooling mode is selected, the process moves to step S2 and the three-way valve 11. Controls solenoid valves 12.13. Further, if it is determined in step S1 that the mode is other than cooling, the process proceeds to step S3, and if there is a heating load, the process proceeds to step S4 to perform heating operation.

On the other hand, if it is determined in step S3 that there is no heating load, the process proceeds to step S5, in which it is determined whether the water temperature in the hot water storage tank 7 is below the boiling set temperature TH°C, and if it is above the set value T, the process proceeds to step S5. Return to step 83.

When the water temperature in the hot water storage tank 7 is below the set value TH, heating of the hot water storage tank is started. In steps S6 and 87, a timer determines the late-night power period. If it is a normal late-night power period, the process proceeds to step S9 and low-frequency operation is performed, and if it is a second late-night power period, the process proceeds to step S8 to perform high-frequency operation. Performs capacity priority operation based on frequency.

Further, if it is outside the late night time period, the process proceeds to step 10 to determine whether it is within the set time.

If it is outside the time, the process returns to step S3 again. If the water temperature of the hot water storage tank is equal to or higher than the daytime boiling temperature set temperature TH° C. even within the specified time, the process returns to step S3. Also, the water temperature of the hot water tank is the set temperature TH.
When the temperature is below .degree. C., the inverter frequency H2 is increased to execute a capacity priority operation that increases the rated hot water heating capacity as shown in FIG.

In the above embodiment, the case where there are two indoor heat exchangers has been described, but the same can be applied to the case where there are three or more indoor heat exchangers. Further, instead of the three-way valve 11, a combination of two two-way valves may be used, or the three-way valve 11 may be an inductive valve that can adjust the flow rate.

〔Effect of the invention〕

As explained above, the air conditioning/hot water heat pump device according to the present invention uses late-night electricity (including regular and secondary power) for hot water heating operation, and operates by appropriately controlling the frequency of the inverter. This makes it possible to operate with a high coefficient of performance, and has the effect of reducing truck costs.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing an embodiment of the air conditioning/hot water supply heat pump device ri according to the present invention, Fig. 2 is a heating load generation pattern diagram of an ordinary house, and Fig. 3 is a control of the timer-equipped control device shown in Fig. 1. FIG. 4 is a flowchart showing the operation, FIG. 4 is a diagram showing the relationship between inverter frequency and rated hot water heating capacity, and FIGS. 5 and 6 are configuration diagrams showing a conventional heating/cooling/hot water heat pump device. 1... Compressor, 2... Four-way valve, 3a, 3b...
Indoor heat exchanger, 4... Expansion mechanism, 5... Outdoor heat exchanger, 7... Hot water storage tank, 11... Three-way valve (switching valve), 8
...Heating coil, 12.13...Solenoid valve, 14...
・Inverter, 15...Control device with timer, 16°
...City water temperature detector, 17...Hot water tank temperature detector. In addition, the same parts or corresponding parts in the figures are indicated by the same reference numerals. Agent: Masuo Oiwa (and 2 others) Procedural amendment (voluntary) 1. Indication of case: Patent Application No. 59-224771 2.
Title of the invention Air conditioning/hot water heat pump device 3, Person making the amendment Representative Hitoshi Katayama Department 4, Agent address 2-2-3-5 Marunouchi, Chiyoda-ku, Tokyo Subject of amendment (1) Invention in the description Detailed Explanation Column 6, Contents of Amendment (1) On page 5, lines 8 and 19 of the specification, "Fig. 2" is amended to read "Fig. 1." (2) It says "Figure 5" on page 6, lines 6-7,
Corrected to "Figure 6". (3) On page 10, line 9 of the same page, it says “discharge on one side”.
Correct it to "discharge boat." (4) On page 12, lines 15 and 16, "inverter frequency HzJ" is replaced with "inverter frequency f [HzlJ
and correct it.

Claims (4)

[Claims] (1) In an air conditioning heat pump device in which a refrigerant circuit is configured by connecting a compressor whose capacity can be controlled by an inverter, a four-way air conditioning switching valve, an indoor heat exchanger, an expansion mechanism, and an outdoor heat exchanger in a closed loop, the compression A switching valve is provided between the four-way valve and the four-way valve to switch the refrigerant flow path discharged from the compressor, and a switching valve is connected between the discharge port of the switching valve and both ends of the expansion mechanism through a solenoid valve. The heating coil that heats the water is connected to the refrigerant circuit by the switching valve during the late-night power hours, and the operation is performed at a low frequency from the normal late-night power start time, and the second late-night power is started. A heating/cooling/hot water heat pump device characterized by being provided with a control means with a timer that switches to high frequency operation from the start time of a time period and controls the heating of hot water to a set temperature. (2) The cooling/heating/hot water heat pump device according to claim 1, wherein the frequency of the inverter is set to the lowest frequency during hot water heating operation during normal late-night power hours. (3) The cooling/heating/hot water heat pump device according to claim 1 or 2, wherein the frequency of the inverter during the hot water heating operation during the second midnight time slot is set to the maximum frequency. (4) The air-conditioning/heating/hot water heat pump device according to item 1, wherein the heating operation mode is given top priority during and outside the late-night power hours, and the hot water is heated while the heating operation is suspended.