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In recent years, in order to improve the air quality and reduce the primary energy consumption, many cities releases the policy of classifying the prohibition coal-burning area and limitation coal-burning area, in which high polluting coal fired boiler couldn’t be built or expanded. Besides, except the ones used to support urban central heating and utility boiler, the existing coal fired boiler in the prohibition area should be removed or reconstructed to utilize natural gas, liquefied petroleum gas or electricity and so on. However, for the public bathrooms in city as well as in universities, the traditional heating mode still takes advantage of coal fired boiler. As a result, it’s a major concern on how to rebuild the public bathroom to maintain its lower operating cost and easy control after the new policy.With solar energy and heat pump technology, we can use renewable energy to reduce coal. In this paper proposes a heating plan of utilizing renewable energy sources, including solar energy, waste heat of sewage and thermal storage performance of soil. According to the bathroom’s operating conditions, it takes different mode of operations: bathroom Regenerative mode, bathroom heating operation mode which include direct solar heating mode, the solar heat pump heating mode, ground source heat pump heating mode, sewage source heat pump heating mode.Studying on the example of a bathroom in Wuhan, this paper constructs mathematical model of the system components. Based on the simulation platform of Fluent, it gets the system running status of a year and analyzes solar thermal storage performance of heat storage season, energy consumption of heating season energy consumption and the cast.At last, it proposes the way if using sewage, the way of hot water using,and then gets some of conclusions listed here:(1) Through the bathroom regenerative mode, the solar energy stored in the ground, to improve the underground soil temperature, thus improving the efficiency of plant operation;(2)The system can provide adequate heat for the bathroom to ensure smooth and efficient operation of the system. Even in cold winter, the air temperature is below 0℃, no solar radiation, it can still run well; (3) Compared with conventional energy sources, this system operating costs low. Using renewable energy, there is no exhaust gas , waste water, waste and other pollution produced, so this system has a good environmental benefits;(4) Sewage heat recovery through the use of multi-level approach, additional warm-water tank bathroom ways to improve energy efficiency and reduce energy consumption.
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