Shade Is Usability Infrastructure: What Malaysian Campus Studies Show

Fri, 17 Apr 2026 09:00:00 +0800

Evidence note. This article synthesises published Malaysian campus studies, field measurements, questionnaire-based thermal-comfort evidence, and urban-climate project data. It does not report new field measurements, a site survey, or original interviews.

Why shade should be treated as infrastructure

On a campus, outdoor space is often counted as if its physical existence is enough: a plaza, a walkway, a courtyard, a lawn, a bus stop, a bench. In a hot-humid climate, this is a weak way to judge outdoor quality. A space may exist on the site plan, but still fail in daily use if students cannot comfortably walk, wait, sit, meet, or study there during the hours when they actually need it.

That is why shade should be treated as usability infrastructure, not as landscape decoration.

This article does not argue that shade directly improves academic performance. That would require learning-outcome data. The narrower and stronger argument is this:

In Malaysian campus environments, shade affects whether outdoor routes and spaces are thermally tolerable enough to be used for walking, waiting, sitting, socialising, and informal study.

The strongest evidence comes from Malaysian campus thermal-comfort studies. These studies show that shade can change pedestrian-level thermal conditions in measurable ways: by lowering surface temperature, reducing mean radiant temperature, and improving Physiologically Equivalent Temperature (PET)-based comfort conditions (Makaremi et al., 2012; Ghaffarianhoseini et al., 2019; Kasim et al., 2019).

Cover image. University of Malaya outside engineering faculty pavement. Photograph by Vincent60030, Wikimedia Commons, CC BY-SA 4.0.

Original chart redrawn from reported Malaysian campus-study values. Surface-temperature and PET differences are from Kasim et al. (2019). The mean radiant temperature range is from Ghaffarianhoseini et al. (2019).

Malaysia’s climate makes outdoor usability a design problem

Malaysia’s climate is not defined by occasional summer heat. It is a year-round hot-humid setting with relatively uniform temperature, high humidity, substantial rainfall, and generally light winds (Malaysian Meteorological Department, n.d.). For campus design, this matters because outdoor comfort is shaped not only by air temperature, but also by solar radiation, surface heat, humidity, wind movement, rain protection, and the amount of usable shade.

Official Malaysian climate data also makes it possible to frame this issue with measured national context. The Malaysian open-data portal provides a dataset on mean temperature, rainfall, rainfall days, and mean relative humidity for Malaysia from 2000 to 2021, sourced from the Malaysian Meteorological Department (Department of Statistics Malaysia, 2023). Such data is useful for background charts, but it should not replace campus-scale evidence. A national climate dataset tells us the general climatic context; it does not tell us whether one campus walkway, bus stop, or seating area is usable at 1 pm.

For outdoor-space design, the more practical questions are local:

Is the walking route continuously shaded?
Are waiting areas protected from direct sun and rain?
Are seats placed where people can actually use them?
Does shaded space still allow air movement?
Are hot ground surfaces exposed or shaded?

These are not only aesthetic questions. They are usability questions.

A tree-shaded campus route. The design question is not only whether trees exist, but whether shade follows the actual walking line used by students and staff.
Photo: Cerevisae, Wikimedia Commons, CC BY-SA 4.0

What Malaysian campus studies show

1. Shaded outdoor spaces can extend acceptable comfort periods

Makaremi et al. (2012) studied shaded outdoor spaces at Universiti Putra Malaysia. The study used field measurement and questionnaire data, with local and international students as respondents, and applied the PET thermal comfort index. This is highly relevant for Malaysian campus discussion because it links shade, student thermal perception, and outdoor thermal comfort in the same study setting.

The key design finding is not simply that shaded spaces are better. It is more specific: higher shading levels can extend the period during which outdoor thermal conditions remain acceptable. In the study, acceptable thermal comfort was mainly found in the early morning and late afternoon, while high-shade locations extended acceptable conditions further into the morning (Makaremi et al., 2012).

For campus planning, the implication is direct. A courtyard or walkway should not be judged only by how it looks at 8 am. It should be considered during the hours when solar exposure is more severe and when students still need to move across campus.

