SU1188500A1 - Recuperative heat exchanger - Google Patents

Abstract

1. RECOVERABLE HEAT EXCHANGER containing hot and cold heat transfer ducts in the case, which are separated by heat exchange baffles with spacers fixed between them, which is equipped with inserts with variable thermal resistance along their length, made with end grooves, and the inserts are installed from the side of the entrance to the body of the cold heat carrier, are connected with face grooves butt with heat transfer partitions and locked in the housing. and the thermal resistance of the inserts decreases along the cold coolant in the following relationship: ({RT 06, tr () l oi, where R is the thermal resistance of the inserts; t, t2 are the local temperatures of the hot and cold heat carriers, respectively;, itvJj are local heat transfer coefficients respectively from the side of hot and cold heat carriers; (L t (p is the temperature of the phase transition of the hot coolant; At is the temperature difference between the given surface temperature of the insert and the temperature of the phase transition of the hot coolant 00 00 C / 1 2. The heat exchanger according to claim 1, about t is characterized by the fact that the inserts are made of at least two parts having different variable thermal resistance along their length.

Description

The invention relates to heat exchange engineering and can be used, in particular, in air conditioning systems and in heat exchangers-heat exchangers.

The purpose of the invention is to increase the operating efficiency of the recuperative heat exchanger by preventing the hot coolant phase transition.

FIG. 1 is a schematic diagram of a recuperative heat exchanger; FIG. 2 is a section A-A in FIG. I.

The recuperative heat exchanger contains hot and cold heat transfer channels 2 and 3 located in housing J, which are separated by a heat exchanger partition 4 with spacers fixed between them 5. The heat exchanger also contains inserts 6 with variable thermal resistance along their length, made with end slots 7. Inserts 6 are installed on the side of the entrance to the housing 1 of the cold coolant, are connected by end grooves 7 butt to heat exchange walls 4 and are designed as their continuation. In the case, the inserts 6 can be fixed, for example, using figured longitudinal gaskets 8 and tie rods 9. Heat exchange walls 4 can be fixed in body J using longitudinal gaskets 10 and studs 9. The heat exchanger also includes inlet and outlet nozzles 1I 12 and 13, 14 respectively hot and cold heat carriers. Between the heat exchange walls 4 and the inserts 6, transverse gaskets 15 are installed, which alternately separate the inlet and outlet pipes I, 12 and 13, through one air channel. Inserts 6 can be made of at least two parts with different distilled thermal resistance along their length.

The thermal resistance of the inserts 6 decreases along the cold coolant in the following relationship:

t,

() oil z

where 1 is thermal resistance

inserts;

, 2 local temperatures, respectively, of hot and cold heat carriers; cx iXz, local heat transfer coefficients, respectively, from the side of hot and cold heat carriers; s-w is the phase transition temperature of a hot heat carrier;

& t.

temperature difference between the set surface temperature of the insert and the phase transition temperature of the hot coolant. A variable in length thermal resistance of the insert 6 is achieved by making it with a variable thickness. With the observance of the above dependence of the change in thermal resistance fi-p of the insert 6 during the cold heat carrier

l surface temperature up -

BOK is superior to the hot transition phase transition temperature. Regenerative heat exchanger works as follows.

Hot and cold heat carriers are supplied to the inlet pipes 11 and I3, respectively. With the passage of hot and cold heat carriers inside the case between the heat exchangers

the partitions 4 and the inserts 6 carry out the heat exchange process without the phase transition of the hot coolant, because throughout the heat exchange partitions 4 and the inserts 6 their surface temperature exceeds the temperature of the phase transfer of the hot coolant. After the process of heat exchange between hot and cold heat transfer fluids

through heat exchange walls and inserts 6, heat transfer fluids through the corresponding outlet pipes 12 and 14 are taken out of the heat exchanger. When changing the parameters of the cold coolant, insert 6 is replaced and another interchangeable insert is installed with the required thermal resistance.

Change in thermal resistance

Laziness can also be accomplished by adding additional removable inserts 6, butt-mounted with a main insert (inserts 6.

na10 9

1

15 13 i /

/

Claims (2)

1. RECOVERABLE HEAT EXCHANGER containing channels of hot and cold heat carriers located in the casing, which are separated by heat exchange partitions with gaskets fixed between them, characterized in that, in order to increase work efficiency by preventing phase transition of the hot heat carrier, it is equipped with inserts with variable thermal resistance along their length, made with end grooves, and the inserts are installed on the side of the entrance to the cold coolant body, the ends are connected E grooves butt with baffles and heat exchanger are fixed in the housing, and inserts the thermal resistance decreases along the cold coolant in the following relationship: ^T OS ₍ [bg (-bcr -Af) 3 'where R _T is the thermal resistance of the inserts; t ^, t ₂ - local temperatures, respectively, of hot and cold coolants; ot, iOZ ₂ - local heat transfer coefficients from the hot and cold coolants, respectively; ίφ is the phase transition temperature of the hot heat carrier; At is the temperature difference between a given temperature of the surface of the insert and the temperature of the phase transition of the hot coolant. 2. Heat exchanger according to π. 1, about t - characterized in that the inserts are made of at least two parts having different variable thermal resistance along their length. . SU 1188500 ϊ