KR20050028478A - A system for warm water-production of heat-pump type - Google Patents

Abstract

A heat pump type hot water generating system is provided to raise temperature of hot water up to approximately 70°C or higher in a short time while preventing frosting of various pipes and parts between a compressor and an evaporator heat exchanger. A heat pump type hot water generating system includes a temperature keeping unit for keeping temperature of heat exchange medium flowing in an evaporator heat exchanger(400) uniformly. The temperature keeping unit includes a fluid path formed in the evaporator heat exchanger separately from a heat exchange medium path. A heat exchange element(500) carries out heat exchange between cold water supplied from the outside and heat exchange medium passing through a condensing heat exchanger(200). An introducing pipe(501) connects an inlet part of the fluid path to an outlet part of the heat exchange element for introducing hot water of a predetermined temperature discharged from the heat exchange element into the evaporator heat exchanger. A return pipe(502) connects an outlet part of the fluid path to an inlet part of the heat exchange element for the return of the hot water discharged from the evaporator heat exchanger to the heat exchange element. A pump(503) is mounted either the inlet pipe or the return pipe for circulating the hot water. The heat exchange medium discharged from the heat exchange element is transferred to a heat exchange medium path via the inlet part of the evaporator heat exchanger through pipes(504).

Description

Heat pump type hot water generation system {A system for warm water-production of heat-pump type}

The present invention relates to a heat pump type hot water generating system, and more particularly, there is no problem in that the temperature of the hot water is about 70 ° C. or higher, and the temperature of the hot water can be increased to about 70 ° C. or more in a short time, so that the overall energy In terms of efficiency, there is a great advantage, and in order to increase the temperature of hot water by about 70 ° C. or more, if the compressor 1 is operated for a long time, the temperature of the heat exchange medium via the evaporation heat exchanger gradually decreases, so that the piping between the evaporation heat exchanger and the compressor The freezing phenomenon of frost on various parts can be basically eliminated, and since the hot water temperature is below 70 ℃, there is no need to install a separate auxiliary heater. It relates to a hot water generation system.

As an example of a conventional heat pump type hot and cold water supply apparatus, there is a patent application No. 2002-6429 which was selected by the applicant on February 5, 2002.

As shown in FIG. 1, the technique of FIG. 1 includes a compressor 1 for compressing the supplied refrigerant into a gas refrigerant, and an external blower blown by the blower fan 4 with the high temperature and high pressure gas refrigerant discharged from the compressor 1. A first condenser (3) for liquefying a medium-temperature high-pressure liquid refrigerant with air, an expansion valve (5) for reducing the liquefied liquid refrigerant discharged from the condenser to a low-temperature low pressure to form a liquid, and the expansion valve (5) It consists of an evaporator (7) to take the heat from the fluid supplied to the liquid refrigerant decompressed to a low temperature low pressure state through the evaporator to change to a gas phase to constitute a basic refrigeration cycle.

Next, a second condenser 30 is installed on the discharge path of the compressor 1 to condense the gas gas of high temperature and high pressure discharged from the compressor 1 by the fluid supplied and to supply the warm fluid. On the second condenser 30 side, a first supply pump 21 is installed to supply a fluid condensing to the second condenser 30, and on the evaporator 7 side, the evaporator 7 evaporates. A second supply pump 23 for supplying a fluid to be performed is provided.

The second condenser 30 is composed of first, second and third heat exchangers 31, 33, and 35 so as to supply a low temperature, medium temperature, and high temperature fluid.

An oil separator 9 for separating oil contained in the refrigerant discharged from the compressor 1 is installed on the discharge path of the compressor 1, and on the refrigerant inlet path of the compressor 1 to the compressor 1. A liquid refrigerant heat exchanger (11) is installed to maintain the temperature and pressure of the introduced refrigerant at a predetermined value so that the supercooled refrigerant flows into the compressor (1) to reduce the impact on the compressor (1) due to the pressure difference. do.

In addition, a dryer 13 is installed on the discharge path of the second condenser 30 to remove impurities and moisture included in the refrigerant discharged from the second condenser 30, and the input / output ends of the dryer 13 are provided. Each of the valves 15a and 15b is installed to block the flow path when the dryer 13 is replaced.

On the other hand, a coolant amount controller 17 is installed on the output end side of the dryer 13 to adjust the flow rate of the coolant, and the evaporator 7 detects an abnormal temperature by detecting a temperature of the evaporator 7. A temperature sensor 19 is provided to stop the system.

