JPS61246562A - Heat pump with heating tower - 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 [Object of the Invention] "Industrial Application Field" The present invention relates to a heat pump with a heating tower that uses antifreeze and collects heat from the air.

``Conventional technology'' A heat pump with a heating tower that uses antifreeze to collect heat from the air relies on the air as a heat source for heating during the winter. Comparing this with a general-purpose air-source heat pump that also uses air as its heat source, (1) In the air heat exchanger of a general-purpose air-source heat pump, frost and ice build up on the heat exchange surface, reducing the capacity and reducing the required Although inconveniences such as an increase in power arise, a heat pump with a heating tower does not cause such inconveniences.

(λ) General-purpose air heat source heat pumps generally have no choice but to use high-pressure gas refrigerants due to the amount of refrigerant circulating gas, but heat pump refrigerators with heating towers use low-pressure refrigerant Freon R//. It has the advantages of equipment safety, ease of handling, and energy saving.

(3) When using an air source heat pump to route refrigerant piping into a building, there are disadvantages such as loss of refrigerant due to leakage and unsafe conditions due to leakage, but heat pumps with heating towers do not have these concerns.

There are advantages such as

Conventional heat pumps with heating towers that use antifreeze to collect heat from the air have a closed antifreeze circulation system, and when the heating tower is used as a cooling tower in the summer, the antifreeze circulation circuit stores and stores antifreeze. Some devices include an external antifreeze tank and replace the antifreeze outside the antifreeze circulation circuit with the antifreeze circulation circuit when operating the winter heat pump cycle.

"Problems to be Solved by the Invention" However, the concentration of antifreeze circulating in the antifreeze circulation circuit fluctuates, freezing of the antifreeze, overflow of antifreeze to the outside due to an increase in the amount of antifreeze, and the need to replenish the antifreeze due to a decrease in antifreeze. There are concerns that problems such as pump cavitation may occur as the concentration progresses.

However, the theory and demonstration test results of this heat pump with heating tower show that (1) Antifreeze changes its state of concentration, balance, and dilution depending on the outside temperature, humidity, and load conditions.

(j) Changes in antifreeze concentration can be seen as changes in antifreeze level.

It turns out that this is true.

The present invention is based on the above consideration of a heat pump with a heating tower that collects heat from 9 air using antifreeze, and aims to solve the above problems and provide a heat pump whose concentration can be controlled by the amount of antifreeze. That is.

[Structure of the invention]

"Means for solving the problem" The first invention of this section is a heat pump with a heating tower that uses antifreeze and collects heat from the air. This is a heat pump with a heating tower that detects the change in the level of the antifreeze and controls the concentration of the antifreeze based on the amount of the antifreeze.

The third invention of the present application is a heat pump with a heating tower that uses antifreeze and collects heat from the air.
A plurality of antifreeze tanks each having a detection means are provided, and an antifreeze transfer means is provided between one of the plurality of antifreeze tanks in the antifreeze circulation circuit system of the heat pump and other antifreeze tanks outside the system, The heat pump with a heating tower is characterized in that it is provided with a control device that combines the signals indicated by each of the liquid level detection means to control the antifreeze transfer means and the antifreeze concentration/dilution means.

"Operation" The operation of the first invention of the present application is to estimate the concentration of antifreeze detected from the signal of the liquid level detection means of the antifreeze tank. Concentration control is performed by adjusting the amount of liquid in the antifreeze tank based on this antifreeze concentration.

The effect of the second invention of the present application is that when the liquid levels of antifreeze in the antifreeze tank inside the antifreeze circulation circuit and the antifreeze tank outside the circuit are detected, the concentration and dilution state of the antifreeze can be determined based on the combination of the antifreeze liquid levels. do. For example, when the liquid levels of the antifreeze tank inside the antifreeze circulation circuit and the antifreeze tank outside the circuit are both low, the antifreeze is concentrated and the dilution means is operated, and when both are high, the antifreeze is diluted, The concentration means is operated, and when the respective liquid levels are different, the amount of liquid in the antifreeze tanks inside and outside the antifreeze circulation circuit is adjusted by the antifreeze transfer means.

"Embodiments" Examples of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 are flow sheets of a heat pump with a heating tower that uses antifreeze and collects heat from the air via the antifreeze.

The heat pump cycle is the same as that of a heat pump with a heating tower that collects heat through normal antifreeze.

During the summer, the heating tower acts as a cooling tower. That is, during summer cooling, cooling water is stored in the lower water tank 6 of the cooling tower, which is supplied from the water supply pipe 3 through the valve 29. During summer cooling, as shown in Figure 1, valves l, --, ko! , Coro, 31. jJ is closed and bento 3. η~27. The valve t is open (symbol 0 is the valve closed state, symbol 0 is the valve open state). The refrigerant is compressed by the main compressor l, and is sent to the cooling water condenser, and the cooling water inside it is flowing. The water is cooled and condensed by the heat exchanger, reduced in pressure by the expansion valve 3, and sent into the cooler.The water flows through the heat exchanger inside the cooler to cool the cooling water, evaporates, and is sucked into the main compressor. be caught.

