JPH07139847A - High/low temperature heat pump system - Google Patents

Abstract

PURPOSE:To provide a heat pump system that covers temperature ranges of high, middle, low three kinds, and that ensures a vapor at 110 to 115 deg.C for heating, cooking, and sterilization, hot water at about 60 deg.C enough to effect commom hot water supply, and cooling at about --10C to +10C. CONSTITUTION:There is provided a passage penetrating a heating fluid in a condenser 2 of a freezing cycle that includes a low temperature part for cooling or ice making, a simultaneous operation type low temperature side heat pump B serving as a middle temperature part that produces hot water, a hot water storage tank 10 for storing hot water from the heat pump B, a compressor 1, the condenser 2, a refrigerant throttle valve 3, and an evaporator 4. A high temperature side heat pump A is connected in which in the evaporator 4 heat is absorbed from hot water in the hot water storage tank 10 and in the condenser 2 water vapor is produced, whereby a high/low temperature heat pump system is provided which has low, middle, and high three temperature ranges and in which a difference between the upper limit temperature and the lower limit temperature of these three temperature ranges is 10 deg.C or higher.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump system which utilizes two heat pumps and can cope with three kinds of operating temperature zones of high temperature, medium temperature and low temperature.

[0002]

2. Description of the Related Art Conventionally, a refrigerator or an air conditioner is used for cooling or cooling, and a hot water boiler is used to supply hot water.
It was heated and sterilized by a steam boiler.

However, in recent years, along with the use of heat pumps, cooling and heating have been carried out in various industrial fields, and cooling and heating have been carried out in the field of air conditioning using heat pumps, and hot water has been supplied instead of heating and heating.

However, the normal heat pump has a low condensation temperature of about 40 ° C. in the condenser, and heating, heating and hot water supply are 60 ° C.
Hereinafter, it is usually used as hot water at 40 to 60 ° C.

On the other hand, as a special example, there is a heat pump for obtaining low temperature and high temperature hot water of 100 ° C. or higher by a binary refrigerant system, but this heat pump cannot obtain an intermediate temperature. There is also a heat pump type steam generator, but it cannot obtain medium temperature (hot water supply) or low temperature (cooling, cooling).

[0006]

In view of the above-mentioned actual situation, the present inventors have paid attention to the current state of heat pumps, and
It has been a subject to obtain an apparatus capable of generating low temperature together.

That is, normally, when the temperature difference between the heat absorption temperature (low temperature heat source) and the heat radiation temperature (high temperature heat source) of the heat pump exceeds about 60 ° C., the design pressure is limited and the efficiency is lowered due to the high compression ratio.

Therefore, in order to obtain a device capable of generating high, medium and low temperatures, a single heat pump cannot be used, and a system incorporating a heat pump type steam generator is required. , Middle and low temperature range, covering 110 ~ 115 ℃ steam for heating, cooking, sterilization, etc., 60 ℃ hot water for general hot water supply, -10 ~ + 10 ℃ It is an object of the present invention to provide a heat pump system capable of cooling the above.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a high / low temperature heat pump system having a simultaneous operation type which is in charge of a low temperature part for cooling or ice making and a middle temperature part for producing hot water. A low temperature side heat pump, a hot water storage tank for storing hot water of the heat pump, and a condenser for a refrigeration cycle including a compressor, a condenser, a refrigerant throttle valve and an evaporator are provided with a heated fluid flow path, and hot water is stored in the evaporator. A high temperature side heat pump that absorbs heat from the warm water of the tank and generates steam in the condenser is connected to each other, has three operating temperature zones of low temperature, medium temperature and high temperature, and has an upper limit temperature of these three temperature zones. And the lower limit temperature is 1
The temperature was set to 00 ° C or higher.

In the above case, it is effective to make the heat absorption amount of the high temperature side heat pump smaller than the heat radiation amount of the low temperature side heat pump.

