Chapter 4 Hot Water Heating Systems Flashcards
- An advantage of the forced circulation hot water heating system is:
A. Noisier operation
B. Positive circulation can not be established to all heating units
C. The response to changes in heating load is slower
D. Smaller pipes may be used
E. Increased power and maintenance costs
D. Smaller pipes may be used
- An advantage of the forced circulation hot water heating system is:
A. Noisier operation
B. Positive circulation can be established to all heating units
C. The response to changes in heating load is slower
D. Larger pipes must be used
E. Increased power and maintenance costs
B. Positive circulation can be established to all heating units
- Compared to a steam heating system, which of the following is a advantage of a hot water heating system?
A. In a multi-story building the boiler must be designed to withstand high pressure due to the high head of water in the system
B. In a large hot water system, considerable power is required to circulate the water
C. Hot water boilers are smaller and more compact
D. There is a greater danger of damage due to freezing in a hot water system
E. If a leak does occur, more damage will result with a hot water system than with a steam system
C. Hot water boilers are smaller and more compact
- Compared to a steam heating system, which of the following is a disadvantage of a hot water heating system?
A. The water temperature can be varied more readily in relation to the ambient temperature
B. There is a greater danger of damage due to freezing in a hot water system
C. Hot water boilers are smaller and more compact
D. The piping slope is not as critical as proper condensate drainage is not as important
E. Maintenance costs are usually less in a hot water system, due to the fact that traps are not required and also because there is less corrosion in the piping
B. There is a greater danger of damage due to freezing in a hot water system
- In the hot water heating system, the temperature difference from the boiler outlet through the system piping and back to the boiler return connection is usually:
A. 5°C (41°F)
B. 11°C (20°F)
C. 15°C (59°F)
D. 21°C (70°F)
E. 25°C (77°F)
B. 11°C (20°F)
- In the multi-zone hot water heating system, the heating units are:
A. Zoned with each zone equipped with its own circulating pump
B. All supplied with water at the same temperature and the return from each convector flows by the shortest and most direct route back to the boiler
C. All supplied with water at the same temperature and the return from each convector flows the long way around to return to the boiler
D. Supplied from the main and the return from each convector is connected back to the main again downstream from the supply connection
E. Connected in series so the water circulates from the hot water supply main directly through all the convectors to the return mainz
A. Zoned with each zone equipped with its own circulating pump
- In the series loop hot water heating system, the heating units are:
A. Supplied from the main and the return from each convector is connected back to the main again downstream from the supply connection
B. Connected in series so the water circulates from the hot water supply main directly through all the convectors to the return main
C. All supplied with water at the same temperature and the return from each convector flows the long way around to return to the boiler
D. Equipped with its own circulating pump
E. All supplied with water at the same temperature and the return from each convector flows by the shortest and most direct route back to the boiler
B. Connected in series so the water circulates from the hot water supply main directly through all the convectors to the return main
- Temperatures used in radiant panel heating in walls should not exceed:
A. 52°C (126°F)
B. 30°C (86°F)
C. 25°C (77°F)
D. 30°C (86°F)
E. 38°C (100°F)
E. 38°C (100°F)
- The temperature for radiant panel heating in floors should be kept below:
A. 30°C
B. 25°C
C. 20°C
D. 15°C
E. 10°C
A. 30°C
- The gravity hot water heating system had a disadvantage of:
A. Simple operation and low maintenance
B. Positive circulation to radiators on the same level as the boiler
C. There is a quick response to changes in heat demand
D. The minimum water temperature is limited to 77°C (171°F)
E. Large pipe sizes to keep flow resistance to a minimum
E. Large pipe sizes to keep flow resistance to a minimum
- The heating coils in a snow melting system should be embedded at least _____ below the concrete surface.
A. 2 cm (0.8 in)
B. 10 cm (4 in)
C. 5 cm (2 in)
D. 7.5 cm (3 in)
E. 1 cm (0.4 in)
C. 5 cm (2 in)
- The water pressure in most a hot water heating system is in between:
A. 85 kPa to 140 kPa (12.3 psi to 20.3 psi)
B. 75 kPa to 110 kPa (10.9 psi to 16 psi)
C. 250 kPa to 300 kPa (36.3 psi to 43.5 psi)
D. 100 kPa to 150 kPa (14.5 psi to 21.8 psi)
E. 70 kPa to 94 kPa (10.2 psi to 13.6 psi)
A. 85 kPa to 140 kPa (12.3 psi to 20.3 psi)
- The gravity hot water heating system had a disadvantage of:
A. Small pipe sizes to keep flow resistance to a minimum
B. Positive circulation to radiators on the same level as the boiler
C. There is a quick response to changes in heat demand
D. The maximum water temperature is limited to 77°C (171°F)
E. Simple operation and low maintenance
D. The maximum water temperature is limited to 77°C (171°F)
- The gravity hot water heating system had a disadvantage of:
A. Small pipe sizes to keep flow resistance to a minimum
B. Positive circulation to radiators on the same level as the boiler
C. There is a slow response to changes in heat demand
D. The minimum water temperature is limited to 77°C (171°F)
E. Simple operation and low maintenance
C. There is a slow response to changes in heat demand
- The water temperature in a hot water heating system may vary from:
A. 50°C to 100°C (122°F to 212°F)
B. 75°C to 110°C (167°F to 230°F)
C. 250°C to 300°C (482°F to 572°F)
D. 100°C to 150°C (212°F to 302°F)
E. 70°C to 94°C (158°F to 201°F)
E. 70°C to 94°C (158°F to 201°F)
