SE466771B - Method and arrangement for monitoring the operation of a rotating heat exchanger by means of sensing the temperature of only the incoming air - Google Patents

Method and arrangement for monitoring the operation of a rotating heat exchanger by means of sensing the temperature of only the incoming air

Info

Publication number
SE466771B
SE466771B SE9000664A SE9000664A SE466771B SE 466771 B SE466771 B SE 466771B SE 9000664 A SE9000664 A SE 9000664A SE 9000664 A SE9000664 A SE 9000664A SE 466771 B SE466771 B SE 466771B
Authority
SE
Sweden
Prior art keywords
duct
temperature
rotor
air
supply air
Prior art date
Application number
SE9000664A
Other languages
Swedish (sv)
Other versions
SE9000664D0 (en
SE9000664L (en
Inventor
T Stark
Original Assignee
Stratos Ventilation Prod Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Stratos Ventilation Prod Ab filed Critical Stratos Ventilation Prod Ab
Priority to SE9000664A priority Critical patent/SE466771B/en
Publication of SE9000664D0 publication Critical patent/SE9000664D0/en
Priority to DK029191A priority patent/DK29191A/en
Priority to NO910690A priority patent/NO172151C/en
Priority to FI910839A priority patent/FI910839A/en
Publication of SE9000664L publication Critical patent/SE9000664L/en
Publication of SE466771B publication Critical patent/SE466771B/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
    • F24F12/001—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air
    • F24F12/006—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air using an air-to-air heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F28F27/006—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus specially adapted for regenerative heat-exchange apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2203/00—Devices or apparatus used for air treatment
    • F24F2203/10—Rotary wheel
    • F24F2203/104—Heat exchanger wheel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2203/00—Devices or apparatus used for air treatment
    • F24F2203/10—Rotary wheel
    • F24F2203/1068—Rotary wheel comprising one rotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2203/00—Devices or apparatus used for air treatment
    • F24F2203/10—Rotary wheel
    • F24F2203/1084—Rotary wheel comprising two flow rotor segments
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/56—Heat recovery units

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Air Supply (AREA)
  • Air Conditioning Control Device (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Abstract

Method and arrangement for monitoring the operation of a rotating heat exchanger with two adjacent ducts 1, 2 intended for air to flow through in opposite directions. Monitoring of the operation is effected by monitoring the temperature of the incoming air T, an indication of operational disruption being given if this temperature falls below a predetermined temperature, for example +10C, which is lower than that which can normally be expected after normal heat recovery in the exchanger rotor 3. <IMAGE>

Description

20 30 35 466 771 Driftsövervakning genom temperaturövervakning är i sig tidigare känd fràn SE-B-442 055, men härvid användes tre olika tempe- raturgivare för mätning av uteluftens, tilluftens och från- ( luftens temperaturer samt beräkning av värmeväxlarens verk- ningsgrad uttryckt som förhållandet mellan à ena sidan skill- \ naden mellan tilluft- och utelufttemperaturerna och å andra sidan skillnaden mellan frånluft- och utelufttemperaturerna. Operating monitoring by temperature monitoring is previously known from SE-B-442 055, but in this case three different temperature sensors were used for measuring the outdoor air, supply air and exhaust air temperatures and calculating the efficiency of the heat exchanger expressed as the relationship between, on the one hand, the difference between the supply air and outdoor air temperatures and, on the other hand, the difference between the exhaust air and outdoor air temperatures.

Bestämningen av denna verkningsgrad är med nödvändighet tämligen omständlig och kostsam.Determining this efficiency is necessarily rather cumbersome and costly.

Det har dock överraskande visat sig att den synnerligen enkla metoden resp. anordningen enligt uppfinningen ger lika säker och tillförlitlig övervakning av en roterande värmeväxlares normala funktion.However, it has surprisingly been found that the extremely simple method resp. the device according to the invention provides equally safe and reliable monitoring of the normal function of a rotary heat exchanger.

