Karakteristik Dan Visualisasi Aliran Dua Fasa Pada Pipa Spiral

The flow of air-water mixtures has been investigated in a horizontal spiral pipe. The effect of flow in the spiral pipe will be used to identify the location bubble transition. The purpose of present study is to understand characteristics of the air - water mixture flow in a horizontal spiral pipe. Measurements of pressure losses and bubble distribution of cross section spiral pipe were carried out for air-water by means of manometer and digital video, respectively. As a result, it is shown that the friction of air-water mixture is greater than that of water, and a location of bubble flow can be identified

Analisis Sistem Heat Pump Kompresi Uap untuk Pengeringan Gabah

As a drying system, heat pump drying with appropriate configuration is potential to safe energy. The objective of this research was to develop vapor compression heat pump system for rough rice drying and to obtain low energy consumption from several system configurations. Therefore, the model of vapor compression heat pump system was designed in which its configuration was modifiable. The result showed that the ratio of specific moisture extraction rate which calculated mechanic and thermal consumption (SMERTot) upon resistive heating dryer for those several configurations was 159 – 329%. The open cycle heat pump drying method with intermittent operation produced the highest specific moisture extraction rate which only calculated thermal energy (SMERT) and SMERTot at 7.06 and 5.06 kg/kWh, respectively. Intermittent operation did not much influence drying rate but significantly reduced energy consumption. Ambient air inlet which placed before evaporator and condenser on a closed cycle could produce different SMERTot i.e. 4.01 dan 3.07 kg/kWh respectively. The utilization of ambient air through forced convection in heat exchanger could increase SMERTot, while the utilization of air flow the dryer from outlet could reduce SMERTot