Cooling water is sent out from the lower water tank 6 by the pump 3 and sent to the cooling water condenser via the valve λ, which removes heat from the refrigerant and flows through the valve g into the air flow by the fan at the upper part of the lower water tank 6. It is sprayed by a sprayer, cooled by air, and falls into the lower water tank base.

Water for cooling is pumped up from the cold/hot water tank t by a pump 9+, enters the cooler via a valve J, is cooled by a refrigerant, and returns to the cold/hot water tank t via the valve.

Here we will talk about replacing the cooling water and antifreeze in the lower water tank. When the heat pump is used from a summer cooling state to a winter season, first, the valve 33 that allows water to be discharged from the lower water tank 6 is opened to drain the cooling water, and a drain (not shown) in the middle of the piping is removed to drain the cooling water.

Next, in order to manage the concentration and amount of antifreeze, and to pour antifreeze into the lower tank base from the antifreeze tank/l provided for summer storage of antifreeze, close the valve core, t, 31 and 33, and use a valve with a check valve. 31 and operate pump l- to drain the antifreeze tank/
/ is pumped up and poured into the lower water tank 6 from the sprayer via the valve 31. When the liquid level detector lI/ provided in the lower tank base detects the lower limit liquid level, in response to the signal, the liquid level controller 4t operates the pump l- for a limited time and then stops it.

In addition, when switching from the winter state (Figure 1) to summer cooling, when removing antifreeze from the lower water tank 6, use the winter state valve l--g.
,,yi,s Close valve 3/, power control valve 7
Lower water tank 1 is opened by opening 1I and operating pump 5.
of antifreeze can be transferred to the antifreeze tank //.

During winter heating, add antifreeze to the lower water tank 6 as described above.
Close the valve J, Koda, 2, 21, and the valve L.

Here, here! , Co &, 3/, Leave J Co open. During winter heating, as shown in FIG. 2, the refrigerant is compressed by the main compressor 1, passes through an inactive cooling water condenser, and is sucked into the booster compressor. The refrigerant compressed by the booster compressor is sent to the hot water condenser, heats the water flowing through the heat exchanger inside the hot water condenser/4, is depressurized by the expansion valve TRI, and returns to the cooling water condenser.

The refrigerant liquid in the cooling water condenser is further reduced in pressure by the expansion valve 3 and flows back to the cooler, cools the antifreeze flowing through the cooler, evaporates itself, and is sucked into the main compressor 1 again.

Water sent from the cold/hot water tank S by the pump D enters the hot water condenser/+1 via valve 1, is heated, and returns to the cold/hot water tank t via valve 1.

The antifreeze in the lower water tank 6 during heating is pumped! It is sucked in and sent out! The heat exchanger in the coolada removes heat from the refrigerant and cools the valve.
The water is sprayed from the sprayer via the water tank 6, heated by air, and stored in the lower water tank 6. In this way, the antifreeze circulation circuit that performs the heat pump cycle is configured. The above-mentioned heat pump is a heat pump with a heating tower that collects heat using a known antifreeze.

As mentioned above, the heat pump with heating tower has a lower water tank 6 and a pump! , Valve 3, Coolada as an outside air side heat exchanger using antifreeze as a medium, Valve-6. Equipped with a sprayer and piping to connect them.

As is clear from the above description, in addition to the lower water tank 6 used as an antifreeze tank during the heat pump cycle, an antifreeze tank // is arranged outside the antifreeze circulation circuit that performs the heat pump cycle. Although this antifreeze tank// and the antifreeze circulation circuit share some piping, the piping for sending and receiving antifreeze between the antifreeze tank ii and the lower water tank 6 may be independent from the antifreeze circulation circuit of the heat pump cycle. .

The lower water tank 6 is equipped with a liquid level detector tIl as a means for detecting the amount of antifreeze in the antifreeze circulation circuit of the heat pump cycle. The tank is equipped with a sensor that detects the liquid level and emits signals indicating the upper limit liquid level and the lower limit liquid level, respectively.

Based on the signal detected by the antifreeze amount detection means, the control device controls the amount of antifreeze passing through the antifreeze sending/receiving pipe to keep the amount of antifreeze in the antifreeze circulation circuit constant. Pump after receiving the signal from the machine! ,
It consists of a liquid level controller GUKO which controls the power control valve 3II.

The antifreeze in the antifreeze circulation circuit of a heat pump cycle has a light load, and when the outside temperature is high and the humidity is low, water evaporates and concentrates, and the amount of antifreeze decreases.When the load is large, the outside temperature is low, and the humidity is high, the amount of antifreeze is reduced. The amount of antifreeze increases as it absorbs moisture from the air and its concentration decreases. This increase or decrease in the amount of antifreeze appears as a change in the liquid level in the lower tank base.

