Abstract
The main problem related to thermal condition in Surabaya as a second-largest city in Indonesia is humid and hot. It is a typical condition of tropical climate. Ventilation in the hot day will bring warm and humid outdoor air into a room. It will increase the temperature of air in the room. One of some efforts to reduce the outdoor air temperature is using an earth to air heat exchanger (EAHE) to transfer heat from the air to the earth or ground. This paper will discuss about research done to study the effect of EAHE to a room temperature. The study used two model rooms which are similar and a model EAHE. One room called condition room will receive air flowing from the EAHE pipe and the other room is called the referent room. From the research, it is found that the air in condition room with EAHE is cooler in the daytime compared to the referent room. The temperature of the condition room with EAHE is more stable.
Highlights
Surabaya is the second-largest city in Indonesia which is in a humid and hot tropical area
It is found that the air in condition room with earth to air heat exchanger (EAHE) is cooler in the daytime compared to the referent room
Data given in the table are the average of three-day measurements of air temperature in referent room, condition room, outlet pipe, inlet pipe, temperature of outdoor air, and temperature of the ground where EAHE is buried
Summary
Surabaya is the second-largest city in Indonesia which is in a humid and hot tropical area. The coolest month is February which climate conditions are 26.6 C and 84% for air temperature and humidity, respectively. The warmest happens on October which data are 28.4 C and 81% for air temperature and humidity, respectively. Those climate conditions are plotted on Olgyay–bioclimatic chart. The conditions become more severe in Surabaya urban areas. More dense areas are covered with hard surface and lack of open space to generate air movement and cause the phenomenon of urban heat island. Jatayu and Cahyono [3] found that urban heat island condition in East Surabaya caused the air temperature in there rise 11.4% in the period 2011-2016
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