10
VI
https://doi.org/10.22214/ijraset.2022.44055
June 2022
International Journal for Research in Applied Science & Engineering Technology (IJRASET)
ISSN: 2321-9653; IC Value: 45.98; SJ Impact Factor: 7.538
Volume 10 Issue VI June 2022- Available at www.ijraset.com
Passive Cooling System to Provide Thermal
Comfort
Cleta Pereira1, Aaditya Sawant2, Raj Vaswani3, Rutvik Sanap4, Saurabh Yadav5
1, 2, 3, 4, 5
Department of Mechanical Engineering, Don Bosco Institute of Technology, University of Mumbai
Abstract: In a country like India, where temperatures may reach 40 degrees Celsius, everyone wants relief from the sweltering
heat, but only a few can afford it. As a result, passive cooling is a low or no energy approach that relies on heat gain
management and heat dispersion to offer thermal comfort. Heat Protection, Heat Modulation, and Heat Dissipation are the
three basic types of passive cooling systems. The combined effect of approaches from each category on a prototype room is
examined in this research, which includes shading and green roofs for heat protection, thermal mass (PCM) for heat
modulation, and cross ventilation for heat dissipation. Thermal mass is a term that describes a substance's ability to store heat.
The three primary phases of a Thermal Energy Storage (TES) system are thermal charging, thermal storage, and thermal
discharging. Phase Change Materials or PCM are latent heat storage materials. The roof is one of the most exposed parts of a
house to the sun, accounting for over half of the heat gain in a single-story home. As a result, heat protection might be a viable
option for lowering heat gain via the roof. A green roof, or a roof with vegetation, is one such system that operates on the
principle of evapotranspiration, which is the combined action of soil evaporation and plant transpiration. Another effective
method of heat shielding that is used in everyday life is shading. Shading is a basic technique for blocking sunlight before it
enters a structure by using structural components such as overhangs, light shelves, horizontal louvres, or blind systems. Cross
ventilation is a natural cooling method that uses wind to force cold air into a structure through an opening while driving warm
air out. Natural ventilation of this sort is low-cost and ensures that a structure is suitably cooled. There are many such different
passive cooling techniques used in different regions of the world in the form of individual as well as hybrid system. This project
focuses mainly on Hybrid Systems. Thus, the objective of this project is to integrate PCM and other secondary passive cooling
techniques for creating a hybrid passive cooling system to provide thermal comfort.
Keywords: Passive Cooling, Phase Change Material, Green Roof, Shading, Cross Ventilation.
I.
INTRODUCTION
The global population is rapidly increasing, which is accompanied by expansion in the industrial, transportation, agricultural, and
infrastructural sectors, among other areas. Heating, air conditioning, ventilation, cooling, and others are the most significant
elements of energy use in the construction industry. As a result, passive cooling techniques and systems must be designed to
eliminate energy consumption, maintain the ecosystem and environment, and provide enough comfort. Thus, the current study
outlines a hybrid passive cooling system that provides thermal comfort.
Passive cooling strategies reduce the rise in the building temperature caused by heat sources such as surrounding air, building
internal heat gain and direct solar heat gain by using surrounding cooling sinks such as building material, air, night sky, water and so
on. Passive cooling techniques are divided into mainly 3 types - Heat Protection, Heat modulation and Heat Dissipation.[1]
1) Heat Protection, which shields the structure from direct solar heat gain.[1]
2) Heat Modulation, in which the heat gain of a structure is regulated using the thermal energy storage capacity of the structure.[1]
3) Heat Dissipation, in which surplus heat from the building is rejected to a lower temperature ambient heat sink.[1]
The hybrid system being studied has techniques from each of the above typesa) Green Roof and Shading for Heat Protection.
b) PCM for Heat Modulation.
c) Cross Ventilation for Heat Dissipation.
During phase transition, latent heat storage materials, commonly known as PCM (Phase Change Material), store and reject heat.
During the day, PCM gathers heat in the form of latent heat from the building's glazed and opaque surfaces and melts at a steady
temperature. As a result, the building's internal temperature is controlled and decreased. PCM's accumulated latent heat is removed
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throughout the night. Passive cooling achieves heat dissipation from PCM by natural mechanisms, whereas active cooling achieves
heat rejection with the use of air conditioning equipment, which comes at a cost in terms of power.
Planting vegetation on and around the building envelope is a very ancient practice for lowering elevated temperatures around
structures. Green roofs or planted roofs, employ vegetation to enhance the appearance, performance, or both of a roof's
components.[1]
Green roof can be divided into two types
Extensive roofs which are light and are covered by a thin layer of plants.
Intensive roofs which are heavier and can support small trees and shrubs.