2. Walkway shade can reduce surface temperature by about 6-7°C

Kasim et al. (2019) compared five types of Landscape Environmental Settings for Pedestrians in a tropical university campus environment:

Code	Walkway setting
T1	No shade
T2	Metal-deck shade
T3	One row of trees
T4	Combined deck and trees
T5	Two rows of trees

The study measured air temperature, globe temperature, surface temperature, wind velocity, and relative humidity, then used the PET index to assess pedestrian thermal comfort. Measurements were carried out during the hottest part of the day, from 12:00 to 15:00 (Kasim et al., 2019).

The surface-temperature result is particularly useful because it is easy to understand. The unshaded walkway recorded a mean surface temperature of 40.7°C. The shaded settings recorded lower mean surface temperatures: 34.4°C under a metal deck, 34.6°C under one row of trees, 34.0°C under a combined deck-and-tree setting, and 33.8°C under two rows of trees (Kasim et al., 2019).

Original chart redrawn from mean surface-temperature values reported by Kasim et al. (2019). The chart should not be read as a universal value for every campus; it shows measured differences in the studied tropical campus walkway settings.

The difference between no shade and two rows of trees is approximately 6.9°C in mean surface temperature. That is not a small decorative effect. It changes the thermal condition of the pedestrian environment.

The same study also reported PET differences between the unshaded setting and shaded settings. Compared with no shade, the PET difference was 6.11°C for the metal deck, 4.16°C for one row of trees, 5.43°C for the combined deck-and-tree setting, and 6.74°C for two rows of trees (Kasim et al., 2019).

The design lesson is sharp: continuous shade matters more than symbolic greenery. One row of trees can help, but gaps between trees may still expose pedestrians to direct radiation. Two rows of trees, or sufficiently wide built shade, can provide a more stable shaded corridor.

3. Fully shaded spaces can sharply reduce mean radiant temperature

A study at the University of Malaya in Kuala Lumpur compared fully shaded, partially shaded, and unshaded campus outdoor spaces. It used field measurements and simulations to assess microclimatic conditions and thermal comfort (Ghaffarianhoseini et al., 2019).

One of the most important variables in this study is mean radiant temperature, or Tmrt. Tmrt matters because pedestrians do not only feel air temperature. They also receive radiant heat from the sun and surrounding surfaces. This is why a shaded space can feel meaningfully different even if the air temperature difference is modest.

Ghaffarianhoseini et al. (2019) reported that fully shaded areas had considerably lower Tmrt values than unshaded areas. The difference between fully shaded and unshaded areas was approximately 32°C at 10:00, 25°C at 12:00, 24°C at 14:00, and 26°C at 16:00.

Original chart redrawn from Table 4 in Ghaffarianhoseini et al. (2019). The unshaded value shown here is the average of the two unshaded spots reported in the source table.

This is the strongest evidence for the phrase “shade is infrastructure”. If shade can change radiant exposure by this scale, it is not merely visual greening. It is part of the functional performance of outdoor space.

The same study also warned that greenery does not automatically guarantee comfort. Trees need to be properly designed in terms of number, type, size, and location. Fragmented shade may not be enough, especially during the critical daytime period when solar exposure is high (Ghaffarianhoseini et al., 2019).

4. Building shade also matters

Tree shade is important, but it should not be the only strategy. In an urban university campus study in Malaysia, Zaki et al. (2020a) examined the relationship between outdoor air temperature and urban morphology parameters such as green cover ratio, height-to-width ratio, and sky view factor. Their study recorded outdoor air temperatures at eight campus locations over seven days.

A related study focused more specifically on building-induced shadows in a hot-humid urban university campus. It measured outdoor air temperature at eight locations and used AutoCAD Revit to generate building-shadow patterns (Zaki et al., 2020b). The useful lesson is that campus shade can be produced by both landscape and building morphology: trees, roofed walkways, arcades, adjacent building blocks, and shaded courtyards.

This matters for real campuses. Mature tree canopy takes time. Built shade can sometimes provide immediate protection along priority routes while tree canopy develops. The better strategy is not “trees versus buildings”, but tree shade plus built shade plus ventilation-aware layout.

