Archives for Geothermal Systems

mechanical installations

Geothermal Energy

Geothermal energy is heat derived within the sub-surface of the earth. Water and/or steam carry the geothermal energy to the Earth’s surface. Depending on its characteristics, geothermal energy can be used for heating and cooling purposes or be harnessed to generate clean electricity. A geothermal energy cooling / heating system is based on using the full potential of the constant temperature and thermal conductivity of the earths substructure.

We can see this phenomenon in basement areas where during the summer the area is cool and during the winter warm without the use of air conditioning.

Geothermal energy can be broken down into two categories: open loop systems and closed loop systems.

Open loop geothermal energy for cooling / heating is the pumping of under ground water source through a heat pump (or VRV) and the return of the water after the energy transfer. This method needs a constant water supply.

mechanical installations

Closed loop Geothermal energy systems can be divide into two categories.

Horizontal closed loop Geothermal energy system is installed at least 1.5 meters below the ground with pipe spacing of at least 1.8 – 2.2  Rm per m². Output is 20 – 35W/m². This system has the disadvantage of requiring a large area to be installed.

mechanical installations

Vertical closed loop Geothermal energy system where the loop is installed in a vertical bore well (6” – 8” diameter) and 60 – 120 deep. The minimum distance between the wells is 5 meters and the output is 40-70W/meter of depth, and depending on the soil structure. This system is more popular as you need less space and have a higher output.

mechanical installations

The heat which is collected from the earth is transferred to the  system (heat pump, chiller, VRV, etc.) and the exchange is made via heat exchangers and transferred to the cooling circuit of the unit as in a normal system. Due to the fact that the temperature is constant in the earth (±18.5°C) the energy required for this  this process is much less than in a normal system where the  air temperature is 40°C in summer and 5-10°C in winter.

Geothermal  energy can be used for under floor heating, fan coils, or for VRV systems, and the savings in comparison to a normal Air to water system can be up to 50-60% depending on the application and use of system.     

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renewable energy cyprus

The Guide to Home Geothermal Energy

Efficient and economical, geothermal heats, cools and cuts fossil fuel use at home. Whether you’re in sunny Florida, or snowy New Hampshire, a ground-fed climate system can free a consumer from fluctuating energy prices and save money on power bills immediately. Here’s how it works.

Drill and Fill: Installers thread pipe into a hole a few inches wide and over 100 feet deep. As wind and solar hog the alt-energy spotlight, this technology has remained underground.

“You’re not making heat, you’re moving heat,” Colorado geothermal installer Jim Lynch says. Installations like Lynch’s tap into the earth below the frost line–which always stays around 50 degrees Fahrenheit–to reduce a home’s heating and cooling loads. All HVAC systems require energy-intensive heat movement, a task responsible for over half of the average house’s total energy demand. Geothermal works more efficiently because the system’s mild starting point creates an efficient shortcut to the target temperature. Imagine a 100-degree Florida day or a 0-degree Michigan night: Spot the system 50 degrees, and it doesn’t work so hard to get the house comfortable.

Unlike wind and solar, geothermal’s power source never varies.

Bob Brown, vice president of engineering with equipment maker Water­Furnace, says, “The ground’s there all the time. It’s great for heating and it’s great for cooling. All I’ve got to do is bury a plastic pipe, put fluid in and, lo and behold, I’ve got a great system.”

HOW GEOTHERMAL HAPPENS

* In the ground: A water-filled, closed loop of 1-inch high-density polyethylene (HDPE) pipe ferries heat between the earth and the house. Pipes descend 4- to 6-inch-diameter vertical wells–the number and depth depend on the house’s site and size–before ganging together in a header and bringing lukewarm water in through the basement walls. Drillers backfill each hole with bentonite grout (or new enhanced grouts, engineered with fly ash) to maximize thermal conductivity.

* In the house: Pumps cycle water through the pipe loop to the heart of the system: the geothermal unit, which acts as furnace and air conditioner. This machine uses refrigerant and the temperate water from the underground pipes to heat or cool air. The air is then circulated through standard ductwork. With a device called a desuperheater, the unit uses excess heat to warm up domestic hot water at no added cost. The results feel the same as those from any standard forced-air HVAC system.