Green Trees and plants aid in the cooling impact by absorbing heat from the environment via the process of evapotranspiration.[1]
With the employment of architectural components such as overhangs, horizontal louvres, light shelves, blind systems, or façade and
fenestration, shading reduces insolation and heat gain in structures. Shading is a simple technique to block sunlight before it enters
the building. Various shading systems can be used to shade the building, reducing incident solar radiation and efficiently cooling it,
which has an impact on the building's energy efficiency.[1]
Cross ventilation is the utilization of openings on different sides of a room to induce a circulation of air throughout the space. If both
sides of the room are open, the high pressure on the exposed side and/or the low pressure on the other, sheltered side will cause a
stream of air to flow from the exposed to the protected side. [19]
Thus, the objectives of this project are To understand and research the variable properties of PCMs which would give effective cooling in the residential houses.
To select an effective PCM (phase change material) which would be ideal for providing cooling comfort.
To use a secondary passive cooling technique in unison with PCM to provide thermal comfort at a lower cost.
To analyze, design and build a prototype of a small room with PCM and the supporting passive techniques.
II.
DESIGN AND FABRICATION OF PROTOTYPE ROOM
A. Design of Prototype Room
1) Dimensions of Prototype Room
A normal room in India is considered to be of area 10 ft X 10 ft.
So, the actual dimensions are scaled down and a small room with inside dimensions 3.5 ft X 3 ft, with a height of 3ft is finalized.
This Room is then designed in solidworks software with dimensions as mentioned below -
Fig. 1 Design of Prototype Room with dimensions
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B. Construction of Prototype Room
For feasibility and easy handling of the room for carrying out the experimentation, the room has been constructed on a movable
trolley
Fig. 2 The room ready with plastering
C. Incorporation of PCM
1) Selection of PCM
PCMs can minimize cooling system energy consumption and interior temperature changes; however, various selection criteria must
be addressed before.
PCMs can be efficiently applied in the building structure for passive cooling. To ensure thermal comfort for occupants,
The freezing temperature of the PCM must lie in between 10°C to 30°C from a physical standpoint.
It should possess a high latent heat per unit volume thermodynamically, which is necessary in construction purposes since it
means the PCM can absorb/release more energy with less volume, resulting in a lighter built environment.
It must have a high specific heat capacity (Cp). Its ability to transmit heat is another key thermodynamic property (conductivity).
It should have low volume expansion, chemical stability, and minimum or no super-cooling while freezing.
PCMs must also be non-corrosive, non-toxic, non-explosive and non-flammable.
It should be stable across a number of melting/freezing cycles or have strong cycling stability. Long-term stability is another
phrase for this.
The last criteria, which takes precedence over all others, is economics. A PCM must be affordable and readily available in the
market.
PCMs are categorised into three groups in general, as illustrated below:
Organic PCMs - Organic PCMs are those with C-H bonds and are categorized into two groups: Paraffins (Alkanes) and NonParaffins.
In-organic PCMs - There are no C-H bonds in these PCMs. Metallic PCMs and Salt hydrates are the two types.
Eutectic PCMs are made up of at least two different PCMs.
Organic PCMs, such as paraffins, and non-organic PCMs, such as salt hydrates, are the best candidates for thermal energy storage.
Inorganic PCMs possess a greater heat of fusion per unit mass, but they are less costly and flammable in comparison (usually). As a
result, salt hydrate PCM is used for this investigation. In comparison with organic PCMs, salt hydrates are promising for heat
storage in buildings because of their high volumetric storage density (350 MJ/m3), strong thermal conductivity (0.5 W/mK), and
low cost. The PCM should be chosen such that its melting point falls within the range of the daily average temperatures of the site
under consideration. For Mumbai, the daily temperature ranges from 25°C to 35°C (and can even reach 40°C in summer). Hence
PCM having melting point around 27-29 °C will be more suitable. From the available PCMs,
is selected because of the
.6
easy availability.
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TABLE I
PROPERTIES OF PCM
Property
Appearance
Value
Transparent Liquid with white suspension
Melting point
29 ℃
Latent Heat
190 kJ/kg
Liquid sp. Heat
2.3 kJ/(kg K)
Thermal Stability
2000 cycles (approx.)
2) Encapsulation of PCM
Although CaCl2.6H2O is a good Phase change material in terms of cost, temperature and safety, it is known to be very corrosive
because it is a chloride-based salt. Hence encapsulation of PCM is necessary before applying. For encapsulation, used milk pouches
made of LDPE are used. LDPE provides excellent puncture resistance, superior seal strength and is also amenable to low
temperature storage. This way also helps in the waste management of the plastic bags. Empty milk pouches are first cleaned
thoroughly and dried. Then the pouches are cut open from one side. Heat sealer is used to seal the pouch from the middle in the
vertical direction to form two partitions within the pouch. 10 mL of PCM is then poured in both the partitions. Again, the pouch is
sealed from the middle but in a horizontal direction which creates 4 partitions in the pouch. Same volume of PCM is poured in the
above partitions and finally sealed from top. A curtain containing 4 PCM filled pouches is made by attaching an empty pouch
between two PCM filled pouches. Four such curtains are placed on the south wall with some spacing between them. The figure 3
shows the encapsulation of PCM in a milk pouch.
