JPS60221665A - 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 (a) Industrial Application Field The present invention relates to a heat pump device that extracts a high temperature fluid from a low temperature heat source fluid, and particularly relates to a heat pump device that extracts a high temperature fluid from a low temperature heat source fluid. The present invention relates to a heat pump device that is airtightly connected to form a closed circulation cycle of working fluid.

(b) Conventional heat pump devices include gas compression type, absorption type, magnet type, and other types, but the ones currently in practical use are gas compression type and absorption type heat pumps. Reciprocating I-type and scree-type turbo compressors are used for gas compression type and one-pump compressors, and the gas pressurized by such gas compressors is guided to the condensing section and the heated heat is transferred to the outside. At the same time, by replenishing heat to the gas circulation cycle system from the evaporator, a high-temperature fluid can be obtained from a low-temperature heat source fluid.

In order to obtain a fluid at a higher temperature level in a heat pump with such a configuration, for example,
As shown in Figure 1 of No. 6280, a compressor (1),
A refrigerant circulation cycle (3) on the low temperature side with an evaporator (2) etc.
) refrigerant condensing section (4) and compressor (5), I# condenser (6
), an expansion valve (7), etc., connected to the evaporator section (9) of the refrigerant circulation cycle (8) on the high temperature side so as to exchange heat, is also known as a cascade type heat bomb device. . By increasing the number of connections in this cascade, it should theoretically be possible to raise the temperature to a considerably high temperature using a heat pump, but generally speaking, the material used as the working fluid of a heat pump is a refrigerant. In the coexistence of copper and iron-based metals, which are the materials forming the devices that make up the circulation cycle, thermal decomposition begins at a temperature of more than 100 degrees Celsius, making it difficult to use as a working fluid for heat pumps over long periods of time. When fluorocarbons are used as the working fluid, the critical temperature of fluorocarbons is 100°C to 150°C, so operation as a vapor compression cycle cannot be expected in a higher temperature range.

For this reason, conventionally, the temperature of the fluid taken out by a gas compression type heat pump device was generally about 70°C, and even when the temperature was raised at the expense of the coefficient of performance, the practical drawing temperature limit was about 100°C.

(c) Purpose of the Invention The present invention, which takes these points into consideration, is a method for extracting fluid heated to a higher temperature than conventional ones using a gas compression heat pump, for example, even fluid at 100°C to 200°C. The purpose of this invention is to obtain a heat pump device with a

2) Structure of the Invention For this purpose, in the present invention, in a plurality of independent closed circulation cycles connected in cascade as described above, Freon is used as the working fluid in the low-temperature side cycle, and Freon is used as the working fluid in the high-temperature side cycle. It uses fluorinated alcohol such as trifluoroethanol, and can operate even during closed circulation cycles on the high-temperature side, where the temperature is raised to high inside equipment that is pressurized by a gas compressor and surrounded by various metal materials. It is possible to obtain high-temperature fluid from the evaporation section of the working fluid by preventing the deterioration of the fluid.

(e) Examples The present invention will be described in detail below with reference to the drawings.

FIG. 2 is a cycle configuration diagram conceptually showing an example of an embodiment of the heat pump device according to the present invention, and (3) is a cycle configuration diagram conceptually showing an embodiment of the heat pump device according to the present invention.
As shown in the figure, the working fluid circulation cycle on the low temperature side is formed by airtightly connecting the gas compressor (1), condenser (4), expansion valve, evaporator (2), etc. with the pipe Ql), (8) are gas compressor (5), condenser (6), expansion valve (7) and evaporator (9)
This is a working fluid circulation cycle on the high temperature side in which the working fluid circulation cycle is airtightly connected with the pipe α2 to form an independent working fluid circulation cycle from the low temperature side cycle (3), and the condenser serves as the gas condensation part of the low temperature side cycle. (4) and the evaporator (9) serving as the gas evaporation section of the high-temperature side cycle are connected in such a manner that they mutually exchange heat, and both cycles constitute one heat pump device as a whole.

