What is a Heat Pump?
        Heat pump is a hot-water generator. It is an important system in the use for the various types of organizations, such as, hospitals, hotels, resorts, and some industrial factories, etc. Traditional hot-water generator systems that several organizations have used have various types, such as, the boiler by using various types of fuels, or the electrical coiled heater. With these all transitional hot-water generator systems, they will be produce hot water with high power consumption and high cost. In order to reduce the cost in the part that requires high energy to make hot water for the use in the workplaces. The selection of hot-water generator system with high performance and energy saving is the way to reduce costs and conserve the environmental community where the organizations located, to be free from pollution caused from the burning. Heat pump is then the alternative way by proposing the new heating device, instead of old transitional heating system. 
        Heat pump system is the heat-water generator system with the characteristic like air conditioner. Generally, the main instruments of heat pump comprise 4 types, as follows:
1.   Compressor
2.   Condenser
3.   Fan or Blower Motor
4.   Evaporator

        How heat pump can save energy, compared with the other methods of hot-water generator systems, is shown as follows: 
1.   Hot-water boiler system with electrical coil
2.   Hot-water boiler system with fuel oil
3.   Hot-water boiler system with diesel oil
4.   Hot-water boiler system with LPG gas.
5.   Hot-water boiler system with other fuels
Principle of heat pump
        The work concept of the heat pump is to drain heat from the refrigerant to the water at condenser side. The refrigerant will be absorbed and compressed with high pressure to rise the temperature by the compressor. While the cold substance (refrigerant) is still high-pressure and and high-temperature gas. When refrigerant reach to the condenser which is, in this case, the copper pipe in the water. It will emit heat to water causing temperature to be higher. Refrigerant will have lower temperature down to the fluid point but still have the very high pressure. When liquid refrigerant flow through the pressure-reducing valves or pipes, it will transform to be low-temperature and low-pressure vapor. When reaching the evaporator and receiving heat from the air, it will become gas again and flow to the compressor. Work concept of the heat pump will circulate in cycle in this system until receiving the desired hot water.

Benefits of using heat pump
1.   Save money on water heating process down to 70%, because use energy only 30% in producing hot water. Due to not sending heat energy to water directly but using electrical compressor to compress chemical to higher pressure, resulting in 3-time of heat energy. Then, it will make the heat to the water through heat coil.
2.   Receive cold air from the free cold coil. Because when the chemical exchanges heat to water already, the chemical will changes to be liquid. When liquid chemical flow through the
expansion valve, liquid chemical will evaporate, making the cold coil absorbs heat becoming cold air. Air-cooling fan has no pollutions, emissions, and soot. Because there is no fuel combustion and help the nation conserve energy.
3.   If setting the cylinder capacity appropriately, the system will be able to work properly by setting time to use electricity at the time that electricity cost is cheap (avoiding peak demand).






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