Constant Temperature, Constant Pressure, Constant Flow Refrigerator

Constant Temperature, Constant Pressure, Constant Flow Chiller

Product Introduction

Direct Cooling (Refrigerant Direct Cooling): Utilizes the principle of latent heat of evaporation of refrigerants (such as R134a) to establish an air conditioning system in the vehicle or battery system. The evaporator of the air conditioning system is installed in the battery system, where the refrigerant evaporates and quickly and efficiently removes heat from the battery system, completing the cooling process.
Currently, the direct cooling method is primarily used in electric passenger vehicles, with the most typical example being the BMW i3 (which offers both liquid cooling and direct cooling solutions).

Detailed Introduction

New Energy Vehicle Cooling System (Water/Liquid Cooling Unit) Test Items:
1. Test the head and flow rate of the water pump to obtain the flow rate and head characteristic curve of the pump;
2. Test the flow rate of the water pump during actual vehicle use;
3. Test the heat dissipation characteristics of the radiator to obtain its cooling performance;
4. Output temperature characteristic curves at typical positions.
With the development of new energy power batteries, the government encourages the development of high-density, high-power, fast-charging, and fast-discharging new energy vehicles. The original air cooling method can no longer address the heat dissipation issues of batteries. The advantages of liquid cooling systems include fast cooling rates, good temperature uniformity, and simple and precise control of fluid (temperature and flow). Liquid cooling systems have become an inevitable trend for new energy vehicles, necessitating a redesign of the vehicle's thermal management system.
Currently, there is a lack of operational data on liquid cooling systems for battery packs (PACK), making it difficult for new energy vehicle manufacturers to design the vehicle's liquid cooling system. Manufacturers need to understand the following data:

1) The optimal temperature range for the battery pack is 10-30℃. In cold weather, the liquid cooling system may reach -30℃. The battery pack contains heating blocks for preheating before startup to provide thermal protection. When the battery temperature exceeds 30℃ during vehicle operation, the -30℃ liquid cooling system is required for cooling. At this point, what flow rate of liquid is needed to ensure the battery temperature remains within 10-30℃? Since the diameter of the vehicle's liquid cooling system pipes is fixed, pressure must be adjusted to control the flow rate. Similarly, as the temperature of the vehicle's coolant changes, the flow rate and pressure of the coolant must also change to ensure the battery temperature remains controlled.

2) In hot weather, the temperature of the vehicle's coolant and battery pack may exceed 50℃. What are the charging and discharging conditions of the battery pack? How should the cooling capacity of the vehicle's refrigeration system (including cabin air conditioning, battery pack, electric drive, and engine liquid cooling system) be matched to achieve rapid thermal balance in the vehicle's thermal management system? This ensures that vehicle performance and safety remain within reasonable limits. The above data require precise measurements from our company's liquid cooling thermal testing platform.