During operation of the heat pump cycle, the pump saw is normally stopped and power control valve J4I is closed. Now, when the liquid level of the antifreeze in the lower water tank 6 is lowered due to concentration and reaches the lower limit liquid level, the liquid level detector 6/ sends a signal detecting the lower limit liquid level to the liquid level controller 11. Liquid level controller 4I is pump l
- is operated to pump up antifreeze from the antifreeze tank // and pour the antifreeze into the lower water tank base from the sprayer via valve 31. When the liquid level in the lower water tank 6 rises, the signal indicating the lower limit liquid level is no longer output from the liquid level detector l/ when the liquid level is slightly higher than the lower limit water level by the offset amount of the liquid level detector da/. In response to the disappearance of the signal, the liquid level controller DAKO operates the pump saw for a limited time, and stops the pump 7.2 so that the liquid level in the lower water tank becomes an intermediate level between the upper and lower limit liquid levels.

During the operation of the heat pump cycle, the liquid level of the antifreeze liquid in the lower water tank 6 rises due to water absorption and dilution to the upper limit liquid level (when this happens, the liquid level detector sends a signal detecting the upper limit liquid level to the liquid level controller Goo. The position controller 41J opens the three power control valves,
Antifreeze circulation circuit pump! The antifreeze liquid is released from the discharge side of the valve and the piping between the two valves and the third valve and the power control valve j4' to the antifreeze tank //. In this way, the liquid level in the lower water tank base decreases, and when the signal from the liquid level detector 41/ disappears at a position lower than the upper limit liquid level by the offset amount of the liquid level detector lIl, the liquid level decreases due to the disappearance of the signal. The controller lI opens the power control valve 3da for a limited time and closes the power control valve j4t at an intermediate liquid level between the upper and lower limit liquid levels of the lower water tank base.

The antifreeze tank// serves as an antifreeze storage tank in the summer, but has a capacity that is sufficiently larger than the antifreeze capacity of the antifreeze circulation circuit of the heat pump cycle to control the liquid level in the lower water tank base in the winter.

As a result of such liquid level control in the lower water tank base, when the liquid level in the lower water tank base reaches the lower limit liquid level, in the concentrated state, it is diluted by the antifreeze solution in the antifreeze tank // with a lower concentration, and the liquid level in the lower water tank base increases. When the upper limit liquid level is reached and the antifreeze is in a diluted state, the concentration is increased by mixing the antifreeze solution of higher concentration in the antifreeze tank/l, and the concentration is adjusted.

In the above explanation, the antifreeze tank outside the antifreeze circulation circuit is an antifreeze tank that stores antifreeze during summer cooling. However, in the above embodiment, there is no limit to the antifreeze tank placed outside the antifreeze circulation circuit, and during summer cooling In addition to the antifreeze tank/l that stores antifreeze solution, antifreeze solution may be delivered and received in an independent antifreeze tank and a lower water tank.

FIG. 3 is a flow sheet of another embodiment.

In this embodiment, in addition to the previous embodiment, the antifreeze tank /1 is also provided with a detector 173 for the liquid level in the antifreeze tank // and a liquid level controller III that receives the signal from the liquid level detector G3.

The liquid level in the lower water tank base is controlled in the same way as in the previous embodiment, so that the liquid level fluctuates between the upper limit liquid level and the lower limit liquid level in the lower water tank base, and an almost constant amount of antifreeze is supplied to the antifreeze circulation circuit of the heat pump. is flowing.

If the operation continues in this manner, the load is large, the outside temperature is low, and the humidity remains high, the liquid level in the lower water tank 6 continues to rise, and the diluted liquid enters the antifreeze tank ii through the power control valve 74I. The liquid level in the antifreeze tank // rises due to the antifreeze. If this condition continues, the antifreeze in the antifreeze circulation circuit of the heat pump cycle will be significantly diluted.

Conversely, if the load is small, the outside temperature is high, and the humidity remains low, the liquid level in the lower water tank 6 continues to fall, and the antifreeze in the antifreeze tank // is replenished to the lower water tank 6i through the pump saw. If this situation is repeated, the antifreeze tank l/
The amount of a freezing point depressant such as ethylene glycol in the antifreeze increases in the antifreeze circulation circuit of the heat pump cycle, and as the concentration of the antifreeze progresses, the liquid level in the antifreeze tank 1/1 decreases.

