commercial boilers. high mass advantages flow indifferent primary piping resistant to low return...
Post on 20-Jan-2016
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High Mass
Medium Mass
Low Mass
COMMERCIAL BOILERS
HIGH MASS Advantages• Flow Indifferent• Primary Piping• Resistant to low return temperature issues• Up to 1200 H.P.• 20 plus year life expectancy
Disadvantages • Least efficient • Higher cost per BTU output• Big Footprint• Thermal shock
LOW MASS CFT
Advantages• Lowest cost per BTU output• Small footprint
Disadvantages
• Flow dependent• Short cycles• Vulnerable to condensate• Required primary secondary piping• Up to 15 years of life
LOW MASS FIRE TUBE
Advantages• Small Footprint• Higher Efficiencies
Disadvantages • Flow dependent• Requires high turndown ratio• Primary secondary piping• 316L• Up to 10 year life
MEDIUM MASS FIRETUBEAdvantages
• Flow independent• Primary Piping• Tolerant to low return temps• 20 plus year life• Small footprint• Resists thermal shock• Available in condensing & Non-Condensing• No short cycling• 5:1 turndown adequate
Disadvantages• More expensive than low mass
SUPPLY/RETURN SYSTEM• 2 Way vs. 3 way valves• Bypass
Minimum Flow Rate• High Mass• Low Mass• Medium Mass
Type of Pipe
• Steel• Copper• PP-R
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