The traditional handling method of handling heat exchange in a room for design purposes was to suppose that all heat from the plant, radiative as well as convective, was input at a so called "air temperature". This is an evident misnomer, since air temperature as such cannot drive longwave radiation as themodel actually assumed. The "environmental temperature" concept has been introduced in the UK to get round the difficulty. This paper presents an analysis of when an approach along these lines may be logically acceptable.
Three balanced airflow ventilation devices were evaluated, an exhaust and supply fan (E&SF), air-to-air heat exchanger (ATAHE), and exhaust air heat pump (EAHP), which can be used to increase the ventilation rate in an R-2000 (tightly constructed) type house. A prototype of the EAHP, which uses a combination of heat pipe and heat pump, was built and tested. A frosting and non-frosting version of the EAHP were evaluated. The non frosting version provided the best overall performance.
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