Invention Grant
- Patent Title: HVAC system with electronically controlled expansion valve
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Application No.: US14480510Application Date: 2014-09-08
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Publication No.: US10852041B2Publication Date: 2020-12-01
- Inventor: Raymond Walter Rite , Don Alan Schuster , Jonathan Thrift
- Applicant: Trane International Inc.
- Applicant Address: US NC Davidson
- Assignee: Trane International Inc.
- Current Assignee: Trane International Inc.
- Current Assignee Address: US NC Davidson
- Agency: Taft Stettinus & Hollister LLP
- Main IPC: F25B49/00
- IPC: F25B49/00 ; F25B49/02 ; F25B41/06

Abstract:
A two temperature electronic expansion valve control for variable speed compressors that utilizes a correlation between airflow percentage and heat exchanger pressure drop to control the operation of an expansion valve. An indoor airflow percentage request may be communicated from an outdoor controller to an air handler controller. Using a correlation between airflow percentage and pressure drop across the heat exchanger, the airflow percentage may be used in predicting an outlet pressure of refrigerant exhausted from the heat exchanger. The predicted pressure drop may be used in determining a saturated temperature for the exhausted refrigerant. The determined saturated temperature may be compared to a sensed temperature of the refrigerant at the outlet of the heat exchanger to determine a superheat value, which is compared to a reference superheat value in determining the degree to open or close the expansion valve.
Public/Granted literature
- US20150068231A1 HVAC System with Electronically Controlled Expansion Valve Public/Granted day:2015-03-12
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