Roterande värmeväxlare har ofta en eftervärmare vanligtvis bestående av elektriska motstàndselement eller ett vattenburet värmarbatteri. För att åstadkomma den önskade driftövervakningen i sådana fall bör tillufttemperaturgivaren placeras mellan rotorn och eftervärmaren (jämför patentkraven 2 och 5), lämp- ligen avskärmad från eftervärmarens värmestrålning (jämför patentkraven 6 och 7). Vidare har det visat sig skärskilt för- delaktigt att placera tillufttemperaturgivaren vid sidan av kanalens centrum, såsom anges närmare i patentkravet 4. Här- igenom erhålles god marginal för felaktig larmgivning vid förekommande utelufttemperaturer.Rotary heat exchangers often have a reheater, usually consisting of electrical resistance elements or a water-borne heater battery. To achieve the desired operating monitoring in such cases, the supply air temperature sensor should be placed between the rotor and the reheater (cf. claims 2 and 5), suitably shielded from the heat radiation of the reheater (cf. claims 6 and 7). Furthermore, it has proved particularly advantageous to place the supply air temperature sensor next to the center of the duct, as specified in more detail in claim 4. As a result, a good margin is obtained for incorrect alarm giving at existing outdoor air temperatures.

Uppfinningen förklaras närmare nedan med hänvisning till bi- fogade ritning, som åskådliggör ett enkelt utföringsexempel.The invention is explained in more detail below with reference to the accompanying drawing, which illustrates a simple embodiment.

Fig. 1 visar grovt schematiskt en roterande värmeväxlare med temperaturgivare för driftövervakning i enlighet med uppfin- ningen; och Fig. 2 visar schematiskt värmeväxlarrotorn från höger i fig. 1. íí” 7A 10 15 20 3Û Den i fig. 1 visade värmeväxlaren omfattar tva invid varandra belägna kanaler 1,2, varvid frànluft (F) inströmmar i den övre kanalens 1 inloppsdel la, passerar genom den övre halvan 3a av en roterande, med axiella genomströmningspassager försedd värme- växlarrotor 3 (av i och för sig känt slag) och utströmmar såsom avluft (A) via kanalens 1 utloppsdel lb, medan uteluft (U) in- strömmar i den undre kanalens 2 inlcppsdel 2a, passerar genom växlarrotorns 3 undre halva 3b och utströmmar såsom tilluft via den undre kanalens 2 utloppsdel 2b, i vilken en eftervärmare 4 kan vara anordnad. En frànluftsfläkt 5 är placerad i utlopps- delen lb och ombesörjer luftströmmingen genom kanalen 1, normalt för utblasning till det fria utanför lokalen ifråga, och en tilluftfläkt 6 är placerad i utloppsdelen 2b, i förekommande fall nedströms eftervärmaren 4, och ombesörjer luftgenom- strömningen genom kanalen 2 för inblàsning av tilluft till nämnda lokal. I respektive inloppsdel 1a,2a är filter 7 resp. 8 anordnade för uppfàngning av fasta föroreningar i respektive luftström.Fig. 1 shows roughly schematically a rotary heat exchanger with temperature sensor for operation monitoring in accordance with the invention; and Fig. 2 schematically shows the heat exchanger rotor from the right in Fig. 1. The heat exchanger shown in Fig. 1 comprises two adjacent ducts 1,2, with exhaust air (F) flowing into the inlet part of the upper duct 1 1a, passes through the upper half 3a of a rotating, heat-exchanged passage provided with axial flow passages 3 (of a kind known per se) and outflows such as exhaust air (A) via the outlet part 1b of the duct 1, while outdoor air (U) flows in in the inlet part 2a of the lower duct 2, passes through the lower half 3b of the exchanger rotor 3 and flows out as supply air via the outlet part 2b of the lower duct 2, in which a reheater 4 can be arranged. An exhaust fan 5 is located in the outlet part 1b and provides the air flow through the duct 1, normally for exhaust to the outside outside the room in question, and a supply air fan 6 is located in the outlet part 2b, where applicable downstream of the reheater 4, and provides the air flow through the duct 2 for blowing supply air to said room. In the respective inlet part 1a, 2a, filters 7 resp. 8 arranged for capturing solid pollutants in the respective air stream.

