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ipe wall to the air due to increased distances some consider that it is more efficient to pull air through a long tube than to push it with a fan a solar chimney can use natural convection warm air rising to create a vacuum to draw filtered passive cooling tube air through the largest diameter cooling tubes natural convection may be slower than using a solar powered fan sharp 90 degree angles should be avoided in the construction of the tube two 45 degree bends produce less turbulent more efficient air flow while smooth wall tubes are more efficient in moving the air they are less efficient in transferring energy there are three configurations a closed loop design an open fresh air system or a combination closed loop system air from inside the home or structure is blown through a u shaped loop of typically 30 to 150 m 98 to 492 ft of tube s where it is moderated to near earth temperature before returning to be distributed via ductwork throughout the home or structure the closed loop system can be more effective cooling the air during air temperature extremes than an open system since it cools and recools the same air open system outside air is drawn from a filtered air intake minimum efficiency reporting value merv 8 air filter is recommended to cool or preheat the air the tubes are typically 30 m 98 ft long straight tubes into the home an open system combined with energy recovery ventilation can be nearly as efficient 80 95 as a closed loop and ensures that entering fresh air is filtered and tempered combination system this can be constructed with dampers that allow either closed or open operation depending on fresh air ventilation requirements such a design even in closed loop mode could draw a quantity of fresh air when an air pressure drop is created by a solar chimney clothes dryer fireplace kitchen or bathroom exhaust vents it is better to draw in filtered passive cooling tube air than unconditioned outside air single pass earth air heat exchangers offer the potential for indoor air quality improvement over conventional systems by providing an increased supply of outdoor air in some configurations of single pass systems a continuous supply of outdoor air is provided this type of system would usually include one or more ventilation heat recovery units shared ground arrays edit potential benefits associated with shared ground heat exchange a shared ground array comprises connected ground heat exchangers for use by more than one home 1 they can deliver low carbon heating where individual ground coupled heat exchangers are not viable such as in terraced housing with little outside space they can also provide opportunities to decarbonise heating for groups of homes away from dense urban centres where traditional district heating is unlikely to be economically viable 1 other benefits include higher efficiency and lower capital cost greater resident control to choose their own electricity supplier and reduction in the number of exchangers required due to the variance in peak load times between different households 1 thermal labyrinths edit a thermal labyrinth performs the same function as an earth tube but they are usually formed from a larger volume rectilinear space sometimes incorporated into building basements or under ground floors and which are in turn divided by numerous internal walls to form a labyrinthine air path maximising the length of the air path ensures a better heat transfer effect the construction of the labyrinth walls floors and dividing walls is normally of high thermal mass cast concrete and concrete block with the exterior walls and floors in direct contact with the surrounding earth 2 safety edit if humidity and associated mold colonization is not addressed in system design occupants may face health risks at some sites the humidity in the earth tubes may be controlled simply by passive drainage if the water table is sufficiently deep and the soil has relatively high permeability in situations where passive drainage is not feasible or needs to be augmented for further moisture reduction active dehumidifier or passive desiccant systems may treat the air stream formal research indicates that earth air heat exchangers reduce building ventilation air pollution rabindra 2004 states the tunnel earth air heat exchanger is found not to support the growth of bacteria and fungi rather it is found to reduce the quantity of bacteria and fungi thus making the air safer for humans to inhale it is therefore clear that the use of eat earth air tunnel not only helps save the energy but also helps reduce the air pollution by reducing bacteria and fungi 3 likewise flueckiger 1999 in a study of twelve earth air heat exchangers varying in design pipe material size and age stated this study was performed because of concerns of potential microbial growth in the buried pipes of ground coupled air systems the results however demonstrate that no harmful growth occurs and that the airborne concentrations of viable spores and bacteria with few exceptions even decreases after passage through the pipe system and further stated based on these investigations the operation of ground coupled earth to air heat exchangers is acceptable as long as regular controls are undertaken and if appropriate cleaning facilities are available 4 whether using earth tubes with or without antimicrobial material it is extremely important that the underground cooling tubes have an excellent condensation drain and be installed at a 2 3 degree grade to ensure the constant removal of condensed water from the tubes when implementing in a house without a basement on a flat lot an external condensation tower can be installed at a depth lower than where the tube enters into the house and at a point close to the wall entry the condensation tower installation requires the added use of a condensate pump in which to remove the water from the tower for installations in houses with basements the pipes are graded so that the condensation drain located within the house is at the lowest point in either installation the tube must continually slope towards either the condensation tower or the condensation drain the inner surface of the tube including all joints must be smooth to aid in the flow and removal of condensate corrugated or ribbed tubes and rough interior joints must not be used joints connecting the tubes together must be tight enough to prevent water or gas infiltration in certain geographic areas it is important that the joints prevent radon gas infiltration porous materials like uncoated concrete tubes cannot be used ideally earth tubes with antimicrobial inner layers should be used in installations to inhibit the potential growth of molds and bacteria within the tubes effectiveness edit implementations of earth air heat exchangers for either partial or full cooling and or heating of facility ventilation air have had mixed success the literature is unfortunately well populated with over generalizations about the applicability of these systems both in favor of and against a key aspect of earth air heat exchangers is the passive nature of operation and consideration of the wide variability of conditions in natural systems earth air heat exchangers can be very cost effective in both up front capital costs as well as long term operation and maintenance costs however this varies widely depending on the location s latitude altitude ambient earth temperature climatic temperature