THE FLOW

Air in the ducts (1), refrigerant in the geothermal unit (2), and water in pipes (3) flow past each other like interlocking gears. Water brought from underground transfers heat to the refrigerant, or absorbs heat from it, depending on the season. Like an air conditioner, the unit compresses or expands the refrigerant to raise or lower its temperature. Finally, the refrigerant, now heated to 180 F or chilled to 40 F, fills condenser/evaporator coils. Air in the ducts blows across the coils to be cooled or warmed, then flows through the house.

THE SUPPLIES

* The bit: This mud-drilling bit grinds soft earth and funnels it back into hollow, 20-foot drill-shank sections. Corkscrew auger bits, in contrast, pound through solid rock. A new mud bit spinning at 1000 rpm, pushing downward with between 300 and 500 pounds of pressure, is good for five 150-foot holes.

* The pipe:
Water-filled HDPE pipes absorb heat through their walls. This sawed-off cross-section shows two pipes fused in a butt joint made by pressing the molten edges together at over 500 F. The joint, stronger than the walls of the pipe itself, resists rust, rot and leaks for a purported 200-year life span.

* The unit:
A combined furnace and air conditioner, the geothermal unit manages all-season climate control from the basement. Using the same principles as a refrigerator, which removes heat from food, this machine and the buried pipe remove heat from the earth or from the house. Wired to a 50-amp circuit, it works without venting, combustion or risk of carbon-monoxide poisoning.

THE SETUP

Vertical coils (1) fuel a system by using less total HDPE pipe than horizontal coils (2), in which loops of pipe fill shallow trenches exposed to constant heat just below the frost line. In pond systems (3), a blanket of water insulates coils anchored on racks. Hard ground can inhibit deep digging, stopping Colorado installers like Jim Lynch from doing simple vertical work: “Texas, Nebraska–that’s some easy drilling down there,” Lynch says. His clients receive options 2 and 3. If an existing system gets a geothermal upgrade, it may operate as geothermal 90 percent of the time, while the old boiler or furnace fires up only on the coldest days of the year. The payback period on retrofits averages 12 to 15 years; on new installations, it can get as low as three to six.

MONEY SAVED

A typical 2000-square-foot home in Commack, N.Y., was recently retrofitted with a geothermal system. Tax credits, the inefficiency of the existing system and a low-interest loan combined to create immediate savings. The monthly payment is now $24 lower than the old monthly HVAC expense.

Installation cost: $30,000 — $11,000 (tax credit) = $19,000

Annual costs: $3945 (old system) — $2076 (geo) = $1869 saved

Payback period: $19,000 / $1869 = 10.17 years

Monthly fuel costs for old system: $329

Monthly geothermal costs: $173 (power) + $132 (loan) = $305

GEOTHERMAL MISCONCEPTIONS

1. It’s a geyser. Hot springs and other steamy subterranean liquids are not related to residential geothermal. Those are unusual local seismic circumstances. Home systems work everywhere.

2. The water table is in the way.
Installers drill straight through it. On Long Island, where the water table is just a few feet below the surface, saturated sand makes for some of the best drilling and most efficient heat transfer possible.

3. It generates electricity.
Industrial-scale geothermal power plants can generate electricity. Home systems don’t–but they do save electricity (or fuel) by replacing conventional home heating and cooling with more efficient equipment.

Via Popular Mechanics

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Geothermal energy

A geothermal energy  cooling / heating system is based on using the full potential of the constant temperature and thermal conductivity of the earths substructure.

We can see this phenomenon in basement areas where during the summer the area is cool and during the winter warm without the use of air conditioning.

Geothermal energy can be broken down into two categories :Open loop systems and closed loop systems.

Open loop geothermal energy for cooling / heating is the pumping of under ground water source through a Heat pump (or VRV) and the return of the water after the energy transfer. This method needs a constant water supply.

geothermal systems cyprus

Closed loop Geothermal energy systems can be divide into two categories.

