Finned heat exchanger

A/C evaporator,Crane oil cooler,diesel radiator

Design originates from customer needs and provide customization;
Dispatch technician attend on board to collect the necessary technical parameters, to ensure the production’s size & performance match with main equipment.
Provide upgrading or retrofitting of new product solutions for your heat exchanger through accurate thermal calculation;
Meet the requirements of the classification society and other third party specifications;
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01A/C evaporator

Working principle:

The function of the air conditioning evaporator is to make use of the fact that the liquid cryogenic refrigerant is easy to evaporate under low pressure, convert into steam and absorb the heat of the cooled medium, so as to achieve the refrigeration purpose. It relies on the fan to force the air in the warehouse to flow through the cooling exhaust pipe in the box for heat exchange, so as to cool the air, thus achieving the purpose of reducing the warehouse temperature. Among them, the refrigerant or refrigerant carrier flows in the exhaust pipe and cools the air outside the pipe through the pipe wall, which is called dry air cooler; It is called wet air cooler if the sprayed refrigerant liquid directly exchanges heat with air; In addition to the cooling exhaust pipe, the mixed air cooler also has a refrigerant carrier spray device.

According to the type of cooling medium, evaporators can be divided into two categories:

(1) An evaporator that cools liquid refrigerant. It is used to cool liquid refrigerant - water, brine or glycol aqueous solution. Such evaporators are commonly used as horizontal evaporators, vertical tube evaporators and spiral tube evaporators.
(2) Evaporator for cooling air. This type of evaporator has cooling exhaust pipe and cooling fan.

Evaporator technology application in air conditioning

Finned coil evaporator is usually used in air conditioners, which is made by expanding fins on S-shaped copper tubes. Generally, the thickness of fins is about 0.12-0.2mm. The role of fins is to increase the heating area to strengthen the air disturbance and improve the heat transfer efficiency of the evaporator. The evaporator is a forced convection evaporator, which needs to rely on the wind wheel to accelerate the air flow in a forced convection way to complete the heat exchange. It has the characteristics of firmness, high reliability and good heat exchange performance. The evaporator is located in the air-conditioning refrigeration system. After throttling and depressurization, the refrigerant liquid absorbs heat and vaporizes in the evaporator, becoming a low-pressure saturated vapor, thus reducing the temperature of the surrounding air and achieving the refrigeration effect. According to different structures, fins can also be divided into flat fins, corrugated fins, and impact fins. Because the heat transfer efficiency of flat fins and corrugated fins is relatively low, at present, the fins of air-conditioning evaporators are mostly impact fins, which will cause air to move around in the fins, thus greatly increasing the air disturbance and agitation effect and maximizing the heat transfer efficiency.

02Crane Lub. oil cooler

Almost all the power loss in the hydraulic system is converted into heat, causing the hydraulic oil’s temperature rise. In order to control the temperature of hydraulic oil, on the one hand, efficient components should be used to reasonably design the system to minimize the power loss of the hydraulic system; On the other hand, measures should be taken to dissipate the heat generated in the system. Generally, the heat dissipation through the oil tank cannot meet the requirements, so a cooler must be set in the hydraulic system. There are three types of coolers commonly used in hydraulic systems: water-cooled, air-cooled and refrigerant. The disadvantages of traditional water-cooled cooler are its complex structure and low cooling efficiency.

In order to solve the problems above statement, we carried out research and improvement the technology. The oil cooler we developed is characterized by simple structure, high heat transfer efficiency and good cooling effect.

03Diesel engine radiator

Radiator is an important component of diesel generator cooling system, and its heat dissipation ability determines the effect of cooling system to a large extent. It is a heat exchange device to eliminate the high heat that occurs in the long running of the machine, so as to prevent the generator from overheating and causing faults, and ensure that the engine works continuously in the normal temperature range. The principle of radiator is to use the cooling liquid to lose heat energy to work, in order to ensure the proper temperature of the internal combustion engine, the cooling water to lose heat energy is indispensable. Normally, the water pump driven by the engine circulates the cooling water to all parts of the engine. The coolant absorbs the heat generated by the engine and releases it into the air.

Basic structure: radiator by water chamber, water chamber, radiator core, etc. When choosing the material, main consideration is the following should be considered :heat transfer performance is good, corrosion resistance is strong, have enough strength, have good brazing performance, easy processing molding and good economy. The basic performance of the radiator is characterized by the various temperatures and heat before and after the heat exchange between the air of the low-temperature fluid and the water of the high-temperature fluid. It is determined by the temperature of the air and water at the entrance of the radiator, the whole heat dissipation area of the radiator, the heat transfer rate, the temperature of the fluid (air, water) when the heat is absorbed by the air, the temperature of the heat released by the water, and the heat released by the water (the heat absorbed by the air). The heat release and the required target temperature is the basis of determining the basic performance of the radiator.

Working principle:

The engine generates a lot of heat during operation. In order to protect the normal operation of the engine and improve the gasoline combustion rate, certain cooling methods must be used to reduce the engine operating temperature when the engine reaches a certain operating temperature.
In the cylinder block of the engine, there is a water channel for cooling water circulation, which is connected with the radiator at the front through the water pipe to form a large water circulation system. At the upper outlet of the engine, there is a water pump, which is driven by the fan belt to pump out the hot water in the water channel of the engine block and pump in the cold water. In this way, the coolant circulates in the engine cylinder liner and between the radiators.
Almost all the power loss in the hydraulic system is converted into heat, causing the hydraulic oil’s temperature rise. In order to control the temperature of hydraulic oil, on the one hand, efficient components should be used to reasonably design the system to minimize the power loss of the hydraulic system; On the other hand, measures should be taken to dissipate the heat generated in the system. Generally, the heat dissipation through the oil tank cannot meet the requirements, so a cooler must be set in the hydraulic system. There are three types of coolers commonly used in hydraulic systems: water-cooled, air-cooled and refrigerant. The disadvantages of traditional water-cooled cooler are its complex structure and low cooling efficiency.

There are two circulation modes:

When the internal temperature of the engine (i.e. cold engine ) does not reach the default working state of the thermostat (generally determined as 80 degrees), the cooling water pump does not work, the coolant does not flow through the car radiator, and only circulates inside the engine, relying on the temperature difference between the coolant and the engine for heat exchange.
When the temperature of the engine and circulating coolant reaches the default working state of the thermostat (above 80 degrees), the engine circulating water pump starts to work, and pumps the coolant inside the engine into the radiator to make it circulate inside the radiator once. The cooling air driven by the air cooler and the electronic fan installed to ensure the cooling air volume blows through the radiator to take away most of the heat and complete a heat exchange, Then the coolant is pumped into the engine by the water pump for heat exchange again.