Schools in Beijing to warm water heating systems engineering case description –
It is understood that a school in Beijing ground source heat pump works in winter running field test showed "ground source heat pump + solar energy + water to warm," is an ideal heating system worth using.
Project Overview
The project covers an area of 71,322 square meters of total planning, including planning of construction land area of 57,332 square meters, total building area of 35,800 square meters, from the primary and secondary school buildings, laboratory building, a small hall, apartment building, canteen, gymnasium and buildings or building component.
The project used ground source heat pump system as the end of the energy release of all building systems and heat source, except sports, teachers and canteen apartments, each building heating only heat source in winter, no summer cold source system. Design of ground source heat pump system provides 7 ~ 12 in summer chilled water in winter to provide 45 ~ 40 air conditioning, heating and hot water.
The project ground source heat pump system design cooling load 5892KW, the project ground source heat pump system thermal design load 2499.84KW.
The engineering school buildings, student dormitories, hall and gym with water to warm, teachers quarters, canteen with fan coil units, fan coil and the whole stadium heat exchange with air conditioning units.
The project to pipe system endothermic heat load in winter about 1875KW, the summer load up excitedly about 707KW.
Winter commissioning of the project Analysis of field measurement and
1, debugging and running field test
The project on October 25, 2007 start debugging and running, ground stability and circulating water temperature is 13.6 , 11 1 debugging is completed, and began to heat buildings.
One month after commissioning, the system run status as follows:
December 5, 2007 to 15, two hosts to run four hours later, the average ground heat exchanger inlet temperature of about 3 , the average water temperature is around 7 , appears to protect themselves down the low temperature unit , then the end of the average water temperature around 32 , the average water temperature is 28 , the room temperature can meet the design requirements.
December 16, 2007 to 20, two hosts to run 3 hours, the underground heat exchanger average water temperature of about 3 , the average water temperature is about 6.5 , there to protect their own cold shutdown units , then the end of the average water temperature of 30 , the average water temperature around 26 , then send the wind fan coil temperature of less than design requirements, low water temperature radiant floor heating in some rooms can not meet the design requirements.
December 31, 2007 found that two hosts simply can not debug normally open, and finally by increasing the ground water flow heat exchanger, two heat pumps host can run three hours or so, the average water underground heat exchanger temperature of about 3 , the average water temperature of about 6 , for 5 days, units of low-temperature shutdown protection of their own, then the end of the average water temperature around 27 , the average water temperature around 23 , the room temperature were not meet design requirements.
January 5, 2008, by opening a heat pump, and adjust off the room and the floor is not used, the supply of sub-periods and functional apartments canteen (noon and evening) and classroom building, then the average ground heat exchanger water temperature is about 3.5 , the average water temperature is about 6.7 , the end of the average water temperature around 32 , the average water temperature is 28 , room temperature, the improvement is a good choice for heating.
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