[0011]

According to the above system of the present invention, the low temperature side heat pump is operated to cool or make ice in the low temperature portion, while hot water is stored in the hot water storage tank from the high temperature side (medium temperature). And while the hot water generated by the low temperature side heat pump is sent from the hot water storage tank to the evaporator of the high temperature side heat pump via the circulation pump and circulated, while the water is made to flow through the condenser from the water supply source through the circulation pump, the flowed water is It is taken out as water vapor.

Thus, without using a combustor, steam for heating, cooking, sterilization, hot water for general hot water supply, cold water of -10 to + 10 ° C for cooling or ice are all used in the present invention. Can be obtained with a heat pump system.

[0013]

Embodiments of the system of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an example of the system of the present invention. A is a high temperature side heat pump (steam generator), B is a low temperature side heat pump (main heat source machine), and 10 is a hot water storage tank. Is provided with a pipe for circulating a refrigerant such as brine through a circulation pump 18 for cooling or ice making in the cooling load or the ice heat storage tank 7 to evaporate the low temperature side heat pump B. The condenser 15 while being connected to the condenser 16.
A pipe having a circulation pump 13 is connected to the side to obtain warm water of medium temperature between the hot water storage tank 10 and the hot water obtained, and the hot water is stored in the hot water storage tank 10 at normal times.

Numeral 14 is a screw type fan attached to the low temperature side heat pump A, and numeral 21 is as required.
A hot water supply port for branching hot water to supply hot water to a heating / sterilization tank 20 described later.

On the other hand, as shown in the figure, the high temperature side heat pump A has a compressor 1, a condenser (steam generation part) 2, a refrigerant throttle pipe (capillary tube) 3, a refrigerant evaporator 4, and an accumulator 5 which are sequentially connected. Piped Freon R-12
In addition to being composed of a refrigeration cycle using 3 as a refrigerant,
Although not shown, a low pressure switch and a high pressure switch are usually provided on the outlet side of the evaporator 4 and the discharge side of the compressor 1, respectively.

However, the condenser 2 is supplied with water to be heated, for example, water, from a water supply source through a water supply pump 9 in the passage of the fluid to be heated provided in the condenser 2 as indicated by a dotted arrow in the figure. In the flow-through path, water is heat-exchanged with the refrigerant in a counterflow and is taken out as steam through the stop valve 6 and is sent to the high-temperature heating / sterilization tank 20. At the same time, there is hot water mixed with steam, or When the steam is not taken out, it is separated by a gas-liquid separator as necessary and is returned to the hot water storage tank 10 according to the solid line arrow in the figure.

The return pipe is connected to the hot water storage tank 1 from the water supply section.
It is also in charge of supplying water to 0.

Further, in the high temperature side heat pump B, the other evaporator 4 side reaches from the hot water storage tank 10 through the circulation pump 12 into the through-flow passage provided for the evaporator 4 to exchange heat with the refrigerant countercurrently. Then, a piping system for returning the hot water to the hot water storage tank 10 again is provided, and the hot water serves as the low temperature side heat source of the high temperature side heat pump A.

The hot water storage tank 10 is connected at its upper part with a pipe leading to a drainage groove 19 via a safety valve 11 corresponding to overflow water.

In the above apparatus, however, the amount of water supplied to the condenser 2 is controlled so as to match the heating capacity, and the condenser 2 for radiating heat from the high temperature heat source is adjusted to the heat radiation temperature and the compressor discharge pressure equivalent temperature. It goes without saying that the evaporator 4 that absorbs heat from the low-temperature heat source is designed in accordance with the endothermic temperature and the temperature equivalent to the suction pressure of the compressor.

