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Improved heat recovery & air conditioning heat pump - Application in a northern hospital

Minea V, 2003
cooling | heat pump | heat recovery | heating
Bibliographic info: The 4th international conference on Cold Climat HVAC, Trondheim, Norway, June 16-18, 2003, Paper 46, pp 1-9, 5 Fig.,3 Tab., 5 Ref
Languages: English

This paper presents the configuration and some experimental performance data for an improved, custom designed heat recovery & air conditioning retrofitting system, developed for a hospital located in a Canadian cold-climate environment. The two-stage heat recovery system includes a conventional glycol heat exchanger and a prototype of a reversible air-to-air heat pump between the exhaust and the fresh air streams. The original feature of the heat pump consists mainly of two independent, parallel, vertical circuits, each including two identical, 9 and 16-ton in-tandem compressors, bi-directional liquid receivers, dedicated sub-coolers, supplementary condenser for extreme conditions, and a control strategy of compressors allowing for modulating the heating or cooling capacity, and to perform defrosting without inversion of the cycle. The system was monitored over a 12-month period, and the results focused on the thermodynamic parameters of the supplied and exhausted air, seasonal utilisation and performance factors, annual energy balances and savings, and pay-back period.

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