Heat pump system of cobination of ammonia cycle and carbon dioxide cycle loop

Abstract

A novel heat pump system capable of carrying out a cooling (refrigerating) operation or a heating (room heating) operation with ammonia and carbon dioxide, natural media, utilized in a combined state. The heat pump system (1) comprises a combination of an ammonia cycle (2), and a carbon dioxide cycle (3), and is characterized in that a carbon dioxide medium is circulated in the carbon dioxide cycle (3) by heating or cooling a part of the cycle, in addition to utilizing a natural circulation phenomenon in which a liquid head difference is formed in a carbon dioxide medium in the cycle without incorporating a compressor in the cycle, structural members of the ammonia cycle (2) being installed in a place isolated from a machine for cooling and heating an object material.

Description

technical field [0001] The present invention relates to a heat pump system using natural media, in particular to a novel heat pump system that uses natural media such as ammonia and carbon dioxide but can achieve economical practicability. Background technique [0002] In order to prevent damage to the ozone layer around the earth and global warming, in the Montreal Protocol and the Kyoto Conference on the Prevention of Global Warming, the use of chlorofluorocarbons (CFCs) and hydrogenated chlorofluorocarbons (HCFCs) was banned or reduced. ), Hydrofluorocarbons (HFC) and other refrigerants have made resolutions. CFC, HCFC, and HFC are respectively called specific halocarbons, designated halocarbons, and alternative halocarbons. The specific restrictions are that specific halocarbons will be completely banned by the end of 1995, and designated halocarbons will be completely banned by 2020. Use is prohibited, and for the replacement of halocarbons, emissions to the atmosphere...

AI Technical Summary

Problems solved by technology

[0003] However, ammonia is toxic, and its use is subject to many restrictions. For example, if it is to be used in the evaporators of air conditioners in various buildings, including supermarkets with a large passenger flow, and restaurants, etc., it is safe, Difficulty in operating

[0004] As carbon dioxide gas, its critical temperature (31.1°C) is low, and its saturation pressure at room temperature is high (as an example, for example: at 31.1°C, it is about 75kg / cm 2 Abs), therefore, the efficiency is poor when used in air-conditioning refrigeration equipment with high evaporation temperature, which is not conducive to the use

And when it is necessary to use a compressor for this reason, the related equipment must have high pressure resistance, so it is not only heavy but also expensive; due to such a problem, as a heat pump system such as a binary refrigeration device using ammonia and carbon dioxide, Although theoretically possible, there are practical problems and the current status is that it is hardly adopted

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