In the drawing, the solid line indicates a refrigerant circulation line for circulating the refrigerant by connecting each of the above-mentioned refrigeration parts, and the dashed-dotted line indicates a fluid circulation line through which the fluid to be switched to the warm fluid and the cooling fluid circulates. 25a, 25b and 25c represent first, second and third solenoid valves which electrically open and close each refrigerant circulation line.

However, the prior art as described above has the following problems.

First, since the prior art has a system for discharging both cold water and hot water in parallel, there is a problem in that the temperature of the hot water cannot be increased to a high temperature of about 70 ° C or higher.

Second, since the compressor 1 must be operated for a long time in order to increase the temperature of the hot water at about 70 ° C. or more, there is a problem in that it is inefficient in terms of energy efficiency as well as giving a large crowd to the compressor 1.

Third, in order to increase the temperature of the hot water by about 70 ° C. or more, if the compressor 1 is operated for a long time, the temperature between the evaporator 7 and the compressor 1 is gradually decreased because the temperature of the heat exchange medium via the evaporator 7 gradually decreases. And there was a problem that the frost phenomenon occurs in the various parts.

Fourth, since the temperature of the hot water is a low temperature of less than 70 ℃, there is also an inefficient problem in terms of energy efficiency, such as to install a separate auxiliary heater operated by electricity in order to increase the temperature of the hot water.

Fifth, the prior art has a problem that the compressor does not operate because hot gas occurs when the inlet temperature of the cold water is more than 40 degrees.

The present invention was devised to solve the above problems, and there is no problem to make the temperature of the hot water higher than about 70 ° C., and the temperature of the hot water can be increased to about 70 ° C. or more in a short time, thereby improving the overall energy efficiency. In order to increase the temperature of the hot water, the temperature of the heat exchange medium via the evaporation heat exchanger gradually decreases when the compressor 1 is operated for a long time to increase the temperature of the hot water by about 70 ° C. or more. Freezing of the frost on the field can be essentially eliminated, and since the hot water temperature is below 70 ° C, there is no need to install a separate auxiliary heater. It is an object to provide a system.

The present invention for achieving the above object, including a compressor installed in order to flow through the heat exchange medium through a line, a condensation heat exchanger, expansion valve and evaporation heat exchanger, and condensing the cold water supplied from the outside A heat pump type hot water generating system for passing high temperature water by heat exchange with the heat exchange medium by passing through a fluid passage formed independently of the heat exchange medium passage in the heat exchanger, the temperature of the heat exchange medium flowing through the evaporation heat exchanger. It characterized in that it comprises a temperature maintaining means for maintaining a constant state.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of a heat pump type hot water generator according to the present invention will be described in detail.

2 is a view showing a heat pump type hot water generator according to the present invention.

The present invention includes a compressor (100), a condensation heat exchanger (200), an expansion valve (300) and an evaporation heat exchanger (400), which are sequentially connected to allow a heat exchange medium to flow through a line, and are supplied from the outside. In the heat pump type hot water generation system for passing the cold water to the fluid passage passage 202 formed independently of the heat exchange medium passage passage 201 in the condensation heat exchanger 200 so that the high temperature water by heat exchange with the heat exchange medium. The temperature maintaining means for maintaining the temperature of the heat exchange medium flowing in the evaporation heat exchanger 400 in a constant state is provided.

The temperature maintaining means includes a fluid passage 402 formed separately from the heat exchange medium passage 401 in the evaporation heat exchanger 400, a cold water supplied from the outside, and heat exchange passing through the condensation heat exchanger 200. Heat exchange means 500 for heat exchange with the medium to be a hot water of a predetermined temperature, and the fluid passage 402 so that the hot water discharged from the heat exchange means 500 is introduced into the evaporation heat exchanger 400. An inlet pipe 501 connecting the inlet side of the inlet side and the outlet side of the heat exchange unit 500, and the hot water of the constant temperature discharged from the evaporation heat exchanger 400 to return to the heat exchange unit 500. A return pipe 502 connecting the discharge side of the nozzle 402 and the inflow side of the heat exchange means 500 and one of the inlet pipe 501 and the return pipe 502 to circulate the hot water to circulate it. It consists of a pump 503, the thermal bridge The heat exchange medium discharged from the return means 500 is connected to the heat exchange medium passage path 401 through an inlet side of the evaporative heat exchanger 400 via a pipe 504.

