Variable evaporator water flow compensation for leaving water temperature control
A method of controlling a refrigerant chiller system is particularly suited for chillers where the water being chilled (or some other liquid) flows through the chiller's evaporator at a flow rate that is variable and is not directly known. To effectively control the chiller and maintain the tem...
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| creator | VANDERZEE JOEL C OKOREN RONALD W |
| description | A method of controlling a refrigerant chiller system is particularly suited for chillers where the water being chilled (or some other liquid) flows through the chiller's evaporator at a flow rate that is variable and is not directly known. To effectively control the chiller and maintain the temperature of the water leaving the evaporator at a desired target temperature, the cooling capacity of the chiller's evaporator is estimated based the degree of valve opening of an expansion valve, a pressure differential across the expansion valve, and a change in enthalpy per unit mass of the refrigerant flowing through the evaporator. In some embodiments, the chiller system includes multiple refrigerant circuits that are hermetically isolated from each other. |
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To effectively control the chiller and maintain the temperature of the water leaving the evaporator at a desired target temperature, the cooling capacity of the chiller's evaporator is estimated based the degree of valve opening of an expansion valve, a pressure differential across the expansion valve, and a change in enthalpy per unit mass of the refrigerant flowing through the evaporator. In some embodiments, the chiller system includes multiple refrigerant circuits that are hermetically isolated from each other.</description><language>eng</language><subject>BLASTING ; COLD ROOMS ; COMBINED HEATING AND REFRIGERATION SYSTEMS ; COOLING OR FREEZING APPARATUS NOT COVERED BY ANY OTHERSUBCLASS ; HEAT PUMP SYSTEMS ; HEATING ; ICE-BOXES ; LIGHTING ; LIQUEFACTION SOLIDIFICATION OF GASES ; MANUFACTURE OR STORAGE OF ICE ; MECHANICAL ENGINEERING ; REFRIGERATION OR COOLING ; REFRIGERATORS ; WEAPONS</subject><creationdate>2012</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20120313&DB=EPODOC&CC=US&NR=8132420B2$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,780,885,25562,76317</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20120313&DB=EPODOC&CC=US&NR=8132420B2$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>VANDERZEE JOEL C</creatorcontrib><creatorcontrib>OKOREN RONALD W</creatorcontrib><title>Variable evaporator water flow compensation for leaving water temperature control</title><description>A method of controlling a refrigerant chiller system is particularly suited for chillers where the water being chilled (or some other liquid) flows through the chiller's evaporator at a flow rate that is variable and is not directly known. To effectively control the chiller and maintain the temperature of the water leaving the evaporator at a desired target temperature, the cooling capacity of the chiller's evaporator is estimated based the degree of valve opening of an expansion valve, a pressure differential across the expansion valve, and a change in enthalpy per unit mass of the refrigerant flowing through the evaporator. In some embodiments, the chiller system includes multiple refrigerant circuits that are hermetically isolated from each other.</description><subject>BLASTING</subject><subject>COLD ROOMS</subject><subject>COMBINED HEATING AND REFRIGERATION SYSTEMS</subject><subject>COOLING OR FREEZING APPARATUS NOT COVERED BY ANY OTHERSUBCLASS</subject><subject>HEAT PUMP SYSTEMS</subject><subject>HEATING</subject><subject>ICE-BOXES</subject><subject>LIGHTING</subject><subject>LIQUEFACTION SOLIDIFICATION OF GASES</subject><subject>MANUFACTURE OR STORAGE OF ICE</subject><subject>MECHANICAL ENGINEERING</subject><subject>REFRIGERATION OR COOLING</subject><subject>REFRIGERATORS</subject><subject>WEAPONS</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>2012</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNqNyzsOwjAQhOE0FAi4w14ACRwKahCIFvFooyUaI0vGa62X5Pq4yAGopvi_mTfXJ2vgVwRh4CzKJkojG5R8lJF6-WSkwhYkka8tgoeQ3pMx1FxPX0WlyVTispl5jgWraRcNnU_342WNLB1K5h4J1j1u-23rdm5zcO0f5Afl7Dhl</recordid><startdate>20120313</startdate><enddate>20120313</enddate><creator>VANDERZEE JOEL C</creator><creator>OKOREN RONALD W</creator><scope>EVB</scope></search><sort><creationdate>20120313</creationdate><title>Variable evaporator water flow compensation for leaving water temperature control</title><author>VANDERZEE JOEL C ; OKOREN RONALD W</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_US8132420B23</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>2012</creationdate><topic>BLASTING</topic><topic>COLD ROOMS</topic><topic>COMBINED HEATING AND REFRIGERATION SYSTEMS</topic><topic>COOLING OR FREEZING APPARATUS NOT COVERED BY ANY OTHERSUBCLASS</topic><topic>HEAT PUMP SYSTEMS</topic><topic>HEATING</topic><topic>ICE-BOXES</topic><topic>LIGHTING</topic><topic>LIQUEFACTION SOLIDIFICATION OF GASES</topic><topic>MANUFACTURE OR STORAGE OF ICE</topic><topic>MECHANICAL ENGINEERING</topic><topic>REFRIGERATION OR COOLING</topic><topic>REFRIGERATORS</topic><topic>WEAPONS</topic><toplevel>online_resources</toplevel><creatorcontrib>VANDERZEE JOEL C</creatorcontrib><creatorcontrib>OKOREN RONALD W</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>VANDERZEE JOEL C</au><au>OKOREN RONALD W</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>Variable evaporator water flow compensation for leaving water temperature control</title><date>2012-03-13</date><risdate>2012</risdate><abstract>A method of controlling a refrigerant chiller system is particularly suited for chillers where the water being chilled (or some other liquid) flows through the chiller's evaporator at a flow rate that is variable and is not directly known. To effectively control the chiller and maintain the temperature of the water leaving the evaporator at a desired target temperature, the cooling capacity of the chiller's evaporator is estimated based the degree of valve opening of an expansion valve, a pressure differential across the expansion valve, and a change in enthalpy per unit mass of the refrigerant flowing through the evaporator. In some embodiments, the chiller system includes multiple refrigerant circuits that are hermetically isolated from each other.</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | BLASTING COLD ROOMS COMBINED HEATING AND REFRIGERATION SYSTEMS COOLING OR FREEZING APPARATUS NOT COVERED BY ANY OTHERSUBCLASS HEAT PUMP SYSTEMS HEATING ICE-BOXES LIGHTING LIQUEFACTION SOLIDIFICATION OF GASES MANUFACTURE OR STORAGE OF ICE MECHANICAL ENGINEERING REFRIGERATION OR COOLING REFRIGERATORS WEAPONS |
| title | Variable evaporator water flow compensation for leaving water temperature control |
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