SU881515A1 - Heat pipe - Google Patents

Description

one

The invention relates to heat engineering, in particular to devices for heat transfer in solar installations, and can be used in many areas of the national economy for the transfer of heat between different objects.

Heat pipes are known that contain an evaporator and a main condenser located under it, connected by a transport section, a condensate collector installed above the evaporator and connected to it by means of a siphon, a tank placed above the evaporator and connected to the main condenser, and an auxiliary one. capacitor l}

However, in the known heat pipe, i; 4eT circulates superheated steam through the evaporator path — auxiliary condenser — condensate collector — siphon tube, the reliability of the heat pipe operation decreases. It. occurs as follows. During the period of condensate return, superheated steam, a circular evaporator through the path - auxiliary condenser condensate collector - siphon tube - evaporator, partially condensed in the auxiliary condenser and condensate collector, heats the walls of the latter and the condensate, raising its temperature. An increase in the condensate temperature leads to the intensification of the evaporation process from the open condensate mirror, to a decrease in the rate of pressure drop in the thermally filled cavity

10 tubes due to condensation in the auxiliary condenser. This significantly increases the time of return of condensate to the evaporator and the danger of overheating of the evaporator. In this way, in this heat pipe there is a harmful heating of the condensate during the period of its return due to the condensation of superheated steam entering the condensate collector from evaporation bodies. In addition, the temperature of the walls of the condensate collector is reduced by an auxiliary condenser located above the condensate collector, with a low coefficient

25 steam heat transfer, which slows down the rate of condensate temperature decrease, the rate of saturated vapor pressure decrease in the condensate collector and the condensate return rate

30 in the evaporator.

 invention - improving the reliability of the heat pipe.

The goal is achieved by the fact that in a known heat pipe containing an evaporator and a main condenser located beneath, connected by a transport section, a condensate collector installed above the evaporator and connected to it by means of a siphon, a tank placed above the evaporator and connected to the main condenser, and an auxiliary condenser, a condensate collector is installed inside the auxiliary condenser, and a siphon is connected to the collector in its lower part with the formation of a water trap.

The drawing shows schematically the proposed heat pipe.

The heat pipe contains the evaporator 1, the main condenser 2, connected by the transport section 3, the condensate collector 4, the siphon 5, the reel b, the auxiliary condenser 7, the hydraulic lock 8 (hydraulic lock).

Heat pipe works as follows.

Before starting the pipe, all the condensate from the condensate collector 4 goes through the siphon 5 to the evaporator 1. At the same time, the siphon 5 is open to allow steam to pass. When heat is supplied to the evaporator 1, the condensate begins to evaporate, the vapor pressure in it rises and the vapor pressure in the reservoir 6 exceeds the vapor pressure. As a result, the condensate is displaced by steam from the transport section 3 and condenser 2 to reservoir 6 (Fig. 3). In the period of displacement of the coolant from the transport section 3 in the condensate collector 4 and the siphon 5 partial vapor condensation occurs. The condensate, filled with the hydraulic shutter 8, closes the path of the steam through the evaporator path 1, condensate collector 4 — siphon 5. The heat transfer process by the heat pipe continues until all condensate evaporates from evaporator 1.

The vapor condensed in the auxiliary condenser 7 reduces its pressure. Under the force of gravity, the condensate begins to flow into the condenser 2, the transport section 3 and the condensate collector 4. At the time of post condensate condensate collection 4, due to the presence of a hydraulic valve 8 superheated, in the evaporator 1 steam does not enter the condensate collection 4 and therefore heating

condensate due to superheated steam does not occur. .

The device of the hydraulic shutter 8 on the siphon 5 makes it possible to prevent the overheated steam from the evaporator 1 from entering the condensate collector 4 during the period of return of the coolant to the evaporator 1, to exclude additional heating of the walls of the collector 4 and the coolant condensate

 significantly reduce the period of return of the coolant and reduce the overheating of the evaporator 1. Attaching the end of the siphon 5 to the bottom of the condensate collector 4 reduces the time required for the hydraulic valve 8 to form due to the condensate formed in the condensate collector 4.

Installation of the collection of 4 condensate. inside auxiliary capacitor

0 7 allows you to speed up the process of cooling the walls of the collector 4 and the condensate, reduce the pressure of saturated steam and the time to reduce the last condensate in the collector 4 and reduce the time

5 of returning condensate to the evaporator 1, thereby reducing the superheat of the latter, and placing the condensate collector 4 inside the transport section 3 allows reducing the pressure of the saturated steam in collection 4

0 condensate by cooling the condensate in the auxiliary condenser 7 with a constantly high heat transfer coefficient during the entire period of stay of the condensate in its area of operation, i.e. 10% increase the efficiency of the heat pipe.

Claims (1)

1. USSR author's certificate No. 726409, cl. F 28 O 15/00, 1978.