**Editor's Note:** To help readers better understand the latest energy-saving technologies and innovations, the City Energy-Saving Monitoring Technology Service Center has selected a range of products to feature in our "Live Show of Energy-Saving Products." Each week, we'll introduce different types of energy-efficient solutions, explain their scientific principles, and provide details about upcoming exhibitors and product listings.
In recent years, heat pump water heaters have gained widespread popularity due to their ability to recover low-temperature waste heat and offer significant energy savings. These systems are now being adopted by people of all ages who are looking for more sustainable and cost-effective heating options.
As a modern heating solution, a heat pump water heater produces hot water with significantly lower energy consumption compared to traditional electric or gas heaters. In fact, it uses only about 1/4 the energy of an electric water heater and 1/3 that of a gas system. When used on a large scale, it can greatly reduce the overall demand for heating energy in communities.
For example, consider a typical urban household that uses 200 liters of 60°C hot water per day. If using an electric water heater, which heats water from 40°C to 60°C, the daily power consumption is approximately 11.6 kWh, costing around ¥5.3. Annually, this would amount to roughly ¥1,925. On the other hand, a heat pump water heater would only consume about 2.6 kWh per day, costing around ¥1.53, leading to an annual cost of approximately ¥550. This means homeowners could save at least ¥1,375 per year by switching to a heat pump system.
The heat pump system consists of four main components: the compressor, condenser, expansion valve, and evaporator. Similar to a refrigerator, the heat pump uses the compressor to circulate the refrigerant through the system, allowing it to continuously evaporate and condense. The refrigerant absorbs heat from the surrounding environment, which is then compressed into a high-temperature, high-pressure gas. This heat is transferred to the water via a heat exchanger, and after passing through the expansion valve, the refrigerant returns to its low-temperature, low-pressure liquid state. This continuous cycle allows the water in the tank to be heated efficiently, and the hot water is then distributed through a circulation system for either heating or direct use.
By adopting such advanced technology, households not only enjoy lower utility bills but also contribute to a greener, more sustainable future.
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