3) Experimental Setup for PCM
The wall where PCM is mounted has a considerable effect on the room's cooling load. When compared to other walls of the
construction, PCM, when applied on the south and west walls has a larger cooling load reduction.[4]. PCM cooling will be done by
cross ventilation and windows for cross ventilation are made on east and west walls. Hence, the curtains made as mentioned in the
previous subchapter are applied to the south wall of the constructed prototype room. Four such curtains are placed on the south wall
with some spacing between them.
Fig. 3 PCM filled Milk Pouches
Fig. 4 Actual Experimental Setup for PCM
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D. Green Roof
1) Layers of Green Roof
TABLE II
FUNCTIONS OF DIFFERENT LAYERS OF GREEN ROOF
Layer
Function
Greenery
Plants and vegetation
Soil
Growing medium for the plants
Filtration Sheet
It filters the tiniest soil particles while allowing water to pass through.
Drainage layer
The drainage layer's purpose is to recreate natural conditions for growth of
vegetation. It collects water through small tanks on the upper side, but it also
allows surplus water to flow through tiny holes.
Retention sheet
Particles that have dropped down from the top layers are collected in this
layer.
Anti-Root barrier
Prevents growing of roots that may damage the structure.
Waterproofing
layer
Prevents water from damaging the roof, leakage.
2) The Actual Roof
Based on the size of the room and the working conditions, some of the layers explained in the previous sub chapter are incorporated
in the prototype room. For construction of the Actual Green Roof, a square wooden frame is made using wooden planks in order to
hold all the layers i.e., soil, stones, etc. in place. The layers are added one over the other in the order mentioned in figure 5.
Fig. 5 Actual Layers Used in the green roof
Fig. 6 Actual Green Roof
E. Shading
For the testing of the shading technique, we have two windows of dimensions - length 24 inch and a height of 18inches. Both of
them will have an overhang of length 25 inch and breath of 12 inch. The dimension of the overhang is considered by considering the
solar azimuth and solar altitude angles for Mumbai of the month of highest temperature i.e., May and lowest temperature i.e.,
December.
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F. Cross Ventilation
For the testing and implementation of Cross Ventilation in our prototype, we have kept two windows of dimensions – length 24
inches and height of 18 inches exactly opposite to each other. Summer winds blow from the south-west to the north-east, whereas
winter winds blow to south west from the north east. The windows in our prototype are on the east and west facing in opposite
directions. Thus, proper cross ventilation can be adopted in our prototype and necessary drop in temperature can be achieved.
Fig. 7 Prototype room with all passive cooling techniques
A.
1)
III.
EXPERIMENTATION
Instrumentation
Sensors and Temperature Indicator
Thermocouple wire bundle of 30 meters is brought and the wires are cut according to length from each wall.
Thermocouple wires used are of K-type (Chromel-Alumel) along with temperature indicator.
The 2 ends of the wire are attached to the wall and across the terminals of the temperature indicator respectively.
Temperature indicator – ES POINT Model TXI-01 Digital temperature indicator.
2) Calibration
The Thermocouple wires are calibrated using two-point method by comparing the output of the thermocouple wires with that of a
calibrated thermometer in two cases –
Temperature of Ic
Temperature of Boiling Water.
B. Temperature Measurement
Temperature was measured at 12 points:
1) Inside and outside of all the 4 walls (8).
2) Above and below the roof (2).
3) Centre of the room (1).
4) Ambient temperature (1).
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C. Experimentation Procedure
The steps followed for measurement and recording of temperature are mentioned below5) The Prototype room is built on a trolley and kept inside a shed. So, it is first pulled out of the shed to the selected location
where the room is exposed to sun properly without any shade falling on it for accurate results.
6) Extension boards are set up for providing power supply to the temperature indicator.
7) Thermocouple wires are already connected to the temperature indicator. The temperature indicator is placed at a suitable
position such that length of wires is perfect to reach the designated wall.
8) The ends of thermocouple wires are fixed to the walls and the temperature indicator is switched on.
9) The knob of temperature indicator is switched to position 1 and the temperature at other end of thermocouple wire connected to
port 1 is displayed on the indicator.
10) After the fluctuation in temperature stops and constant temperature is displayed, that temperature is recorded for the respective
wall or location in the observation table.
11) The knob of temperature indicator is then turned to position 2 and same steps are followed.
