Flow regulator for cooling unit of self-container conditioner

FIELD: cooling equipment, particularly to control coolant flow.

SUBSTANCE: flow regulator is formed of capillary tubes serially connected one to another and having different inner diameters and lengths. The capillary tubes are arranged so that capillary tube having greater diameter is installed before one having lesser diameter in direction of coolant flow from cooling unit condenser.

EFFECT: increased efficiency of cooling unit operation in cooling and heat pump regimes, as well as simplified manufacturing and computation.

2 dwg

 

The invention relates to refrigeration and can be used to control the flow of the cooling agent.

Known flow regulators for refrigeration machines offline conditioning, representing the capillary tube is installed between the condenser and the evaporator in the direction of the refrigerant and performs two tasks: lowering the pressure of the liquid refrigerant and the regulation of its flow through the cooler.

The capillary tube is the easiest flow regulator of the refrigerant. The flow of liquid through a tube is proportional to the difference between the pressure of condensation and boiling in the system, which in turn determines the geometrical characteristics of the capillary tube (diameter and length). For optimum operation of the refrigeration machine with a capillary tube in the cooling mode and in the mode of a heat pump, as a rule, use two capillary tubes. Moreover, the resistance of the capillary tube to ensure the heat pump mode is greater than the cooling mode.

Therefore, Autonomous air conditioning, for which the cooling operation is basic, the capillary tube is made of such length as is necessary for optimal cooling. For optimal operation in a heat pump is that the capillary tube is added additional handset with a check valve. Moreover, the total hydraulic resistance of the two tubes is optimal to ensure the operation of the heat pump [1].

The disadvantage of flow regulators is their complexity due to the use of two capillary tubes and check valves for flow of refrigerant or through one capillary tube, or through two consecutive capillary tube.

Known regulators of flow of the refrigerant to the refrigerating machine offline conditioning, consisting of two capillary tubes with two biperidene valves and placed after the condenser and downstream of the evaporator [2]. The drawback of such regulators is their complexity.

Known flow regulator refrigerant for refrigerating machines offline conditioning, representing a capillary tube having a different resistance depending on the direction of refrigerant [2]. This capillary tube having nozzles for supplying liquid refrigerant and drainage of the liquid-vapor mixture, the length is made with evenly spaced waists and bent in the form of a loop with a location intersecting with its inner side, while the nozzles supplying liquid refrigerant and drainage of the liquid-vapor mixture is installed with the possibility of a counter move.

The disadvantage of this technical solution is it is the complexity.

Known flow regulator refrigerant for refrigerating machines offline conditioning, consisting of two capillary tubes with two biperidene valves and placed after the condenser and downstream of the evaporator [3]. The disadvantage of this controller is the complexity of its manufacture and settings.

The aim of the invention is the creation of a flow regulator that provides high efficiency chillers in the cooling mode, and in the heat pump mode when the ease of fabrication and processing.

This objective is achieved in that the flow regulator for refrigerating machines offline conditioning made of series-connected two capillary tubes, oriented in such a way that the first movement of the refrigerant from the condenser of the refrigeration machine is installed tube of larger diameter, and then a smaller one.

1 shows a diagram of the flow regulator for refrigerating machines offline conditioning.

Figure 2 shows theoretical change of fluid pressure along the length of the capillary tube on the basis of the results given in (4) and based on the authors ' calculations.

The flow regulator consists of a capillary tube 1 with a diameter of D1and length l1connected in series (for example, using the clutch) with capillary trubka the 2 smaller diameter D 2and length l2. And the pipes enter and exit the supercooled liquid. The flow regulator is installed between the condenser and the evaporator of the refrigeration machine.

The work of the proposed regulator is as follows.

During operation of the refrigeration machine supercooled liquid from the condenser through the pipe And the capillary tube of diameter D1and length l1(the x direction), connected in series, for example, by using an intermediate coupling With capillary tube of diameter D2and length l2. In these capillary tubes is a decrease in the pressure of a moving fluid from the condensing pressure (pto) of the refrigerant in the condenser to the evaporating pressure in the evaporator (R0) at the exit of the nozzle C. the pressure Drop in the flow regulator will be Δpx.

When operating in heat pump mode, supercooled liquid enters the regulator through the pipe In (direction T) - first in the capillary tube of diameter D2and length l2and then in a capillary tube of diameter D1and length l1. The pressure drop in this case isΔpt. And Δpt>Δpxthat meets the requirements of the regulator to ensure the effectiveness of self is about conditioning. Let us consider in some detail the process of throttling of the liquid in the capillary tube (figure 2).

At the entrance to the capillary tube is a slight pressure drop due to losses in sudden contraction pressure ptoto pressure p1. Further to the point With the pressure drop is linear to pressure p2and pressure p2is the saturation pressure of the supercooled liquid. At the point the liquid is in the saturation state, and begin to form vapor bubbles. Increases the movement speed of the liquid-vapor mixture. Starting from the point s to the end of the tube pressure drop is not linear in nature and increases sharply as it approaches the end of the tube.

A sharp drop in pressure from p3up to R0at the exit of the capillary tube is possible only when the pressure in the cooler is less than a critical (which can be achieved critical sound speed).

In the course of numerous calculations of the lengths of capillary tubes has been observed that the long section of the tube (a-C) are necessary to ensure the pressure drop of the refrigerant to the value corresponding to the saturation state (pressure p2).

Accordingly, the tube length l1is calculated from the pressure difference from ptoup to R2and tube length l2 - on the basis of the pressure difference from p2to the desired value of p0. Thus, in cooling mode, the flow regulator is oriented such that the first refrigerant enters the area with the capillary tube, for example with a diameter of 1.7 mm, and then in a plot with an inner diameter of 1.6 mm In the heat pump mode, Vice versa.

In the calculation of the flow regulator that uses two series-connected capillary tube with a diameter of 1.7 and 1.6 mm, the following results are obtained.

The estimated length of section with an inner diameter of 1.7 mm was 795 mm and with an inner diameter of 1.6 mm - 279 mm

On the basis of these calculations was made the sample flow regulator for household air conditioner production Elemash, Elektrostal), and comparative tests were performed on the plant calorimetric stand. In mass air flow regulator is a main capillary tube with a diameter of 1.7 mm, length 1070 mm and more in diameter 1.7 mm, length 908 mm In the test result obtained to increase the cooling capacity 2.45 kW to 2.58 kW, and the heat output from 2,73 kW to 2.77 kW.

To confirm the effect of the proposed flow regulator was prepared a second sample, consisting of two capillary tubes with a diameter of 1.7 mm 795 mm and a diameter of 142 mm, length 93 mm

The result of conditioning the resulting increase in the cooling capacity to 2,81 kW and a heating capacity of up to 2.8 kW.

The analysis of the experimental results shows a clear improvement of thermal performance of the refrigeration machine offline conditioning with considerable simplification of the structure of the flow regulator due to the exclusion of the refrigerating machine valve and reducing the total length of the capillary tube.

Literature

1. Ventilation and air-conditioning. Theory and practice. - M, euroclimate, Izd-vo Arina, 2000. - 416 S.

2. A.S. No. 1267135 Published 30.10.86. Bull. No. 40.

3. Pat. U.S. No. 5634352, publ. 03.06.1997,

4. Elagin M. a Mathematical model for the calculation of capillary tubes // Refrigerating equipment. - 1984, No. 7. - P.39-40.

The flow regulator for refrigerating machines offline conditioning, containing two capillary tubes, wherein the tubes are connected in series and oriented in such a way that the first movement of the refrigerant from the condenser of the refrigeration machine is installed tube of larger diameter, and then a smaller one.



 

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