Data from a heat exchanger laboratory

Description

These data were collected by engineering students at Calvin College. The apparatus consists of concentric pipes insulated from the environment so that as nearly as can be managed the only heat exchange is between the hot and cold water.

Usage

data(HeatX)

Format

A data frame with 6 observations on the following variables.

• trial trial number

• T.cold.in temperature (C) of the cold water as it enters the apparatus

• T.cold.out temperature (C) of the cold water as it leaves the apparatus

• m.cold flow rate (L/min) of the cold water

• T.hot.in temperature (C) of the hot water as it enters the apparatus

• T.hot.out temperature (C) of the hot water as it leaves the apparatus

• m.hot flow rate (L/min) of the hot water

Examples

# We can test for heat exchange with the environment by check to see if the 
# heat gained by the cold water matches the heat lost by the hot water.
C_p <- 4.182 / 60  # / 60 because measureing m in L/min
HeatX2 <- transform(HeatX, 
                Q.cold = m.cold * C_p * (T.cold.out - T.cold.in),
                Q.hot= m.hot * C_p * (T.hot.out- T.hot.in)
)
HeatX2 <- transform(HeatX2, Q.env = Q.cold + Q.hot)
if (require(mosaic)) {
  stripplot( ~ Q.env, data=HeatX2, alpha=.6, cex=2, jitter.data=TRUE, factor=4)
  t.test( ~Q.env, data = HeatX2 )
}