12) The above procedure is followed for 6 readings from 12:00 PM to 05:00 PM with an interval of 1 hour after every reading.
The above procedure is followed for recording temperatures in 3 cases:
Prototype room without any passive cooling technique
Prototype room with Cross Ventilation.
Prototype room with all the passive cooling techniques i.e., hybrid model.
IV.
RESULTS AND DISCUSSION
A. Room Centre vs ambient temperature
The following tables shows the Temperature of room centre and the ambient temperature in all the three cases1) Prototype Room Without Windows
Centre
Ambient
T11
T12
38
41
TABLE III
ROOM CENTRE AND AMBIENT TEMPERATURES
(PROTOTYPE ROOM WITHOUT WINDOWS)
38
37
37
40
39
39
37
38
34
34
34
34
TABLE IV
ROOM CENTRE AND AMBIENT TEMPERATURES
(PROTOTYPE ROOM WITH WINDOWS)
34
36
32
36
36
34
32
32
32
34
(PROTOTYPE ROOM WITH ALL PASSIVE COOLING TECHNIQUES)
29
29
33
33
33
33
33
34
34
34
32
33
2) Prototype Room with Windows
Centre
Ambient
T11
T12
3) Prototype Room with All Passive Cooling Techniques
TABLE V
ROOM CENTRE AND AMBIENT TEMPERATURES
Centre
Ambient
T11
T12
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The following figure shows a graph comparing the Temperature of room centre and the ambient temperature in all the above cases-
Fig. 8 Room Centre vs Ambient Temperature
B. Outside Surface vs Inside surface of the wall (South Wall)
The following table shows the Temperature on the outside surface and inside surface of the south wall in Case 1(Room without
Windows) and Case 3 (Room with all Passive Cooling Techniques)1) Prototype Room Without Windows
TABLE VI
OUTSIDE AND INSIDE TEMPERATURES OF SOUTH WALL
South Outside
South Inside
T2
T6
41
35
(PROTOTYPE ROOM WITHOUT WINDOWS)
42
40
40
37
38
39
40
38
38
36
TABLE VII
OUTSIDE AND INSIDE TEMPERATURES OF SOUTH WALL
(PROTOTYPE ROOM WITH ALL PASSIVE COOLING TECHNIQUES)
34
34
39
38
37
30
30
33
33
33
35
33
2) Prototype Room with All Passive Cooling Techniques
South Outside
South Inside
T2
T6
The following figure shows a graph comparing the Temperature on the inside surface and outside surface of the south wall in the
Case 1 (Room without Windows) and Case 3 (Room with all Passive Cooling Techniques)-
Fig. 9 Graph of Inside vs Outside surface temperature of south wall
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A.
B.
C.
D.
E.
F.
G.
H.
V.
CONCLUSION
Different types of Passive cooling techniques are Researched and studied and Phase Change Material is selected as the Primary
passive cooling technique.
Along with Phase Change Material, Green Roof, Shading and Cross Ventilation are selected as Secondary Passive Cooling
Techniques.
Variable properties of PCM are studied and an effective PCM is selected which would be ideal for providing cooling comfort.
A prototype of a small room with PCM and the supporting passive techniques is designed and built and the difference before
and after applying passive cooling is noted.
From the observations in table III, IV and V and graph in figure 8, it can be observed that in case of temperature measurement
with Passive Cooling, a temperature drop of up to 3oC is observed as compared to that without any Passive Cooling Method.
As a result, the Hybrid system of multiple Passive Cooling Techniques is successful in lowering the prototype room's interior
temperature.
From the observations in table VI and VII and graph in figure 9, it can be observed that there is a difference in temperature of 45oC between the inside surface and outside surface of the South Wall (The wall on which PCM is applied).
Thus, the Primary Passive Cooling Technique i.e., Phase Change Material is successful in lowering the interior wall
temperature of the prototype room.
VI. ACKNOWLEDGMENT
We would like to thank Don Bosco Institute of Technology, Department of Mechanical Engineering, and by extension the
University of Mumbai, for providing us the education and skill set required to work on our project.
We would especially like to thank our Principal Dr. P. Nambiar and the Management of Don Bosco Institute of Technology for
giving us the permissions and space for carrying out the construction as well as experimentation of our project.
We would especially like to thank our guide Prof. Cleta Periera of the Mechanical Engineering Department for their valuable insight
about our project, and unwavering assistance in completing our tasks. We would also like to thank Prof. Mahesh Rajwade for their
valuable guidance regarding the material science aspects of our project. We would also like to thank Prof. Sandeep Sabnis for their
valuable guidance during the evaluation and workings of our project. Lastly, we are also grateful to the Workshop Staff of our
Department for helping us out with the fabrication of the prototype.
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