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Massachusetts-based developers Orchard Knoll, LLC are tracking the performance of new eco-friendly home heating and cooling systems installed in Wayside Farm homes, a 66-unit development in East Bridgewater, MA.

Developer and engineer Mike McGonigle explained that each colonial-style home features a geothermal heat exchange system, supplied by Coneco Geothermal Systems, that takes advantage of temperatures deep in the Earth to help keep the home warm in the winter and cool in the summer. Water is pumped through a loop down a 300- to 400-foot well and back up to a heat exchanger in the basement.

Since the average temperature of the ground at that depth is stable year-round, once the water in the loop reaches the basement, heat is either transferred to the home’s air in winter, or removed from it during warmer months.

Many factors can affect system performance, ranging from water flow and pressure to outdoor temperature and the motor runtime of the heat exchanger.

“To ensure optimal performance, we recognized early on that we needed a system for capturing data, and I researched the different systems available,” said McGonigle.

The developers ultimately chose an Onset HOBO U30/GSM Remote Monitoring System. The system

Geothermal HVAC Systems Monitoring

“To ensure optimal

performance, we

recognized early on that

we needed a system for

capturing data, and I

researched the different

systems available.”

− Mike McGonigle

Quick Facts

Project Description: Monitoring geothermal HVAC systems performance

Customer: Orchard Knoll, LLC

Monitoring Location: Bridgewater, MA

System Components:   • HOBO® U30/GSM system

  • HOBOlink® data plan

  • Range of Smart Sensors (See diagram on reverse side)

Geothermal

onsetcomp.com 1-800-LOGGERS

onset®

1-800-LOGGERS onsetcomp.com

onset Computer Corporation HOBO®

U30 Remote Monitoring System

HOBO® U30Remote Monitoring System

Monitoring:��

Temp/RHPower Usage

geothermal unitwell pumpenitre house

Pulse Output kWh Transducer

Ø1

Ø2

Ø3

LINE

Current Transformers

Output

Ø 2 CTØ 3 CT

Ø 1 VACØ 2 VAC

Ø 3 VAC

T-WNB-3Y-208

S-UCC-M006

Parts List QTY Part # PriceHOBO U30....................................................................... 1 .............. U30-GSM-VIA-10-S100-102 ...$927HOBOlink/TMobile Service ....................................... 1 .............. SP-102 ............................................$699AC Battery Charger for U30....................................... 1 .............. AC-U30...........................................$35Temperature/RH Sensor............................................. 2 .............. S-THB-M008 .................................$185Pulse Input Adapter..................................................... 3 .............. S-UCC-M006.................................$6920 Amp CTs .................................................................... 4 .............. T-MAG-SCT-20 .............................$50100 Amp CTs ................................................................. 2 .............. T-MAG-SCT-100...........................$100kWh Transducer Pulse Output ................................ 3 .............. T-WNB-3Y-208 .............................$270Solar Radiation Shield................................................. 1 .............. RS3 ..................................................$59HOBOware Software ................................................... 1 .............. BHW-PC or BHW-MAC ..............$99

Note: For this setup the GSM cellular plan uas used with 2 analog inputs and 10 sensor inputs.

(2 20 Amps for geothermal and well2 100 Amps for entire house)

Indoor Temp/RHS-THB-M008

Outdoor Temp/RHS-THB-M008

This setup was used for monitoring the geothermal unit, the well pump, and theentire house

System Diagram

consists of a GSM cellular-based data logging unit mounted on the wall in the model home’s basement, and sensors that plug into the unit. The sensors monitor indoor and outdoor temperature and relative humidity, as well as power usage of the geothermal unit, well pump, and the whole home. The HOBO U30 collects data all day, every day, and the information is accessible via the web at Onset’s HOBOlink™ website.

“You can upload data and have it formatted and presented to a website anywhere,” said McGonigle. “I can wake up at four in the morning and know exactly what

the heating unit’s doing. It’s very valuable information for engineers to be able to look at the behavior of a system as it’s operating.”

McGonigle has been able to learn valuable information about the duty cycles of the heat pump, and has been able to adjust the system. The monitoring system will continue to be valuable in the future as the developers plan to add solar thermal units to the homes’ roofs to further help with home heating and the hot water supply. About Onset Onset is the world’s leading supplier of data loggers. The company’s HOBO data logger and weather station products are used around the world in a broad range of monitoring applications, from verifying the performance of green buildings and renewable energy systems to agricultural and coastal research. Based on Cape Cod, Massachusetts, Onset has sold more than one million data loggers since the company’s founding in 1981. Visit Onset on the web at http://www.onsetcomp.com.

Onset Computer Corporationhttp://www.onsetcomp.com(800) 564-4377 / (508) 759-9500Fax: (508) 759-9100sales@onsetcomp.com

Live system data from Onset’s HOBOlink web site.

Geothermal

Note: For this setup, the GSM cellular plan was used with 2 analog inputs and 10 sensor inputs.

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