KR19990046156A - Passive cooling system - Google Patents

Abstract

Passive cooling is to maintain a constant temperature of electronic equipment that generates heat in a confined space. The principle is as follows. At night, when the outside air temperature is lower than the room set temperature, the working liquid cooled by the outside air is brought into contact with the liquid phase change material stored in the room to give out the heat of melting and solidify. On the other hand, if the room temperature rises above the set temperature during the day, the solidified phase change material melts and absorbs heat to prevent excessive rise of indoor electronic equipment. This is called a regenerator, and the latent heat of the heat storage medium is small in volume and excellent in performance compared to the ordinary sensible heat regenerator. In addition, the manual air conditioner has the advantages of low power consumption, quietness and a very low probability of failure, compared to the conventional electronic equipment chiller using a mechanical freezer. To properly design and install this device, the following prerequisites must be met.

First, the indoor set temperature should not be lower than the daily ultra low temperature. This condition is based on the second law of thermodynamics.

Second, the size of the phase change material, which is a heat storage medium, should be large enough to handle the daily heat load.

Third, the heat dissipation capacity at the lowest daily temperature should be divided so that it can dissipate daily heat load in a short time.

Fourth, additional equipment such as heat insulation and zener should be properly provided.

Description

Manual Air Conditioning System {PASSIVE COOLING SYSTEM}

The present invention

◎ Independent magnetic conditioning without external power (temperature and relative humidity control)

◎ Reduced maintenance and related costs

Operates under conditions of high heat dissipation from residential electrical and electronic equipment.

◎ Does not cause extremely high MTBF.

◎ Eliminate all contaminants (such as smoke from Freon gas `` CFC '' mixture engines) The objective is to invent a manual air conditioner for continuous temperature and humidity control.

The present invention uses AIR CONDITIONERS, HEAT EXCHANGER as a heat exchanger for SHELTER, OUT DOOR RACK, CABIENT, EQUIPMENT HOUSING, etc., which are enclosures of a communication equipment system. There was a problem that the electricity consumption is high, the A / S is difficult, and the sudden occurrence that does not cause during mountainous power outage occurs.

Magnetic or manual conditioning systems enable enclosed environmental temperature control and associated humidity control and control residential heat to operate electrical and electronic devices without the use of cooling air conditioning systems and with greater reliability than equipment reliability specifications. It is a special thermal device. This cooling technology eliminates the need for replacement, no energy costs, and no maintenance personnel and costs. There is no power assistance and no air exchange for cooling.

The main components of this thermal conditioning system are:

R = thermal resistance (or Celter insulation)

T = heat transistor (or heat exchanger) that dissipates heat generated by the equipment to the outside environment

C = thermal capacitance (or heating medium) to store heat that stores heat dissipated by the device

The operating principle of this chiller is very simple. At some point on the day when the external temperature is higher than the internal Celter temperature table 1, the T device remains unchanged and the thermal energy W is absorbed by the C device. A special high efficiency change absorbs and stores this energy W which eliminates the increase in internal temperature. When the external temperature becomes lower than the internal selter temperature, the Table 2 T device begins to dissipate the heat accumulated from the installation to the external environment. On the other hand, the C device is automatically recharged. This natural phenomenon is caused by a special organic heat transfer flow system using the difference in gravity and density. The results of the self-conditioning system for one time period are described in Table 3.

SECTION A-A is a side view

SECTION B-B is the front view

SECTION C-C is P.C.S

* Explanation of symbols for the main parts of the drawings

(SECTION C-C) ⑩PASSIVE COOLINGSYSTEM (P.C.S)

Without the heat load, the evaporator fills up and spreads in the pipe when the vapor pressure drops. Under the heat load, the evaporator section rises in temperature and vapor pressure and pushes water from the evaporator towards the condenser. When the pipe is running at maximum volume, the water collects at the end of the condenser and reservoir. Therefore, during operation, the length of the condenser changes with the heat load and the operating temperature of the pipe does not change significantly even if the heat load or the environment of the heat exchange is changed. Even under extreme adverse conditions, a small amount of waste heat can be supplied to the evaporator to keep the pipe above freezing temperatures.

Capillary effect- Gravity head = liquid pressure drop + meteorological pressure drop

Effective distance of pipe The equilibrium is established by a one-dimensional assumption that is the distance from the center of the evaporator to the center of the condenser. Gravity Head Is 0 for horizontal pipes and becomes negative if the condenser is located above the evaporator. Pressure drop and The heat load increases with increasing flow rate and therefore the required capillary head Will also increase. However, the maximum capillary pressure available for a given liquid-wick bond ( max) and for the heat pipe to operate continuously, the required capillary pressure must not exceed this value at any point in the pipe. In this case, an evaporator burnout condition occurs in which the wick is completely dried out and the load must be reduced for recovery. Gravity head is the hydrostatic pressure difference between the evaporator and the condenser and may be negative depending on the given conditions.

Gravity chickenpox when is

○ liquid pressure drop

The pressure drop required while the liquid flows through the wick from Darcy's law.

This equation is for the flow through the porous medium, where m [kg / s] is the permealbility of the wick as given in Table 1.1 where the liquid flow rate is [m ² ].

The pressure drop when the working medium flows through the grooves

As the steam velocity increases, the steam drag impedes the flow of liquid through the grooves. The problem is solved by placing a wire mesh on the surface of the grooves.

Magnetic or manual conditioning systems enable enclosed environmental temperature control and associated humidity control and control residential heat to operate electrical and electronic devices without the use of cooling air conditioning systems and with greater reliability than equipment reliability specifications. It is a special device. This cooling technology does not require replacement, no energy costs, and no maintenance personnel and costs. There is no power assistance and no air exchange for cooling.

Claims (1)

The cooling unit manages cold / hot by changing phase due to the difference of gravity and density, and the capillary pressure of pipe (PCS) ) may is not larger than gravity head, and the wire mesh is inserted into the groove of the pipe to facilitate the liquid flow.The pipe is vacuumed and the Merit water of the working liquid is made of pure water.