In the configuration, the heat exchange means 500 includes a water tank 510 in which a part of the cold water supplied from the outside is stored, and an inflow port 510a and a discharge port 510b are formed, and the inflow port 500a is It is connected to the discharge side of the condensation heat exchanger 200 and the line 222, the discharge port 550b is connected to the inlet side of the expansion valve 300 and the pipe 504 in the tank 510 It consists of a recondensation heat exchanger 520 is built-in.

In addition, a fluid passageway 402 is formed separately from the flow path 401 of the heat exchange medium in the evaporation heat exchanger 400, so that the inlet 402a side of the fluid passageway 402 is the water tank 510. Is connected to the discharge port 501b and the inlet pipe 501, and the outlet 402b side of the fluid passage 402 is connected to the inlet port 510a and the return pipe 502 of the water tank 510. It is constructed by connecting.

In the configuration, the condensation heat exchanger 200 may include a first condensation heat exchanger 210 and a second condensation heat exchanger in which the heat exchange medium discharged from the compressor 100 is branched in and discharged through the branch opening 100, respectively. And a heat exchange medium discharged from the first condensation heat exchanger 210 is connected to an inlet side of the evaporation heat exchanger 400 through a pipe 504 and the second condensation heat exchanger. The heat exchange medium discharged from the 220 is connected to the heat exchange medium inlet port 500a of the heat exchange means 500, and the cold water flowing into the first condensation heat exchanger 210 is branched through the branch 250. After being discharged through the fluid passage 202 while being pumped by the pump 251, the liquid is introduced into the fluid passage 202 in the second condensation heat exchanger 220 and then passed through the pipe 221. Is configured to be discharged in the hot water state to the outside, the other branched through the branch 250 Cooling water is adapted to be introduced to the upper side of the water bath tank 510.

Here, the second condensation heat exchanger 220 is installed in two or more connected in parallel.

In addition, a part of the hot water discharged from the first condensation heat exchanger 210 and introduced into the second condensation heat exchanger 220 is branched through the branch opening 240, and then, the pipe 241 is opened through the pipe 241. Return to the branch 250 is configured to join with the cold water flowing into the first condensation heat exchanger (210).

The water level sensing means 540 is installed on the upper side of the water tank 510 so that the coolant flowing through the branch 250 is filled by a predetermined amount.

Referring to the operation of the present invention configured as described above are as follows.

The operation of the present invention will be described in three parts: the flow process of the heat exchange medium, the flow of cold water, and the heat exchange process of the heat exchange medium and cold water.

First, the flow process of the heat exchange medium will be described first.

When the hot water generator of the present invention is first started, the cycle starts to operate as the heat exchange medium becomes a gas of high temperature and high pressure by compression in the compressor 100.

The heat exchange medium coming out of the compressor 10 passes through the oil separator 101 and oil is separated and only the working fluid flows.

The high temperature and high pressure heat exchange medium is bifurcated through the separator 110 and supplied to the first condensation heat exchanger 210 and the second condensation heat exchanger 220.

After the heat exchange medium introduced into the first condensation heat exchanger 210 flows along the pipe 504 through the heat exchange medium passage path 201 and expands through the expansion valve 300 to be easily evaporated, After passing through the heat exchange medium passage path 401 of the evaporation heat exchanger 400, the heat exchange with the surroundings causes the gas to be low temperature and low pressure, and then returns to the compressor 100.

On the other hand, a portion of the heat exchange medium branched from the branch port 110 passes through the heat exchange medium passage path 201 of the second condensation heat exchanger 220, the ash constituting the heat exchange means 500 along the pipe 222. Pass through the condensation heat exchanger 520, the heat exchange medium passing through the recondensation heat exchanger 520 is introduced to the expansion valve 300 through the pipe 504.

So far, the flow process of the heat exchange medium has been described.

Hereinafter, the flow of cold water will be described.

Cold water flows from the cold water source by pumping of the pump 251, and then, through the outlet 250, a part of the cold water flows into the first condensation heat exchanger 210, passes through the fluid passage 202, and then again the first condensation heat exchanger. After being discharged to the outside of the 210, it flows along the pipe 505 and flows into the second condensation heat exchanger 220.

The cold water introduced into the second condensation heat exchanger 220 is discharged from the second condensation heat exchanger 220 after passing through the fluid passage 202, and then discharged to the outside along the pipe 221 to temporarily store the fluid. The two are discharged via the hot water header 221a.

