Population and economic growth affect the total energy demand and Air Conditioner (AC) electrical systems and economic growth. Energy conservation is needed to reduce the total energy used. Heat pipe heat exchangers (HPHE) are implemented to recover waste energy in air conditioning systems. This study has investigated the performance relationship between effectiveness and the Number of Transfer Units (NTU) in the system. One line of straight axis heat pipe is installed at the inlet and outlet. The configuration was shaky. Changes in temperature and humidity are measured to obtain energy conversion according to changes in air intake speed and temperature variations that enter the ducting. The application of HPHE in the air conditioning system can reduce energy consumption. The results showed that the relationship between effectiveness and NTU was linear. The effectiveness varies from 0.08 to 0.202, and the relationship is expressed as = 1.14NTU + 0.0041. Whereas for low temperature applications the effectiveness varies from 0.022 -0.14, the relationship is expressed as = 1 765 NTU + 2.9. These test results can be concluded that HPHE is economical for heat recovery systems in air conditioning systems.
Indonesia has been blessed with excellent solar heat distribution, which can be used as renewable energy to heat water. Various technologies have been developed to utilize these inexhaustible thermodynamic resources, in the form of photons arrays, converted into concentrated heat for daily use, i.e., solar water heater. This renewable-based water heating system can provide significant energy efficiency, benefit the environment, and reduce energy use costs. This experimental study attempts to harvest the energy from the sun using a cylindrical through collector (CTC) type solar concentrator. The CTC was made of the solar reflective film (SRF) affixed to concentrator collector surfaces which was then mounted on an adjustable angle frame of the concentrator collector support. The heat generated from the concentrator was stored in water, and phase change material is embedded in the system to retain the heat longer. The research was carried out in Langsa City, Aceh, Indonesia. The results showed that water heaters using CTC systems could produce 16 L of hot water retained at 40–60 oC for four hours. With the addition of beeswax, the water temperature of the same capacity can be maintained at 40–60 °C for around 5 h. This technology demonstrated an excellent result that produces as much as 60 L of water per day, increasing solar thermal energy efficiency. This technology presented a great potential for replication or even for further development on an industrial scale.
Tanaman hias biasa digunakan untuk mendekorasi ruangan atau memperindah pekarangan rumah. Dalam era teknologi saat ini dimana setiap orang memiliki kesibukan yang tinggi, maka terkadang membuat orang tidak sempat bahkan lupa memperhatikan tanaman hias di rumahnya. Oleh karena itu, tujuan dibentuknya sistem monitoring tanaman hias ini adalah untuk mengetahui kondisi tanaman dengan menampilkan gambar bahagia dan sedih pada layer LCD. System ini menggunakan mikrokontroler berupa arduino nano sebagai alat pengendali utama dan terhubung dengan sensor lainnya seperti sensor LDR, soil moisture, dan DHT11. Hasil dari penelitian ini menunjukkan bahwa tanaman hias tersebut berada dalam kondisi yang baik jika menampilkan gambar bahagia, yaitu ketika hasil pembacaan pencahayaan, kelembapan tanah, dan suhu yang diperoleh sesuai dengan nilai yang telah ditetapkan pada program. Begitu pun sebaliknya, jika sistem menampilkan gambar sedih, maka hal tersebut menunjukkan bahwa keadaan tanaman hias tersebut tidak baik karena sedikitnya pencahayaan, kurangnya kelembapan tanah, dan rendahnya suhu yang diterima oleh tanaman hias. Nilai yang telah ditetapkan pada sensor kelembapan tanah dan pencahayaan berada pada rentang 50% sampai 95%, sedangkan nilai yang ditetapkan pada sensor suhu berada di rentang 15°C sampai 35°C.
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