How do you start a heat exchanger?

After completing the prestart checks, the heat exchanger can be started.

1. Establish the cooling water supply (shell-side in this example). Open the shell – side vent. Partially open the shell-side water inlet valve to slowly fill the shell side.
2. Establish the flow of process fluid. Open the tube – side vent valve.

How are heat exchangers controlled?

Control Objective Heating is achieved by passing steam in the tube side, the more steam passing through the tubes the more heat is transferred to the process fluid, and vice versa. Control of the steam flow F2 (manipulated variable) is achieved by throttling a modulating valve installed on the steam inlet side.

What is HVAC heat exchanger?

What Is a Heat Exchanger in HVAC? A heat exchanger is a device that transfers thermal energy from one medium to another. Heat exchangers not only assist in the cooling and heating of homes and buildings, but also help machines and engines work more efficiently.

Why are heat exchangers needed?

Heat exchangers are used to transfer heat from one medium to another. These media may be a gas, liquid, or a combination of both. Heat exchangers can improve a system’s energy efficiency by transferring heat from systems where it is not needed to other systems where it can be usefully used.

What are the required strategies for controlling heat transfer?

Conduction is the pathways the heat travels though.

• Keep external surfaces cooler in summer, e.g. by shading or using light colours.
• Insulation reduces thermal conduction through roof, ceiling and external walls.
• Warmth through the ceiling is controlled by ceiling insulation and roof cavity temperature.

Which one is control variable in heat exchanger?

The shell side fluid is the process fluid that is required to be heated to a certain temperature setpoint. The resulting temperature is measured at the outlet of the heat exchanger T1Out (controlled variable). Heating is achieved by passing steam through the tube side.

What do you mean by heat exchanger?

A device for transferring thermal energy (heat) from one fluid (liquid or gas) to another, when the two fluids are physically separated; such as a radiator.

How does furnace heat exchanger work?

A furnace heat exchanger works by literally exchanging (or transferring) the heat created in the combustion chamber to the exterior of the unit, where it is then blown through the ductwork throughout the house. The hot combustion gases enter into the chamber of the heat exchanger, where they heat up the metal walls.

What is heat exchanger example?

Heat exchangers are used in both cooling and heating processes. The classic example of a heat exchanger is found in an internal combustion engine in which a circulating fluid known as engine coolant flows through radiator coils and air flows past the coils, which cools the coolant and heats the incoming air.