(b) HVAC

Fig。 11。  Electricity consumption of HVAC and VORDC for different    Vsup。

be close to the initial supply air temperature of diffuser, so the influence on the ambient conditions and the RAG is gradually decreasing。

Fig。 10。 Velocity vectors for supermarket at velocity 2。0 m/s, temperature 16 °C, relative humidity 30% of supermarket HVAC supply air and x/L = 0。5。

Table 3文献综述

Temperature and relative humidity variations for different   Vsup。

Cases Supermarket-scale Cabinet-scale

Parameters  at diffusers Climate conditions Parameters at RAG

Tsup Vsup RHsup Tcli RHcli TRAG RHRAG

(°C) (m/s) (%) (°C) (%) (°C) (%)

1 16 2。0 30 21。97 61。97 9。16 87。97

5 16 2。5 30 20。29 60。71 8。53 84。32

6 16 3。0 30 19。75 57。93 8。28 78。39

7 16 3。5 30 19。75 58。06 8。03 78。50

X。  Wu  et al。 / International Journal of  Heat and  Mass Transfer 87 (2015)    685–692 691

model。 Then, the influence on the infiltration rate of air curtain and energy consumption is evaluated in cabinet-scale model。 Finally, the variation of products temperature on the second shelf is investigated。

Computational results show that the HVAC system directly affect the performance of VORDC。 When the supply air tempera- ture of HVAC system decreases from 19 °C to 16 °C, the electricity energy inputted in VORDC system decreases by 6。36%, and the highest products temperature is reduced by 0。18 °C。 When the DSAV of HVAC system increases from 2。0 m/s to 3。5 m/s, the energy inputted in VORDC system decreases by 23。4%, the energy inputted in HVAC system by 75%, and the highest product temperature by

0。4 °C。

The increase rate of energy consumption of HVAC is much greater than the decrease rate of the VORDC energy loss,  because

Fig。 12。  Comparison of NIR for different Vsup。

there is only one VORDC is considered in this supermarket scale model。 With the improvement of the computing capacity of com- puter, more VORDCs or other sale devices could be considered in the CFD model。来:自[优E尔L论W文W网www.youerw.com +QQ752018766-