On the other hand, the cold water moving along the pipe 505 is partly diverged by the branch opening 240 and then bypassed again to the branch opening 250 to join the cold water flowing from the cold water supply source.

Then, the cold water flows from the cold water source by the pumping of the pump 251, and the remainder of the cold water branched through the branch 250 is flowed along the pipe 506, and then the upper side of the water tank 510 Through it.

Here, since the water level detecting means 540 is provided on the upper side of the tank 510, the cooling water branched through the branch 250 is filled in the tank 510 by a predetermined amount.

Thereafter, the cold water filled in the tank tank 510 by a predetermined amount is discharged through the outlet port 510b by the pumping of the pump 503 and then the inlet 402a of the evaporative heat exchanger 400 along the inlet pipe 501. After passing through the fluid passage 402 formed in the evaporation heat exchanger 400, and discharged through the outlet 402b, flows along the return pipe 502, the inflow of the tank 510 The water is introduced into the tank 510 through the port 510a.

That is, cold water is continuously circulated between the water tank 510 and the evaporative heat exchanger 400 by pumping the pump 503.

So far, the flow of cold water has been described.

Hereinafter, a process of heat exchange between cold water and a heat exchange medium will be described.

First, in the first condensation heat exchanger 210, the heat exchange medium having a high temperature and high pressure passing through the heat exchange medium passage path 201 and the cold water passing through the fluid passage path 202 may be used. Heat exchange inside.

The cold water heat-exchanged in this manner is elevated in temperature by a predetermined value or more, and is heat-exchanged with a heat exchange medium having a high temperature and high pressure in the second condensation heat exchanger 220 to be in a hot water state of about 70 ° C (degrees) along the pipe 221. Discharged.

The hot water discharged is used for bathrooms, boilers, and the like.

The hot water discharged from the first condensation heat exchanger 210 is partially branched from the branch opening 240 and bypassed to the branch opening 250.

On the other hand, the cold water branched from the branch 250, the cold water contained in the tank tank 510 via the pipe 506 of the high temperature and high pressure supplied from the recondensation heat exchanger 520 to the second condensation heat exchanger 220. Heat exchange with the heat exchange medium is changed to the state of hot water at a constant temperature.

In addition, the heat exchange medium introduced into the recondensation heat exchanger 520 is recondensed.

The hot water in the water tank 510 is returned to the water tank 510 as long as the water is circulated in the evaporation heat exchanger 400 by pumping the pump 503, and in this process, the heat exchange medium in the evaporation heat exchanger 400. Heat exchange to prevent the temperature of the heat exchange medium from lowering below a certain value.

Therefore, it is possible to solve the conventional defect that the freezing phenomenon such as frost occurred on the main surfaces of the evaporative heat exchanger 400 and the compressor 100.

More specifically, the temperature of the heat exchange medium in the evaporation heat exchanger 400 can be kept constant.

Here, reference numerals 600, 610, and 620 are pressure gauges, high and low pressure cutoff switches, and high pressure cutoff switches, 630 is an observation window for observing the state of the heat exchange medium, 640 is a dryer with a filter, and 650 is a flow path. Solenoid valve to shut off.

In addition, 660 is a liquid separator for separating the liquid component in the heat exchange medium.

The above described components are components that are commonly used, and thus detailed description thereof will be omitted.

Therefore, the present invention can solve the problem that the compressor does not operate because hot gas does not occur when the inlet temperature of the cold water is 40 degrees or more.

In addition, the first condenser 3 having the blower fan 4 used in the prior art is not required, so that manufacturing costs and the like can be reduced.

As described above, according to the heat pump type hot water generating system according to the present invention, there is no problem in that the temperature of the hot water is about 70 ° C. or more, and the temperature of the hot water can be increased to about 70 ° C. or more in a short time. There is a big advantage in terms of energy efficiency.

In order to increase the temperature of the hot water by about 70 ° C. or more, if the compressor 1 is operated for a long time, the temperature of the heat exchange medium via the evaporation heat exchanger gradually decreases, causing frost to the piping and various components between the evaporation heat exchanger and the compressor. Stuck freezing can be essentially eliminated.

And, since the temperature of the hot water is a high temperature of less than 70 ℃ do not need to install a separate auxiliary heater has a great advantage in terms of energy efficiency.

1 shows a prior art.

2 is a view showing a heat pump type hot water generating system according to the present invention.

