Transient Effectiveness Test of Cross Flow Air Heater Heat Exchanger

The problem of high electrical energy consumption in HVAC (heating, ventilation, and air conditioning system), makes renewable energy a solution to the problem. Renewable energy sources such as solar, geothermal, and wind energy are used in reducing electrical energy consumption, which is functioned to warm the room (space heating), drying agricultural products, melting snow-filled roads, heating agricultural land (soil heating), greenhouse heating, and hot springs. heat exchanger is a heat conducting device that can transfer energy from a fluid with a hot temperature to a cold temperature fluid or vice versa which can be used in the application of drying products produced by farmers, plantations, and large or small scale fisheries. Due to the function of the heat exchanger as a room heater, an effectiveness performance test was carried out on the air heater heat exchanger research carried out at the Thermofluid Lab, Department of Mechanical Engineering, Diponegoro University. In this test, several variations of water flow rate and air speed were carried out. There are variations of water flow discharge of 5 liters/minute, 2.5 liters/minute, and 0 liters. In the variation of air velocity there are speeds of 3.6 m/s, 2.7 m/s, and 1.8 m/s. The analysis obtained in the study is that the greatest effectiveness value occurs in the variation of water flow discharge of 2.5 liters/minute with an air speed of 1.8 m/s with a maximum effectiveness value of 0.622 and a minimum of 0.521.