Built shade can provide immediate protection along priority pedestrian routes while tree canopy matures. The design issue is not trees versus structures, but how different shade systems work together.
Photo: Wee Hong, Wikimedia Commons, CC BY-SA 4.0

Usability: what shade enables

The term “usability” is normally associated with product design or digital interfaces, but it is also useful for landscape analysis. A campus outdoor space is usable when people can perform ordinary campus activities without excessive environmental friction.

In hot-humid campus environments, shade affects at least five ordinary activities.

Activity	Why shade matters
Walking	Shaded routes reduce exposure during daily movement between buildings.
Waiting	Bus stops, entrances, crossings, and queues become more tolerable when shaded.
Sitting	Benches without shade may exist physically but fail behaviourally.
Socialising	Informal conversation often depends on comfort at edges, courtyards, and transitional spaces.
Outdoor study	Study spots need shade, seating, low glare, and some air movement.

The weakness of many outdoor-space discussions is that they count space without testing use. A plaza may look open and impressive, but if its surface is exposed, seats are unshaded, and the nearest route has no protection, the space may become a transit zone rather than a lived campus place.

Shade also matters at stopping points, not only along routes. Waiting, meeting, and informal study spaces need protection, seating, and air movement.
Photo: PeaceSeekers, Wikimedia Commons, CC BY-SA 4.0

This is why a campus shade discussion should ask not only “is there greenery?” but also:

Is there enough shade, in the right location, during the hours when people need the space?

Not all shade performs equally

A weak interpretation of the evidence would be: “plant more trees”. That is too simple.

The Malaysian evidence points to a more precise conclusion. Shade performance depends on continuity, width, canopy density, surface material, wind conditions, and the activity supported by the space.

Kasim et al. (2019) found that wider shading improved comfort. In their study, a metal-deck shade of 3.43 m performed better than a combined deck-and-tree setting of 2.5 m, and the 0.93 m difference was associated with a shift in comfort category from “warm” to “slightly warm”. The study suggested a minimum man-made shade width of 3.4 m for better pedestrian comfort.

This matters because narrow shade strips often fail in practice. A covered walkway that does not shade the actual walking line during the hottest period may perform poorly. A tree row with large gaps may create intermittent comfort rather than a continuous usable route. A shaded bench facing glare or placed on a hot hardscape may still be avoided.

Shade quality depends on canopy form, placement, and how well protection aligns with the spaces people actually use. Tree presence alone is not enough if the real walking, sitting, or waiting areas remain exposed.
Photo: Chaoyang Sunrise, Wikimedia Commons, CC BY-SA 4.0

A good campus shade strategy should therefore combine:

Continuous route shade along major pedestrian paths.
Wide enough shade to cover real walking and waiting positions.
Shade at decision points, such as crossings, building entrances, bus stops, and queue areas.
Shaded seating, not only shaded circulation.
Surface-temperature control, especially over asphalt, concrete, and paved plazas.
Ventilation-aware design, because shade without air movement may still feel stagnant.
Rain compatibility, because hot-humid Malaysia also requires protection from frequent rainfall.

Surface materials matter too

Shade is only one part of the outdoor thermal environment. Ground material can amplify or reduce heat stress.

Benrazavi et al. (2016) studied pavement materials in Putrajaya and found substantial differences in surface temperature among pavement types. Their findings matter for campus design because many campus routes, plazas, parking edges, and bus-stop areas use hard materials such as asphalt, concrete, and stone. If these materials are exposed to direct sun, they can store and re-radiate heat into the pedestrian environment.

This supports a more complete design principle: shade should be paired with surface-temperature control. A tree-lined route with exposed asphalt may still feel harsh at midday. A roofed walkway with poor ventilation and heat-storing surfaces may also underperform. The best campus shade strategy should therefore consider canopy, roof cover, pavement, seating material, glare, and air movement together.

Evidence translated into design implications

The following table summarises what the published evidence supports. It is not a scoring tool and it does not represent new site data.

