SE445487B

SE445487B - Cooling system

Info

Publication number: SE445487B
Application number: SE8405560A
Authority: SE
Inventors: R Alexandersson; H Vesterberg
Original assignee: Ericsson Telefon Ab L M
Priority date: 1984-11-06
Filing date: 1984-11-06
Publication date: 1986-06-23
Also published as: SE8405560L; SE8405560D0

Abstract

Cooling system for maintaining a desired temperature in a room with the help of a heat exchanger that is connected to a fluid reservoir. The cooling system is equipped with an auxiliary system (7, 8), which applies the thermosyphon principle to use the outer air to cool the room (2), and, if necessary, an additional auxiliary system containing an air conditioning unit. If one of the auxiliary systems stops working, cooling of the room can continue for a period determined by the amount and temperature of the fluid in the reservoir.<IMAGE>

Description

8405560-7 10 15 20 25 rörledning star i förbindelse med en värmeväxlare 5. Vattnet halls i cirkulation med hjälp av en batteridriven pump 6. Vattentanken 3 utgör kylreserv för att med hjälp av värmeväxlaren kyla rummet i fall luftkonditioneringsanläggningen, exempelvis till följd av strömbortfall, skulle upphöra att fungera. Under normaldrift dvs när luftkonditioneringsanläggningen är i gang kyls vattnet i tanken, sa att dess temperatur ligger nära lufttemperaturen i rummet dvs 250. 8405560-7 10 15 20 25 pipeline is connected to a heat exchanger 5. The water is kept in circulation by means of a battery-powered pump 6. The water tank 3 constitutes a cooling reserve for using the heat exchanger to cool the room in case of air conditioning, for example due to power failure, would cease to function. During normal operation, ie when the air conditioning system is running, the water cools down tank, said that its temperature is close to the air temperature in the room ie 250.

Vid bortfall av den normala kylningen övertar värmeväxlaren 5 kylninge- funktionen sa länge vattnet i tanken ej har uppnatt en förutbestämd tempera- tur. Om man väljer denna temperatur exempelvis till 1:00 maste vatten- behallaren dimensioneras pa sadant sätt att denna temperatur uppnas efter ett visst antal, exempelvis 8 timmar. För en lokal av exempelvis 50 m3 volym i vilken det utvecklas en förlusteffekt pa 4 kW kan enligt beräkningar vara ett lämpligt värde 1,5 m3 vattenvolym. Denna lösning är lämplig om den yttre temperaturen är sa hög, att den praktiskt taget aldrig sjunker under den avsedda rumstemperaturen som i vissa tropiska länder. Anläggningen kan emellertid kompletteras enligt fig 2 för att utnyttja omgivningens temperatur om denna åtminstone under vissa perioder faller under den avsedda rums- temperaturen.In the event of failure of the normal cooling, the heat exchanger 5 takes over the cooling function as long as the water in the tank has not reached a predetermined temperature lucky. If you select this temperature, for example until 1:00, the water the container is dimensioned in such a way that this temperature is reached after one certain number, for example 8 hours. For a room of, for example, 50 m3 volume in which develops a loss power of 4 kW can according to calculations be one suitable value 1.5 m3 water volume. This solution is suitable if the external the temperature is so high that it practically never drops below it intended room temperature as in some tropical countries. The facility can however, is supplemented according to Fig. 2 to take advantage of the ambient temperature if, at least for certain periods, it falls within the intended space the temperature.

Fig 2 visar en sadan anläggning som utom luftkonditioneringsanläggningen 1 och värmeväxlaranläggningen 3 - 6 även omfattar en av den yttre luften kyld värmeväxlare 7 som över en rörledning 8 är ansluten till vattentanken 3 parallellt med rörledningen 4 och arbetar med självcirkulation enligt termo- syfonprincipen. Om man sätter rumstemperaturen till 25° som i förra fallet, innebär detta att kylkretsen 7 - 8 ger bidrag till vattentankens 3 kylning och härigenom kan man spara energi da luftkonditioneringsanläggningen under vissa perioder kan arbeta med lägre effekt eller helt stoppas. Pa detta sätt behöver luftkonditioneringsanläggningen endast vara i funktion da rummets temperatur pa brist av yttre kylning ökat över 250.Fig. 2 shows a system such as the air conditioning system 1 and the heat exchanger system 3 - 6 also comprises one cooled by the outside air heat exchanger 7 which is connected via a pipeline 8 to the water tank 3 parallel to the pipeline 4 and works with self-circulation according to thermo- the siphon principle. If you set the room temperature to 25 ° as in the previous case, this means that the cooling circuit 7 - 8 provides a contribution to the cooling of the water tank 3 and this can save energy as the air conditioner under some periods can work with lower power or completely stopped. In this way need the air conditioning system should only be in operation when the room temperature due to lack of external cooling increased over 250.

Claims

1D 8405560-7 CLAIMS Refrigeration system comprising a heat exchanger (S) connected to a liquid container (3) whose contents are normally kept close to room temperature by means of a cooling unit (1) and in the event of failure of the cooling unit the liquid of the liquid container circulates through a heat exchanger harmful temperature increase occurs in the room (2), characterized in that an auxiliary cooling system operating according to the thermosyphon principle comprising a heat exchanger (7) which is cooled by the outside air and is connected in parallel to said first heat exchanger (5) to the liquid container (3) arranged in such a way that the auxiliary system comes into operation as soon as the outdoor temperature has dropped below a value corresponding to the desired air temperature at the same time as the cooling unit is switched off, while the cooling unit eats is switched on when the temperature of the liquid container (3) rises above a certain limit.