The performance of a low temperature solar collector, which acts as an evaporator of a heat pump system, has been investigated. An experimcntal setup has been designed, fabricated and tested under the meteorological conditions of Singapore. Refrigerant 134a has been used in the experiments. Effects of various parameters have been considered. Result

This paper includes results of an investigation carried out on a desalination plant which consists of a direct expansion solar assisted heat pump (DXSAHP) coupled to a single-effect evaporator unit. The working fluid used in the heat pump is R134a. The distillate is obtained via falling film evaporation and flashing in the evaporator. Experiments h

Creativity is the ability of a person that enables him/her to think of, dream up or visualize unusual solution to a problem. It plays an important part in the development of a nation. Generally, a creative process involves five significant steps: first insight, preparation, incubation, illumination and verification. Innovation, on the other hand, i

Chemical kinetics study was carried out for batch esterification process. Reactant concentration (FFA) as function of time was plotted according to first and second order equations in order to study the catalytic activities of both toluene-4-sulfonic monohydrate acid (PTSA) and sulfuric acid. Pretreatment of Sludge Palm Oil (SPO) by esterification

Three different types of photovoltaic solar cells were installed and connected in grid-tie inverters to run a blower or pump under the meteorological conditions of Singapore. Experiments were performed over a period of time, where all three types of cel1s, each type having a rated power of 360W, were exposed to same enviromental conditions. For a d

A solar assisted heat pump drying system has been designed, fabricated and tested. The performance of the system has been investigated under the meteorological conditions of Singapore. This paper presents an economic optimization of a solar assisted heat pump drying system. Economic viability of solar energy heating systems is usually made by compa

This paper includes the results of a study carried out to determine the drying characteristics of three agricultural fruit products. The products used in this analysis were apples, guavas and papayas. The drying characteristics of the three products were investigated under different operating conditions by varying now velocities and the thickness o

In this paper. a mathematical model has been developed to predict temperature and moisture distribution within a column dryer taking into account the influence of the change of air moisture on the grain moisture through the sorption isotherm. In the development of the energy equation, the influence of moisture contents on the properties of the mate

In this study, the performance of a three-in-one solar system is investigated. The three applications of the system are: air-conditioning, water heating and drying, which can be served simultaneously or independently. The presence of evaporator-collector enables the system to operate round the clock. Parallel arrangement of the evaporator and evapo

Energy and environment, both arc essential for our survival on the planet earth to ensure a deeem standard of living and good health. However, there is a price [or the comfort that we strive hard to achievc. It took forty years to realize that CFC (Chlorofluorocarbons) causes Ozone depletion. Similarly. greenhouse gases and acid rain are realities