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Liquid circulation heating system

a heating system and liquid circulation technology, applied in the field of liquid circulation heating system, can solve the problems of low gwp, inconvenient use of hfo-1234yf, etc., and achieve the effect of less impact on global warming

Inactive Publication Date: 2010-08-05
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]In view of the above circumstances, it is an object of the present invention to provide a liquid circulation heating system having less impact on global warming.
[0010]The present invention makes it possible to obtain a liquid circulation heating system having less impact on global warming.

Problems solved by technology

HFO-1234yf is, however, not suitable for use in heat pumps because of its low heating capability as a heating refrigerant, although it has a low GWP.

Method used

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Experimental program
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first embodiment

[0020]FIG. 1 shows a liquid circulation heating system 1A according to a first embodiment of the present invention. This liquid circulation heating system 1A heats a liquid to produce a heated liquid, releases heat of the heated liquid from a heating radiator 3, and thereby performs air-heating, for example, in a room. Specifically, the liquid circulation heating system 1A includes the heating radiator 3, a heat pump 2 for producing the heated liquid, and an overall controller 5 for controlling the entire system.

[0021]In the present embodiment, the heating radiator 3 is connected directly to the heat pump 2 by a supply pipe 31 and a recovery pipe 32 to be described later, so that the liquid flows without stopping. As the liquid, for example, an antifreeze liquid containing propylene glycol or the like dissolved in water can be used, but water is preferably used because it is available at low cost and in large quantities. The following description will be made on the assumption that ...

second embodiment

[0041]FIG. 5 shows a liquid circulation heating system 1B according to a second embodiment of the present invention. In the present embodiment, the same components as those in the first embodiment are designated by the same reference numerals and no further description is given.

[0042]The liquid circulation heating system 1B of the second embodiment has the same configuration as the liquid circulation heating system 1A of the first embodiment, except that the heating radiator 3 and the radiator 22 are connected via the hot water storage tank 8.

[0043]Furthermore, as a refrigerant for the heat pump 2, the same refrigerant as that described in the first embodiment also can be used in the present embodiment, and therefore the description of the refrigerant is not repeated here. The same description also is not repeated in the following embodiment and modifications.

[0044]The hot water storage tank 8 is a vertically cylindrical closed casing and is filled with water. The lower portion of t...

third embodiment

[0054]FIG. 6 shows a liquid circulation heating system 1C according to a third embodiment of the present invention. In the present embodiment, the same components as those in the first and second embodiments are designated by the same reference numerals and no further description is given.

[0055]In the liquid circulation heating system 1C of the third embodiment, hot water stored in the hot water storage tank 8 can be used directly for hot water supply. Specifically, the water inlet pipe 91 is connected to the lower portion of the hot water storage tank 8, and the hot water outlet pipe 93 is connected to the upper portion of the hot water storage tank 8. At an upper position in the hot water storage tank 8, a heat exchanger 83 for exchanging heat between the hot water stored in the hot water storage tank 8 and a heat transfer liquid (secondary liquid) is provided. The heat exchanger 83 is connected to the heating radiator 3 by the feed pipe 81 and the return pipe 82. When the circula...

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Abstract

A liquid circulation heating system includes a heat pump for producing a heated liquid and a heating radiator. The heat pump has a heat pump circuit for circulating a refrigerant to heat a liquid. The refrigerant contains tetrafluoropropene and difluoromethane as main components. According to the liquid circulation heating system having such a configuration, a negative impact on global warming can be reduced.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a liquid circulation heating system for performing air-heating using a liquid.[0003]2. Description of Related Art[0004]Conventionally, there has been known a liquid circulation heating system for producing hot water by a boiler or an electric heater and performing air-heating using the hot water produced. In recent years, the use of a heat pump capable of producing hot water with high efficiency has been considered as an alternative heat source to a boiler and an electric heater. For example, JP 2008-39306 A proposes a liquid circulation heating system for producing hot water by a heat pump and storing the produced hot water in a hot water storage tank. In this liquid circulation heating system, the hot water stored in the hot water storage tank is fed to, for example, a heating radiator placed indoors to radiate its heat, and then returned to the hot water storage tank.[0005]The heat pu...

Claims

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Application Information

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IPC IPC(8): F25B13/00F25D17/02
CPCC09K5/045C09K2205/126Y02B30/126F24D11/0214F25B9/006C09K2205/22Y02P20/10
Inventor NAKATANI, KAZUOISAYAMA, YASUHIKO
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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