A Review of Underground Soil and Night Sky as Passive Heat Sink: Design Configurations and Models
Abstract
:1. Introduction
2. Earth-Air-Heat-Exchangers (EAHE)
2.1. Principle
2.2. Applications
2.3. Configurations
2.3.1. Single and Multiple Pipe Heat Exchanger
2.3.2. No Dig Heat Exchanger
2.3.3. Ground Coupled Heat Pump (GCHP)
2.4. Influence of Different Parameters
- Depth: As the time lag between the underground and ambient temperatures increases with depth at which the pipes are buried, the thermal performance of the EAHE system also improves by increasing depth. However, it was observed that the improvement in performance was negligible beyond the depths of 4 m [2,3,12,15,16,36,84].
- Length: Different lengths of buried pipes have been used in experimental projects and theoretical analyses [1,2,15,16,36,85,86,87,88]. Longer pipes typically resulted in better performance due to higher heat transfer with the soil. The heat transfer rate becomes very small as the temperature of fluid inside the pipes becomes close to the underground soil temperature. Any further pipe length then does not reduce the air temperature.
- Pipe radius: A number of researchers have performed parametric analysis to study the impact of pipe radius. Pipe radius has a direct impact on the convective heat transfer coefficient. Pipes with smaller radius experience higher heat transfer coefficients, which results in lower thermal resistance between the soil and air [2,15,16,86,89,90]. This would imply that using a smaller radius for the pipe should result in lower outlet temperature when the EAHE is operating in cooling mode, and higher outlet temperature when in heating mode. However, an interesting trend has been observed by some researchers in which the outlet temperature first decreases with increasing radius but then increases. The point at which this reversal begins is called the “critical radius” [84,86,88]. The reason behind such an interesting trend is the joint effect of low heat transfer coefficient and higher heat transfer area as the radius increases. In the analysis performed by Kumar et al. [86,88], they observed that the outlet temperature reduced in the cooling mode when the pipe radius was increased from 0.41 m to 0.52 m. This suggests that the increasing surface area of the underground pipe was the dominating factor over the reducing heat transfer coefficient. However, further increase in the radius of the underground pipe (0.58 and 0.70 m) caused the outlet temperature to increase, suggesting that the increase in heat transfer area was not large enough to overcome the impact of reducing heat transfer coefficient.
- Flow rate: Increase in flow velocity, and the mass flow rate causes higher outlet temperature when operating in cooling mode, and lower outlet temperature when operating in heating mode [2,6,15,36,44,45,55,85,86,88]. So, lower mass flow rate is typically considered a preferred situation, but may not result in the overall optimum performance. Bansal et al. investigated the impact of flow velocity (2.0, 3.2, 4.0 and 5.0 m/s) in both heating and cooling modes, and compared the results of the simulations with those from the experiments performed [9,10]. When the flow velocity increased from 2.0 m/s to 5.0 m/s, the total time spent by the air underground decreased by 2.5 times, which was the dominating factor compared to the 2.3 times increase in the heat transfer coefficient. They also observed that even though the reduction (or increase) in temperature was lower at higher flow velocities, the cooling (or heating) effect per unit time was higher. So, flow rate optimization is required depending on the application.
- Ground cover and soil type: Different ground covers, such as grass-covered soil, bare soil, high moisture soil, sand-covered soil etc., result in different thermal properties and underground temperatures [36,52,53,91,92]. Soil with high moisture content generally have better performance due to higher thermal conductivity, resulting in improved heat transfer with the underground pipes. Goswami et al. studied the variation of thermal conductivity with moisture content and time and showed its impact on the performance of the EAHE [45,46,47]. They observed that as the air passed through the pipes, and the surrounding soil was heated, the moisture from the pipe’s vicinity dissipated resulting in reduced thermal conductivity of the soil from the initial value of 1.1 W/m·K to less than 0.8 W/m·K. However, when the system was left idle off for 3 h, the moisture content in the soil was restored, and the thermal conductivity improved slightly to 0.9 W/m·K.
- Pipe material and thickness: Thermal conductivity of the pipe material can be an importance adder to the thermal resistance in the heat transfer process. Since the thickness of the buried pipe is generally very small (only a few millimeters), different materials do not result in very different thermal performances [9,10,36,90]. Bansal et al. compared the performance of two different materials (steel and PVC) for the underground pipes in both experimental and simulated conditions, and concluded that the overall performance and operation did not vary for the two materials [10]. The main reason for that was the larger contribution of the convective heat transfer coefficient compared to the conductive heat transfer coefficient on the overall heat transfer rate.