Den normalt tämligen varma frànluften F uppvärmer väggarna i växlarrotorns 3 axiella genomströmningspassager, och den sålunda tillförda värmeenergin överföres under rotationen till den genom rotorns undre halva Bb genomströmmande, normalt kallare ute- luften U. Härvid uppnås vanligen en verkningsgrad pa ca 75%, sä att den fràn rdtorns undre halva Bb utströmmande tilluften er- håller en temperatur, som överstiger uteluftens temperatur med ca 75% av skillnaden mellan frànlufttemperaturen och uteluft- temperaturen. Om sålunda frànluften F är ca +20°C och uteluften U vid kall väderlek är ca -20°C blir tilluftens T temperatur (före eventuell eftervärmning) ca +1Û°C.The normally fairly warm exhaust air F heats the walls of the axial flow passages of the exchanger rotor 3, and the heat energy thus supplied is transferred during the rotation to the flow through the lower half Bb of the rotor, normally colder outdoor air U. An efficiency of about 75% is usually achieved. the supply air flowing from the lower half of the tower to the outside air reaches a temperature which exceeds the temperature of the outdoor air by about 75% of the difference between the exhaust air temperature and the outdoor air temperature. Thus, if the exhaust air F is approx. + 20 ° C and the outdoor air U in cold weather is approx. -20 ° C, the temperature of the supply air T (before any reheating) will be approx. + 1Û ° C.

Enligt uppfinningen övervakas värmeväxlarens funktion genom avkänning av tillufttemperaturen i utloppsdelen 2b medelst en temperaturgivare S1. Vid avkänning av en tillufttemperatur understigande en förutbestämd temperatur, t.ex. +10°C, som är 10 20 466 771 lägre än den som kan förväntas efter normal värmeàtervinning i växlarrotorn 3, avges (medelst icke visade medel) en larmsignal.According to the invention, the function of the heat exchanger is monitored by sensing the supply air temperature in the outlet part 2b by means of a temperature sensor S1. When sensing a supply air temperature below a predetermined temperature, e.g. + 10 ° C, which is 10 466 771 lower than that which can be expected after normal heat recovery in the exchanger rotor 3, an alarm signal is emitted (by means not shown).

För att eventuell larmindikering skall bli korrekt även vid extremt làga utetemperaturer placeras lämpligen temperatur- givaren S1 vid den sida av kanalens 2 utloppsdel 2a, där rotorns 3 axiella genomströmningspassager först inträder i kanalen 2.In order for any alarm indication to be correct even at extremely low outdoor temperatures, the temperature sensor S1 is suitably placed at the side of the outlet part 2a of the channel 2, where the axial flow passages of the rotor 3 first enter the channel 2.

Detta äskàdliggöres i fig. 2, där pilen P anger rotorns 3 rotationsriktning. Vid inträdet i kanalen 2 är rotorns 3 kanalväggar tämligen varma, varpà de under fortsatt rotation gradvis avsvalnar, sà att den utströmmande tilluften får olika temperatur, nämligen ca +15°C i punkten A, ca +10°C i punkten B och ca +5°C i punkten C vid de ovan angivna förutsättningarna (frànluft +20°C, uteluft -20°C>. Vid placering av temperatur- givaren S1 i närheten av punkten A kan således den undre tem- peraturgränsen för larm sättas vid +10°C med god marginal för felaktig larmgivning vid förekommande utelufttemperaturer. Denna temperaturgräns bör dock väljas med hänsyn till de klimatför- hällanden som rader i det område, där värmeväxlaren installeras.This is illustrated in Fig. 2, where the arrow P indicates the direction of rotation of the rotor 3. Upon entering the duct 2, the duct walls of the rotor 3 are rather warm, whereupon they gradually cool down during continued rotation, so that the outflowing supply air has a different temperature, namely approx. + 15 ° C at point A, approx. + 10 ° C at point B and approx. 5 ° C at point C under the above conditions (exhaust air + 20 ° C, outdoor air -20 ° C>. When placing the temperature sensor S1 near point A, the lower temperature limit for alarms can thus be set at +10 ° C with a good margin for incorrect alarm generation at existing outdoor air temperatures, however, this temperature limit should be chosen with regard to the climatic conditions as rows in the area where the heat exchanger is installed.

