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Method of controlling level of superheat during pump mode of operation, and refrigeration system

A refrigeration system, operating mode technology, used in the field of control of superheat levels during pump operating mode and refrigeration systems

Active Publication Date: 2018-04-03
VERTIV CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Although modern economizer systems regulate the system's EEV (electronic expansion valve) to maintain the proper pump differential pressure when operating in pump mode, there is no control over the superheat leaving the evaporator when the system is operating in pump mode

Method used

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  • Method of controlling level of superheat during pump mode of operation, and refrigeration system
  • Method of controlling level of superheat during pump mode of operation, and refrigeration system
  • Method of controlling level of superheat during pump mode of operation, and refrigeration system

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Embodiment Construction

[0017] The following description is merely exemplary in nature, and is not intended to limit the present disclosure, application or use of the present disclosure. It should be understood that throughout the drawings, corresponding reference numerals indicate the same or corresponding parts and features.

[0018] The system and method involve the use of an electronic expansion valve (EEV), which is used to adjust the pump pressure difference during the pumping mode of operation. In addition, the system and method involve applying a control program to control the superheat leaving the evaporator. The superheat leaving the evaporator is controlled along with the pump pressure difference, which eliminates or significantly reduces the possibility of liquid refrigerant accumulating in the compressor crankcase (ie, sump) and causing oil dilution during the pumping mode of operation. Importantly, the system and method will not negatively affect the overall efficiency of the system.

[00...

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Abstract

The present invention provides a system and method of controlling a level of superheat during a pump mode of operation of a refrigeration system, wherein the refrigeration system can operate in eitherthe pump mode or a compressor mode, and has an electronically controlled expansion valve (EEV). A controller obtains a stored, predetermined pump differential pressure range able to be produced by apump of the system. The controller also obtains a stored, predetermined superheat range, and detects a superheat level. When the detected superheat level is outside of the superheat temperature range,the controller commands adjusting at least one of the EEV and a speed of the pump based on whether the detected superheat level is above or below the superheat range, and whether a current pump differential pressure is above or below the predetermined pump differential pressure range.

Description

[0001] Cross references to related applications [0002] This application claims priority to the U.S. Provisional Application Serial No. 62 / 311,765 filed on March 22, 2016, and the entire disclosure of the provisional application is hereby incorporated into this disclosure by reference. Technical field [0003] The present disclosure relates to a refrigeration system, and more specifically to a refrigeration system having a pumped refrigerant "economizer" operation mode and a control method used in combination with the refrigeration system, and more specifically to a pressure difference and Overheating is monitored and controlled to prevent damage to the compressor of the system when operating in pump mode (ie, refrigerant economizer mode) and when the system is switched from pump mode to compressor mode. Background technique [0004] The statements in this section only provide background information related to the present disclosure, and the statements in this section may not const...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B49/02
CPCF25B49/02F25B2600/13F25B2600/2513F25B2700/21
Inventor 罗杰·诺尔丹尼尔·J·舒特马修·拉韦约翰·比尔克迈尔
Owner VERTIV CORP