INVESTIGATION ON PARAMETER INFLUENCING THE EFFICIENCY OF PASSIVE COOLING OF A TWIN BUILDING

Passive cooling techniques are the approaches with can replace the conventional cooling method to provide space cooling for a building with low or no energy consumption. Conventional cooling method requires high energy consumption and at the same time releases tremendous amount of greenhouse gases that can cause environmental problems. Heat dissipation and modulation technique, such as wind driven ventilation, buoyancy driven ventilation, evaporative cooling, ground cooling and evaporative cooling, are example of passive cooling techniques. Nevertheless, compare to passive cooling using insulation, these types of passive cooling are relatively more dependent on the environment condition, such as wind speed, climate or other characteristics like construction materials, available equipment and others. Aerogel is an advance artificial material, which has high potential as insulator as it can inhibit heat conduction and convention. This research will study about the potential passive cooling technique using aerogel insulation in tropical region under Malaysian conditions by studying few suitable parameters. Details or suitable methodology has been defined to have a good outcome of the research. The effectiveness of the aerogel to reduce the indoor temperature of the student had been study through the EnergyPlusTM simulation. From the temperature profile generated, aerogel insulation is able to reduced up to 4.376℃. Besides, study on the effect of ventilation rate of a building in providing the passive cooling also been done. From the result, it shown that the temperature of the building decrease as the ventilation rate increase. Nevertheless, the aerogel insulation is not recommended to be too thick as most of the insulated heat load is been done on the first later of the aerogel insulation. Increasing in insulation can further decrease the temperature but it does not show a significance different. Challenges of the application of the aerogel insulation is mainly on the cost of the aerogel at with the calculated simple payback period up to 14 years. The simulation result is validated by comparing the simulation result with the actual experimental result which shows the maximum and minimum deviation of 8.75% and 0.49% respectively

A preliminary investigation of China Ginger and Kuching Local Ginger species : Oil extracts and synthesis towards potential greener insect repellent

Ginger essential oil (Zingiber officinale) is the volatile oil extracted from ginger rhizome. Compared to chemical synthetic repellent, green insect (in particular mosquito) repellent would be favoured by the public as it is environmentally friendly and does not cause harm to the human’s health. The focus of this study is on the comparison study between China Ginger and Kuching Local Ginger essential oil aim towards utilization as the greener mosquito repellent. In this study, the ginger essential oils are extracted greener method i.e. via hydro distillation process for 7 h. The percentage oil yield for China and Kuching Local Ginger are 0.158 wt% and 0.264 wt%, respectively. The extracted ginger essential oils are further subject to Fourier Transform Infrared Spec�troscopy (FTIR) and Gas Chromatography- Mass spectrometry (GC-MS) analysis. Based on the FTIR spectrum graph generated, both types of ginger essential oils essentially having the similar function groups including phenolic compounds, alcohol primer, alkena methyl group, aromatic compound, carbonyl compound, carboxylic acid, hydroxyl group. From the GC-MS results it revealed that the most abundant chemical constituents presented in both China Gniger and Kuching Local Ginger essential are: α-Zingiberene (7.88% and 7.03%), α-Curcumene (6.04% and 6.49%), α-Citral or Genarial (3.81% and 7.86%), β-Bisabolene (3.06% and 4.62%), β-esqui�phellandrene (5.83% and 5.95%), β-Sesquisabinene (0.07% and 0.51%), β-Selinenol (3.97% and 2.26%), Zin�giberenol (5.16% and 1.64%), [6]-Shogaol (0.33% and 0.23%), trans-Sesquisabinene hydrate (1.72% and 2.87%), trans-Geranylgeraniol (3.51% and 2.81%), Camphene (1.17% and 0.56%), Eucalyptol (2.68% and 1.81%), Citronellol (1.76% and 1.55%), Neral (2.82% and 6.03%), and Geraniol (1.62% and 2.29%) respectively. Kuching Local Ginger essential oil is found marginally superior insect repellent characteristics due to its higher monoterpene compounds in the essential oil

A preliminary investigation of China Ginger and Kuching Local Ginger species: Oil extracts and synthesis towards potential greener insect repellent

Ginger essential oil (Zingiber officinale) is the volatile oil extracted from ginger rhizome. Compared to chemical synthetic repellent, green insect (in particular mosquito) repellent would be favoured by the public as it is environmentally friendly and does not cause harm to the human’s health. The focus of this study is on the comparison study between China Ginger and Kuching Local Ginger essential oil aim towards utilization as the greener mosquito repellent. In this study, the ginger essential oils are extracted greener method i.e. via hydro distillation process for 7 h. The percentage oil yield for China and Kuching Local Ginger are 0.158 wt% and 0.264 wt%, respectively. The extracted ginger essential oils are further subject to Fourier Transform Infrared Spectroscopy (FTIR) and Gas Chromatography- Mass spectrometry (GC-MS) analysis. Based on the FTIR spectrum graph generated, both types of ginger essential oils essentially having the similar function groups including phenolic compounds, alcohol primer, alkena methyl group, aromatic compound, carbonyl compound, carboxylic acid, hydroxyl group. From the GC-MS results it revealed that the most abundant chemical constituents presented in both China Gniger and Kuching Local Ginger essential are: α-Zingiberene (7.88% and 7.03%), α-Curcumene (6.04% and 6.49%), α-Citral or Genarial (3.81% and 7.86%), β-Bisabolene (3.06% and 4.62%), β-Sesquiphellandrene (5.83% and 5.95%), β-Sesquisabinene (0.07% and 0.51%), β-Selinenol (3.97% and 2.26%), Zingiberenol (5.16% and 1.64%), [6]-Shogaol (0.33% and 0.23%), trans-Sesquisabinene hydrate (1.72% and 2.87%), trans-Geranylgeraniol (3.51% and 2.81%), Camphene (1.17% and 0.56%), Eucalyptol (2.68% and 1.81%), Citronellol (1.76% and 1.55%), Neral (2.82% and 6.03%), and Geraniol (1.62% and 2.29%) respectively. Kuching Local Ginger essential oil is found marginally superior insect repellent characteristics due to its higher monoterpene compounds in the essential oil