What is the role of throttle valve in a refrigeration cycle?

What is the role of throttle valve in a refrigeration cycle?

As pointed out, the throttling process involves a sharp drop in pressure and expansion of the refrigerant. Its purpose is to convert saturated liquid from the condenser into liquid-vapor mixture at the input to the evaporator.

Does throttling reduce flow rate?

When the flow of a pump is regulated using a throttling valve, the system curve is changed. The operating point moves to the left on the Pump curve when the flow is decreased. Throttling valves are one way of controlling flow rates, by throttling flow directly or in a bypass line.

What is the throttling effect?

The throttling effect is to reduce the inlet pressure by a constant enthalpy process (represented by horizontal line AB). The result is a loss in entropy and also a slight fall in temperature with some reduction in the available heat drop. This accounts for a small loss in efficiency.

What type of valve is best for throttling?

butterfly valve
Among the most common valves, the butterfly valve is the most suitable for throttling. A full quarter turn can open or close the valve.

What types of valves are used for throttling?

The two main types of valves that we offer for throttling applications are our globe valves and our needle valves. In both these types of valves a stem is raised and lowered into the flow path and can be stopped at any point and left in that position.

Does throttling increase velocity?

The velocity downstream of a throttling valve is often higher than the upstream, simply because it’s at a lower density, but velocity has little to do with anything here.

Why is a throttle valve used in vapour compression refrigerator rather?

The refrigerant leaves the compressor at high pressure and temperature and enters the condenser. After leaving the condenser the refrigerant is at medium temperature and high pressure and then it enters the throttling valve. In the throttling valve the pressure and the temperature of the refrigerant is reduced drastically and suddenly.

What are the functions of a throttling device?

There are two important functions performed by the throttling devices or the expansion valves as mentioned below: 1) Reduce the pressure of the refrigerant: The refrigerant leaving the condenser is at high pressure. The pressure of the refrigerant has to be reduced so that it can vaporize at the required temperature in the evaporator.

How is a throttling valve used in an air conditioner?

Thus us it is the throttling valve where the temperature of the refrigerant is reduced and it is then able to produce the cooling effect in the evaporator of the refrigerator or the cooling coil of the air conditioner.

Why are the throttling devices called expansion valves?

The throttling devices allow restricted flow of the refrigerant. The throttling devices are also called as the expansion valves because when the refrigerant passes through them the pressure of the refrigerant drops down or it expands..