<Description of the symbols for the main parts of the drawings>

100: compressor

200: condensation heat exchanger

201: passage through heat exchange medium

202: fluid passage

210: first condensation heat exchanger

220: second condensation heat exchanger

300: expansion valve

400: evaporative heat exchanger

510: tank

520: Recondensing Heat Exchanger

Claims (7)

Compressor 100, the condensation heat exchanger 200, the expansion valve 300 and the evaporation heat exchanger 400 is installed in order to connect the heat exchange medium to flow through the line, and the cold water supplied from the outside In the heat pump type hot water generation system to pass through the fluid passage (202) formed independently of the heat exchange medium passage (201) in the condensation heat exchanger 200 to the high temperature water by heat exchange with the heat exchange medium, Heat pump type hot water generating system characterized in that it comprises a temperature maintaining means for maintaining the temperature of the heat exchange medium flowing in the evaporation heat exchanger 400 in a constant state. The method of claim 1, The temperature holding means, A fluid passage 402 formed separately from the heat exchange medium passage 401 in the evaporation heat exchanger 400; Heat exchange means (500) for exchanging heat with cold water supplied from the outside and the heat exchange medium passing through the condensation heat exchanger (200) to obtain hot water at a predetermined temperature; Inlet pipe connecting the inlet side of the fluid passage 402 and the outlet side of the heat exchange means 500 so that the hot water of the constant temperature discharged from the heat exchange means 500 is introduced into the evaporative heat exchanger 400 ( 501); Return piping for connecting the discharge side of the fluid passage (402) and the inlet side of the heat exchange means 500 so that the hot water of a constant temperature discharged from the evaporation heat exchanger 400 is returned to the heat exchange means (500) ( 502); The pump 503 is installed in any one of the inlet pipe 501 and the return pipe 502 to pump and circulate the hot water, The heat exchange medium discharged from the heat exchange means 500 is connected to the heat exchange medium passage path 401 through the inlet side of the evaporative heat exchanger 400 via a pipe 504. Hot water generation system. The method of claim 2 or 3, The heat exchange means 500, A portion of the cold water supplied from the outside is stored, and a tank tank 510 having an inlet port 510a and an outlet port 510b; The inlet port 500a is connected to the outlet side of the condensation heat exchanger 200 and the line 222, and the outlet port 550b is connected to the inlet side of the expansion valve 300 via a pipe 504. Consists of a recondensation heat exchanger 520 is installed in the tank 510, A fluid passageway 402 is formed separately from the flow path 401 of the heat exchange medium in the evaporation heat exchanger 400, so that the inlet 402a side of the fluid passageway 402 discharges the tank 510. A port 501b is connected to the inlet pipe 501, and the outlet 402b side of the fluid passage 402 is connected to the inlet port 510a of the water tank 510 by a return pipe 502. Heat pump type hot water generating system characterized in that the. The method of claim 3, wherein The condensation heat exchanger 200 The heat exchange medium discharged from the compressor (100) is composed of a first condensation heat exchanger (210) and a second condensation heat exchanger (220), each branched inlet and discharged through a branch opening (100), The heat exchange medium discharged from the first condensation heat exchanger 210 is connected to the inlet side of the evaporation heat exchanger 400 through a pipe 504. The heat exchange medium discharged from the second condensation heat exchanger 220 is connected to the heat exchange medium inlet port 500a of the heat exchange means 500, The cold water flowing into the first condensation heat exchanger 210 is discharged through the fluid passage 202 in a state of being branched through the branch 250 and pumped by the pump 251, and then the second condensation. It is configured to be introduced into the fluid passage 202 in the heat exchanger 220 and then discharged to the outside through the pipe 221 in a hot water state, The remaining cooling water branched through the branch 250 is introduced into the upper side of the tank tank 510, the heat pump type hot water generating system. The method of claim 4, wherein The second condensation heat exchanger (220) is a heat pump type hot water generation system, characterized in that two or more connected in parallel. The method of claim 4, wherein A part of the hot water discharged from the first condensation heat exchanger 210 and introduced into the second condensation heat exchanger 220 is branched through the branch opening 240, and then branched through the pipe 241. Heat pump type hot water generation system, characterized in that configured to be returned to the 250 and joined with the cold water flowing into the first condensation heat exchanger (210). The method of claim 4, wherein Heat pump type hot water generation system, characterized in that the water level sensing means (540) is installed on the upper side of the water tank (510) so that the cooling water branched through the branch (250) is filled by a predetermined amount.