Horizontal closed loop Geothermal energy system is installed at least 1.5 meters below the ground with pipe spacing of at least 1.8 – 2.2  Rm per m². Output is 20 – 35W/m². This system has the disadvantage of requiring a large area to be installed.

geothermal systems cyprus

Vertical closed loop Geothermal energy system where the loop is installed in a vertical bore well (6” – 8” diameter) and 60 – 120 deep. The minimum distance between the wells is 5 meters and the output is 40-70W/meter of depth, and depending on the soil structure. This system is more popular as you need less space and have a higher output.

geothermal systems cyprusThe heat which is collected from the earth is transferred to the  system(Heat pump, CHILLER, VRV e.t.c.) and the exchange is made via heat exchangers and transferred to the cooling circuit of the unit as in a normal system. Due to the fact that the temperature is constant in the earth (±18.5°C) the energy required for this  this process is much less than in a normal system where the  air temperature is 40°C in summer and 5-10°C in winter.

Geothermal  energy can be used for under floor heating, fan coils, or for VRV systems, and the savings in comparison to a normal Air to water system can be up to 50-60% depending on the application and use of system.     

   

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mechanical installation

3rd TESSe2b – Project Progress Meeting 6 and 7 of October 2016

3rd TESSe2b Project Progress Meeting
6 and 7 of October 2016

The third TESSe2b project Progress meeting took place in Peterborough, U.K, on 6th and 7th of October 2016.
The meeting was hosted by PHASE CHANGE MATERIAL PRODUCTS LTD (PCM), one of the projects members.

Our company participated at the meeting where it was discussed the developments made in the project
and also the future work to develop related with the technical, management, quality, ethics and gender
issues will be debated.

TESSe2b –Thermal Energy Storage Systems for Energy efficient buildings.
An integrated solution for residential building energy storage by solar and geothermal resources.
Under Horizon 2020 – industrial.
The objectives of this project are how to storing High or Low temperature Energy for
later use in order to bridge the time gap between energy availability and energy use .
The storage of energy is achieved by using phase change materials (PCM) which is
a mixture of two or more chemicals having a freezing / melting temperature point
which is higher or lower than those of water.
The project objectives are divided into three parts:
a) Design: the scientists of all the universities involved in the team will exchange
ideas and information and prepare few designs of the system.
b) BMS (Controls):
Another team of the university scientists will design the controls and atomisation
of the system for the best operation and efficiency results.
c) Evaluation: All the designs of the scientific teams will be evaluated and come to
a decision to which design will be implemented.
d) Implementation: The implementation of the design will take place in three residential houses
as pilot project, in three different countries. One in Spain, one in Austria and one in Cyprus.
Our company Z and X Mechanical Installations Ltd will implement the pilot project in Cyprus.

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What are the benefits with Geothermal Energy Systems

A geothermal energy  cooling / heating system is based on using the full potential of the constant temperature and thermal conductivity of the earth’s substructure.

We can see this phenomenon in basement areas where during the summer the area is cool and during the winter warm without the use of air conditioning.

Geothermal energy can be broken down into two categories: Open loop systems and closed loop systems.

Open loop geothermal energy for cooling / heating is the pumping of underground water source through a Heat pump (or VRV) and the return of the water after the energy transfer. This method needs a constant water supply.

Closed loop Geothermal energy systems can be divide into two categories.

Horizontal closed loop Geothermal energy system is installed at least 1.5 meters below the ground with pipe spacing of at least 1.8 – 2.2 Rm per m². Output is 20 – 35W/m². This system has the disadvantage of requiring a large area to be installed.

Vertical closed loop Geothermal energy system where the loop is installed in a vertical bore well (6” – 8” diameter) and 60 – 120 deep. The minimum distance between the wells is 5 meters and the output is 40-70W/meter of depth, and depending on the soil structure. This system is more popular as you need less space and have a higher output.

The heat which is collected from the earth is transferred to the  system(Heat pump, CHILLER, VRV e.t.c.) and the exchange is made via heat exchangers and transferred to the cooling circuit of the unit as in a normal system. Due to the fact that the temperature is constant in the earth (±18.5°C) the energy required for this  this process is much less than in a normal system where the  air temperature is 40°C in summer and 5-10°C in winter.

Geothermal  energy can be used for under floor heating, fan coils, or for VRV systems, and the savings in comparison to a normal Air to water system can be up to 50-60% depending on the application and use of system.

Read more
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