Solution Found!
A furnace, shown in Fig.P5.115, can deliver heat, QH1, at
Chapter 5, Problem 115HP(choose chapter or problem)
Problem 115HP
A furnace, shown in Fig.P5.115, can deliver heat, QH1, at TH1, and it is proposed to use this to drive a heat engine with a rejection at Tatm instead of direct room heating. The heat engine drives a heat pump that delivers QH2 at Troom using the atmosphere as the cold reservoir. Find the ratioQH2/QH1 as a function of the temperatures. Is this a better set up than direct room heating from the furnace?
FIGURE P5.115
Questions & Answers
QUESTION:
Problem 115HP
A furnace, shown in Fig.P5.115, can deliver heat, QH1, at TH1, and it is proposed to use this to drive a heat engine with a rejection at Tatm instead of direct room heating. The heat engine drives a heat pump that delivers QH2 at Troom using the atmosphere as the cold reservoir. Find the ratioQH2/QH1 as a function of the temperatures. Is this a better set up than direct room heating from the furnace?
FIGURE P5.115
ANSWER:
Solution 115 HP
Step 1 of 3
For a furnace, given in figure P5.115 delivers a heat of for heat engine and
for heat pump at
and at room temperature
. so we need to find the ratio of
and
as a function of temperature and also to explain whether this is a better setup for the furnace than the direct room heating.