and relative humidity extremes solar radiation water table soil type thermal conductivity soil moisture content and the efficiency of the building s exterior envelope design insulation generally dry and low density soil with little or no ground shade will yield the least benefit while dense damp soil with considerable shade should perform well a slow drip watering system may improve thermal performance damp soil in contact with the cooling tube conducts heat more efficiently than dry soil earth cooling tubes are much less effective in hot humid climates like florida where the ambient temperature of the earth approaches human comfort temperature the higher the ambient temperature of the earth the less effective it is for cooling and dehumidification however the earth can be used to partially cool and dehumidify the replacement fresh air intake for passive solar thermal buffer zone 5 areas like the laundry room or a solarium greenhouse especially those with a hot tub swim spa or indoor swimming pool where warm humid air is exhausted in the summer and a supply of cooler drier replacement air is desired not all regions and sites are suitable for earth air heat exchangers conditions which may hinder or preclude proper implementation include shallow bedrock high water table and insufficient space among others in some areas only cooling or heating may be afforded by earth air heat exchangers in these areas provision for thermal recharge of the ground must especially be considered in dual function systems both heating and cooling the warm season provides ground thermal recharge for the cool season and the cool season provides ground thermal recharge for the warm season though overtaxing the thermal reservoir must be considered even with dual function systems environmental impact edit in the context of today s diminishing fossil fuel reserves increasing electrical costs air pollution and global warming properly designed earth cooling tubes offer a sustainable alternative to reduce or eliminate the need for conventional compressor based air conditioning systems in non tropical climates they can also help to balance the electricity grid to support fluctuating supply from other renewable energy sources 1 they also provide the added benefit of controlled filtered temperate fresh air intake which is especially valuable in tight well weatherized efficient building envelopes water to earth edit an alternative to the earth to air heat exchanger is the water to earth heat exchanger this is typically similar to a geothermal heat pump tubing embedded horizontally in the soil or could be a vertical sonde to a similar depth of the earth air heat exchanger it uses approximately double the length of pipe of 35 mm diameter e g around 80 m compared to an eahx of 40 m a heat exchanger coil is placed before the air inlet of the heat recovery ventilator typically a brine liquid heavily salted water is used as the heat exchanger fluid many european installations are now using this setup due to the ease of installation no fall or drainage point is required and it is safe because of the reduced risk from mold see also edit renewable energy portal ab anbar aquifer thermal energy storage cistern earth sheltering geothermal heat pump geothermal power hvac passive cooling qanat renewable energy seasonal thermal energy storage solar air conditioning solar chimney stepwell windcatcher yakhchāl references edit 1 2 3 4 bale c barns d turner j 2022 04 06 shared ground heat exchange for the decarbonisation of heat eprints whiterose ac uk doi 10 48785 100 91 retrieved 2022 04 07 integrating active thermal mass strategies in responsive buildings pdf archived from the original pdf on 3 july 2011 retrieved 21 december 2012 bhattarai rabindra nath mishra shailendra kumar basnyat pawan use of earth air tunnel hvac system in minimizing indoor air pollution cite journal cite journal requires journal help measurement modeling and simulation of an earth to air heat exchanger in marburg germany archived 2012 04 26 at the wayback machine rainer wagner stefan beisel astrid spieler klaus vajen philipps universität marburg department of physics 2000 two small delta ts are better than one large delta t u s doe ornl zero energy design workshop retrieved 2007 12 23 international energy agency air infiltration and ventilation center ventilation information paper no 11 2006 use of earth to air heat exchangers for cooling external links edit energy savers earth cooling tubes us dept of energy archived 2010 01 05 at the wayback machine v t e heating ventilation and air conditioning fundamental concepts air changes per hour ach bake out building envelope convection dilution domestic energy consumption enthalpy fluid dynamics gas compressor heat pump and refrigeration cycle heat transfer humidity infiltration latent heat noise control outgassing particulates psychrometrics sensible heat stack effect thermal comfort thermal destratification thermal mass thermodynamics vapour pressure of water technology absorption compression heat pump absorption refrigerator air barrier air conditioning antifreeze automobile air conditioning autonomous building building insulation materials central heating central solar heating chilled beam chilled water constant air volume cav coolant cross ventilation dedicated outdoor air system doas deep water source cooling demand controlled ventilation dcv displacement ventilation district cooling district heating electric heating energy recovery ventilation erv firestop forced air forced air gas free cooling heat recovery ventilation hrv hybrid heat hydronics ice storage air conditioning kitchen ventilation mixed mode ventilation microgeneration passive cooling passive daytime radiative cooling passive house passive ventilation radiant heating and cooling radiant cooling radiant heating radon mitigation raised floor refrigeration renewable heat room air distribution solar air heat solar combisystem solar cooling solar heating thermal insulation thermosiphon underfloor air distribution underfloor heating vapor barrier vapor compression refrigeration vcrs variable air volume vav variable refrigerant flow vrf ventilation water heat recycling components air conditioner inverter air door air filter air handler air ionizer air mixing plenum air purifier air source heat pump attic fan automatic balancing valve back boiler barrier pipe blast damper boiler centrifugal fan ceramic heater chiller condensate pump condenser condensing boiler convection heater compressor cooling tower damper dehumidifier duct economizer electrostatic precipitator evaporative cooler evaporator exhaust hood expansion tank fan fan coil unit fan filter unit fan heater fire damper fireplace fireplace insert freeze stat flue freon fume hood furnace gas compressor gas heater gasoline heater grease duct grille ground coupled heat exchanger ground source heat pump heat exchanger heat pipe heat pump heating film heating system hepa high efficiency glandless circulating pump high pressure cut off switch humidifier infrared heater inverter compressor kerosene heater louver mechanical room oil heater packaged terminal air conditioner plenum space pressurisation ductwork process duct work radiator radiator reflector recuperator refrigerant register reversing valve run around coil sail switch scroll compressor solar chimney solar assisted heat pump space heater smoke canopy smoke damper smoke exhaust ductwork thermal expansion valve thermal wheel thermostatic radia...