Energy saving by means of effective usage of heat pumps

A huge amount of fossil fuel is consumed by human activities. Air conditioning systems also require large amounts of energy resources, mainly fossil fuels in their running time. But there are many kinds of energy resources besides fossil fuels, such as wind power, solar energy, various wasted heat and so on. If we can use such so-called unused energy, we can achieve great energy savings. In this paper, the authors show the effect of the effective usage of heat pumps in order to utilize the unused energies. In such a study, it is essential that total amount of energy usage in air-conditioning systems and total amount of heat usage in buildings are measured. In the case of district heating and cooling (DHC) plants, we can easily obtain such data. Therefore, DHC plants are analyzed here.