||Water cooled chiller units + boiler system
||Nobao GSHP system
|Mode of Exchange
||Exchange heat/cold with water, open circulation through cooling tower plus boiler system (coal; oil or gas) for heating supply.
||Exchange with ground source energy, eliminating releasing excess heat/cold into surrounding air with no city heat island effects
||Exchange with release excess heat/cold to surrounding air, easy to cause city heat island effects
||High energy consumption, high CO2 emission, noise pollution
||Zero CO2 emission, no heat island effects, low energy consumption, neat & clean system
||Air cooling, low efficiency
||Water cooling，open cycle，high water consumption, boiler at very low efficiency for heating.
||Closed cycling water cooling exchange with ground source energy, stable, very high efficiency, heat recovery.
||High Attenuation, meaning the more extreme outside air temperature, the lower efficiency.
||Medium attenuation because of the dependence of the cooling water on the surrounding atmosphere
||Underground temperature sustainable and stable, consistent high efficiency with zero attenuation regardless of atmosphere conditions
||Main machine placed outdoor or on roof, noise/vibration pollution, negative impact on architecture outview
||Need large in-house mechanical space and special boiler room, outdoor (roof) cooling tower produce noise/vibration pollution and negative impact building outview
||Small space required(1/3), flexible multi-module installation, very low noise, no outdoor equipment, no impact on outview
||10 - 12 years
||Water cooled units 15 years,Boiler 10 years
||Single system >25 years
||air cooled exchanger easy to be polluted, requires regular professional cleaning
||cooling tower efficiency decrease over the timeline also significantly
||Outdoor underground closed pipeline system energy exchange, no maintenance needs, no attenuation, lifetime more than 50 years
||System unstable, difficult repair once mal functioning.
||Needs professional personnel to daily operate and maintain.
||stable system, no requirement for daily
||High initial investment, high operation and energy costs
||Medium initial investment, high operation and energy
||High initial investment, very low operation and maintenance cost
||Difficult maintenance and safety issue
||main machine malfunction influence whole system, boiler burning has high risk and need annual government check on safety and fire risk
||Zero CO2 omission, If one module malfunction, no influence on overall system, zero pollution or safety issue