Archive for the ‘cooling’ Category

Geothermal Case Study: ALDI Grocery Store

Tuesday, August 31st, 2010
ALDI Farmington, NY

ALDI Farmington, NY

ALDI has a less-is-more approach to grocery retailing, and everything they do, from selecting suppliers to scouting locations to building and operating stores, facilitates savings substantial enough to impact the every-day living of its customers.

Geothermal heating and cooling is a natural fit for ALDI, and Eagle Mountain worked with ALDI to design and install a geothermal heating and cooling system for its location in Farmington, NY.

ALDI, Eagle Mountain, and APD Engineering & Architecture collaborated to design and implement a geothermal heating and cooling system with an anticipated payback period of 7.3 years.  The Farmington, NY location is ALDI’s first store with geothermal, and this project will be used as a case study for future implementation of geothermal heating and cooling technology.

Geothermal System — Ground Loop

The Farmington, NY site utilizes 3 horizontal slinky geothermal loopfields. The loopfields are 132 feet long and vary in width based on the number of loops.  Two 8-loop fields are located under the parking lot and a smaller 2-loop field is located behind the store in a grassed area.  Redundant circulators can be seen in the following photo:

Loopfield Pump Panel

Loopfield Pump Panel

Geothermal System – Heat Pumps

The geothermal system operates with two 12 ton and one 4 ton horizontal water-to-air Geomax geothermal heat pumps suspended from the ceiling.  A custom designed hydronic pump panel connects the two 12 ton units to the loopfield, and a standard pump pack supplies the smaller 4 ton heat pump.  Hot and cool air is distributed through ducting.

GEOMAX Geothermal Heat Pump

GEOMAX Geothermal Heat Pump

Ducting at Aldi Grocery

Ducting at Aldi Grocery

Geothermal System – Heat Recovery Ventilation (HRV)

The ALDI store uses 2 Fantech Heat Recovery Ventilators (HRV) to increase operational efficiency of the geothermal HVAC system.  HRV units exchange heat between intake and exhaust air, avoiding wasted energy from exhausting conditioned air.

Fantech HRV

Fantech HRV

About ALDI

ALDI entered the U.S. market in 1976, with a handful of stores in southeastern Iowa. Now, over 1,000 U.S. ALDI stores are spreading the savings from Kansas to the East Coast. In its 2008 report, Supermarket News ranked ALDI 25th in U.S. grocery chains in terms of gross sales—a considerable accomplishment given their select assortment and low prices.

Project Overview:

Customer: ALDI

Location: Farmington, NY

Project: Geothermal HVAC system with water-to-air heat pumps.


Installer: Geocorp

Geothermal Case Study: Red Tail Ridge

Tuesday, June 15th, 2010
Red Tail Ridge

Red Tail Ridge

Customer: Geocorp

Location: Penn Yan, NY

Project: Red Tail Ridge Winery: HVAC and Wine Process Cooling with: Geothermal, Radiant, HRV, Energy Management


Red Tail Ridge is a Finger Lakes winery using an Eagle Mountain geothermal system for HVAC and process cooling.

An industry leader in sustainability and innovation, the new facility at Red Tail Ridge will be LEED certified and delivers a 40.1% total energy savings.  The system components include geothermal, radiant heating, heat recovery ventilation, and Ecô energy management.

System Background

The system design calls for a 20-ton closed-loop geothermal heat pump system to heat and cool the building, and to provide chilled water for process cooling. The system consists of four (4) 5-ton Cascade water-to-water heat pumps, a horizontal closed-loop “GeoSlinky” ground loop heat exchanger, and a custom Hydronic Control Panel.

Geothermal Heat Pumps

Two geothermal heat pumps are dedicated to space heating and cooling. Radiant floor heating is installed in the process, case and barrel storage, and bottling areas. A fan coil unit provides for cooling and heating loads in the laboratory located on the mezzanine level.

The other two water-to-water heat pumps generate chilled propylene glycol to meet the process cooling requirements of winemaking.

Horizontal Slinky Loop

The horizontal slinky loop consists of eight trenches, each 130 feet long with 4 feet spacing between each trench. The slinky coil is 34- inches in diameter with 18-inches of pitch. A propylene glycol solution is circulated through the ground loop heat exchanger and the water-source heat pumps by a variable flow/variable speed loop pumping system.

Heat Recovery Ventilation

Ventilation air will be introduced into the building through a heat recovery ventilator (HRV). The HRV includes a flat plate heat exchanger that transfers energy between building exhaust and outdoor air streams.

Control System

The entire HVAC system including wine process cooling is controlled by Eagle Mountain’s Ecô energy management system.  This “virtual control device” replaces all hardware control devices and is accessible from any Internet connection in the world.

The Ecô energy management system has additional benefits for Winemakers.  This browser-based system allows the Winemaker to control and monitor the winemaking process remotely. Ecô provides Winemakers an innovative alternative to manual operation of the Winemaking process.

Click to learn more about The Ecô energy management system.

Design & Installation

Eagle Mountain specified the system design, integrated and supplied all components, and provided consulting services for the application of geothermal technologies for LEED certification.

Geocorp, an alternative energy installer located in Western New York, installed the system at Red Tail Ridge.

Process to change Geothermal from Heating to Cooling

Monday, June 7th, 2010
Jason Murphy

Jason Murphy

Geothermal systems provide both heating and cooling.

If you have a forced-air geothermal system using a water-to-air geothermal heat pump, simply change your thermostats from heating to cooling mode, and you are done. Forced-air geothermal systems are the easiest to change from heating to cooling mode.

Cooling with Hydronic Geothermal Heat Pumps

If you have a radiant heating system, your hydronic geothermal heat pump provides cooling via high-velocity or low-velocity air handlers.

Step 1: Locate your Hydronic Control Panel

If you have a hydronic system, the first step is to locate your hyrdonic control panel in the mechanical room.  You control panel will look like this:

Hydronic Control Panel

Hydronic Control Panel

Step 2: Determine if you have 1 or 2 Tekmar Controls

The device that tells your heat pump to make either hot or cold water is a Tekmar 152 two stage setpoint control.  Your control panel will either have one or two Tekmar controls.