I det fall en eftervärmare 4 är anordnad i kanalens 2 utloppsdel 2b bör temperaturgivaren S1 placeras sa, att den ej påverkas nämnvärt av stràlvärme fràn eftervärmaren. Eventuellt kan det vara nödvändigt att avskärma temperaturgivaren S1 med en skärm, såsom antydes schematiskt i fig. 1 med den streckade linjen 9. |-.~In the event that a reheater 4 is arranged in the outlet part 2b of the duct 2, the temperature sensor S1 should be placed so that it is not appreciably affected by radiant heat from the reheater. Optionally, it may be necessary to shield the temperature sensor S1 with a screen, as schematically indicated in Fig. 1 by the dashed line 9. | -. ~

Claims (7)

10 15 29 25 30 .få ox om -1 w ...à PATENTKRAV10 15 29 25 30 .get ox in -1 w ... à PATENT CLAIMS 1. Sätt att driftövervaka en roterande värmeväxlare med två intilliggande, för luftgenomströmning àt motsatta hall avsedda kanaler (1,2), varvid en med axiella genomströmningspassager försedd värmeväxlarrotor (3) är anordnad med sin ena halva (3b) belägen i den ena kanalen (2) och med sin andra halva (3a) belägen i den andra kanalen (1), sa att i den ena kanalen (2) inströmmande uteluft (U) efter passage genom rotorn (3) utström- mar sàsom tilluft (T) och i den andra kanalen (1) inströmmande frànluft (F) efter passage genom rotorn (3) utströmmar såsom avluft (A), varvid driftövervakningen sker genom temperatur- övervakning, k ä n n e t e c k n a t av att man enbart övervakar tilluftens (T) temperatur, varvid driftstörnings- indikering sker om denna temperatur understiger en förutbestämd temperatur, t.ex. +10°C, som är lägre än den som kan förväntas efter normal värmeàtervinning i växlarrotorn (3).A method of monitoring the operation of a rotary heat exchanger with two adjacent channels (1,2) intended for air flow to the opposite hall, wherein a heat exchanger rotor (3) provided with axial flow passages is arranged with its one half (3b) located in one channel ( 2) and with its other half (3a) located in the second duct (1), so that in one duct (2) inflowing outdoor air (U) after passage through the rotor (3) flows out as supply air (T) and in the second duct (1) inflowing exhaust air (F) after passage through the rotor (3) flows out as exhaust air (A), the operation monitoring taking place by temperature monitoring, characterized in that only the temperature of the supply air (T) is monitored, whereby indication occurs if this temperature falls below a predetermined temperature, e.g. + 10 ° C, which is lower than expected after normal heat recovery in the exchanger rotor (3). 2. Sätt enligt krav 1, k ä n n e t e c_k n a t av att man avkänner temperaturen hos tilluften (T) innan den senare passe- rar en eftervärmare (4).2. A method according to claim 1, characterized in that the temperature of the supply air (T) is sensed before the latter passes a reheater (4). 3. Anordning för driftövervakning av en roterande värmeväxlare med tva intilliggande, för luftgenomströmning àt motsatta hall avsedda kanaler (1,2), varvid en med axiella genomströmnings- passager försedd värmeväxlarrotor (3) är anordnad med sin ena halva (3b) belägen i den ena kanalen (2) och med sin andra halva (3a) belägen i den andra kanalen (1), så att i den ena kanalen (2) inströmmande uteluft (U) efter passage genom rotorn (3) ut- strömmar sàsom tilluft (T) och i den andra kanalen inströmmande franluft (F) efter passage genom rotorn utströmmar såsom avluft (A), k ä n n e t e c k n a d av att en temperaturgivare (S1) är anordnad i nämnda ena kanal (2b) nedströms rotorn för av- känning av tilluftens (T) temperatur, varvid indikeringsorgan UI 10 20 25 466 771 är inrättade att avge en driftstörningsindikeringssignal om den avkända