- Time: While analyzing the performance of an earth air heat exchanger, the earth is generally considered to be an infinite source or sink. The underground temperature is assumed to remain constant which is a valid assumption for systems that operate for a short duration. Even in cases where the underground temperature is impacted by the EAHE system, the change is very small. However, continued use of the EAHE system for a long time results in discharge (or extraction) of a large amount of heat to (or from) the earth. This may result in the permanent change of temperature in the area surrounding the buried pipes. Ileslamlou and Goswami examined an EAHE for 90 days, in which the system was operated for 16.5 h and then switched off for 7.5 h in a day [46,47]. During operation of the EAHE, the soil temperature increased, even though the increase was small. It then came down when the system was turned off. They observed that the resulting temperature after cool down was slightly higher than the starting temperature value. This trend continued for the entire time the EAHE was operated, resulting in a total increase at the outlet temperature by 2 °C [46,47].
- Air humidity: Relative humidity and moisture content of the air is another variable that needs to be considered in the design. If the air entering the pipes is at a high temperature and with high moisture content, condensation of water vapor could occur sooner along the pipe length [93]. Generally, if the air enters at a relative humidity of 30% or less, the probability of condensation is small. If condensation occurs at a large amount, it becomes important to pump out the condensate water at regular intervals to avoid corrosion and to ensure optimum performance.
2.5. Models
3. Night Sky Radiative Cooling
3.1. Principle
3.2. Configurations
3.2.1. Roof Pond
3.2.2. Flat Plate Radiators
3.3. Models
3.4. Effective Sky Temperature
4. Conclusions
- Ground coupled heat exchangers use the difference in temperature between ambient air and underground soil to cool the air in the summer and heat it in the winter
- Water can be used instead of air
- Earth air heat exchangers and ground coupled heat pumps have been used for air conditioning, and have been studied for use in condenser of a low temperature power generation system
- Choice depends on the location, season, application etc.
- Parameters that affect the performance of a ground coupled heat exchanger are depth, length of pipe, pipe radius, flow rate, ground cover and soil type, pipe material and thickness, and time
- Night sky radiative cooling allows for radiative heat transfer with the lowest temperature (~4 K) sink that is the sky
- Roof pond systems have been used to cool buildings
- Radiative heat transfer rate between the cooling body and the sky is heavily impacted by the ambient conditions such as wind speed, humidity, ambient temperature etc.
- Their combined effect is used to calculate the effective night sky temperature.
5. Declaration
Funding
Conflicts of Interest
Nomenclature
T | Temperature |
U | Overall heat transfer coefficient |
H | Convective heat transfer coefficient |
Cp | Specific heat |
m | Mass flow rate |
A | Differential area |
δ | Penetration depth |
r | Radial distance |
W | Humidity |
H | Enthalpy |
D | Diameter |
L | Length |
R | Thermal resistance |
k | Thermal conductivity |
q’ | Heat transfer per unit area |
IR | Infrared radiation |
T | Time |
V | Volumetric flow rate |
Subscripts | |
n | Element from inlet |
s | Surface of the tube |
e | Earth |
f | Fluid |
g | Gas |
o | Outer wall |
i | Inner wall |
th | Thermal |
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Reference | Model Details | Location |
---|---|---|
Cucumo [96] | 1-Dimensional heat transfer in soil for sinusoidal variation in air temperature. | Ahmedabad, India [97], Greensboro, NC [45], Athens, Greece [98] |
Goswami et al. [44,45,46,47] | 2-D iterative solution. Pipe was divided in many sections, and output from one was considered as input to the next. | Greensboro, NC, Gainesville, FL |
Mihalakakou [51] | Parametric model for overall heat transfer coefficient, U using radius, pipe length, depth and velocity. The coefficients of the polynomial were determined from empirical relations. | Athens, Greece |
Trombe [6] | 1-D heat transfer analysis on pipe sections. | Toulouse, France |
Gauthier [99] | 3-D numerical model. The entire region was divided into several control volumes, and finite difference analysis was used for solving heat transfer equation on each. | Quebec, Canada |
Kumar [87] | 2-D model using Neural Networks. | Mathura, India |
Kumar [95] | 2-D model using Genetic Algorithms. | Mathura, India |
Vaz [41] | Numerical solution based on finite volume analysis using ANSYS FLUENT. | Viamao-RS, Brazil |
Liu [100] | 3-D numerical model using cylindrical coordinates. Pipe length was divided into several elemental discs. | Chongqing, China |
