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Refrigerating unit

A refrigeration and refrigerant technology, applied in the field of refrigeration units, can solve the problems of low heat exchange efficiency and large size of condenser units

Inactive Publication Date: 2004-06-23
HITACHI JOHNSON CONTROLS AIR CONDITIONING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, the heat exchange efficiency of the air-cooled condenser unit is low, so in order to obtain a higher degree of subcooling, the unit must be of larger size

Method used

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Experimental program
Comparison scheme
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Embodiment Construction

[0023] Preferred embodiments of the present invention will be explained in detail below with reference to the accompanying drawings

[0024] It should be noted that the arrows shown in the figures indicate the flow direction of the refrigerant.

[0025] Referring to Fig. 1, this figure shows a refrigerating unit I and low-pressure side devices, which are connected together by pipeline connecting parts 11 and 12, thereby constituting a refrigerating cycle.

[0026] HFC refrigerants such as HFC125 (40% to 48%), HFC143a (47% to 57%), and HFC134a (2 % to 8%), in the case of a three-component mixed refrigerant, insufficient subcooling of the liquid coolant occurs in the condenser, causing the following problems: Insufficient capacity and overheating of the compressor. Also, HFC-type refrigerants have lower latent heat, which is 70% of that of refrigerant R22 on the evaporator side, and the higher the degree of supercooling, the stronger the cooling capacity. Therefore, in the ca...

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PUM

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Abstract

A refrigeration unit using HFC group coolant, having an enhanced cooling capacity so that the performance and the performance coefficient thereof can be enhanced, and the operation thereof can be stably made, the refrigeration unit having a refrigerating cycle in which a compressor, a condenser, a expansion valve and an evaporator are connected in series in the mentioned order, it comprises HFC group coolant, and a subcooler located between the condenser and the evaporator, wherein the HFC group coolant is turned into liquid coolant in the subcooler, and is then branched into a main liquid stream and a substream which super-cools the main liquid stream through a super-cooling expansion valve, and is led into the intermediate stage part of the compressor.

Description

technical field [0001] The present invention relates to a refrigeration unit, in particular to a refrigeration unit which does not pose a risk of depletion of the ozone layer, which is at least suitable for recirculating it, which is preferred in terms of stable operation, and which can Improve efficiency and achieve miniaturization. Background technique [0002] Conventionally, a refrigeration unit is known, as disclosed in Japanese Laid-Open Patent No. H2-287059, in which the refrigerant is divided into one The main liquid flow and a sub-flow used to subcool the main liquid flow through the medium of the subcooled expansion valve, thereby improving energy savings and freon gas savings. [0003] Among the above mentioned technologies, the coolant R22 which has been used in conventional refrigeration units is not preferable in terms of preventing global warming and preventing ozone depletion or recirculating the refrigeration units. Therefore, it is desirable to use a refr...

Claims

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Application Information

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IPC IPC(8): F25B1/00F25B1/047F25B39/04F25B40/02F25B41/04
CPCF25B2400/13F25B40/02F25B41/04F25B41/20F25B39/04
Inventor 加濑泽实广桥纯一
Owner HITACHI JOHNSON CONTROLS AIR CONDITIONING INC