The upper and lower limits of the liquid level in the antifreeze tank // are determined by the liquid level detector 4 (j
Detected by , the liquid level controller TATA sets the power control valve 3D to a time limit and sets the pump saw to a time limit operation. Antifreeze is sent from the antifreeze tank// to the lower water tank 6 by the operation of the pump lλ, and the antifreeze in the lower water tank is circulated by the pump 3 to the antifreeze tank/I via the valve 3 and the power control valve 3'l. The antifreeze in the antifreeze circulation circuit of the heat pump cycle is mixed with the antifreeze in the antifreeze tank sent by the pump in the piping between the valve roller and the sprayer 7 and circulated. In this way, when the pump saw stops operating for a limited time and the power control valve JII closes for a limited time, the antifreeze in the antifreeze circulation circuit of the heat pump cycle including the lower water tank 6 and the antifreeze concentration in the antifreeze tank/l are averaged and adjusted, and the heat pump cycle Diluted antifreeze in the antifreeze circulation circuit becomes thicker, and concentrated antifreeze is diluted.

If such a situation is repeated and the liquid level significantly rises and falls beyond the upper and lower limits of the liquid level detected by the liquid level detector II3, the antifreeze may overflow from the antifreeze tank/l or the amount stored may become too small. Antifreeze becomes extremely diluted or concentrated.

Therefore, the liquid level detector lIJ is provided with overflow liquid level and empty liquid level detection ends outside the upper and lower limit liquid levels,
Liquid level detector lI from signal l indicating overflow liquid level
3 operates, for example, an antifreeze concentration device/6 by heating to concentrate the antifreeze, and in response to a signal indicating an empty water level, water is supplied to the lower water tank base via a valve 29 through a water supply device (not shown), or to the antifreeze tank//. Supply water.

A situation like this example is an extreme case, and although the possibility of reaching this state is small, the range of concentration control is much wider.

〔Effect of the invention〕

The first invention of the present application is a heat pump with a heating tower that uses antifreeze and collects heat from the air, in which a liquid level detection means is provided in the antifreeze tank, and changes in the concentration of the antifreeze are detected by changes in the liquid level of the antifreeze. Since the heat pump is equipped with a heating tower and is characterized by controlling the concentration of antifreeze by the amount of antifreeze, it is possible to automatically control the concentration of antifreeze within a usable range, eliminating the need for manual concentration control, which was previously the case. This will greatly contribute to labor savings and the practical application of heat pumps with heating towers that collect heat using antifreeze.

The first invention of the present application is a heat pump with a heating tower that uses antifreeze and collects heat from the air, in which a plurality of antifreeze tanks equipped with liquid level and detection means are provided, and one of the antifreeze tanks includes an antifreeze circulation port of the heat pump. An antifreeze transfer means is provided between one antifreeze tank in the system and other antifreeze tanks outside the system, and the signals indicated by the respective liquid level detection means are combined to perform the antifreeze transfer means and the concentration/dilution of the antifreeze. Since the heat pump with a heating tower is characterized in that it is equipped with a control device for controlling the means, in addition to the effects of the first invention, the concentration of the antifreeze itself can be controlled, so that the heat pump can be used in a wider range of outside air conditions. It becomes possible to drive.

[Brief explanation of the drawing]

FIGS. 1 and 2 are flow sheets of embodiments of the present invention, respectively.
FIG. 3 is a flow sheet of another embodiment. ／・・Main compressor ・・Cooling water condenser 3-・Expansion valve tI-・Cooler 5・Lot pump 6・6 lower water tank ? −
- Spreader t-6 cold/hot water tank de-pump llI+1
1 Antifreeze tank 1.Pump /J@-booster compressor 14I.Fist hot water condenser 1!・・Expansion valve /M@
-Antifreeze concentrator CO/~-DE-Valve 31~33...
Valve J4t... Power control valve 3ri... Water supply pipe 4t/4.
Liquid level detector Hiroko・kai Liquid level controller 4tJ...Liquid level detector 4L4t...Liquid level controller.

Claims (1)

[Scope of Claims] 1. In a heat pump with a heating tower that uses antifreeze and collects heat from the air, a liquid level detection means is provided in the antifreeze tank, and changes in the concentration of the antifreeze are detected by changes in the liquid level of the antifreeze. A heat pump with a heating tower, characterized in that the concentration of antifreeze is controlled by the amount of antifreeze. 2. Claim 1, characterized in that the antifreeze storage tank whose liquid level is to be detected is a lower water tank of a heating tower.
Heat pump with heating tower as described in section. 3. In a heat pump with a heating tower that uses antifreeze and collects heat from the air, a plurality of antifreeze tanks equipped with liquid level detection means are provided, and one of the antifreeze tanks is installed in the antifreeze circulation circuit system of the heat pump. one antifreeze tank,
A means for transferring antifreeze is provided between other antifreeze tanks outside the system,
A heat pump with a heating tower, characterized in that a control device is provided for controlling the antifreeze fluid delivery/reception means and the antifreeze concentration/dilution means by combining the signals indicated by the liquid level detection means.