Accordingly, in the present invention, fluorocarbons such as R112, R114, R133a, etc. are used as the working fluid in the cycle (3) on the low temperature side, and fluorocarbons such as trifluoroethanol are used as the working fluid in the cycle (8) on the high temperature side. alcohol is used.

Among these, for example, R12 (
dichlorodifluoromethane) and TFE (2,2,2 trifluoroethanol) in cycle (8) on the high temperature side.
When using R12 and TFE, the physical properties are as shown in Table 1.As an example of appropriate usage conditions within these ranges, the evaporator of the low temperature side cycle The temperature of (2) is 0°C (the temperature of the fluid serving as a heat source is about 7°C), and the condensation temperature of R12 in the condenser (4) is about 90'C, and TFE, which is the working fluid of the high temperature side cycle, is If the evaporation temperature in the evaporator (9) is 80°C and the condensation temperature in the condenser (6) is 200°C,
The fluid to be heated supplied from the condenser (6) to the load α can be heated to approximately iso'c.

In this case, looking at the pressure conditions applied to the compressor in each cycle, the low temperature side is the temperature and pressure conditions used in general air conditioners and refrigerators, and even in the high temperature side cycle, the evaporator side is 1. , 4 kg/, I Abs, and 30 k17/, i Abs on the condenser side, so even in the high-temperature side cycle, the conventionally used fluorocarbon refrigerant compressor can be used under almost the same conditions.

However, the displaced volume of the compressor is about 1.7 times that of the low-temperature side, so a slightly larger compressor must be used, but a single circulation cycle using only TFE as the working fluid of the heat pump device is the same as above. Heat pump operation under conditions (
Assuming that the temperature is 0°C on the evaporating side and 200°C on the condensing side, the specific suction volume of the compressor will be tz5m or more, and in this case, the heating capacity will be lower than the 0°C suction cycle using R12. Even if it is twice as large, the volume of the compressor is 1
The heat pump device of the present invention has great practical value, considering the drawbacks such as heat dissipation loss from the airframe and an increase in the size of the device.

Table 2 shows other numerical values under the above-mentioned conditions of the heat pump device of the present invention as reference values (theoretical values).

(F) Effects of the Invention In this way, the present invention integrates two independent gas compression type working fluid circulation cycles in such a way that the condensing section of the low temperature side cycle exchanges heat with the evaporation section of the high temperature side cycle. At the same time, we used fluorocarbons as the working fluid in the low-temperature cycle and fluorinated alcohol as the working fluid in the high-temperature cycle, making it easier to compare heat pumps that use only fluorocarbon-based working fluids. several dozen degrees (
It is possible to stably supply fluid heated to ρ8 degrees Celsius to the load, and the size of this heat pump device is comparable to the size of the equipment expected when only fluorinated alcohol is used as the working fluid. In comparison, it can be provided as a device that is significantly smaller in size and slightly larger than a heat pump device that uses only a fluorocarbon-based working fluid.

[Brief explanation of drawings]

FIG. 1 is a refrigerant circuit diagram showing an example of a cascade type refrigeration system, and FIG. 2 is a block diagram for explaining a heat pump system according to the present invention. [11 (51 ~ gas compressor, (2) (91 ~ evaporator,
(3) ~ Low temperature side cycle, +4) (67 ~ Condenser,
(7) α0) ~ expansion valve, (8) ~ high temperature side cycle,
(11) α~tube, aJ~load. Applicant: Sanyo Electric Co., Ltd. and 1 other representative: Patent attorney: Shizuo Sano

Claims (1)

[Claims] (1) In multiple closed circulation cycles formed by airtightly connecting gas compressors, condensers, expansion valves, evaporators, etc. with piping, the condensation section of the working fluid circulation cycle on the low temperature side is connected to the condensation section of the circulation cycle on the high temperature side. In a device that exchanges heat with a gas evaporation section and extracts heated fluid from a gas condenser in a high-temperature cycle, fluorocarbon is used as the working fluid in the low-temperature cycle, and fluorinated alcohol is used as the working fluid in the high-temperature cycle. A heat pump device characterized by using.