NYBG PILOT PROJECT

HVAC EFFICIENCY

Discover HTF Compact at New York Botanical Garden – HVAC Efficiency Project. HTF Compact is a high-performing heat transfer additive that contains cupric oxide (CuO) nano sized particles, in stable suspension, that when added to a base fluid, increases the convective heat transfer of that fluid. It is formulated for use in closed-loop systems using water, ethylene glycol (EG) or propylene glycol (PG), and will not harm equipment, piping systems, gaskets or valve and pump seals. Tested under ASTM D-1384 and ASTM 2000-D 2BA. HTF Compact reduces heat exchanger approach temperature making existing heat exchangers perform more efficiently and favourably affecting new heat exchanger design selection. It also reduces chiller “lift” which increases chiller efficiency thereby lowering compressor energy.

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PROJECT IMPLEMENTATION

 

HTF Compact has been installed at New York Botanical Garden – Pfizer Building on June 2017. The scope of the project is to evaluate the effects of HTF Compact nanofluid when added to existing equipments to increase performance. Specifically, the systems intended for this study are a chiller system with 30% EG/water; an energy recovery system with 30% EG/water and a primary heating system with 100% water. In the energy recovery system, the rooftop exhaust air handling unit integrates airstreams from exhaust fans to 100% outdoor air systems via each unit’s respective heat recovery coil

The energy for the chiller system is electric and the energy for the heating system is natural gas. A third party measurement & verification (M&V) scope will capture system performance and energy use and will include energy data gathering as well as a degree-day analysis for the study period as compared to the baseline year.

SYSTEM STRUCTURE

PROJECT PROCEDURES

 

  • Analyze energy utilization data from the facility BMS and actual Utility energy bills.
  • Install the HTF additive first into the energy recovery system, second into the chiller system and third into the HW system.
  • Monitor system performance throughout the study period and make required adjustments to ensure optimal performance and equipment operation.
  • Compile and examine all data acquired and determine the efficacy of HTF in three separate systems.

 

HTF COMPACT BENEFITS

 

Several benefits have been registered. There is an increased convective heat transfer performance of heat exchangers, coils and the energy recovery unit. A reduced compressor energy (KWH) in the cooling system and a reduced boiler energy (Therms) in the heating system. Finally, a decrease in carbon footprint has been achieved through energy reduction.

Tests were performed to quantify the mechanical effects of the Nanofluid inside a heat exchanger by measuring the pressure drop using pressure sensors at inlet and outlet of the heat exchanger. Comparison in terms of pressure drop in the test case of Water and HTF COMPACT shows a minor difference using HTF COMPACT and EG, leading to a non-relevant additional energy loss of the pump. The viscosity of HTF Compact containing Ethylene Glycol and nanoparticles at temperatures between 20°C and 90 °C is comparable to water and Ethylene Glycol at the same concentration.

 

PRELIMINARY FINDINGS:

 

  • 25.0% reduction in chilled water load required to satisfy distribution set-point
  • 87.5% increase in Heat Exchanger Effectiveness based on HR approach
  • Temperature reduction from 8.5 to 1.1 degrees

BEFORE HTF COMPACT INSTALLATION

AFTER HTF COMPACT INSTALLATION


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