3
efficiency are directly related to the ability of the chiller to transfer heat and this starts with
having a clean condenser tubes and clean evaporator. The efficiency of the chiller water cooling
plant deteriorates as tubes become contaminated or fouled especially when contaminants, scale,
sludge, algae, or mud accumulate on the waterside surface of the heat-transfer surfaces (Zheng,
Watt, & Wang, 2016). The rate of system contamination depends on the type of the system
which can either be closed or open and also the water temperature, cleanliness, and quality. If the
tubes of the chiller become plugged or coated with biological growth, sludge, or scale, the ability
to transfer heat significantly drop.
All chiller makeup and circulating water contains contaminants. Chemical treatment of water
assist in preventing the accumulation of contaminants on the surfaces of heat transfer. The wrong
concentration or chemicals that are too high can damage the internal components. It is still
important to perform a cleaning of condenser tubes of the chiller water cooling plant using brush
even with suitable water treatment program (Thangavelu, Myat, & Khambadkone, 2017).
The annual cleaning can eliminate accumulation of loose materials, biological growth, and
sludge.
Presence of Non-condensable Gas
The presence of non-condensable gas in the condenser tubes of the chiller water cooling plant
introduces additional thermal resistance at the condenser which can substantially lower the
energy efficiency of the plant. The addition of thermal resistance caused by presence of non-
condensable gas in the condenser tube arises, deriving from a diffusion process of vapor in the
non-condensable gas layer that tends to concentrate near the condensing surface, being conveyed
by the centripetal force of vapor towards the tubes (Xiupeng, Guanglin, & Kusiak, 2014). It
is clear that a small quantity of non-condensable gas causes huge damage since they are not

+13062052269

info@desklib.com

Operation and Maintenance of Building Services Docx.

Contribute Materials

Related Documents

Plant