| In China, ener g y co nsumption in reside ntial building has been increasing sharpl y in the past 20 years. Among the energ y consumption in residential building, residential heating and cooling a ccounts for an increas ingl y si gnificant part due to the rising demand fo r indoor thermal comfort and more indoor activities. Even so, the residential indoor air qualit y of some places in C hina, especiall y the hot su mmer and cold winter z one, is still not optimistic toda y. For example, Chan gsha i s a t ypical cit y o f h ot summer and cold winter, with the avera ge relative humi dit y(R H) of 85% and avera ge temper ature of 3℃ in winter. The climate and locat ion of C hangsha contribute to a burgeonin g r equirement for space h eatin g yet cen tral heatin g suppl y is onl y p rovided in cold winter z one of C hina. Therefore, the problem has drawn increasing attention of the public. The intergrated sensible heat storage system studied in this paper consists of air source heat pump(ASHP) units, TES water tanks and radiant floor heating(RFH) system for space heating. When the system runs in the reverse-cycle defrosting mode, the energy stored in the water tank will be the first energy source for the defrosting process through the circulation of the system to guarantees the indoor thermal environment. Up to now, seldom researches have been carried out to investigate the running performance of such an integrated sensible heat storage system for space heating, let alone the application in hot summer and cold winter area of China.The purpose of this paper is therefore to analyze experimentally the operational performance and indoor thermal comfort of the sensible heat storage ASHP system for residential heating in both normal and defrosting conditons. The experiments were carried out in a residential apartment on the 5th floor in Changsha, using the sensible heat storage ASHP system for space heating. Currently, the performance data of the system running in the heating mode have been collected, from November 15, 2014 to February 5, 2015. Controlled comparative experiments, with VRV ASHP unit for space heating, were conducted in the apartment on the 11 th floor of the same building.The results based on the experimental data and numerical calculation were concluded at the end of the paper. A shorter defrosting duration and better indoor thermal comfort were achieved during defrosting compared with conventional ASHP system. The def rosting period of the sensible heat stora ge s yste m was 6~8 min in the worst outdoor condition. And indoor air temperatur e at 1.1 m level and floor level wer e among the ran ge of 20.5~22.9 ℃ and 24.9~29.3 ℃ r espectivel y. And the value of P MV fl uctuated from-0.53 to 0.15. Ex perimenta l results and the calculated ev aluation index es depict that the sensible heat s torage s yst em is promising and suitable for residential h eating in C han gsha and can a chieve improved indoor ther mal comfort and low er ene r g y consumption compared with the VRV s ystem. The compressor suction pressure of the heat storage system is 100~160k Pa higher than that of the conventional ASHP system during defrosting process. The suction pressure can also improve the exhaust gas pressure, which greatly improves the reliability of the ASHP. |
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