Heating Ventilating and Air Conditioning: Analysis and Design
6th Edition
ISBN: 9780471470151
Author: Faye C. McQuiston, Jeffrey D. Spitler, Jerald D. Parker
Publisher: Wiley, John & Sons, Incorporated
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Chapter 1, Problem 1.25P
A heat pump uses a 100,000-gallon swimming pooi as a heat source in the winter. When the heat pump is running at full capacity it is drawing 3.5 tons of energy from the pool. Assuming no heat gain to the pool from sunlight or ground conduction, how long would it take the heat pump, running at full capacity, to draw the pooi temperature down 20F?
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Students have asked these similar questions
1. A geothermal heat pump with a COP of 1.3 provides 48000 BTU/hr of heat to a
building. Assuming an electrical power rate of $0.20/kWh. answer the following
questions for this system:
a. What would be the monthly cost to provide heat at a rate of 48000 BTU/hr
if the heat was delivered by a simple electrical resistance heater?
b. How much heat is drawn from the ground by the heat pump in that month,
in kWh?
c. What is the savings per month enjoyed by operating this heat pump for a
month vs. a simple electrical resistance heater?
A homeowner is trying to decide whether to heat with a furnace rated at 95%
efficiency or by an electrically powered heat pump. She lives in a town where
electricity is produced by a coal-fired power plant that claims to operate with 1st law
efficiency that is 55% of the Carnot limit. The heat pump's CoP is advertised to
be 40% of the Carnot limit. For what range of outside temperatures To would the
2nd law efficiency of the furnace be greater than that of the heat pump? Assume T+
= 400°C, T- = T= 40°C.
%3D
A garage is being retrofitted with a heat pump of COP=3. The garage heat losses are 10,000 BTU/h. How much would it cost to heat for one month (30 days) if electricity costs $0.14/kWh? How much will it cost to heat with an electrical baseboard (assume 100% efficiency)?
Ans: heat pump - around $100 (exactly $98.5); electrical baseboard - $295.40
Chapter 1 Solutions
Heating Ventilating and Air Conditioning: Analysis and Design
Ch. 1 - Convert the following quantities from English to...Ch. 1 - Convert the following quantities from SI to...Ch. 1 - A pump develops a total head of 50 ft of water...Ch. 1 - A fan is observed to operate with a pressure...Ch. 1 - The electric utility rate for a facility during...Ch. 1 - For the business whose monthly electrical energy...Ch. 1 - Detmine the interest rate at which the project in...Ch. 1 - How much could a company afford to spend on an...Ch. 1 - Make the following volume and mass flow rate...Ch. 1 - A room with dimensions of 31020m is estimated to...
Ch. 1 - Compute the heat transferred from water as it...Ch. 1 - Air enters a heat exchanger at a rate of 5000...Ch. 1 - Water flowing at a rate of 1.5 kg/s through a heat...Ch. 1 - Air at a mean temperature of 50 F flows over a...Ch. 1 - Repeat Problem 1-10 for air at 10 C, a tube with...Ch. 1 - Air at 1 atm and 76 F is flowing at the rate of...Ch. 1 - Air flowing at the rate of 1000 cfm and with a...Ch. 1 - A chiller is providing 5 tons of cooling to an air...Ch. 1 - Air is delivered to a room at 58 F and the same...Ch. 1 - A chiller is to pro;ide 12 tons of cooling to a...Ch. 1 - Air is being rnished to a 30-ft by 40-ft by 12-ft...Ch. 1 - If cold outside air at 20 F is leaking into a...Ch. 1 - A Btu-meter is a device that measures water flow...Ch. 1 - A heat pump uses a 100,000-gallon swimming pool as...Ch. 1 - A heat pump uses a 100,000-gallon swimming pooi as...
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