Evaluation of ventilation by stack effect using condensing units of refrigeration

Every city or town has a market to supply fresh food to its residents. A market has the function of displaying fresh food, auctioning it, and supplying it to consumers. A market must fulfill this role throughout the year even in cold, snowy areas, and this calls for a large, covered space. At the same time, vehicles of various sizes drive in and out of the market premises to transport food into and out of the market. These vehicles emit exhaust gas, however, and the introduction of a large amount of fresh air into the market space is indispensable for maintaining good air quality. For this reason, the amount of required ventilation becomes massive for large-scale market facilities and saving energy becomes an important issue in facility management. This report studies a temperature-differential ventilation system that uses the exhaust heat from the outdoor (condensing) units of a refrigerator to produce a stack effect. The system is targeted for use in a large-scale market scheduled for construction in Sapporo City in Hokkaido , Japan. Objectives of the study are as follows :
. Survey actual conditions in existing markets and clarify the relationship between vehicle density and concentration of polluting gases.
. Perform a model experiment on temperature-differential ventilation that installs the outdoor units of a refrigerator in an air-well space, and investigate the validity here of airflow network model analysis
. Clarify the relationship between amount of required ventilation and various conditions such as the shape of the air-well space, the position of outdoor units, the amount of exhaust heat from outdoor units, etc