The cooler

 

(57) Abstract:

Usage: in air conditioning systems, mainly vehicles. The inventive cooler contains at least one multi-channel flat tube 1 with outer fins 2, is connected to the input and output manifolds 3, 4, respectively. Pipe 1 provided with a heat-generating element 6, which is placed in one of its channels 5, for example, on average, the pipe 1 may be provided with an additional heat-generating element 6, and thus fuel elements 6 are placed at the channels of the pipe 1, the outer wall of each extreme of the channel 5 of the tube 1 along its entire length can be performed longitudinal slot. 3 C.p. f-crystals, 4 Il.

The invention relates to refrigeration and can be used in air conditioning systems, mainly vehicles.

Known cooler, consisting of along the air flow sections, composed of parallel to each other in a number of plate fin and tube for refrigerant inserted in the above-mentioned ribs at right angles. Between sections made certain period, within which is placed testi evaporator frost (Japan's bid N 3-41749, CL F 25 B 47/02, F 25 D 21/08).

However, this cooler has a low heat transfer capability due to the use of single-channel tubes, and therefore large dimensions compared to coolers, made of multi-channel flat tubes. The presence of a fuel element in this cooler increases the intensity of the process of thawing frost during its operation, however, when the above placement of the fuel element is sufficiently large thermal resistance between the surfaces of these elements, and heat exchanger tubes, resulting in increased electricity costs and time for defrosting frost.

Known the cooler containing the coil in the form of multi-channel pascavale pipes connected to the input and output manifolds, provided with at least one mixer, common to all channels (ed. St. USSR N 1267133, CL F 25 B 39/02, 1986, B N 40). This cooler is compact, has a sufficiently high efficiency of heat transfer, but in the process of operation, if necessary, thawing of frost requires large expenditures of time and electricity to drive the compressor Widia, in such cases, produced by the discharge of the compressor in the cooler the hot steam of the refrigerant bypassing the condenser.

The purpose of the invention to develop a compact cooler with high heat transfer capability, requiring a minimum investment of time and energy for defrosting the frost, and also easy to manufacture and convenient in operation, and reduced thermal resistance between the heat exchange surface and the frost when it is defrosting.

The objective is achieved by the fact that in the cooler that contains at least one multi-channel flat tube with outer fins connected to the input and output manifolds, according to the invention, the said pipe is provided with a fuel element placed in one of its channels; fuel element is placed in the middle channel of the pipe; the multi-channel tube provided with an additional heat-generating element; and these fuel elements placed in its extreme channels in the outer wall at each channel of the pipe along its entire length is made a longitudinal slot.

The presence of the fuel element, and its time is tyuleniy heat exchange between the surface and the frost when it is defrosting due to the direct heating surface of the pipe.

During defrost the evaporator hot vapour refrigerant pumped by the compressor to the evaporator, bypassing the condenser, in the channels of the cooler is a heat exchange between the vapor and the wall of the pipe. The heat transfer coefficient of this heat transfer is small (about 50 W/m2K), and hence the component of thermal resistance of heat transfer between the vapor refrigerant and the frost on the outer fins very large. This ultimately leads to the need for additional time and electricity to drive the compressor.

The placement of the fuel element directly in the channel of the multichannel tubes eliminates component convective heat transfer from vapor refrigerant, which reduces the total thermal resistance, which ultimately leads to the reduction of energy consumption and time defrost frost.

By placing heat-generating element in the middle channel of the multichannel tubes in that case, if the latter is equipped with only one mentioned element, there is a uniform distribution of the heat flow from the latter in the transverse direction from the middle of the pipe to its edges, contributing to the implementation of time for defrosting frost.

The supply pipe additional fuel element and placing each fuel element in one of its extreme feeds also promotes uniform distribution of the heat flux from the mentioned elements from each edge of the pipe to the middle of it, but due to the presence of additional fuel element amplifies the intensity of the heat flux, and consequently, the more reduced the time needed for defrosting frost.

Execution of longitudinal slots in the outer wall of the outermost channels of the pipe increases the manufacturability of the air cooler, and increases the convenience of operation by facilitating the extraction of the fuel element from the channel and its installation in the last failure and the need for its replacement.

In Fig.1 presents the cooler, made in the form of a coil; Fig. 2, a cooler, made a series of flat tubes United by a common inlet and outlet manifolds; Fig.3 pipe cooler with placement of the fuel element in the middle channel of the pipe, the cross section of Fig. 4 is the same, with slots in the outer walls of the extreme channels and two fuel EU in the form of a coil tube 1 (Fig.1) or multiple parallel one above the other rectangular multi-channel tube 1 (Fig.2), provided with an outer fins 2. Each pipe 1 is connected to input 3 and output 4 to collectors. The pipe 1 has a longitudinal channels 5, the average of which (Fig.3) or the two extreme (Fig.4) posted fuel elements 6, which are made in the form of a flexible electric heaters. For ease of installation and replacement of fuel elements in case of failure in the exterior walls of the extreme channels 5 of the pipe 1 along the entire length of the last executed longitudinal slits.

The air cooler works as follows.

The liquid refrigerant from the condenser of the refrigeration machine is choked in the control valve and enters through an inlet manifold 3 into the tube of the cooler 1. In the channels 5 of the pipe 1 is a refrigerant. The resulting steam through outlet 4 outlet absorbed by the compressor of the refrigeration machine. Passing the outer fins 2, the air is cooled, the surface of the fins is formed frost. Upon reaching a sufficiently large layer of frost, which reduces the efficiency of heat transfer, refrigeration compressor turns off and turns on the electric heater 6 is placed in one or two channels of the pipe. The surface of the pipe heats up quickly, frost thaws out and beats the ASS="ptx2">

Thus, the present invention can significantly reduce electricity costs and time for defrosting frost during its operation. In addition, the installation of electric heaters directly into the channels of the multichannel tubes eliminates additional equipment that is required to enter into the scheme of the refrigeration machine in case of defrosting frost steam, namely, solenoid valves, steam piping, accumulator, which ultimately increases the reliability of the refrigeration machine.

1. The cooler that contains at least one multi-channel flat tube with outer fins connected to the input and output manifolds, characterized in that the said pipe is provided with a fuel element placed in one of its channels.

2. The cooler under item 1, characterized in that the fuel element is placed in the middle channel of the said pipe.

3. The cooler under item 1, characterized in that the said pipe is provided with additional fuel element, these elements are located in its extreme channels.

4. The cooler under item 1 or 3, characterized in that Nar is

 

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