tillufttemperaturen understiger en förutbestämd tempe- ratur, t.ex. +10°C, som är lägre än den som kan förväntas efter normal värmeàtervinning i växlarrotorn (3).Device for operational monitoring of a rotary heat exchanger with two adjacent ducts (1,2) intended for air flow to opposite halls, wherein a heat exchanger rotor (3) provided with axial flow passages is arranged with its one half (3b) located in the one duct (2) and with its other half (3a) located in the second duct (1), so that in one duct (2) inflowing outdoor air (U) after passage through the rotor (3) flows out as supply air (T ) and exhaust air (F) flowing into the second duct after passage through the rotor flows out as exhaust air (A), characterized in that a temperature sensor (S1) is arranged in said one duct (2b) downstream of the rotor for sensing the supply air ( T) temperature, wherein indicating means UI 10 20 25 466 771 are arranged to emit a malfunction indication signal if the sensed supply air temperature is below a predetermined temperature, e.g. + 10 ° C, which is lower than expected after normal heat recovery in the exchanger rotor (3). 4. Anordning enligt krav 3, k ä n n e t e c k n a d av att nämnda tillufttemperaturgivare (S1) är placerad vid sidan av kanalens C2b) centrum, nämligen vid den sida där växlarrotorns (3) genomströmningspassager under rotationen först inträder i kanalen.Device according to claim 3, characterized in that said supply air temperature sensor (S1) is located next to the center of the duct C2b), namely at the side where the flow passages of the exchanger rotor (3) during rotation first enter the duct. 5. Anordning enligt krav 3 eller 4, k ä n n e t e c k n a d av att nämnda tillufttemperaturgivare (S1) är placerad mellan växlarrotorn (3) och en eftervärmare (4).Device according to claim 3 or 4, characterized in that said supply air temperature sensor (S1) is located between the exchanger rotor (3) and a reheater (4). 6. Anordning enligt krav S, k ä n n e t e c k n a d av att tillufttemperaturgivaren (S1) är sä placerad, att eftervärmarens (4) värmestràlpäverkan pà temperaturgivaren (S1) är försumbar.Device according to Claim S, characterized in that the supply air temperature sensor (S1) is positioned in such a way that the heat radiation effect of the reheater (4) on the temperature sensor (S1) is negligible. 7. Anordning enligt krav 5, k ä n n e t e c k n a d av att en skärm (9) är anordnad att avskärma eftervärmarens (4) värme- strålning mot temperaturgivaren (S1). ffivDevice according to claim 5, characterized in that a screen (9) is arranged to shield the heat radiation of the reheater (4) from the temperature sensor (S1). f fi v
SE9000664A 1990-02-23 1990-02-23 Method and arrangement for monitoring the operation of a rotating heat exchanger by means of sensing the temperature of only the incoming air SE466771B (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
SE9000664A SE466771B (en) 1990-02-23 1990-02-23 Method and arrangement for monitoring the operation of a rotating heat exchanger by means of sensing the temperature of only the incoming air
DK029191A DK29191A (en) 1990-02-23 1991-02-20 METHOD AND DEVICE FOR OPERATING MONITORING OF A ROTATING HEAT EXCHANGE
NO910690A NO172151C (en) 1990-02-23 1991-02-21 PROCEDURE AND DEVICE FOR OPERATING MONITORING OF A ROTATING HEAT EXCHANGER
FI910839A FI910839A (en) 1990-02-23 1991-02-21 SAETTING THE ORIGINATION OF DRIFTOEVERVAKNING AV EN ROTERANDE VAERMEVAEXLARE.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9000664A SE466771B (en) 1990-02-23 1990-02-23 Method and arrangement for monitoring the operation of a rotating heat exchanger by means of sensing the temperature of only the incoming air

