Valoración y utilidad de los ínidces PMV, PET y UTCI en la evaluación del confort térmico en parques urbanos: un caso de estudio. Victor José Del Campo Díaz.

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Valuation and use of PMV, PET and
UTCI in the evaluation of thermal
comfort in urban parks: a case study.
Valoración y utilidad de los índices PMV, PET y
UTCI en la evaluación del confort térmico en
parques urbanos: un caso de estudio.
del Campo-Díaz Víctor José1, Llanos-Medina Douglas Miguel1 and del Campo-Alea
Julen Laurentzi2.
1 Department of Thermal Machines and Engines, Universidad del País Vasco,
UPV/EHU, Bilbao, 48013, Spain
2Department of Vegetal Biology and Ecology, Universidad del País Vasco, UPV/EHU,
Leioa, 48940, Spain
Presenter’s telephone and e-mail address: 946 01 3996 - victor.delcampo@ehu.eus
INDEXES OF THERMAL COMFORT IN OPEN URBAN SPACES: PMV, PET AND UTCI

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THE PROGRAM RAYMAN
The computer program RayMan calculates the influence of the short-wave and long-
wave solar radiation on the thermal comfort. This software is applied in urban areas
of structures simple or complex. Also, it applies to the planning of both local and
regional levels.
The software requires the following input parameters: dry temperature of the air,
relative humidity of the air, and airspeed; which enables us to calculate the MRT.
This temperature is the input variable that is needed in the calculation of the UTCI
and PET indexes, among others.
THE STUDIED AREA.
The municipality of Barakaldo (province of Spain) has an area of 25.8 Km2. It is
located on the Left Bank of the Nervión River Spain .

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METHODOLOGY
To determine the thermal comfort levels in Los Hermanos Park with the RayMan
model was used the PMV with KMM index, in addition to PET and UTCI. The days
chosen for the realization of the simulations are a typical summer day (June 21th,
2017) and a typical winter day (December 21th, 2017).
Scenarios:
Scenario 1: Measurement point in the center of the park, exposed to the sun and conserving the shadow projected by buildings
and mature deciduous trees in the park.
Scenario 2: Measurement located in the center of the park, exposed to the sun and conserving the shadow projected by
existing buildings in the park, but without trees.
Scenario 3: Measurement point located in the center of the park, exposed to the sun and conserving the shadow projections
generated by existing buildings in the park, but changing the location of the trees from the north to the south of the park.
Scenario 4: Proposal scenario, like the first scenario and planting new mature deciduous trees planted at the north of the park.
RESULTS:
RESULTS FOR THE TYPICAL WINTER DAY (2017.12.21)
PMV INDEX WITH KMM

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RESULTS:
RESULTS FOR THE TYPICAL WINTER DAY (2017.12.21)
PET INDEX
RESULTS:
RESULTS FOR THE TYPICAL WINTER DAY (2017.12.21)
UTCI

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RESULTS:
RESULTS FOR THE TYPICAL SUMMER DAY (2017.06.21)
PMV INDEX WITH KMM
RESULTS:
RESULTS FOR THE TYPICAL SUMMER DAY (2017.06.21)
PET INDEX

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RESULTS:
RESULTS FOR THE TYPICAL SUMMER DAY (2017.06.21)
UTCI
INDEX COMPARISON:
RESULTS FOR THE TYPICAL WINTER DAY
(2017.12.21)

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INDEX COMPARISON:
RESULTS FOR THE TYPICAL SUMMER DAY
(2017.06.21)
CONCLUSIONS:
The simulations carried out in our study, for summer and winter, reveals that the
thermal comfort parameters can be significantly affected by the configuration
of urban obstacles, specially, the arboreal vegetation.
The effectiveness of the shading of the urban space is proven as an effective
strategy to improve thermal comfort conditions in open spaces, as well as to
contribute to the reduction of energy consumption, both for cooling (in summer) and
for heating (in winter).

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CONCLUSIONS:
The Rayman program at the Los Hermanos Park show that it has the potential to
become a useful tool to help urban planners and designers understand the potential
of open spaces to improve microclimates.
Based on the results obtained in the present investigation, it is recommended to
carry out other application analyzes of the RayMan program for estimating thermal
comfort values in other urban spaces, in order to know the correlation between
urban morphology and thermal comfort.