// Numbas version: finer_feedback_settings
{"name": "How many kiloWatt-hours does your boiler use each year?", "extensions": [], "custom_part_types": [], "resources": [], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "question_groups": [{"pickingStrategy": "all-ordered", "questions": [{"name": "How many kiloWatt-hours does your boiler use each year?", "tags": [], "metadata": {"description": "", "licence": "None specified"}, "statement": "<div class=\"TextLayer-container\">\n<ul></ul>\n<div class=\"endOfContent textLayer--absolute\">\n<p data-start=\"0\" data-end=\"57\">How many kilowatt-hours does your boiler use each year?</p>\n<p data-start=\"59\" data-end=\"67\">Given:</p>\n<ul data-start=\"68\" data-end=\"462\" data-is-last-node=\"\">\n<li data-start=\"68\" data-end=\"130\"><strong data-start=\"70\" data-end=\"101\">{operational_days_per_year}</strong> operational days in a year</li>\n<li data-start=\"131\" data-end=\"190\">Two boilers, each with a power of <strong data-start=\"167\" data-end=\"185\">{boiler_power}</strong>kW</li>\n<li data-start=\"191\" data-end=\"299\">One boiler runs at full power for <strong data-start=\"227\" data-end=\"248\">{hot_water_hours}</strong> hour(s) every day all year (supplying hot water)</li>\n<li data-start=\"300\" data-end=\"462\" data-is-last-node=\"\">Both boilers run at an average of <strong data-start=\"336\" data-end=\"364\">{average_power_percent}%</strong> power for an additional <strong data-start=\"389\" data-end=\"414\">{space_heating_hours}</strong> hours per day for half the year (space heating)</li>\n</ul>\n</div>\n</div>", "advice": "<p><strong><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\">Hot water Consumption</span></strong><br role=\"presentation\" class=\"textLayer--absolute\"/><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\">&bull;</span><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\"> {boiler_power}</span><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\">kW x {hot_water_hours}hr x {operational_days_per_year}days = {hot_water_consumption}kWh</span><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\">&nbsp;</span><br role=\"presentation\" class=\"textLayer--absolute\"/><strong><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\">Space Heating Consumption</span></strong><br role=\"presentation\" class=\"textLayer--absolute\"/><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\">&bull;</span><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\"> {boiler_power*2}</span><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\">kW x {average_power_percent}% x {space_heating_hours}hrs x {operational_days_per_year/2}days = {space_heating_consumption}kWh</span><br role=\"presentation\" class=\"textLayer--absolute\"/><strong><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\">Total Energy Consumption</span></strong><br role=\"presentation\" class=\"textLayer--absolute\"/><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\">&bull;</span><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\"> </span><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\">{hot_water_consumption}kWh + {space_heating_consumption}kWh = {total_energy_consumption}kWh = {dec(total_energy_consumption/1000)}Mwh</span></p>", "rulesets": {}, "extensions": [], "builtin_constants": {"e": true, "pi,\u03c0": true, "i": true, "j": false}, "constants": [], "variables": {"operational_days_per_year": {"name": "operational_days_per_year", "group": "Ungrouped variables", "definition": "random(200 .. 300#10)", "description": "<p>The number of days the boilers are operational during the year.&nbsp;</p>", "templateType": "randrange", "can_override": false}, "boiler_power": {"name": "boiler_power", "group": "Ungrouped variables", "definition": "random(100 .. 300#50)", "description": "<p>The power of each boiler in kilowatts.&nbsp;</p>", "templateType": "randrange", "can_override": true}, "hot_water_hours": {"name": "hot_water_hours", "group": "Ungrouped variables", "definition": "random(1 .. 3#1)", "description": "<p>The hours per day one boiler runs at full power to supply hot water.&nbsp;</p>", "templateType": "randrange", "can_override": false}, "space_heating_hours": {"name": "space_heating_hours", "group": "Ungrouped variables", "definition": "random(5 .. 9#1)", "description": "<p style=\"text-align: left;\">The hours per day both boilers run to supply space heating.&nbsp;</p>", "templateType": "randrange", "can_override": false}, "average_power_percent": {"name": "average_power_percent", "group": "Ungrouped variables", "definition": "random(50 .. 80#5)", "description": "<p>The average power both boilers run at to supply space heating.&nbsp;</p>", "templateType": "randrange", "can_override": false}, "hot_water_consumption": {"name": "hot_water_consumption", "group": "Ungrouped variables", "definition": "boiler_power*hot_water_hours*operational_days_per_year", "description": "<p>Variable to store the answer for hot water consumption during the period in kWh.&nbsp;</p>", "templateType": "anything", "can_override": false}, "space_heating_consumption": {"name": "space_heating_consumption", "group": "Ungrouped variables", "definition": "boiler_power*2*(average_power_percent/100)*space_heating_hours*(operational_days_per_year/2)", "description": "<p>Variable to store the answer for space heating consumption during half of the operational period in kWh.&nbsp;</p>", "templateType": "anything", "can_override": false}, "total_energy_consumption": {"name": "total_energy_consumption", "group": "Ungrouped variables", "definition": "hot_water_consumption+space_heating_consumption", "description": "<p>Variable to store the answer for the total energy consumption over the period in kWh.&nbsp;</p>", "templateType": "anything", "can_override": false}}, "variablesTest": {"condition": "", "maxRuns": 100}, "ungrouped_variables": ["operational_days_per_year", "boiler_power", "hot_water_hours", "space_heating_hours", "average_power_percent", "hot_water_consumption", "space_heating_consumption", "total_energy_consumption"], "variable_groups": [], "functions": {}, "preamble": {"js": "", "css": ""}, "parts": [{"type": "numberentry", "useCustomName": false, "customName": "", "marks": 1, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p>Calculate the hot water energy consumption during the period in kWh.&nbsp;</p>", "minValue": "hot_water_consumption", "maxValue": "hot_water_consumption", "correctAnswerFraction": false, 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