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Variable Flow Heat Transfer Systems (HTS-VF)

The Model HTS-VF, Variable Flow Heat Transfer System is a UL-Listed, factory assembled and tested system used in building hydronic heating systems. The HTS-VF provides significant power savings by automatically controlling the speed of system pump(s) based on the actual building system demand. Typically, Differential Pressure Transmitters are placed across the building heating system zone loops. The transmitters signal to the HTS-VF System Controller which controls a Variable Frequency Drive for each pump to the appropriate speed. Additionally, the HTS-VF can be controlled by system load (BTU/hr) which utilize a flowmeter and RTD's; system pressure; or system temperature by customizing the controller to individual building requirements. The HTS-VF can be configured in any of the EnviroSep Heat Transfer System offerings:

A. HTS Standard Heat Transfer System
B. HTS-ITC Heat Transfer System w/ Integrated Temperature Control
C. HTS-NP Negative Pressure Heat Transfer System
D. HTS-HWB Heat Transfer System w/ Hot Water Boiler

Consequently, when configured with the HTS-NP, the Variable Flow Heat Transfer System maximizes energy and power savings. Hot water is supplied at a standard 180oF and is recirculated through the building system by use of VFD-controlled centrifugal pumps which are sized to meet specific building requirements. The Model HTS-VF includes a UL-listed System Controller with single-point power connection which is prewired to all electrical sources. Variable Frequency Drives may incorporate Manual or Automatic bypasses. Each system is custom-engineered and designed to meet specific requirements. All systems are UL-listed, fabricated and welded per ASME Section IX, and are Hydrostatically tested prior to shipment. The best feature of the HTS-VF is the ability to provide a cost reduction to building owners. Additionally, this fully integrated, ready-to-install system speeds installation and start-up of building hydronic heating systems which provide significant savings to contractors, engineers, and building owners.

• View HTS-VF specifications
• View detailed information on Model HTS-VF, Variable Flow Heat Transfer System (PDF)

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Legend A. Base-mounted, End-suction Centrifugal Pumps B. Shell and Tube, U-tube Heat Exchanger with Steam Trap (if applicable) C. Isolation and Check Valves D. Air Separator with Auto Air Vent E. Expansion / Compression Tank F. System Inlet / Outlet Thermometers G. Pump Differential Pressure Gauge H. UL-listed Electrical Control Panel I. Make-up Water Assembly J. Condensate Recovery System (if applicable) K. Variable Frequency Drives & Controller

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Standard Construction Structural Channel Base Carbon Steel Piping Operational Testing Pump Isolation Valves Hydrostatically Tested High Temperature Industrial Enamel Paint

Conditions of Operation Max. Allowable Pressure: 125 psig Max. Allowable Temp.: 240 oF

Pump Speed (%) Input Power (%) Potential Savings ($/yr.) 100 100 $ 0 90 73 $ 4,329 80 51 $7,856 70 34 $10,581 60 22 $12,505 50 13 $13,948 40 6 $15,070 30 3 $15,551

Notes: 1. Savings are based on max. potential savings at max. pump capacity on 8600 hr./yr. of continuous operation. 2. Power costs at $0.10/kW-hr. 3. Savings assume continuous operation of one (1) 25 Hp Pump. 4. Savings based on approx. calculations.

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Cost Justification on HTS-VF

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For more information on how EnviroSep can provide your company with an Integrated Solution for your Fluids Handling, Heat Transfer, and/or Energy Recovery needs, use our quick & easy Online Quote Request Form, call our main office at 843-546-7400 (you can fax us at 843.546.7407) or

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