Evidence from studies	Design implication
Shaded UPM outdoor spaces extended acceptable comfort periods (Makaremi et al., 2012).	Evaluate outdoor spaces by usable hours, not only by appearance.
Shaded UPM walkway settings reduced mean surface temperature compared with no shade (Kasim et al., 2019).	Prioritise shade along high-use walking routes.
Fully shaded UM spaces had much lower mean radiant temperature than unshaded spaces (Ghaffarianhoseini et al., 2019).	Reduce direct solar exposure at seating, waiting, and movement zones.
Wider shade improved pedestrian comfort in the campus walkway study (Kasim et al., 2019).	Avoid narrow or fragmented shade strips that miss the actual pedestrian line.
Building-induced shadows and green cover affected outdoor air temperature in UTMKL studies (Zaki et al., 2020a, 2020b).	Treat building form, covered walkways, sky view, and tree canopy as one microclimate system.
Pavement studies in Malaysia show material-dependent surface-temperature differences (Benrazavi et al., 2016).	Pair shade with cooler surface materials, especially in plazas and waiting areas.

Wider Malaysian policy and project context

The campus evidence also fits wider Malaysian climate-adaptation concerns. Urban heat is increasingly discussed through land-surface temperature, greening, and nature-based solutions.

Think City’s Penang Nature-based Climate Adaptation Programme frames urban greening as a way to reduce urban temperatures and improve climate resilience. The programme includes tree-lined streets, pocket parks, greening of car parks, green facades, and green rooftops (Think City, n.d.). The Adaptation Fund project page for the Penang programme also describes nature-based solutions as a means to reduce surface temperatures and stormwater runoff in urban areas (Adaptation Fund, n.d.).

This wider context does not prove that every campus has the same shade problem. However, it shows that shade, vegetation, surface temperature, and outdoor comfort are already part of Malaysia’s climate-adaptation conversation.

For campuses, the practical implication is straightforward: shade should not be treated as leftover landscape beautification after buildings and roads are fixed. It should be planned as part of circulation, waiting, sitting, and everyday outdoor use.

What the evidence allows us to say

The available Malaysian evidence supports several careful claims.

First, campus shade has measurable thermal effects. Studies in Malaysian university settings have linked shade to lower surface temperature, lower mean radiant temperature, and improved PET-based comfort conditions (Makaremi et al., 2012; Ghaffarianhoseini et al., 2019; Kasim et al., 2019).

Second, shade continuity matters. A route with fragmented shade is not equivalent to a route with continuous shade. Gaps between trees or narrow shade strips can expose pedestrians to direct solar radiation at the exact points where protection is needed.

Third, greenery alone is not enough. The number, type, size, location, and density of trees affect whether shade becomes functional. A campus can be visually green but still thermally uncomfortable if shade does not align with walking routes, seating areas, and waiting points.

Fourth, built shade should be considered part of the design toolkit. Covered walkways, arcades, roof overhangs, and building-induced shade can complement tree planting, especially along high-use routes.

Fifth, shade should be evaluated together with surface material and ventilation. A shaded space can still underperform if it traps heat, blocks air movement, or exposes users to glare and hot hardscape surfaces.

What the evidence does not prove

The evidence has clear limits.

The studies reviewed here do not prove that shade directly improves grades, concentration scores, or learning performance. They support a more specific claim: shade improves the thermal usability of campus outdoor environments.

It also does not include original interviews, original user surveys, or new site measurements. The evidence comes from published literature, project documentation, official climate data, and Creative Commons example photographs.

The evidence also does not imply that every Malaysian campus has the same problem. Microclimate is site-specific. Building layout, tree maturity, paving material, slope, wind movement, rainfall pattern, and daily maintenance all matter.

A more precise conclusion is:

Shade is a necessary condition for usable outdoor campus life in hot-humid Malaysia, but it must be designed as a continuous, activity-based, and climate-responsive system.

Design implications for Malaysian campuses

Based on the evidence reviewed above, campus shade planning should move from decoration to performance. A campus landscape plan should not only show green patches. It should identify shaded movement, shaded waiting, shaded sitting, and shaded outdoor learning possibilities.

A practical design brief could include the following requirements:

Map the main pedestrian routes between lecture halls, libraries, food courts, hostels, transit points, and administrative buildings.
Identify exposed route segments during midday.
Prioritise continuous shade on high-use routes before beautifying low-use lawns.
Add shade at waiting and decision points, not only along straight paths.
Combine tree canopy with built shade where immediate protection is needed.
Place benches and outdoor study furniture only where shade and ventilation make them usable.
Reduce exposed asphalt and hard paving in high-use pedestrian zones.
Maintain trees and shade structures as infrastructure, not as optional landscape extras.

