The  constant,  a is  0。972  gH2O/m3 °C。  The  COP  for  an  entire

HVAC system usually is around 3–4。5   [30]。

From Table 2, when the relative humidity of supply air of HVAC keeps constant, the relative humidity at the measurement point

688 X。  Wu  et  al。 / International  Journal  of  Heat  and  Mass  Transfer  87  (2015)      685–692

Table 1

The computational conditions of supermarket scale  model。

Simulated tests

Location Parameter Unit Test 1 Test 2 Test 3 Test 4 Test 5 Test 6 Test 7

Ambient Tamb °C 25 25 25 25 25 25 25

uamb % 60 60 60 60 60 60 60

Supermarket air-conditioning Tvent °C 16 17 18 19 18 18 18

Vvent m/s 2。0 2。0 2。0 2。0 2。5 3。0 3。5

uvent % 30 30 30 30 30 30 30

Open vertical refrigerated display cabinet Ws m 0。1

TS °C 0。5

Vs m/s 1。4

us % 90

Wr m 0。14

Vr m/s 1。3333