Hollmuller [101,102] | 2-D numerical model. Pipe was divided into many sections, and energy balance was performed on each section iteratively. | Switzerland |
Reference | Model Description | Location |
---|---|---|
Zeng [107] | Thermal resistances between soil and fluid (R11), and the resistance between two pipes (R12 and R13) were calculated separately. | N/A |
Bose [109] | 1-D model for thermal resistance. | N/A |
Hart [110] | Underground soil is treated as an infinite sink and borehole as an infinite line source which has a heat rate of q1 per unit length. | N/A |
Sanaye [18,69] | Thermal resistance between the soil and the pipe is calculated. | Tuscaloosa, Alabama |
Lee [111] | 3-D solution using finite difference analysis in rectangular coordinates. | N/A |
Muraya [112] | Heat transfer analysis was done using transient finite-element method. | N/A |
Li [113] | 3-D finite volume model was developed with a triangular mesh. | Harbin, China [114] |
Bernier [106] | Average fluid temperature was calculated using g-function and thermal resistances [115]. | Le Bourget-du-Lac, France [116] |
Cui [117] | Numerical solutions using finite element method. | Hong Kong |
Ref. | System Description | Model Details and Underlying Assumptions | Experiment Location |
---|---|---|---|
Meir [133] | Inclined radiator panel connected with a water reservoir | Lumped model using [134,135] | Oslo, Norway |
Erell & Etzion [123,136,137] | Flat plate radiator to cool a building | Lumped model with a linearized form of Stefan-Boltzmann law proposed by [138] | Sede-Boqer, Israel |
Ali [27] | Open loop system with a hot water tank feeding into two parallel plate radiators | Lumped model applied on a number of sections along the radiator. Sky radiation calculations were obtained from [139] | Assiut, Egypt |
Tang & Etzion [140,141] | Roof pond that included gunny bags floating on top of the water surface | Roof pond had thermally stratification along the depth. Sky radiations were calculated with [142] Stratification: | Seder Boker, Israel (Results are shown in [143]) |
Tang & Etzion [140] | Roof pond with movable insulating layer | Roof pond is assumed to be perfectly stratified during the day and fully mixed at night. | Seder Boker, Israel (Results are shown in [143]) |
Sodha et al. [144,145] | Open roof pond | Lumped model with constant radiative and convective heat transfer coefficients. | New Delhi, India |
Clus et al. [146] | Funnel shaped radiative condenser | CFD analysis. | Corsica Island, France |
Jain [147] | Roof pond with movable insulation | Fourier expansion was used on lumped model of energy balance equation. Different heat transfer coefficients were determined using [148,149,150]. | Rajasthan, India |
Rincon et al. [151] | Roof pond with movable insulation | Numerical solution with finite volume method. Hourly data measured for outdoor temperature and solar irradiance was used. | Maracaibo, Venezuela |
Ali [118] | Thermally uninsulated open tank | Heat transfer analysis was performed on each wall of the tank using the lumped model. Sky radiation was calculated using [150]. | Assiut, Egypt |
Ito & Miura [152,153] | Radiator panels connected with water storage tank | Lumped model using radiative heat transfer calculation based on [150]. | Atsugi, Japan |
Spanaki et al. [154] | Roof pond covered with a protective floating cloth | Analysis of the thermally stratified water tank was done using the model proposed by Tang et al. [140,141]. | Heraklion city, Greece |
Dobson [132] | Radiator panel connected with a storage tank | Steady state lumped model for both storage tank and radiator. Sky emissivity was calculated using [155]. | Seder Boker, Israel [156] |
Ref. | Model | Location |
---|---|---|
Tang [142] | Negev Highlands, Israel | |
Berdahl and Fromberg [158] | during night during day | Arizona, Maryland, Missouri |
Berdahl and Martin [157] | Arizona, Texas, Maryland, Missouri, Florida, Nevada | |
Centeno [159] | Venezuela | |
Berger [160] | Carpentras, France | |
Chen [161,162] | during night during day | Nebraska and Texas |
S. No. | Model | Root Mean Square Error in Emissivity Value |
---|---|---|
1. | Berdahl & Fromberg | 0.0350 |
2. | Berdahl & Martin | 0.0272 |
3. | Centeno | 0.1907 |
4. | Berger | 0.0348 |
5. | Chen | 0.0246 |
6. | Tang | 0.0270 |
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Vidhi, R. A Review of Underground Soil and Night Sky as Passive Heat Sink: Design Configurations and Models. Energies 2018, 11, 2941. https://doi.org/10.3390/en11112941
Vidhi R. A Review of Underground Soil and Night Sky as Passive Heat Sink: Design Configurations and Models. Energies. 2018; 11(11):2941. https://doi.org/10.3390/en11112941
Chicago/Turabian StyleVidhi, Rachana. 2018. "A Review of Underground Soil and Night Sky as Passive Heat Sink: Design Configurations and Models" Energies 11, no. 11: 2941. https://doi.org/10.3390/en11112941