Further, depending on the amount of heat absorbed by the evaporator 4, the condenser 2
If the amount of steam generated in the above is different and the amount of generated steam becomes too large, the steam pressure rises, which is dangerous at high temperature, and the temperature of the heat source for cooling the refrigerant rises, so the condensation pressure (temperature) rises, The steam temperature at the end of the period cannot be obtained. Therefore, in order to obtain steam of constant pressure or constant temperature, steam pressure regulators 7 and 8 for adjusting the amount of steam discharged at the outlet of the condenser 2
Attached. To stop using steam further, either stop the device or close the stop valve 6 at the steam outlet.
When the valve is closed, the pressure rises, so even if there is an outlet pressure control valve, the pressure becomes abnormally high (high temperature), so a signal is obtained from the pressure switch, or a signal is obtained from the temperature sensor attached to the outlet to stop the device. .

Next, when the temperature of the heat source on the low temperature side decreases and the temperature of the refrigerant vaporization in the evaporator 4 decreases, the suction pressure of the compressor decreases,
The compression ratio increases, which is not preferable. Therefore, a low pressure switch is provided to protect the compressor even when the pressure is abnormally low, and the device is stopped.

The temperature condition in which the cold water is concretely stored and the hot water and steam are generated will be described below.

First, when a refrigerant fluid containing ethylene glycol 30% brine was circulated in the low temperature side heat pump, the temperature was −0.72 ° C. on the evaporator inlet side of the low temperature side heat pump B and −4.59 ° C. on the outlet side. On the other hand, the hot water on the condenser side was 59.13 ° C on the inlet side and 62.18 ° C on the outlet side.

When this hot water was circulated through the high temperature side heat pump, it was 61.9 ° C. at the evaporator inlet side and 60.5 ° C. at the outlet side.
Met.

Next, when water of 23.6 ° C. was supplied from a water supply source to the steam generating part of this high temperature side heat pump, it became 124.3 ° C. steam in the evaporator, and when measured at the outlet side, it was 11
It was 2.4 ° C.

That is, heating without using a combustor
Steam of 110 to 115 ° C. for cooking and sterilization, hot water of about 60 ° C. sufficient for general hot water supply, and cooling of −10 to + 10 ° C. can all be achieved by the system of the present invention.

[0029]

As described above, the present invention is configured by combining two heat pumps, a low temperature side heat pump and a high temperature side heat pump, and a hot water storage tank.
Obtains steam and covers three types of operating temperature zones, high, medium, and low, where the difference between the upper limit temperature and the lower limit temperature is 100 ° C or more, without using a boiler that poses a risk of air pollution or fire. It has a remarkable practical effect that it can be used as a system for a cooling process, a hot water washing process, a high temperature heating / sterilization process using live steam, which has been hardly observed in the past. In addition, it mainly contributes to the leveling of electric power that is socially required to perform heat and cold storage at night, and at the same time, the use of nighttime electric power can be applied at a low power rate, which is economical. Is.

[Brief description of drawings]

FIG. 1 is a diagram showing an outline of a system of the present invention.

[Explanation of symbols]

 A High temperature side heat pump B Low temperature side heat pump 1 Compressor 2 Condenser 3 Refrigerant throttle pipe 4 Evaporator 10 Hot water tank 15 Circulation pump 16 Water heater 17 Reinforced water tank

Claims (2)

[Claims] 1. A low temperature side heat pump of simultaneous operation type in charge of a low temperature part for cooling or ice making, a medium temperature part for generating hot water, a hot water storage tank for storing hot water of the heat pump, a compressor, a condenser and a refrigerant. A heated fluid flow path is provided alongside the condenser of the refrigeration cycle including a throttle valve and an evaporator.
The evaporator is configured to be connected to a high-temperature side heat pump that absorbs heat from the hot water of the hot water storage tank and that generates steam in the condenser, and has three operating temperature zones of low temperature, medium temperature, and high temperature, and these three temperatures. A high / low temperature heat pump system characterized in that the difference between the upper limit temperature and the lower limit temperature of the belt is 100 ° C. or more. 2. The high / low temperature heat pump system according to claim 1, wherein the heat absorption amount of the high temperature side heat pump is smaller than the heat dissipation amount of the low temperature side heat pump.