This is the main shift: shade should be planned around what people do, not only around what looks green on a masterplan.

Conclusion

Malaysian campus studies make a strong case for treating shade as outdoor usability infrastructure. The strongest evidence is not about academic performance. It is about thermal comfort, walkability, surface temperature, mean radiant temperature, and the real ability to use campus outdoor spaces.

A shaded campus is not simply a greener campus. It is a campus where outdoor routes, waiting spaces, seating areas, and informal social spaces are designed for the climatic conditions people actually experience.

In hot-humid Malaysia, the question should not be only:

How much open space does the campus have?

The better question is:

How much of that outdoor space is usable when students actually need it?

Graphic, photo, and copyright note

The charts in this article are original redrawn graphics based on numerical values reported in the cited studies. They are not copied screenshots or reproduced figures from the original papers.

The featured image and campus photos are Creative Commons images from Wikimedia Commons and are reused with attribution in the figure captions. They are not copyright-free. If the photos are reused, keep the author, source, and licence information.

Please cite the original academic sources when reusing the data or discussing the findings.

References

Adaptation Fund. (n.d.). Nature-based climate adaptation programme for the urban areas of Penang Island. https://www.adaptation-fund.org/project/nature-based-climate-adaptation-programme-for-the-urban-areas-of-penang-island-2/

Benrazavi, R. S., Dola, K., Ujang, N., & Benrazavi, N. S. (2016). Effect of pavement materials on surface temperatures in tropical environment. Sustainable Cities and Society, 22, 94-103. https://doi.org/10.1016/j.scs.2016.01.011

Department of Statistics Malaysia. (2023). Mean temperature, rainfall and mean relative humidity, Malaysia, 2000-2021 [Data set]. https://archive.data.gov.my/data/dataset/mean-temperature-rainfall-and-mean-relative-humidity-malaysia

Ghaffarianhoseini, A., Berardi, U., Ghaffarianhoseini, A., & Al-Obaidi, K. M. (2019). Analyzing the thermal comfort conditions of outdoor spaces in a university campus in Kuala Lumpur, Malaysia. Science of the Total Environment, 666, 1327-1345. https://doi.org/10.1016/j.scitotenv.2019.01.284

Kasim, Z., Shahidan, M. F., Ujang, N., & Dahlan, N. D. (2019). Influence of landscape environmental settings on outdoor pedestrian thermal comfort in tropical climate. Alam Cipta, 12(2), 73-84. https://spel2.upm.edu.my/webupm/upload/dokumen/20191231083712Paper_8_Dec_2019.pdf

Makaremi, N., Salleh, E., Jaafar, M. Z., & GhaffarianHoseini, A. (2012). Thermal comfort conditions of shaded outdoor spaces in hot and humid climate of Malaysia. Building and Environment, 48, 7-14. https://doi.org/10.1016/j.buildenv.2011.07.024

Malaysian Meteorological Department. (n.d.). Malaysia’s climate. https://www.met.gov.my/en/pendidikan/iklim-malaysia/

Shahidan, M. F., Jones, P. J., Gwilliam, J., & Salleh, E. (2012). An evaluation of outdoor and building environment cooling achieved through combination modification of trees with ground materials. Building and Environment, 58, 245-257. https://doi.org/10.1016/j.buildenv.2012.07.012

Think City. (n.d.). Penang Nature-based Climate Adaptation Programme. https://thinkcity.com.my/our-work/penang-nature-based-climate-adaptation-programme

Zaki, S. A., Othman, N. E., Syahidah, S. W., Yakub, F., Muhammad-Sukki, F., Ardila-Rey, J. A., Shahidan, M. F., & Mohd Saudi, A. S. (2020a). Effects of urban morphology on microclimate parameters in an urban university campus. Sustainability, 12(7), Article 2962. https://doi.org/10.3390/su12072962

Zaki, S. A., Syahidah, S. W., Shahidan, M. F., Ahmad, M. I., Yakub, F., Hassan, M. Z., & Md Daud, M. Y. (2020b). Assessment of outdoor air temperature with different shaded area within an urban university campus in hot-humid climate. Sustainability, 12(14), Article 5741. https://doi.org/10.3390/su12145741

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