Publications (3)

Publication Number Publication Date
SE9000664D0 SE9000664D0 (en) 1990-02-23
SE9000664L SE9000664L (en) 1991-08-24
SE466771B true SE466771B (en) 1992-03-30

Family

ID=20378669

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9000664A SE466771B (en) 1990-02-23 1990-02-23 Method and arrangement for monitoring the operation of a rotating heat exchanger by means of sensing the temperature of only the incoming air

Country Status (4)

Country Link
DK (1) DK29191A (en)
FI (1) FI910839A (en)
NO (1) NO172151C (en)
SE (1) SE466771B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5027477A (en) * 1989-03-20 1991-07-02 Seron Manufacturing Company Break away lanyard

Also Published As

Publication number Publication date
SE9000664D0 (en) 1990-02-23
NO172151C (en) 1993-06-09
DK29191A (en) 1991-08-24
FI910839A0 (en) 1991-02-21
DK29191D0 (en) 1991-02-20
NO172151B (en) 1993-03-01
NO910690D0 (en) 1991-02-21
FI910839A (en) 1991-08-24
NO910690L (en) 1991-08-26
SE9000664L (en) 1991-08-24

Similar Documents

Publication Publication Date Title
US10132576B2 (en) Method for operating a heat exchanger using temperature measurements to determine saturation level
KR101536284B1 (en) Sensor device for detecting frost accumulation used for defrosting outdoor evaporator of a heat-pump system
JP3855917B2 (en) Air conditioner test equipment
EP3489592A1 (en) Filter contamination detection method
WO2010102627A1 (en) A building ventilation air-to-air heat exchanger control
CN107990480A (en) Air-conditioning equipment dewing-proof method and device
SE466771B (en) Method and arrangement for monitoring the operation of a rotating heat exchanger by means of sensing the temperature of only the incoming air
EP2816295B1 (en) An HVAC system having a diagnostics controller associated therewith
CZ20011602A3 (en) Device for registering heat generated by a heating body and for regulation of heat within a room
Kirby et al. Effect of airflow nonuniformity on evaporator performance/Discussion
US11193684B2 (en) Detecting blockage of air conditioner unit based on control signal
JP6254473B2 (en) Condensation detector
CN103765121A (en) Method for operating liquid-to-air heat exchanging device
FI117647B (en) Antifreeze for heat recovery installations
EP3115705A2 (en) Method of optimizing the dehumidification function for air-conditioning units for server rooms and the like and air-conditioning unit for applying such method
JPH08504031A (en) Method and apparatus for temperature monitoring for rotary regenerative heat exchanger
JPH05157299A (en) Heat exchanging ventilator
JPS61130739A (en) Ventilating control equipment
FI129621B (en) Controlling the frost protection system of a heat recovery machine
SE542844C2 (en) Method and device for reducing the influence of the supply air temperature during defrosting operation in an air treatment unit arranged with a heat pump
CN112345794B (en) Fan airflow direction detection device and method
KR102132672B1 (en) Photoelectric Detection Device of White Smoke
CN215301265U (en) Recorder and condensed water anti-backflow device thereof
JP2006078132A (en) Testing device of air conditioner
KR0167802B1 (en) Heat recovery apparatus with control sleeve inserted

Legal Events

Date Code Title Description
NAL Patent in force

Ref document number: 9000664-4

Format of ref document f/p: F

NUG Patent has lapsed

Ref document number: 9000664-4

Format of ref document f/p: F