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Where we install the balance valve (DRV) in the Chiller connections (Supply Or Return) and Why ?

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Question added by Zaid Al Shurafa , Mechanical Project Engineer , Amana Contracting And Steel Buildings - DUBOX
Date Posted: 2016/10/30
Deleted user
by Deleted user

It is normally installed on return because of the following reasons

 

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1. ASHRAE Recommendations.

2. The coil of the unit should be flooded in case the valve is closed.

3. With a control valve on the return side, the water is at a higher pressure through the coil, reducing off gas, thereby lowering dissolved oxygen content. Lower dissolved oxygen extends equipment life by minimizing the air entrapment.

4. If it is a hot system, some manufacturers have temperature limitations on the actuators. If there is a180°F limit on the actuator (common to some actuators), the return side is preferred as it will operate at a cooler temperature.

Jabir Abdelrazag Sharif
by Jabir Abdelrazag Sharif , Senior Project Engineer , Zamil Airconditioing and Refrigeration Services

Traditionally, balance valves are used on all heating and cooling

coils when three-way coil control valves are used. The

advent of variable volume systems with two-way control

valves on these coils creates new considerations for the use of

balance valves.

Naveen Vallekadavil
by Naveen Vallekadavil , Mechanical Engineer , AECOM Middleeast

Well explained by Engr Naweed

Martin Thomas vaz
by Martin Thomas vaz , Senior Mechanical Engineer- Supervision consultant , ALKASHAF INTERNATIONAL-DESIGN AND ENGINEERING CONSULTANCY

Balancing valves are used for setting the scheduled distribution of water flow rate, and the uniform distribution of available pressure from the chilled water pumping system (source) to all the piping networks and all the AC equipment including chillers. The supply of chilled water to the equipment is to the cooling coils for the purpose is self-explanatory. So we need to consider the pressure drop in the cooling coil too when discussing about the chilled water system.

Hence the DRV or the balancing valve should be downstream of any individual equipment or a branch piping. The term double regulating valve (DRV) denotes to regulate water flow rate as well as pressure.

Sherif Mohammed Ibrahim
by Sherif Mohammed Ibrahim , Senior Mechanical Technical engineer , Al-Latifia Trading & Contracting Company

Answer of engineer Naweed Parkar is excellent, and enough for me

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